int find_pourpts(void)
{
int row, col;
double easting, northing, stream_length;
CELL old_elev, basin_num, no_basin, curr_basin;
WAT_ALT wa;
ASP_FLAG af;
char is_swale;
ocs_alloced = 2 * bas_thres;
ocs = (OC_STACK *)G_malloc(ocs_alloced * sizeof(OC_STACK));
basin_num = 0;
Rast_set_c_null_value(&no_basin, 1);
stream_length = old_elev = 0;
for (row = 0; row < nrows; row++) {
G_percent(row, nrows, 1);
northing = window.north - (row + .5) * window.ns_res;
for (col = 0; col < ncols; col++) {
seg_get(&aspflag, (char *)&af, row, col);
cseg_get(&bas, &curr_basin, row, col);
if (curr_basin == 0)
cseg_put(&bas, &no_basin, row, col);
cseg_get(&haf, &curr_basin, row, col);
if (curr_basin == 0)
cseg_put(&haf, &no_basin, row, col);
is_swale = FLAG_GET(af.flag, SWALEFLAG);
if (af.asp <= 0 && is_swale > 0) {
basin_num += 2;
if (arm_flag) {
easting = window.west + (col + .5) * window.ew_res;
fprintf(fp, "%5d drains into %5d at %3d %3d %.3f %.3f",
(int)basin_num, 0, row, col, easting, northing);
if (col == 0 || col == ncols - 1) {
stream_length = .5 * window.ew_res;
}
else if (row == 0 || row == nrows - 1) {
stream_length = .5 * window.ns_res;
}
else {
stream_length = 0.0;
}
seg_get(&watalt, (char *) &wa, row, col);
old_elev = wa.ele;
}
basin_num =
def_basin(row, col, basin_num, stream_length, old_elev);
}
}
}
G_percent(nrows, nrows, 1); /* finish it */
n_basins = basin_num;
G_free(ocs);
return 0;
}
XE_StartIO ( struct XE_Interface_Structure * XE_Int)
{
signed long I,
RC;
struct XERCV_QB_structure * Buff;
struct xe_arp_structure * ARbuf;
struct XERCV_structure * rcvhdrs = XE_Int->XEI$rcvhdrs ;
short XE_chan = XE_Int->xei$io_chan;
short XAR_chan = XE_Int->xei$arp_io_chan;
// Supply four receive buffers to device controller
DRV$OPR_FAO ("XEDRV: MPBS = !SL",DRV$MAX_PHYSICAL_BUFSIZE);
XE_Int->XEI$curhdr = 0;
for (I=0;I<=(MAX_RCV_BUF-1);I++)
{ // Get buffer, put on Q and issue IO$_READVBLK function
Buff = drv$seg_get(DRV$MAX_PHYSICAL_BUFSIZE+(Qhead_len+IOS_len));
INSQUE ( Buff , XE_Int-> XEI$recv_Qtail );
Buff = Buff + XE_hdr_offset;
RC = sys$qio(ASTEFN,XE_chan,IO$_READVBLK,&Buff->XERCV$vms_code,
XE_receive, XE_Int,
&Buff->XERCV$data,
DRV$MAX_PHYSICAL_BUFSIZE,
0, 0,
rcvhdrs[I].XERCV$buf,0);
if (RC != SS$_NORMAL)
{ // Error issuing set receive buffer command
XE$ERR(XE_Int,"XE queue read request failure, RC=!XL",RC);
return 0;
}
};
// get ARP buffer and issue a receive qio
ARbuf = drv$seg_get(XE_ARP_LEN);
XE_Int-> xei$arp_buffer = ARbuf;
RC = sys$qio( ARPEFN, XE_Int-> xei$arp_io_chan ,
IO$_READVBLK,
&ARbuf -> ar_ios0 ,
xe_arprcv, XE_Int,
ARbuf->ar_data, ARP_MAX_LEN, 0, 0,
ARbuf->phys$1, 0);
if (RC != SS$_NORMAL)
{
XE$ERR(XE_Int,"XE ARP queued read failure, RC=!XL",RC);
return 0;
};
// Indicate that I/O has been started
XE_Int->XEI$IO_queued = TRUE;
return -1;
}
int slope_length(int r, int c, int dr, int dc)
{
CELL top_alt, bot_alt, ridge;
char asp_value;
double res, top_ls, bot_ls;
WAT_ALT wa;
if (sides == 8) {
if (r == dr)
res = window.ns_res;
else if (c == dc)
res = window.ew_res;
else
res = diag;
}
else { /* sides == 4 */
bseg_get(&asp, &asp_value, dr, dc);
if (r == dr) {
if (asp_value == 2 || asp_value == 6)
res = window.ns_res;
else /* asp_value == 4, 8, -2, -4, -6, or -8 */
res = diag; /* how can res be diag with sides == 4??? */
}
else { /* c == dc */
if (asp_value == 4 || asp_value == 8)
res = window.ew_res;
else /* asp_value == 2, 6, -2, -4, -6, or -8 */
res = diag;
}
}
dseg_get(&s_l, &top_ls, r, c);
if (top_ls == half_res)
top_ls = res;
else
top_ls += res;
dseg_put(&s_l, &top_ls, r, c);
seg_get(&watalt, (char *) &wa, r, c);
top_alt = wa.ele;
seg_get(&watalt, (char *) &wa, dr, dc);
bot_alt = wa.ele;
if (top_alt > bot_alt) {
dseg_get(&s_l, &bot_ls, dr, dc);
if (top_ls > bot_ls) {
bot_ls = top_ls + res;
dseg_put(&s_l, &bot_ls, dr, dc);
cseg_get(&r_h, &ridge, r, c);
cseg_put(&r_h, &ridge, dr, dc);
}
}
return 0;
}
/*
* drop item from heap
* returns heap size
*/
HEAP_PNT heap_drop(void)
{
GW_LARGE_INT child, childr, parent;
GW_LARGE_INT i;
HEAP_PNT child_p, childr_p, last_p, root_p;
seg_get(&search_heap, (char *)&last_p, 0, heap_size);
seg_get(&search_heap, (char *)&root_p, 0, 1);
if (heap_size == 1) {
heap_size = 0;
return root_p;
}
parent = 1;
while ((child = GET_CHILD(parent)) < heap_size) {
seg_get(&search_heap, (char *)&child_p, 0, child);
if (child < heap_size) {
childr = child + 1;
i = child + 8;
while (childr < heap_size && childr < i) {
seg_get(&search_heap, (char *)&childr_p, 0, childr);
if (heap_cmp(&childr_p, &child_p)) {
child = childr;
child_p = childr_p;
}
childr++;
}
}
if (heap_cmp(&last_p, &child_p)) {
break;
}
/* move hole down */
seg_put(&search_heap, (char *)&child_p, 0, parent);
parent = child;
}
/* fill hole */
if (parent < heap_size) {
seg_put(&search_heap, (char *)&last_p, 0, parent);
}
/* the actual drop */
heap_size--;
return root_p;
}
static int sift_up(GW_LARGE_INT start, HEAP_PNT child_p)
{
GW_LARGE_INT parent, child;
HEAP_PNT heap_p;
child = start;
while (child > 1) {
parent = GET_PARENT(child);
seg_get(&search_heap, (char *)&heap_p, 0, parent);
/* push parent point down if child is smaller */
if (heap_cmp(&child_p, &heap_p)) {
seg_put(&search_heap, (char *)&heap_p, 0, child);
child = parent;
}
else
/* no more sifting up, found slot for child */
break;
}
/* add child to heap */
seg_put(&search_heap, (char *)&child_p, 0, child);
return 0;
}
/* drop point routine for min heap */
HEAP_PNT drop_pt(void)
{
int child, childr, parent;
int i;
HEAP_PNT child_p, childr_p, last_p, root_p;
seg_get(&search_heap, (char *)&last_p, 0, heap_size);
seg_get(&search_heap, (char *)&root_p, 0, 1);
/* sift down: move hole back towards bottom of heap */
parent = 1;
while ((child = GET_CHILD(parent)) < heap_size) {
/* select child with lower ele, if both are equal, older child
* older child is older startpoint for flow path, important */
seg_get(&search_heap, (char *)&child_p, 0, child);
if (child < heap_size) {
childr = child + 1;
i = child + 4;
while (childr < i && childr < heap_size) {
seg_get(&search_heap, (char *)&childr_p, 0, childr);
if (cmp_pnt(&childr_p, &child_p)) {
child = childr;
child_p = childr_p;
}
childr++;
}
}
if (cmp_pnt(&last_p, &child_p)) {
break;
}
/* move hole down */
seg_put(&search_heap, (char *)&child_p, 0, parent);
