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Fix some rounding error just by staying in double precision

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Eric Fischer
2015-10-12 12:51:55 -07:00
parent 8c5681a582
commit 77b451f2c8
1 changed files with 1 additions and 2 deletions
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projection.c
+1 -2
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@@ -37,8 +37,7 @@ void latlon2tile(double lat, double lon, int zoom, unsigned int *x, unsigned int
void tile2latlon(unsigned int x, unsigned int y, int zoom, double *lat, double *lon) { void tile2latlon(unsigned int x, unsigned int y, int zoom, double *lat, double *lon) {
unsigned long long n = 1LL << zoom; unsigned long long n = 1LL << zoom;
*lon = 360.0 * x / n - 180.0; *lon = 360.0 * x / n - 180.0;
float lat_rad = atan(sinh(M_PI * (1 - 2.0 * y / n))); *lat = atan(sinh(M_PI * (1 - 2.0 * y / n))) * 180.0 / M_PI;
*lat = lat_rad * 180 / M_PI;
} }
unsigned long long encode(unsigned int wx, unsigned int wy) { unsigned long long encode(unsigned int wx, unsigned int wy) {