ExternalVendorCode/tippecanoe
1
0
Fork 0
mirror of https://github.com/mapbox/tippecanoe.git synced 2025-01-22 04:18:01 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Fix some rounding error just by staying in double precision

Browse Source
This commit is contained in:
Eric Fischer 2015-10-12 12:51:55 -07:00
parent 8c5681a582
commit 77b451f2c8
1 changed files with 1 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
projection.c
View File

@ -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) {
unsigned long long n = 1LL << zoom;
*lon = 360.0 * x / n - 180.0;
float lat_rad = atan(sinh(M_PI * (1 - 2.0 * y / n)));
*lat = lat_rad * 180 / M_PI;
*lat = atan(sinh(M_PI * (1 - 2.0 * y / n))) * 180.0 / M_PI;
}
unsigned long long encode(unsigned int wx, unsigned int wy) {