parent = child;
}
seg_put(&search_heap, (char *)&last_p, 0, parent);
/* the actual drop */
heap_size--;
return root_p;
}
int sg_factor(void)
{
int r, c;
CELL low_elev, hih_elev;
double height, length, S, sin_theta;
WAT_ALT wa;
ASP_FLAG af;
G_message(_("SECTION 5: RUSLE LS and/or S factor determination."));
for (r = nrows - 1; r >= 0; r--) {
G_percent(nrows - r, nrows, 3);
for (c = ncols - 1; c >= 0; c--) {
seg_get(&aspflag, (char *)&af, r, c);
if (FLAG_GET(af.flag, NULLFLAG))
continue;
seg_get(&watalt, (char *) &wa, r, c);
low_elev = wa.ele;
cseg_get(&r_h, &hih_elev, r, c);
dseg_get(&s_l, &length, r, c);
height = 1.0 * (hih_elev - low_elev) / ele_scale;
if (length > max_length) {
height *= max_length / length;
length = max_length;
}
sin_theta = height / sqrt(height * height + length * length);
if (height / length < .09)
S = 10.8 * sin_theta + .03;
else
S = 16.8 * sin_theta - .50;
if (ls_flag) {
length *= METER_TO_FOOT;
len_slp_equ(length, sin_theta, S, r, c);
}
if (sg_flag) {
dseg_put(&s_g, &S, r, c);
}
}
}
G_percent(nrows, nrows, 1); /* finish it */
return 0;
}
int close_streamvect(char *stream_vect)
{
int r, c, r_nbr, c_nbr, done;
GW_LARGE_INT i;
CELL stream_id, stream_nbr;
ASP_FLAG af;
int next_node;
struct sstack
{
int stream_id;
int next_trib;
} *nodestack;
int top = 0, stack_step = 1000;
int asp_r[9] = { 0, -1, -1, -1, 0, 1, 1, 1, 0 };
int asp_c[9] = { 0, 1, 0, -1, -1, -1, 0, 1, 1 };
struct Map_info Out;
static struct line_pnts *Points;
struct line_cats *Cats;
dbDriver *driver;
dbHandle handle;
dbString table_name, dbsql, valstr;
struct field_info *Fi;
char *cat_col_name = "cat", buf[2000];
struct Cell_head window;
double north_offset, west_offset, ns_res, ew_res;
int next_cat;
G_message(_("Writing vector map <%s>..."), stream_vect);
if (Vect_open_new(&Out, stream_vect, 0) < 0)
G_fatal_error(_("Unable to create vector map <%s>"), stream_vect);
nodestack = (struct sstack *)G_malloc(stack_step * sizeof(struct sstack));
Points = Vect_new_line_struct();
Cats = Vect_new_cats_struct();
G_get_set_window(&window);
ns_res = window.ns_res;
ew_res = window.ew_res;
north_offset = window.north - 0.5 * ns_res;
west_offset = window.west + 0.5 * ew_res;
next_cat = n_stream_nodes + 1;
for (i = 0; i < n_outlets; i++, next_cat++) {
G_percent(i, n_outlets, 2);
r = outlets[i].r;
c = outlets[i].c;
cseg_get(&stream, &stream_id, r, c);
if (!stream_id)
continue;
Vect_reset_line(Points);
Vect_reset_cats(Cats);
/* outlet */
Vect_cat_set(Cats, 1, stream_id);
Vect_cat_set(Cats, 2, 2);
Vect_append_point(Points, west_offset + c * ew_res,
north_offset - r * ns_res, 0);
Vect_write_line(&Out, GV_POINT, Points, Cats);
/* add root node to stack */
G_debug(3, "add root node");
top = 0;
nodestack[top].stream_id = stream_id;
nodestack[top].next_trib = 0;
/* depth first post order traversal */
G_debug(3, "traverse");
while (top >= 0) {
done = 1;
stream_id = nodestack[top].stream_id;
G_debug(3, "stream_id %d", stream_id);
if (nodestack[top].next_trib < stream_node[stream_id].n_trib) {
/* add to stack */
next_node =
stream_node[stream_id].trib[nodestack[top].next_trib];
G_debug(3, "add to stack: next %d, trib %d, n trib %d",
next_node, nodestack[top].next_trib,
stream_node[stream_id].n_trib);
nodestack[top].next_trib++;
top++;
if (top >= stack_step) {
/* need more space */
stack_step += 1000;
nodestack =
(struct sstack *)G_realloc(nodestack,
stack_step *
sizeof(struct sstack));
}
nodestack[top].next_trib = 0;
nodestack[top].stream_id = next_node;
done = 0;
G_debug(3, "go further down");
}
if (done) {
G_debug(3, "write stream segment");
Vect_reset_line(Points);
Vect_reset_cats(Cats);
r_nbr = stream_node[stream_id].r;
c_nbr = stream_node[stream_id].c;
cseg_get(&stream, &stream_nbr, r_nbr, c_nbr);
if (stream_nbr <= 0)
G_fatal_error(_("Stream id %d not set, top is %d, parent is %d"),
stream_id, top, nodestack[top - 1].stream_id);
Vect_cat_set(Cats, 1, stream_id);
if (stream_node[stream_id].n_trib == 0)
Vect_cat_set(Cats, 2, 0);
else
Vect_cat_set(Cats, 2, 1);
Vect_append_point(Points, west_offset + c_nbr * ew_res,
north_offset - r_nbr * ns_res, 0);
Vect_write_line(&Out, GV_POINT, Points, Cats);
seg_get(&aspflag, (char *)&af, r_nbr, c_nbr);
while (af.asp > 0) {
r_nbr = r_nbr + asp_r[(int)af.asp];
c_nbr = c_nbr + asp_c[(int)af.asp];
cseg_get(&stream, &stream_nbr, r_nbr, c_nbr);
if (stream_nbr <= 0)
G_fatal_error(_("Stream id not set while tracing"));
Vect_append_point(Points, west_offset + c_nbr * ew_res,
north_offset - r_nbr * ns_res, 0);
if (stream_nbr != stream_id) {
/* first point of parent stream */
break;
}
seg_get(&aspflag, (char *)&af, r_nbr, c_nbr);
}
Vect_write_line(&Out, GV_LINE, Points, Cats);
top--;
}
}
}
G_percent(n_outlets, n_outlets, 1); /* finish it */
G_message(_("Writing attribute data..."));
/* Prepeare strings for use in db_* calls */
db_init_string(&dbsql);
db_init_string(&valstr);
db_init_string(&table_name);
db_init_handle(&handle);
/* Preparing database for use */
/* Create database for new vector map */
Fi = Vect_default_field_info(&Out, 1, NULL, GV_1TABLE);
driver = db_start_driver_open_database(Fi->driver,
Vect_subst_var(Fi->database,
&Out));
if (driver == NULL) {
G_fatal_error(_("Unable to start driver <%s>"), Fi->driver);
}
db_set_error_handler_driver(driver);
G_debug(1, "table: %s", Fi->table);
G_debug(1, "driver: %s", Fi->driver);
G_debug(1, "database: %s", Fi->database);
sprintf(buf,
"create table %s (%s integer, stream_type varchar(20), type_code integer)",
Fi->table, cat_col_name);
db_set_string(&dbsql, buf);
if (db_execute_immediate(driver, &dbsql) != DB_OK) {
db_close_database(driver);
db_shutdown_driver(driver);
G_fatal_error(_("Unable to create table: '%s'"), db_get_string(&dbsql));
}
if (db_create_index2(driver, Fi->table, cat_col_name) != DB_OK)
G_warning(_("Unable to create index on table <%s>"), Fi->table);
if (db_grant_on_table(driver, Fi->table, DB_PRIV_SELECT,
DB_GROUP | DB_PUBLIC) != DB_OK)
G_fatal_error(_("Unable to grant privileges on table <%s>"), Fi->table);
db_begin_transaction(driver);
/* stream nodes */
for (i = 1; i <= n_stream_nodes; i++) {
sprintf(buf, "insert into %s values ( %lld, \'%s\', %d )",
Fi->table, i,
(stream_node[i].n_trib > 0 ? "intermediate" : "start"),
(stream_node[i].n_trib > 0));
db_set_string(&dbsql, buf);
