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Add resize data to specify resolution

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This commit is contained in:
Gareth Evans
2017-06-02 21:18:31 +01:00
parent 67c145dd7d
commit 90bd2a3d32
3 changed files with 33 additions and 1 deletions
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30
inputs.cc
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@@ -9,6 +9,21 @@
#include "main.hh"
#include "tiles.hh"
/* Computes the distance between two long/lat points */
double haversine_formula(double th1, double ph1, double th2, double ph2)
{
#define TO_RAD (3.1415926536 / 180)
int R = 6371;
double dx, dy, dz;
ph1 -= ph2;
ph1 *= TO_RAD, th1 *= TO_RAD, th2 *= TO_RAD;
dz = sin(th1) - sin(th2);
dx = cos(ph1) * cos(th1) - cos(th2);
dy = sin(ph1) * cos(th1);
return asin(sqrt(dx * dx + dy * dy + dz * dz) / 2) * 2 * R;
}
/*
* resample_data
* This is used to resample tile data. It is particularly designed for
@@ -84,6 +99,21 @@ int resample_data(int scaling_factor){
return 0;
}
/*
* resize_data
* This function works in conjuntion with resample_data. It takes a
* resolution value in meters as its argument. It then calculates the
* nearest (via averaging) resample value and calls resample_data
*/
int resize_data(int resolution){
double current_res_km = haversine_formula(dem[0].max_north, dem[0].max_west, dem[0].max_north, dem[0].min_west);
int current_res = (int) ceil((current_res_km/IPPD)*1000);
int scaling_factor = resolution / current_res;
if (debug)
fprintf(stderr, "Resampling: Current %dm Desired %dm Scale %d\n", current_res, resolution, scaling_factor);
return resample_data(scaling_factor);
}
int loadClutter(char *filename, double radius, struct site tx)
{
/* This function reads a MODIS 17-class clutter file in ASCII Grid format.