// Sets only flowDir only where there is a positive slope
// Returns number of cells which are flat
int setPosDir(linearpart<float>& elevDEM, linearpart<short>& flowDir)
{
double dxA = elevDEM.getdxA();
double dyA = elevDEM.getdyA();
int nx = elevDEM.getnx();
int ny = elevDEM.getny();
int numFlat = 0;
double tempdxc, tempdyc;
fact = new double*[ny]; // initialize 2d array by Nazmus 2/16
for(int m = 0; m<ny; m++)
fact[m] = new double[9];
for (int m = 0; m<ny; m++) {
for (int k = 1; k <= 8; k++) {
elevDEM.getdxdyc(m, tempdxc, tempdyc);
fact[m][k] = (double) (1./sqrt(d1[k]*d1[k]*tempdxc*tempdxc + d2[k]*d2[k]*tempdyc*tempdyc));
}
}
for (int j = 0; j < ny; j++) {
for (int i=0; i < nx; i++) {
//FlowDir is nodata if it is on the border OR elevDEM has no data
if (elevDEM.isNodata(i,j) || !elevDEM.hasAccess(i-1,j) || !elevDEM.hasAccess(i+1,j) ||
!elevDEM.hasAccess(i,j-1) || !elevDEM.hasAccess(i,j+1)) {
//do nothing
continue;
}
//Check if cell is "contaminated" (neighbors have no data)
// set flowDir to noData if contaminated
bool contaminated = false;
for (int k=1; k<=8; k++) {
int in=i+d1[k];
int jn=j+d2[k];
if (elevDEM.isNodata(in,jn)) {
contaminated = true;
break;
}
}
if (contaminated) {
flowDir.setToNodata(i,j);
} else {
// If cell is not contaminated,
flowDir.setData(i, j, 0);
setFlow(i,j, flowDir, elevDEM);
if (flowDir.getData(i,j) == 0) {
numFlat++;
}
}
}
}
return numFlat;
}
long setPosDirDinf(linearpart<float>& elevDEM, linearpart<float>& flowDir, linearpart<float>& slope, int useflowfile) {
double dxA = elevDEM.getdxA();
double dyA = elevDEM.getdyA();
long nx = elevDEM.getnx();
long ny = elevDEM.getny();
float tempFloat;
double tempdxc, tempdyc;
int i, j, k, in, jn, con;
long numFlat = 0;
tempFloat = 0;
for (j = 0; j < ny; j++) {
for (i = 0; i < nx; i++) {
//FlowDir is nodata if it is on the border OR elevDEM has no data
if (elevDEM.isNodata(i, j) || !elevDEM.hasAccess(i - 1, j) || !elevDEM.hasAccess(i + 1, j) ||
!elevDEM.hasAccess(i, j - 1) || !elevDEM.hasAccess(i, j + 1)) {
//do nothing
} else {
//Check if cell is "contaminated" (neighbors have no data)
// set flowDir to noData if contaminated
con = 0;
for (k = 1; k <= 8 && con != -1; k++) {
in = i + d1[k];
jn = j + d2[k];
if (elevDEM.isNodata(in, jn)) con = -1;
}
if (con == -1)
flowDir.setToNodata(i, j);
//If cell is not contaminated,
else {
tempFloat = -1.;
flowDir.setData(i, j, tempFloat); //set to -1
elevDEM.getdxdyc(j, tempdxc, tempdyc);
float DXX[3] = {0, tempdxc, tempdyc}; //tardemlib.cpp ln 1291
float DD = sqrt(tempdxc * tempdxc + tempdyc * tempdyc); //tardemlib.cpp ln 1293
SET2(j, i, DXX, DD, elevDEM, flowDir, slope); //i=y in function form old code j is x switched on purpose
// Use SET2 from serial code here modified to get what it has as felevg.d from elevDEM partition
// Modify to return 0 if there is a 0 slope. Modify SET2 to output flowDIR as no data (do nothing
// if verified initialization to nodata) and
// slope as 0 if a positive slope is not found
//setFlow( i,j, flowDir, elevDEM, area, useflowfile);
if (flowDir.getData(i, j, tempFloat) == -1)
numFlat++;
}
}
}
}
return numFlat;
}
//Set positive flowdirections of elevDEM
void setFlow(int i, int j, linearpart<short>& flowDir, linearpart<float>& elevDEM)
{
int in,jn;
int amax=0;
float smax=0;
float elev = elevDEM.getData(i, j);
// fixme: return instead of checking isNodata
for (short k=1; k<=8 && !flowDir.isNodata(i,j); k+=2) {
in=i+d1[k];
jn=j+d2[k];
float slope = fact[j][k] * (elev - elevDEM.getData(in,jn));
if (slope > smax) {
smax=slope;
short dirnb=flowDir.getData(in,jn);
if (dirnb > 0 && abs(dirnb-k) == 4) {
flowDir.setToNodata(i,j);
} else {
flowDir.setData(i,j,k);
}
}
}
for (short k=2; k<=8 && !flowDir.isNodata(i,j); k+=2) {
in=i+d1[k];
jn=j+d2[k];
float slope = fact[j][k] * (elev - elevDEM.getData(in,jn));
if (slope > smax && !cellsCross(k,i,j,flowDir)) {
smax = slope;
short dirnb = flowDir.getData(in,jn);
if (dirnb > 0 && abs(dirnb-k) == 4) {
flowDir.setToNodata(i,j);
} else {
flowDir.setData(i,j,k);
}
}
}
}
void flowTowardsLower(T& elev, linearpart<float>& flowDir, std::vector<std::vector<node>>&islands, SparsePartition<short>& inc)
{
long nx = flowDir.getnx();
long ny = flowDir.getny();
std::vector<node> lowBoundaries;
// Find low boundaries.