if (db_execute_immediate(driver, &dbsql) != DB_OK) {
db_close_database(driver);
db_shutdown_driver(driver);
G_fatal_error(_("Unable to insert new row: '%s'"),
db_get_string(&dbsql));
}
}
db_commit_transaction(driver);
db_close_database_shutdown_driver(driver);
Vect_map_add_dblink(&Out, 1, NULL, Fi->table,
cat_col_name, Fi->database, Fi->driver);
G_debug(1, "close vector");
Vect_hist_command(&Out);
Vect_build(&Out);
Vect_close(&Out);
G_free(nodestack);
return 1;
}
int close_maps(char *stream_rast, char *stream_vect, char *dir_rast)
{
int stream_fd, dir_fd, r, c, i;
CELL *cell_buf1, *cell_buf2;
struct History history;
CELL stream_id;
ASP_FLAG af;
/* cheating... */
stream_fd = dir_fd = -1;
cell_buf1 = cell_buf2 = NULL;
G_message(_("Writing output raster maps..."));
/* write requested output rasters */
if (stream_rast) {
stream_fd = Rast_open_new(stream_rast, CELL_TYPE);
cell_buf1 = Rast_allocate_c_buf();
}
if (dir_rast) {
dir_fd = Rast_open_new(dir_rast, CELL_TYPE);
cell_buf2 = Rast_allocate_c_buf();
}
for (r = 0; r < nrows; r++) {
G_percent(r, nrows, 2);
if (stream_rast)
Rast_set_c_null_value(cell_buf1, ncols); /* reset row to all NULL */
if (dir_rast)
Rast_set_c_null_value(cell_buf2, ncols); /* reset row to all NULL */
for (c = 0; c < ncols; c++) {
if (stream_rast) {
cseg_get(&stream, &stream_id, r, c);
if (stream_id)
cell_buf1[c] = stream_id;
}
if (dir_rast) {
seg_get(&aspflag, (char *)&af, r, c);
if (!FLAG_GET(af.flag, NULLFLAG)) {
cell_buf2[c] = af.asp;
}
}
}
if (stream_rast)
Rast_put_row(stream_fd, cell_buf1, CELL_TYPE);
if (dir_rast)
Rast_put_row(dir_fd, cell_buf2, CELL_TYPE);
}
G_percent(nrows, nrows, 2); /* finish it */
if (stream_rast) {
Rast_close(stream_fd);
G_free(cell_buf1);
Rast_short_history(stream_rast, "raster", &history);
Rast_command_history(&history);
Rast_write_history(stream_rast, &history);
}
if (dir_rast) {
struct Colors colors;
Rast_close(dir_fd);
G_free(cell_buf2);
Rast_short_history(dir_rast, "raster", &history);
Rast_command_history(&history);
Rast_write_history(dir_rast, &history);
Rast_init_colors(&colors);
Rast_make_aspect_colors(&colors, -8, 8);
Rast_write_colors(dir_rast, G_mapset(), &colors);
}
/* close stream vector */
if (stream_vect) {
if (close_streamvect(stream_vect) < 0)
G_fatal_error(_("Unable to write vector map <%s>"), stream_vect);
}
/* rearranging desk chairs on the Titanic... */
G_free(outlets);
/* free stream nodes */
for (i = 1; i <= n_stream_nodes; i++) {
if (stream_node[i].n_alloc > 0) {
G_free(stream_node[i].trib);
}
}
G_free(stream_node);
return 1;
}
int init_search(int depr_fd)
{
int r, c, r_nbr, c_nbr, ct_dir;
CELL *depr_buf, ele_value;
int nextdr[8] = { 1, -1, 0, 0, -1, 1, 1, -1 };
int nextdc[8] = { 0, 0, -1, 1, 1, -1, 1, -1 };
char asp_value, is_null;
WAT_ALT wa;
ASP_FLAG af, af_nbr;
GW_LARGE_INT n_depr_cells = 0;
nxt_avail_pt = heap_size = 0;
/* load edge cells and real depressions to A* heap */
if (depr_fd >= 0)
depr_buf = Rast_allocate_buf(CELL_TYPE);
else
depr_buf = NULL;
G_message(_("Initializing A* search..."));
for (r = 0; r < nrows; r++) {
G_percent(r, nrows, 2);
if (depr_fd >= 0) {
Rast_get_row(depr_fd, depr_buf, r, CELL_TYPE);
}
for (c = 0; c < ncols; c++) {
seg_get(&aspflag, (char *)&af, r, c);
is_null = FLAG_GET(af.flag, NULLFLAG);
if (is_null)
continue;
asp_value = 0;
if (r == 0 || r == nrows - 1 || c == 0 || c == ncols - 1) {
if (r == 0 && c == 0)
asp_value = -7;
else if (r == 0 && c == ncols - 1)
asp_value = -5;
else if (r == nrows - 1 && c == 0)
asp_value = -1;
else if (r == nrows - 1 && c == ncols - 1)
asp_value = -3;
else if (r == 0)
asp_value = -2;
else if (c == 0)
asp_value = -4;
else if (r == nrows - 1)
asp_value = -6;
else if (c == ncols - 1)
asp_value = -8;
seg_get(&watalt, (char *)&wa, r, c);
ele_value = wa.ele;
heap_add(r, c, ele_value);
FLAG_SET(af.flag, INLISTFLAG);
FLAG_SET(af.flag, EDGEFLAG);
af.asp = asp_value;
seg_put(&aspflag, (char *)&af, r, c);
continue;
}
/* any neighbour NULL ? */
for (ct_dir = 0; ct_dir < sides; ct_dir++) {
/* get r, c (r_nbr, c_nbr) for neighbours */
r_nbr = r + nextdr[ct_dir];
c_nbr = c + nextdc[ct_dir];
seg_get(&aspflag, (char *)&af_nbr, r_nbr, c_nbr);
is_null = FLAG_GET(af_nbr.flag, NULLFLAG);
if (is_null) {
asp_value = -1 * drain[r - r_nbr + 1][c - c_nbr + 1];
seg_get(&watalt, (char *)&wa, r, c);
ele_value = wa.ele;
heap_add(r, c, ele_value);
FLAG_SET(af.flag, INLISTFLAG);
FLAG_SET(af.flag, EDGEFLAG);
af.asp = asp_value;
seg_put(&aspflag, (char *)&af, r, c);
break;
}
}
if (asp_value) /* some neighbour was NULL, point added to list */
continue;
/* real depression ? */
if (depr_fd >= 0) {
if (!Rast_is_c_null_value(&depr_buf[c]) && depr_buf[c] != 0) {
seg_get(&watalt, (char *)&wa, r, c);
ele_value = wa.ele;
heap_add(r, c, ele_value);
FLAG_SET(af.flag, INLISTFLAG);
FLAG_SET(af.flag, DEPRFLAG);
af.asp = asp_value;
seg_put(&aspflag, (char *)&af, r, c);
n_depr_cells++;
}
}
}
}
G_percent(nrows, nrows, 2); /* finish it */
if (depr_fd >= 0) {
Rast_close(depr_fd);
G_free(depr_buf);
}
G_debug(1, "%lld edge cells", heap_size - n_depr_cells);
if (n_depr_cells)
G_debug(1, "%lld cells in depressions", n_depr_cells);
return 1;
}
int do_astar(void)
{
int r, c, r_nbr, c_nbr, ct_dir;
GW_LARGE_INT first_cum, count;
int nextdr[8] = { 1, -1, 0, 0, -1, 1, 1, -1 };
int nextdc[8] = { 0, 0, -1, 1, 1, -1, 1, -1 };
CELL ele_val, ele_up, ele_nbr[8];
WAT_ALT wa;
ASP_FLAG af;
char is_in_list, is_worked;
HEAP_PNT heap_p;
/* sides
* |7|1|4|
* |2| |3|
* |5|0|6|
*/
int nbr_ew[8] = { 0, 1, 2, 3, 1, 0, 0, 1 };
int nbr_ns[8] = { 0, 1, 2, 3, 3, 2, 3, 2 };
double dx, dy, dist_to_nbr[8], ew_res, ns_res;
double slope[8];
struct Cell_head window;
int skip_diag;
count = 0;
first_cum = n_points;
G_message(_("A* Search..."));
Rast_get_window(&window);
for (ct_dir = 0; ct_dir < sides; ct_dir++) {
/* get r, c (r_nbr, c_nbr) for neighbours */
r_nbr = nextdr[ct_dir];
c_nbr = nextdc[ct_dir];
/* account for rare cases when ns_res != ew_res */
dy = abs(r_nbr) * window.ns_res;
dx = abs(c_nbr) * window.ew_res;
if (ct_dir < 4)
dist_to_nbr[ct_dir] = dx + dy;
else
dist_to_nbr[ct_dir] = sqrt(dx * dx + dy * dy);
}
ew_res = window.ew_res;
ns_res = window.ns_res;
while (heap_size > 0) {
G_percent(count++, n_points, 1);
if (count > n_points)
G_fatal_error(_("%lld surplus points"),
