int PerformAlgorithm(char option, std::string filename, std::string output_name, std::string analysis){
Timer overall,flat_resolution_timer;
overall.start();
Array2D<elev_t> elevations(filename,false);
Array2D<d8_flowdir_t> flowdirs(elevations);
d8_flow_directions(elevations,flowdirs);
flat_resolution_timer.start();
if(option=='1'){
Array2D<int32_t> flat_resolution_mask, labels;
resolve_flats_barnes(elevations,flowdirs,flat_resolution_mask,labels);
std::cerr<<"t Seconds used to resolve flats = "<<flat_resolution_timer.lap()<<std::endl;
//If you want to leave the DEM unaltered, use this command
d8_flow_flats(flat_resolution_mask,labels,flowdirs);
std::cerr<<"t Seconds used to resolve flats and determine flow directions = "<<flat_resolution_timer.lap()<<std::endl;
} else if(option=='2'){
garbrecht_flat_type flats;
Garbrecht_FindFlats(flowdirs,flats);
Array2D<int32_t> inc1;
Array2D<int32_t> inc2;
Garbrecht_GradientTowardsLower (elevations, flowdirs, flats, inc1);
Garbrecht_GradientAwayFromHigher(elevations, flowdirs, flats, inc2);
Garbrecht_CombineGradients(elevations, inc1, inc2, 0.001);
std::cerr<<"t Seconds used to resolve flats = "<<flat_resolution_timer.lap()<<std::endl;
d8_flow_directions(elevations,flowdirs);
std::cerr<<"t Seconds used to resolve flats and determine flow directions = "<<flat_resolution_timer.lap()<<std::endl;
} else if(option=='3'){
//If you want to alter the DEM to enforce drainage, use these commands instead
//flowdirs.init(-4);
//d8_flats_alter_dem(flat_resolution_mask, labels, elevations);
//d8_flow_directions(elevations,flowdirs);
}
flowdirs.saveGDAL(output_name,analysis);
std::cerr<<"t Wall-time = "<<overall.stop()<<std::endl;
return 0;
}
int main(int argc, char **argv){
if(argc!=2){
printf("%s <INPUT DEM>\n",argv[0]);
return -1;
}
Timer overall,flat_resolution_timer;
overall.start();
float_2d elevations;
load_ascii_data(argv[1],elevations);
char_2d flowdirs;
d8_flow_directions(elevations,flowdirs);
flat_resolution_timer.start();
int_2d flat_resolution_mask, labels;
resolve_flats_barnes(elevations,flowdirs,flat_resolution_mask,labels);
printf("%f seconds used to resolve flats.\n",flat_resolution_timer.lap());
//If you want to leave the DEM unaltered, use this command
d8_flow_flats(flat_resolution_mask,labels,flowdirs);
printf("%f seconds used to resolve flats and determine flow directions.\n",flat_resolution_timer.lap());
//If you want to alter the DEM to enforce drainage, use these commands instead
/*
flowdirs.init(-4);
d8_flats_alter_dem(flat_resolution_mask, labels, elevations);
d8_flow_directions(elevations,flowdirs);
*/
output_ascii_data("out_barnes",flowdirs,0);
write_arrows("out_barnes_arrows",flowdirs);
overall.stop();
printf("Barnes algorithm took %f seconds overall.\n",overall.accumulated());
return 0;
}