// 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;
}
void SET2(int I, int J, float *DXX, float DD, linearpart<float>& elevDEM, linearpart<float>& flowDir, linearpart<float>& slope) {
double dxA = elevDEM.getdxA();
double dyA = elevDEM.getdyA();
float SK[9];
float ANGLE[9];
float SMAX;
float tempFloat;
int K;
int KD;
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.};
for (K = 1; K <= 8; K++) {
VSLOPE(
elevDEM.getData(J, I, tempFloat), //felevg.d[J][I],
elevDEM.getData(J + J1[K], I + I1[K], tempFloat), //[felevg.d[J+J1[K]][I+I1[K]],
elevDEM.getData(J + J2[K], I + I2[K], tempFloat), //felevg.d[J+J2[K]][I+I2[K]],
DXX[ID1[K]],
DXX[ID2[K]],
DD,
&SK[K],
&ANGLE[K]
);
}
tempFloat = -1;
SMAX = 0.;
KD = 0;
flowDir.setData(J, I, tempFloat); //USE -1 TO INDICATE DIRECTION NOT YET SET
for (K = 1; K <= 8; K++) {
if (SK[K] > SMAX) {
SMAX = SK[K];
KD = K;
}
}
if (KD > 0) {
tempFloat = (float) (ANGC[KD]*(PI / 2) + ANGF[KD] * ANGLE[KD]);
flowDir.setData(J, I, tempFloat); //set to angle
}
slope.setData(J, I, SMAX);
}