heap_size);
if (heap_size > n_points)
G_fatal_error
(_("Too many points in heap %lld, should be %lld"),
heap_size, n_points);
heap_p = heap_drop();
r = heap_p.pnt.r;
c = heap_p.pnt.c;
ele_val = heap_p.ele;
for (ct_dir = 0; ct_dir < sides; ct_dir++) {
/* get r, c (r_nbr, c_nbr) for neighbours */
r_nbr = r + nextdr[ct_dir];
c_nbr = c + nextdc[ct_dir];
slope[ct_dir] = ele_nbr[ct_dir] = 0;
skip_diag = 0;
/* check that neighbour is within region */
if (r_nbr < 0 || r_nbr >= nrows || c_nbr < 0 || c_nbr >= ncols)
continue;
seg_get(&aspflag, (char *)&af, r_nbr, c_nbr);
is_in_list = FLAG_GET(af.flag, INLISTFLAG);
is_worked = FLAG_GET(af.flag, WORKEDFLAG);
if (!is_worked) {
seg_get(&watalt, (char *)&wa, r_nbr, c_nbr);
ele_nbr[ct_dir] = wa.ele;
slope[ct_dir] = get_slope(ele_val, ele_nbr[ct_dir],
dist_to_nbr[ct_dir]);
}
/* avoid diagonal flow direction bias */
if (!is_in_list) {
if (ct_dir > 3 && slope[ct_dir] > 0) {
if (slope[nbr_ew[ct_dir]] > 0) {
/* slope to ew nbr > slope to center */
if (slope[ct_dir] <
get_slope(ele_nbr[nbr_ew[ct_dir]],
ele_nbr[ct_dir], ew_res))
skip_diag = 1;
}
if (!skip_diag && slope[nbr_ns[ct_dir]] > 0) {
/* slope to ns nbr > slope to center */
if (slope[ct_dir] <
get_slope(ele_nbr[nbr_ns[ct_dir]],
ele_nbr[ct_dir], ns_res))
skip_diag = 1;
}
}
}
if (!skip_diag) {
if (is_in_list == 0) {
ele_up = ele_nbr[ct_dir];
af.asp = drain[r_nbr - r + 1][c_nbr - c + 1];
heap_add(r_nbr, c_nbr, ele_up);
FLAG_SET(af.flag, INLISTFLAG);
seg_put(&aspflag, (char *)&af, r_nbr, c_nbr);
}
else if (is_in_list && is_worked == 0) {
if (FLAG_GET(af.flag, EDGEFLAG)) {
/* neighbour is edge in list, not yet worked */
if (af.asp < 0) {
/* adjust flow direction for edge cell */
af.asp = drain[r_nbr - r + 1][c_nbr - c + 1];
seg_put(&aspflag, (char *)&af, r_nbr, c_nbr);
}
}
else if (FLAG_GET(af.flag, DEPRFLAG)) {
G_debug(3, "real depression");
/* neighbour is inside real depression, not yet worked */
if (af.asp == 0 && ele_val <= ele_nbr[ct_dir]) {
af.asp = drain[r_nbr - r + 1][c_nbr - c + 1];
FLAG_UNSET(af.flag, DEPRFLAG);
seg_put(&aspflag, (char *)&af, r_nbr, c_nbr);
}
}
}
}
} /* end neighbours */
/* add astar points to sorted list for flow accumulation and stream extraction */
first_cum--;
seg_put(&astar_pts, (char *)&heap_p.pnt, 0, first_cum);
seg_get(&aspflag, (char *)&af, r, c);
FLAG_SET(af.flag, WORKEDFLAG);
seg_put(&aspflag, (char *)&af, r, c);
} /* end A* search */
G_percent(n_points, n_points, 1); /* finish it */
return 1;
}
int init_vars(int argc, char *argv[])
{
int r, c;
int ele_fd, wat_fd, fd = -1;
int seg_rows, seg_cols, num_cseg_total, num_open_segs, num_open_array_segs;
double memory_divisor, heap_mem, seg_factor, disk_space;
/* int page_block, num_cseg; */
int max_bytes;
CELL *buf, alt_value, *alt_value_buf, block_value;
char asp_value;
DCELL wat_value;
DCELL dvalue;
WAT_ALT wa, *wabuf;
ASP_FLAG af, af_nbr, *afbuf;
char MASK_flag;
void *elebuf, *ptr, *watbuf, *watptr;
int ele_map_type, wat_map_type;
size_t ele_size, wat_size;
int ct_dir, r_nbr, c_nbr;
G_gisinit(argv[0]);
/* input */
ele_flag = pit_flag = run_flag = ril_flag = 0;
/* output */
wat_flag = asp_flag = bas_flag = seg_flag = haf_flag = tci_flag = 0;
bas_thres = 0;
/* shed, unused */
arm_flag = dis_flag = 0;
/* RUSLE */
ob_flag = st_flag = sl_flag = sg_flag = ls_flag = er_flag = 0;
nxt_avail_pt = 0;
/* dep_flag = 0; */
max_length = d_zero = 0.0;
d_one = 1.0;
ril_value = -1.0;
/* dep_slope = 0.0; */
max_bytes = 0;
sides = 8;
mfd = 1;
c_fac = 5;
abs_acc = 0;
ele_scale = 1;
segs_mb = 300;
/* scan options */
for (r = 1; r < argc; r++) {
if (sscanf(argv[r], "elevation=%s", ele_name) == 1)
ele_flag++;
else if (sscanf(argv[r], "accumulation=%s", wat_name) == 1)
wat_flag++;
else if (sscanf(argv[r], "tci=%s", tci_name) == 1)
tci_flag++;
else if (sscanf(argv[r], "drainage=%s", asp_name) == 1)
asp_flag++;
else if (sscanf(argv[r], "depression=%s", pit_name) == 1)
pit_flag++;
else if (sscanf(argv[r], "threshold=%d", &bas_thres) == 1) ;
else if (sscanf(argv[r], "max_slope_length=%lf", &max_length) == 1) ;
else if (sscanf(argv[r], "basin=%s", bas_name) == 1)
bas_flag++;
else if (sscanf(argv[r], "stream=%s", seg_name) == 1)
seg_flag++;
else if (sscanf(argv[r], "half_basin=%s", haf_name) == 1)
haf_flag++;
else if (sscanf(argv[r], "flow=%s", run_name) == 1)
run_flag++;
else if (sscanf(argv[r], "ar=%s", arm_name) == 1)
arm_flag++;
/* slope length
else if (sscanf(argv[r], "slope_length=%s", sl_name) == 1)
sl_flag++; */
else if (sscanf(argv[r], "slope_steepness=%s", sg_name) == 1)
sg_flag++;
else if (sscanf(argv[r], "length_slope=%s", ls_name) == 1)
ls_flag++;
else if (sscanf(argv[r], "blocking=%s", ob_name) == 1)
ob_flag++;
else if (sscanf(argv[r], "memory=%lf", &segs_mb) == 1) ;
else if (sscanf(argv[r], "disturbed_land=%s", ril_name) == 1) {
if (sscanf(ril_name, "%lf", &ril_value) == 0) {
ril_value = -1.0;
ril_flag++;
}
}
/* slope deposition
else if (sscanf (argv[r], "sd=%[^\n]", dep_name) == 1) dep_flag++; */
else if (sscanf(argv[r], "-%d", &sides) == 1) {
if (sides != 4)
usage(argv[0]);
}
else if (sscanf(argv[r], "convergence=%d", &c_fac) == 1) ;
else if (strcmp(argv[r], "-s") == 0)
mfd = 0;
else if (strcmp(argv[r], "-a") == 0)
abs_acc = 1;
else
usage(argv[0]);
}
/* check options */
if (mfd == 1 && (c_fac < 1 || c_fac > 10)) {
G_fatal_error("Convergence factor must be between 1 and 10.");
}
if ((ele_flag != 1)
||
((arm_flag == 1) &&
((bas_thres <= 0) || ((haf_flag != 1) && (bas_flag != 1))))
||
((bas_thres <= 0) &&
((bas_flag == 1) || (seg_flag == 1) || (haf_flag == 1) ||
(sl_flag == 1) || (sg_flag == 1) || (ls_flag == 1)))
)
usage(argv[0]);
tot_parts = 4;
if (sl_flag || sg_flag || ls_flag)
er_flag = 1;
/* do RUSLE */
if (er_flag)
tot_parts++;
/* define basins */
if (seg_flag || bas_flag || haf_flag)
tot_parts++;
G_message(_n("SECTION 1 beginning: Initiating Variables. %d section total.",
"SECTION 1 beginning: Initiating Variables. %d sections total.",
tot_parts),
tot_parts);
this_mapset = G_mapset();
/* for sd factor
if (dep_flag) {
if (sscanf (dep_name, "%lf", &dep_slope) != 1) {
dep_flag = -1;
}
}
*/
G_get_set_window(&window);
nrows = Rast_window_rows();
ncols = Rast_window_cols();
if (max_length <= d_zero)
max_length = 10 * nrows * window.ns_res + 10 * ncols * window.ew_res;