for(auto& island : islands) {
for(node flat : island) {
float flatElev = elev.getData(flat.x, flat.y);
for (int k = 1; k <= 8; k++) {
if (dontCross(k, flat.x, flat.y, flowDir) == 0) {
int in = flat.x + d1[k];
int jn = flat.y + d2[k];
if (!flowDir.hasAccess(in, jn))
continue;
auto elevDiff = flatElev - elev.getData(in,jn);
float flow = flowDir.getData(in, jn);
bool edgeDrain = flowDir.isNodata(in, jn);
// Adjacent cell drains and is equal or lower in elevation so this is a low boundary
if ((elevDiff >= 0 && flow >= 0.0) || edgeDrain) {
lowBoundaries.push_back(flat);
inc.setData(flat.x, flat.y, -1);
// No need to check the other neighbors
break;
}
}
}
}
}
size_t numInc = propagateIncrements(flowDir, inc, lowBoundaries);
// Not all grid cells were resolved - pits remain
// Remaining grid cells are unresolvable pits
if (numInc > 0)
{
markPits(elev, flowDir, islands, inc);
}
}
//Calculate the slope information of flowDir to slope
void calcSlope(linearpart<short>& flowDir, linearpart<float>& elevDEM, linearpart<float>& slope)
{
int nx = elevDEM.getnx();
int ny = elevDEM.getny();
for (int j=0; j < ny; j++) {
for (int i=0; i < nx; i++) {
// If i,j is on the border or flowDir has no data, set slope(i,j) to slopeNoData
if (flowDir.isNodata(i,j) || !flowDir.hasAccess(i-1,j) || !flowDir.hasAccess(i+1,j) ||
!flowDir.hasAccess(i,j-1) || !flowDir.hasAccess(i,j+1)) {
slope.setToNodata(i, j);
} else {
short flowDirection = flowDir.getData(i,j);
int in = i + d1[flowDirection];
int jn = j + d2[flowDirection];
float elevDiff = elevDEM.getData(i,j) - elevDEM.getData(in,jn);
slope.setData(i,j, elevDiff*fact[j][flowDirection]);
}
}
}
}
void SET2(int I, int J, float *DXX, float DD, T& elevDEM, SparsePartition<short>& elev2, linearpart<float>& flowDir) {
float SK[9];
float ANGLE[9];
float SMAX = 0.0;
float tempFloat;
short tempShort, tempShort1, tempShort2;
int K;
int KD = 0;
int ID1[] = {0, 1, 2, 2, 1, 1, 2, 2, 1};
int ID2[] = {0, 2, 1, 1, 2, 2, 1, 1, 2};
int I1[] = {0, 0, -1, -1, 0, 0, 1, 1, 0};
int I2[] = {0, -1, -1, -1, -1, 1, 1, 1, 1};
int J1[] = {0, 1, 0, 0, -1, -1, 0, 0, 1};
int J2[] = {0, 1, 1, -1, -1, -1, -1, 1, 1};
float ANGC[] = {0, 0., 1., 1., 2., 2., 3., 3., 4.};
float ANGF[] = {0, 1., -1., 1., -1., 1., -1., 1., -1.};
bool diagOutFound = false;
for (K = 1; K <= 8; K++) {
tempShort1 = elev2.getData(J + J1[K], I + I1[K]);
tempShort2 = elev2.getData(J + J2[K], I + I2[K]);
if (tempShort1 <= 0 && tempShort2 <= 0) { //Both E1 and E2 are outside the flat get slope and angle
float a = elevDEM.getData(J, I);
float b = elevDEM.getData(J + J1[K], I + I1[K]);
float c = elevDEM.getData(J + J2[K], I + I2[K]);
VSLOPE(
a, //E0
b, //E1
c, //E2
DXX[ID1[K]], //dx or dy depending on ID1
DXX[ID2[K]], //dx or dy depending on ID2
DD, //Hypotenuse