if (window.ew_res < window.ns_res)
half_res = .5 * window.ew_res;
else
half_res = .5 * window.ns_res;
diag = sqrt(window.ew_res * window.ew_res +
window.ns_res * window.ns_res);
if (sides == 4)
diag *= 0.5;
/* Segment rows and cols: 64 */
seg_rows = SROW;
seg_cols = SCOL;
/* seg_factor * <size in bytes> = segment size in KB */
seg_factor = seg_rows * seg_rows / 1024.;
if (segs_mb < 3.0) {
segs_mb = 3;
G_warning(_("Maximum memory to be used was smaller than 3 MB,"
" set to 3 MB."));
}
/* balance segment files */
/* elevation + accumulation: * 2 */
memory_divisor = sizeof(WAT_ALT) * 2;
disk_space = sizeof(WAT_ALT);
/* aspect and flags: * 4 */
memory_divisor += sizeof(ASP_FLAG) * 4;
disk_space += sizeof(ASP_FLAG);
/* astar_points: / 16 */
/* ideally only a few but large segments */
memory_divisor += sizeof(POINT) / 16.;
disk_space += sizeof(POINT);
/* heap points: / 4 */
memory_divisor += sizeof(HEAP_PNT) / 4.;
disk_space += sizeof(HEAP_PNT);
/* TCI: as is */
if (tci_flag) {
memory_divisor += sizeof(double);
disk_space += sizeof(double);
}
/* RUSLE */
if (er_flag) {
/* r_h */
memory_divisor += 4;
disk_space += 4;
/* s_l */
memory_divisor += 8;
disk_space += 8;
/* s_g */
if (sg_flag) {
memory_divisor += 8;
disk_space += 8;
}
/* l_s */
if (ls_flag) {
memory_divisor += 8;
disk_space += 8;
}
/* ril */
if (ril_flag) {
memory_divisor += 8;
disk_space += 8;
}
}
/* KB -> MB */
memory_divisor = memory_divisor * seg_factor / 1024.;
disk_space = disk_space * seg_factor / 1024.;
num_open_segs = segs_mb / memory_divisor;
heap_mem = num_open_segs * seg_factor * sizeof(HEAP_PNT) / (4. * 1024.);
G_debug(1, "segs MB: %.0f", segs_mb);
G_debug(1, "region rows: %d", nrows);
G_debug(1, "seg rows: %d", seg_rows);
G_debug(1, "region cols: %d", ncols);
G_debug(1, "seg cols: %d", seg_cols);
num_cseg_total = nrows / SROW + 1;
G_debug(1, " row segments:\t%d", num_cseg_total);
num_cseg_total = ncols / SCOL + 1;
G_debug(1, "column segments:\t%d", num_cseg_total);
num_cseg_total = (ncols / seg_cols + 1) * (nrows / seg_rows + 1);
G_debug(1, " total segments:\t%d", num_cseg_total);
G_debug(1, " open segments:\t%d", num_open_segs);
/* nonsense to have more segments open than exist */
if (num_open_segs > num_cseg_total)
num_open_segs = num_cseg_total;
G_debug(1, " open segments after adjusting:\t%d", num_open_segs);
disk_space *= num_cseg_total;
if (disk_space < 1024.0)
G_verbose_message(_("Will need up to %.2f MB of disk space"), disk_space);
else
G_verbose_message(_("Will need up to %.2f GB (%.0f MB) of disk space"),
disk_space / 1024.0, disk_space);
if (er_flag) {
cseg_open(&r_h, seg_rows, seg_cols, num_open_segs);
cseg_read_cell(&r_h, ele_name, "");
}
/* read elevation input and mark NULL/masked cells */
/* scattered access: alt, watalt, bitflags, asp */
seg_open(&watalt, nrows, ncols, seg_rows, seg_cols, num_open_segs * 2, sizeof(WAT_ALT));
seg_open(&aspflag, nrows, ncols, seg_rows, seg_cols, num_open_segs * 4, sizeof(ASP_FLAG));
if (tci_flag)
dseg_open(&tci, seg_rows, seg_cols, num_open_segs);
/* open elevation input */
ele_fd = Rast_open_old(ele_name, "");
ele_map_type = Rast_get_map_type(ele_fd);
ele_size = Rast_cell_size(ele_map_type);
elebuf = Rast_allocate_buf(ele_map_type);
afbuf = G_malloc(ncols * sizeof(ASP_FLAG));
if (ele_map_type == FCELL_TYPE || ele_map_type == DCELL_TYPE)
ele_scale = 1000; /* should be enough to do the trick */
/* initial flow accumulation */
if (run_flag) {
wat_fd = Rast_open_old(run_name, "");
wat_map_type = Rast_get_map_type(ele_fd);
wat_size = Rast_cell_size(ele_map_type);
watbuf = Rast_allocate_buf(ele_map_type);
}
else {
watbuf = watptr = NULL;
wat_fd = wat_size = wat_map_type = -1;
}
wabuf = G_malloc(ncols * sizeof(WAT_ALT));
alt_value_buf = Rast_allocate_buf(CELL_TYPE);
/* read elevation input and mark NULL/masked cells */
G_message("SECTION 1a: Mark masked and NULL cells");
MASK_flag = 0;
do_points = (GW_LARGE_INT) nrows * ncols;
for (r = 0; r < nrows; r++) {
G_percent(r, nrows, 1);
Rast_get_row(ele_fd, elebuf, r, ele_map_type);
ptr = elebuf;
if (run_flag) {
Rast_get_row(wat_fd, watbuf, r, wat_map_type);
watptr = watbuf;
}
for (c = 0; c < ncols; c++) {
afbuf[c].flag = 0;
afbuf[c].asp = 0;
/* check for masked and NULL cells */
if (Rast_is_null_value(ptr, ele_map_type)) {
FLAG_SET(afbuf[c].flag, NULLFLAG);
FLAG_SET(afbuf[c].flag, INLISTFLAG);
FLAG_SET(afbuf[c].flag, WORKEDFLAG);
Rast_set_c_null_value(&alt_value, 1);
/* flow accumulation */
Rast_set_d_null_value(&wat_value, 1);
do_points--;
}
else {
if (ele_map_type == CELL_TYPE) {
alt_value = *((CELL *)ptr);
}
else if (ele_map_type == FCELL_TYPE) {
dvalue = *((FCELL *)ptr);
dvalue *= ele_scale;
alt_value = ele_round(dvalue);
}
else if (ele_map_type == DCELL_TYPE) {
dvalue = *((DCELL *)ptr);
dvalue *= ele_scale;
alt_value = ele_round(dvalue);
}
/* flow accumulation */
if (run_flag) {
if (Rast_is_null_value(watptr, wat_map_type)) {
wat_value = 0; /* ok ? */
}
else {
if (wat_map_type == CELL_TYPE) {
wat_value = *((CELL *)watptr);
}
else if (wat_map_type == FCELL_TYPE) {
wat_value = *((FCELL *)watptr);
}
else if (wat_map_type == DCELL_TYPE) {
wat_value = *((DCELL *)watptr);
}
}
}
else {
wat_value = 1;
}
}
wabuf[c].wat = wat_value;
wabuf[c].ele = alt_value;
alt_value_buf[c] = alt_value;
ptr = G_incr_void_ptr(ptr, ele_size);
if (run_flag) {
watptr = G_incr_void_ptr(watptr, wat_size);
}
}
seg_put_row(&watalt, (char *) wabuf, r);
seg_put_row(&aspflag, (char *)afbuf, r);
if (er_flag) {
cseg_put_row(&r_h, alt_value_buf, r);
}
}
G_percent(nrows, nrows, 1); /* finish it */
Rast_close(ele_fd);
G_free(wabuf);
G_free(afbuf);
if (run_flag) {
Rast_close(wat_fd);
G_free(watbuf);
}
MASK_flag = (do_points < nrows * ncols);
/* do RUSLE */
if (er_flag) {
if (ob_flag) {
fd = Rast_open_old(ob_name, "");
buf = Rast_allocate_c_buf();
for (r = 0; r < nrows; r++) {
G_percent(r, nrows, 1);
Rast_get_c_row(fd, buf, r);
for (c = 0; c < ncols; c++) {
block_value = buf[c];
if (!Rast_is_c_null_value(&block_value) && block_value) {
seg_get(&aspflag, (char *)&af, r, c);
FLAG_SET(af.flag, RUSLEBLOCKFLAG);
seg_put(&aspflag, (char *)&af, r, c);
}
}
}
G_percent(nrows, nrows, 1); /* finish it */
Rast_close(fd);
G_free(buf);
}
if (ril_flag) {
dseg_open(&ril, seg_rows, seg_cols, num_open_segs);
dseg_read_cell(&ril, ril_name, "");
}
/* dseg_open(&slp, SROW, SCOL, num_open_segs); */
dseg_open(&s_l, seg_rows, seg_cols, num_open_segs);
if (sg_flag)
dseg_open(&s_g, seg_rows, seg_cols, num_open_segs);
if (ls_flag)
dseg_open(&l_s, seg_rows, seg_cols, num_open_segs);
}
G_debug(1, "open segments for A* points");
/* columns per segment */
seg_cols = seg_rows * seg_rows;
num_cseg_total = do_points / seg_cols;
if (do_points % seg_cols > 0)
num_cseg_total++;
/* no need to have more segments open than exist */
num_open_array_segs = num_open_segs / 16.;
if (num_open_array_segs > num_cseg_total)
num_open_array_segs = num_cseg_total;
if (num_open_array_segs < 1)
num_open_array_segs = 1;
seg_open(&astar_pts, 1, do_points, 1, seg_cols, num_open_array_segs,
sizeof(POINT));
/* one-based d-ary search_heap with astar_pts */
G_debug(1, "open segments for A* search heap");
G_debug(1, "heap memory %.2f MB", heap_mem);
/* columns per segment */
/* larger is faster */
seg_cols = seg_rows * seg_rows;
num_cseg_total = do_points / seg_cols;
if (do_points % seg_cols > 0)
num_cseg_total++;
/* no need to have more segments open than exist */
num_open_array_segs = (1 << 20) * heap_mem / (seg_cols * sizeof(HEAP_PNT));
if (num_open_array_segs > num_cseg_total)
num_open_array_segs = num_cseg_total;
if (num_open_array_segs < 2)
num_open_array_segs = 2;
G_debug(1, "A* search heap open segments %d, total %d",
num_open_array_segs, num_cseg_total);
/* the search heap will not hold more than 5% of all points at any given time ? */
/* chances are good that the heap will fit into one large segment */
seg_open(&search_heap, 1, do_points + 1, 1, seg_cols,
num_open_array_segs, sizeof(HEAP_PNT));
G_message(_("SECTION 1b: Determining Offmap Flow."));
/* heap is empty */
heap_size = 0;
if (pit_flag) {
buf = Rast_allocate_c_buf();
fd = Rast_open_old(pit_name, "");
}
else
buf = NULL;
first_astar = first_cum = -1;
for (r = 0; r < nrows; r++) {
G_percent(r, nrows, 1);
if (pit_flag)
Rast_get_c_row(fd, buf, r);
for (c = 0; c < ncols; c++) {
seg_get(&aspflag, (char *)&af, r, c);
if (!FLAG_GET(af.flag, NULLFLAG)) {
if (er_flag)
dseg_put(&s_l, &half_res, r, c);
asp_value = af.asp;
if (r == 0 || c == 0 || r == nrows - 1 ||
c == ncols - 1) {
/* dseg_get(&wat, &wat_value, r, c); */
seg_get(&watalt, (char *)&wa, r, c);
wat_value = wa.wat;
if (wat_value > 0) {
wat_value = -wat_value;
/* dseg_put(&wat, &wat_value, r, c); */
wa.wat = wat_value;
seg_put(&watalt, (char *)&wa, r, c);
}
if (r == 0)
asp_value = -2;
else if (c == 0)
asp_value = -4;
else if (r == nrows - 1)
asp_value = -6;
else if (c == ncols - 1)
asp_value = -8;
/* cseg_get(&alt, &alt_value, r, c); */
alt_value = wa.ele;
add_pt(r, c, alt_value);
FLAG_SET(af.flag, INLISTFLAG);
FLAG_SET(af.flag, EDGEFLAG);
af.asp = asp_value;
seg_put(&aspflag, (char *)&af, r, c);
}
else {
seg_get(&watalt, (char *)&wa, r, c);
for (ct_dir = 0; ct_dir < sides; ct_dir++) {
/* get r, c (r_nbr, c_nbr) for neighbours */
r_nbr = r + nextdr[ct_dir];
c_nbr = c + nextdc[ct_dir];
seg_get(&aspflag, (char *)&af_nbr, r_nbr, c_nbr);
if (FLAG_GET(af_nbr.flag, NULLFLAG)) {
af.asp = -1 * drain[r - r_nbr + 1][c - c_nbr + 1];
add_pt(r, c, wa.ele);
FLAG_SET(af.flag, INLISTFLAG);
FLAG_SET(af.flag, EDGEFLAG);
seg_put(&aspflag, (char *)&af, r, c);
wat_value = wa.wat;
if (wat_value > 0) {
wa.wat = -wat_value;
seg_put(&watalt, (char *)&wa, r, c);
}
break;
}
}
}
/* real depression ? */
if (pit_flag && asp_value == 0) {
if (!Rast_is_c_null_value(&buf[c]) && buf[c] != 0) {
seg_get(&watalt, (char *)&wa, r, c);
add_pt(r, c, wa.ele);
FLAG_SET(af.flag, INLISTFLAG);
FLAG_SET(af.flag, EDGEFLAG);
seg_put(&aspflag, (char *)&af, r, c);
wat_value = wa.wat;
if (wat_value > 0) {
wa.wat = -wat_value;
seg_put(&watalt, (char *)&wa, r, c);
}
}
}
} /* end non-NULL cell */
} /* end column */
}
G_percent(r, nrows, 1); /* finish it */
return 0;
}
int thin_seg(int stream_id)
{
int thinned = 0;
int r, c, r_nbr, c_nbr, last_r, last_c;
CELL curr_stream, no_stream = 0;
int asp_r[9] = { 0, -1, -1, -1, 0, 1, 1, 1, 0 };
int asp_c[9] = { 0, 1, 0, -1, -1, -1, 0, 1, 1 };
ASP_FLAG af;
r = stream_node[stream_id].r;
c = stream_node[stream_id].c;
cseg_get(&stream, &curr_stream, r, c);
seg_get(&aspflag, (char *)&af, r, c);
if (af.asp > 0) {
/* get downstream point */
last_r = r + asp_r[(int)af.asp];
last_c = c + asp_c[(int)af.asp];
cseg_get(&stream, &curr_stream, last_r, last_c);
if (curr_stream != stream_id)
return thinned;
/* get next downstream point */
seg_get(&aspflag, (char *)&af, last_r, last_c);
while (af.asp > 0) {
r_nbr = last_r + asp_r[(int)af.asp];
c_nbr = last_c + asp_c[(int)af.asp];
if (r_nbr == last_r && c_nbr == last_c)
return thinned;
if (r_nbr < 0 || r_nbr >= nrows || c_nbr < 0 || c_nbr >= ncols)
return thinned;
cseg_get(&stream, &curr_stream, r_nbr, c_nbr);
if (curr_stream != stream_id)
return thinned;
if (abs(r_nbr - r) < 2 && abs(c_nbr - c) < 2) {
/* eliminate last point */
cseg_put(&stream, &no_stream, last_r, last_c);
FLAG_UNSET(af.flag, STREAMFLAG);
seg_put(&aspflag, (char *)&af, last_r, last_c);
/* update start point */
seg_get(&aspflag, (char *)&af, r, c);
af.asp = drain[r - r_nbr + 1][c - c_nbr + 1];
seg_put(&aspflag, (char *)&af, r, c);
thinned = 1;
}
else {
/* nothing to eliminate, continue from last point */
r = last_r;
c = last_c;
}
last_r = r_nbr;
last_c = c_nbr;
seg_get(&aspflag, (char *)&af, last_r, last_c);
}
}
return thinned;
}
int do_cum(void)
{
int r, c, dr, dc;
char asp_val, asp_val_down;
char is_swale, this_flag_value, flag_value;
DCELL value, valued;
POINT point;
int killer, threshold;
int asp_r[9] = { 0, -1, -1, -1, 0, 1, 1, 1, 0 };
int asp_c[9] = { 0, 1, 0, -1, -1, -1, 0, 1, 1 };
WAT_ALT wa, wadown;
G_message(_("SECTION 3: Accumulating Surface Flow with SFD."));
if (bas_thres <= 0)
threshold = 60;
else
threshold = bas_thres;
for (killer = 0; killer < do_points; killer++) {
G_percent(killer, do_points, 1);
seg_get(&astar_pts, (char *)&point, 0, killer);
r = point.r;
c = point.c;
bseg_get(&asp, &asp_val, r, c);
if (asp_val) {
dr = r + asp_r[ABS(asp_val)];
dc = c + asp_c[ABS(asp_val)];
}
/* skip user-defined depressions */
else
dr = dc = -1;
bseg_get(&bitflags, &this_flag_value, r, c);
FLAG_UNSET(this_flag_value, WORKEDFLAG);
if (dr >= 0 && dr < nrows && dc >= 0 && dc < ncols) {