&SK[K], //Slope Returned
&ANGLE[K]//Angle Returned
);
if (SK[K] >= 0.0) // Found an outlet
{
if (b > a) // Outlet found had better be a diagonal, because it is not an edge
{
if (!diagOutFound) {
diagOutFound = true;
KD = K;
}
} else { // Here it is an adjacent outlet
KD = K;
break;
}
}
} else if (tempShort1 <= 0 && tempShort2 > 0) {//E1 is outside of the flat and E2 is inside the flat. Use DEM elevations. tempShort2/E2 is in the artificial grid
float a = elevDEM.getData(J, I);
float b = elevDEM.getData(J + J1[K], I + I1[K]);
if (a >= b) {
ANGLE[K] = 0.0;
SK[K] = 0.0;
KD = K;
break;
}
short a1 = elev2.getData(J, I);
short c1 = elev2.getData(J + J2[K], I + I2[K]);
short b1 = max(a1, c1);
VSLOPE(
(float) a1, //felevg.d[J][I],
(float) b1, //[felevg.d[J+J1[K]][I+I1[K]],
(float) c1, //felevg.d[J+J2[K]][I+I2[K]],
DXX[ID1[K]], //dx or dy
DXX[ID2[K]], //dx or dy
DD, //Hypotenuse
&SK[K], //Slope Returned
&ANGLE[K]//Angle Reutnred
);
if (SK[K] > SMAX) {
SMAX = SK[K];
KD = K;
}
} else if (tempShort1 > 0 && tempShort2 <= 0) {//E2 is out side of the flat and E1 is inside the flat, use DEM elevations
float a = elevDEM.getData(J, I);
//float b=elevDEM->getData(J+J1[K],I+I1[K],tempFloat);
float c = elevDEM.getData(J + J2[K], I + I2[K]);
if (a >= c) {
if (!diagOutFound) {
ANGLE[K] = (float) atan2(DXX[ID2[K]], DXX[ID1[K]]);
SK[K] = 0.0;
KD = K;
diagOutFound = true;
}
} else {
short a1 = elev2.getData(J, I);
short b1 = elev2.getData(J + J1[K], I + I1[K]);
short c1 = max(a1, b1);
VSLOPE(
(float) a1, //felevg.d[J][I],
(float) b1, //[felevg.d[J+J1[K]][I+I1[K]],
(float) c1, //felevg.d[J+J2[K]][I+I2[K]],
DXX[ID1[K]], //dx or dy
DXX[ID2[K]], //dx or dy
DD, //Hypotenuse
&SK[K], //Slope Returned
&ANGLE[K]//Angle Reutnred
);
if (SK[K] > SMAX) {
SMAX = SK[K];
KD = K;
}
}
} else {//Both E1 and E2 are in the flat. Use artificial elevation to get slope and angle
short a, b, c;
a = elev2.getData(J, I);
b = elev2.getData(J + J1[K], I + I1[K]);
c = elev2.getData(J + J2[K], I + I2[K]);
VSLOPE(
(float) a, //felevg.d[J][I],
(float) b, //[felevg.d[J+J1[K]][I+I1[K]],
(float) c, //felevg.d[J+J2[K]][I+I2[K]],
DXX[ID1[K]], //dx or dy
DXX[ID2[K]], //dx or dy
DD, //Hypotenuse
&SK[K], //Slope Returned
&ANGLE[K]//Angle Reutnred
);
if (SK[K] > SMAX) {
SMAX = SK[K];
KD = K;
}
}
}
//USE -1 TO INDICATE DIRECTION NOT YET SET,
// but only for non pit grid cells. Pits will have flowDir as no data
if (!flowDir.isNodata(J, I)) {
tempFloat = -1;
flowDir.setData(J, I, tempFloat);
}
if (KD > 0)//We have a flow direction. Calculate the Angle and save/write it.
{
tempFloat = (float) (ANGC[KD]*(PI / 2) + ANGF[KD] * ANGLE[KD]); //Calculate the Angle
if (tempFloat >= 0.0)//Make sure the angle is positive
flowDir.setData(J, I, tempFloat); //set the angle in the flowPartition
}
}