/* TODO: do not distribute flow along edges, this causes artifacts */
seg_get(&watalt, (char *)&wa, r, c);
value = wa.wat;
is_swale = FLAG_GET(this_flag_value, SWALEFLAG);
if (fabs(value) >= threshold && !is_swale) {
is_swale = 1;
FLAG_SET(this_flag_value, SWALEFLAG);
}
seg_get(&watalt, (char *)&wadown, dr, dc);
valued = wadown.wat;
if (value > 0) {
if (valued > 0)
valued += value;
else
valued -= value;
}
else {
if (valued < 0)
valued += value;
else
valued = value - valued;
}
wadown.wat = valued;
seg_put(&watalt, (char *)&wadown, dr, dc);
/* update asp for depression */
if (is_swale || fabs(valued) >= threshold) {
bseg_get(&bitflags, &flag_value, dr, dc);
FLAG_SET(flag_value, SWALEFLAG);
bseg_put(&bitflags, &flag_value, dr, dc);
is_swale = 1;
}
else {
if (er_flag && !is_swale && !FLAG_GET(this_flag_value, RUSLEBLOCKFLAG))
slope_length(r, c, dr, dc);
}
}
bseg_put(&bitflags, &this_flag_value, r, c);
}
G_percent(do_points, do_points, 1); /* finish it */
seg_close(&astar_pts);
return 0;
}
int do_cum_mfd(void)
{
int r, c, dr, dc;
DCELL value, valued, *wat_nbr;
POINT point;
WAT_ALT wa;
int killer, threshold;
/* MFD */
int mfd_cells, stream_cells, swale_cells, astar_not_set, is_null;
double *dist_to_nbr, *weight, sum_weight, max_weight;
int r_nbr, c_nbr, r_max, c_max, ct_dir, np_side, max_side;
double dx, dy;
CELL ele, *ele_nbr;
char asp_val, asp_val_down;
double prop, max_acc;
int workedon, edge, is_swale, flat;
char *flag_nbr, this_flag_value, flag_value;
int asp_r[9] = { 0, -1, -1, -1, 0, 1, 1, 1, 0 };
int asp_c[9] = { 0, 1, 0, -1, -1, -1, 0, 1, 1 };
G_message(_("SECTION 3: Accumulating Surface Flow with MFD."));
G_debug(1, "MFD convergence factor set to %d.", c_fac);
/* distances to neighbours */
dist_to_nbr = (double *)G_malloc(sides * sizeof(double));
weight = (double *)G_malloc(sides * sizeof(double));
for (ct_dir = 0; ct_dir < sides; ct_dir++) {
/* get r, c (r_nbr, c_nbr) for neighbours */
r_nbr = nextdr[ct_dir];
c_nbr = nextdc[ct_dir];
/* account for rare cases when ns_res != ew_res */
dy = ABS(r_nbr) * window.ns_res;
dx = ABS(c_nbr) * window.ew_res;
if (ct_dir < 4)
dist_to_nbr[ct_dir] = dx + dy;
else
dist_to_nbr[ct_dir] = sqrt(dx * dx + dy * dy);
}
flag_nbr = (char *)G_malloc(sides * sizeof(char));
wat_nbr = (DCELL *)G_malloc(sides * sizeof(DCELL));
ele_nbr = (CELL *)G_malloc(sides * sizeof(CELL));
workedon = 0;
if (bas_thres <= 0)
threshold = 60;
else
threshold = bas_thres;
for (killer = 0; killer < do_points; killer++) {
G_percent(killer, do_points, 1);
seg_get(&astar_pts, (char *)&point, 0, killer);
r = point.r;
c = point.c;
bseg_get(&asp, &asp_val, r, c);
if (asp_val) {
dr = r + asp_r[ABS(asp_val)];
dc = c + asp_c[ABS(asp_val)];
}
/* skip user-defined depressions */
else
dr = dc = -1;
/* WORKEDFLAG has been set during A* Search
* reversed meaning here: 0 = done, 1 = not yet done */
bseg_get(&bitflags, &this_flag_value, r, c);
FLAG_UNSET(this_flag_value, WORKEDFLAG);
if (dr >= 0 && dr < nrows && dc >= 0 && dc < ncols) {
r_max = dr;
c_max = dc;
seg_get(&watalt, (char *)&wa, r, c);
value = wa.wat;
/* get weights */
max_weight = 0;
sum_weight = 0;
np_side = -1;
mfd_cells = 0;
stream_cells = 0;
swale_cells = 0;
astar_not_set = 1;
ele = wa.ele;
is_null = 0;
edge = 0;
flat = 1;
/* this loop is needed to get the sum of weights */
for (ct_dir = 0; ct_dir < sides; ct_dir++) {
/* get r, c (r_nbr, c_nbr) for neighbours */
r_nbr = r + nextdr[ct_dir];
c_nbr = c + nextdc[ct_dir];
weight[ct_dir] = -1;
wat_nbr[ct_dir] = 0;
ele_nbr[ct_dir] = 0;
/* check if neighbour is within region */
if (r_nbr >= 0 && r_nbr < nrows && c_nbr >= 0 &&
c_nbr < ncols) {
if (dr == r_nbr && dc == c_nbr)
np_side = ct_dir;
bseg_get(&bitflags, &flag_nbr[ct_dir], r_nbr, c_nbr);
seg_get(&watalt, (char *)&wa, r_nbr, c_nbr);
wat_nbr[ct_dir] = wa.wat;
ele_nbr[ct_dir] = wa.ele;
/* check for swale or stream cells */
is_swale = FLAG_GET(flag_nbr[ct_dir], SWALEFLAG);
if (is_swale)
swale_cells++;
if ((ABS(wat_nbr[ct_dir]) + 0.5) >= threshold &&
ct_dir != np_side && ele_nbr[ct_dir] > ele)
stream_cells++;
if (FLAG_GET(flag_nbr[ct_dir], WORKEDFLAG)) {
if (ele_nbr[ct_dir] != ele)
flat = 0;
edge = is_null = FLAG_GET(flag_nbr[ct_dir], NULLFLAG);
if (!is_null && ele_nbr[ct_dir] <= ele) {
if (ele_nbr[ct_dir] < ele) {
weight[ct_dir] =
mfd_pow(((ele -
ele_nbr[ct_dir]) / dist_to_nbr[ct_dir]),
c_fac);
}
if (ele_nbr[ct_dir] == ele) {
weight[ct_dir] =
mfd_pow((0.5 / dist_to_nbr[ct_dir]),
c_fac);
}
sum_weight += weight[ct_dir];
mfd_cells++;
if (weight[ct_dir] > max_weight) {
max_weight = weight[ct_dir];
}
if (dr == r_nbr && dc == c_nbr) {
astar_not_set = 0;
}
}
}
}
else
edge = 1;
if (edge)
break;
}
/* do not continue streams along edges, this causes artifacts */
if (edge) {
is_swale = FLAG_GET(this_flag_value, SWALEFLAG);
if (is_swale && asp_val > 0) {
asp_val = -1 * drain[r - r_nbr + 1][c - c_nbr + 1];
bseg_put(&asp, &asp_val, r, c);
}
bseg_put(&bitflags, &this_flag_value, r, c);
continue;
}
/* honour A * path
* mfd_cells == 0: fine, SFD along A * path
* mfd_cells == 1 && astar_not_set == 0: fine, SFD along A * path
* mfd_cells > 0 && astar_not_set == 1: A * path not included, add to mfd_cells
*/
/* MFD, A * path not included, add to mfd_cells */
if (mfd_cells > 0 && astar_not_set == 1) {
mfd_cells++;
sum_weight += max_weight;
weight[np_side] = max_weight;
max_side = np_side;
}
/* set flow accumulation for neighbours */
max_acc = -1;
max_side = np_side;
if (mfd_cells > 1) {
prop = 0.0;
for (ct_dir = 0; ct_dir < sides; ct_dir++) {
r_nbr = r + nextdr[ct_dir];
c_nbr = c + nextdc[ct_dir];
/* check if neighbour is within region */
if (r_nbr >= 0 && r_nbr < nrows && c_nbr >= 0 &&
c_nbr < ncols && weight[ct_dir] > -0.5) {
if (FLAG_GET(flag_nbr[ct_dir], WORKEDFLAG)) {
weight[ct_dir] = weight[ct_dir] / sum_weight;
/* check everything adds up to 1.0 */
prop += weight[ct_dir];
if (value > 0) {
if (wat_nbr[ct_dir] > 0)
wat_nbr[ct_dir] += value * weight[ct_dir];
else
wat_nbr[ct_dir] -= value * weight[ct_dir];
}
else {
if (wat_nbr[ct_dir] < 0)
wat_nbr[ct_dir] += value * weight[ct_dir];
else
wat_nbr[ct_dir] = value * weight[ct_dir] - wat_nbr[ct_dir];
}
valued = wat_nbr[ct_dir];
wa.wat = valued;
wa.ele = ele_nbr[ct_dir];
seg_put(&watalt, (char *)&wa, r_nbr, c_nbr);
/* get main drainage direction */
if (ABS(wat_nbr[ct_dir]) >= max_acc) {
max_acc = ABS(wat_nbr[ct_dir]);
r_max = r_nbr;
c_max = c_nbr;
max_side = ct_dir;
}
}
else if (ct_dir == np_side) {
/* check for consistency with A * path */
workedon++;
}
}
}
/* adjust main drainage direction to A* path if possible */
/*if (fabs(wat_nbr[np_side]) >= max_acc) {
max_acc = fabs(wat_nbr[np_side]);
r_max = dr;
c_max = dc;
} */
if (ABS(prop - 1.0) > 5E-6f) {
G_warning(_("MFD: cumulative proportion of flow distribution not 1.0 but %f"),
prop);
}
}
/* SFD-like accumulation */
else {
valued = wat_nbr[np_side];
if (value > 0) {
if (valued > 0)
valued += value;
else
valued -= value;
}
else {
if (valued < 0)
valued += value;
else
valued = value - valued;
}
wa.wat = valued;
wa.ele = ele_nbr[np_side];
seg_put(&watalt, (char *)&wa, dr, dc);
}
/* update asp */
if (dr != r_max || dc != c_max) {
if (asp_val < 0) {
asp_val = -1 * drain[r - r_max + 1][c - c_max + 1];
}
else
asp_val = drain[r - r_max + 1][c - c_max + 1];
bseg_put(&asp, &asp_val, r, c);
}
is_swale = FLAG_GET(this_flag_value, SWALEFLAG);
/* start new stream */
value = ABS(value) + 0.5;
if (!is_swale && (int)value >= threshold && stream_cells < 1 &&
swale_cells < 1 && !flat) {
FLAG_SET(this_flag_value, SWALEFLAG);
is_swale = 1;
}
/* continue stream */
if (is_swale) {
flag_value = flag_nbr[max_side];
FLAG_SET(flag_value, SWALEFLAG);
bseg_put(&bitflags, &flag_value, r_max, c_max);
}
else {
if (er_flag && !is_swale && !FLAG_GET(this_flag_value, RUSLEBLOCKFLAG))
slope_length(r, c, r_max, c_max);
}
}
bseg_put(&bitflags, &this_flag_value, r, c);
}
G_percent(do_points, do_points, 1); /* finish it */
if (workedon)
G_warning(_("MFD: A * path already processed when distributing flow: %d of %d cells"),
workedon, do_points);
seg_close(&astar_pts);
G_free(dist_to_nbr);
G_free(weight);
G_free(wat_nbr);
G_free(ele_nbr);
G_free(flag_nbr);
return 0;
}
int do_astar(void)
{
int doer, count;
int upr, upc, r = -1, c = -1, ct_dir;
CELL alt_val, alt_nbr[8];
WAT_ALT wa;
char asp_val;
char flag_value, is_in_list, is_worked;
HEAP_PNT heap_p;
/* sides
* |7|1|4|
* |2| |3|
* |5|0|6|
*/
int nbr_ew[8] = { 0, 1, 2, 3, 1, 0, 0, 1 };
int nbr_ns[8] = { 0, 1, 2, 3, 3, 2, 3, 2 };
double dx, dy, dist_to_nbr[8], ew_res, ns_res;
double slope[8];
int skip_diag;
int count_edge = 0, count_diag = 0, count_edge_sink = 0, count_diag_sink = 0;
G_message(_("SECTION 2: A* Search."));
for (ct_dir = 0; ct_dir < sides; ct_dir++) {
/* get r, c (upr, upc) for neighbours */
upr = nextdr[ct_dir];
upc = nextdc[ct_dir];
/* account for rare cases when ns_res != ew_res */
dy = ABS(upr) * window.ns_res;
dx = ABS(upc) * window.ew_res;
if (ct_dir < 4)
dist_to_nbr[ct_dir] = dx + dy;
else
dist_to_nbr[ct_dir] = sqrt(dx * dx + dy * dy);
}
ew_res = window.ew_res;
ns_res = window.ns_res;
if (heap_size == 0)
G_fatal_error(_("No seeds for A* Search"));
G_debug(1, "heap size %d, points %d", heap_size, do_points);
count = 0;
doer = do_points - 1;
/* A* Search: search uphill, get downhill paths */
while (heap_size > 0) {
G_percent(count++, do_points, 1);
heap_p = drop_pt();
r = heap_p.pnt.r;
c = heap_p.pnt.c;
G_debug(3, "heap size %d, r %d, c %d", heap_size, r, c);
alt_val = heap_p.ele;
/* check all neighbours, breadth first search */
for (ct_dir = 0; ct_dir < sides; ct_dir++) {
/* get r, c (upr, upc) for this neighbour */
upr = r + nextdr[ct_dir];
upc = c + nextdc[ct_dir];
slope[ct_dir] = alt_nbr[ct_dir] = 0;
/* check if upr, upc are within region */
if (upr >= 0 && upr < nrows && upc >= 0 && upc < ncols) {
bseg_get(&bitflags, &flag_value, upr, upc);
is_in_list = FLAG_GET(flag_value, INLISTFLAG);
is_worked = FLAG_GET(flag_value, WORKEDFLAG);
skip_diag = 0;
/* avoid diagonal flow direction bias */
if (!is_worked) {
seg_get(&watalt, (char *)&wa, upr, upc);
alt_nbr[ct_dir] = wa.ele;
slope[ct_dir] =
get_slope2(alt_val, alt_nbr[ct_dir],
dist_to_nbr[ct_dir]);
}
if (!is_in_list) {
if (ct_dir > 3 && slope[ct_dir] > 0) {
if (slope[nbr_ew[ct_dir]] > 0) {
/* slope to ew nbr > slope to center */
if (slope[ct_dir] <
get_slope2(alt_nbr[nbr_ew[ct_dir]],
alt_nbr[ct_dir], ew_res))
skip_diag = 1;
}
if (!skip_diag && slope[nbr_ns[ct_dir]] > 0) {
/* slope to ns nbr > slope to center */
if (slope[ct_dir] <
get_slope2(alt_nbr[nbr_ns[ct_dir]],
alt_nbr[ct_dir], ns_res))
skip_diag = 1;
}
}
}
/* add neighbour as new point if not in the list */
if (is_in_list == 0 && skip_diag == 0) {
/* set flow direction */
asp_val = drain[upr - r + 1][upc - c + 1];
add_pt(upr, upc, alt_nbr[ct_dir]);
bseg_put(&asp, &asp_val, upr, upc);
FLAG_SET(flag_value, INLISTFLAG);
bseg_put(&bitflags, &flag_value, upr, upc);
if (alt_nbr[ct_dir] < alt_val) {
if (ct_dir < 4)
count_edge_sink++;
else
count_diag_sink++;
}
/* includes flat areas */
else {
if (ct_dir < 4)
count_edge++;
else
count_diag++;
}
}
else if (is_in_list && is_worked == 0 &&
FLAG_GET(flag_value, EDGEFLAG)) {
/* neighbour is edge in list, not yet worked */
bseg_get(&asp, &asp_val, upr, upc);
if (asp_val < 0) {
/* adjust flow direction for edge cell */
asp_val = drain[upr - r + 1][upc - c + 1];
bseg_put(&asp, &asp_val, upr, upc);
seg_get(&watalt, (char *)&wa, r, c);
if (wa.wat > 0) {
wa.wat = -wa.wat;
seg_put(&watalt, (char *)&wa, r, c);
}
}
/* neighbour is inside real depression, not yet worked */
else if (asp_val == 0) {
asp_val = drain[upr - r + 1][upc - c + 1];
bseg_put(&asp, &asp_val, upr, upc);
}
}
}
}
/* add astar points to sorted list for flow accumulation */
seg_put(&astar_pts, (char *)&heap_p.pnt, 0, doer);
doer--;
bseg_get(&bitflags, &flag_value, r, c);
FLAG_SET(flag_value, WORKEDFLAG);
bseg_put(&bitflags, &flag_value, r, c);
}
if (doer != -1)
G_fatal_error(_("bug in A* Search: doer %d heap size %d count %d"),
doer, heap_size, count);
seg_close(&search_heap);
G_percent(count, do_points, 1); /* finish it */
G_debug(1, "edge direction: %d (%.2f%%)", count_edge, (double) 100. * count_edge / (count_edge + count_diag));
G_debug(1, "diag direction: %d (%.2f%%)", count_diag, (double) 100. * count_diag / (count_edge + count_diag));
G_debug(1, "edge out of depression: %d (%.2f%%)", count_edge_sink, (double) 100. * count_edge_sink / (count_edge_sink + count_diag_sink));
G_debug(1, "diag out of depression: %d (%.2f%%)", count_diag_sink, (double) 100. * count_diag_sink / (count_edge_sink + count_diag_sink));
return 0;
}
