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Explicitly check for infinite and not-a-number input coordinates

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This commit is contained in:
Eric Fischer 2018-05-15 12:55:17 -07:00
parent 3f7ba2915a
commit a4825f6af4
3 changed files with 29 additions and 1 deletions
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4
CHANGELOG.md
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@ -1,3 +1,7 @@
## 1.28.1
* Explicitly check for infinite and not-a-number input coordinates
## 1.28.0
* Directly support gzipped GeoJSON as input files

24
projection.cpp
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@ -14,6 +14,18 @@ struct projection *projection = &projections[0];
// http://wiki.openstreetmap.org/wiki/Slippy_map_tilenames
void lonlat2tile(double lon, double lat, int zoom, long long *x, long long *y) {
// Place infinite and NaN coordinates off the edge of the Mercator plane
int lat_class = fpclassify(lat);
int lon_class = fpclassify(lon);
if (lat_class == FP_INFINITE || lat_class == FP_NAN) {
lat = 89.9;
}
if (lon_class == FP_INFINITE || lon_class == FP_NAN) {
lon = 360;
}
// Must limit latitude somewhere to prevent overflow.
// 89.9 degrees latitude is 0.621 worlds beyond the edge of the flat earth,
// hopefully far enough out that there are few expectations about the shape.
@ -49,6 +61,18 @@ void tile2lonlat(long long x, long long y, int zoom, double *lon, double *lat) {
}
void epsg3857totile(double ix, double iy, int zoom, long long *x, long long *y) {
// Place infinite and NaN coordinates off the edge of the Mercator plane
int iy_class = fpclassify(iy);
int ix_class = fpclassify(ix);
if (iy_class == FP_INFINITE || iy_class == FP_NAN) {
iy = 40000000.0;
}
if (ix_class == FP_INFINITE || ix_class == FP_NAN) {
ix = 40000000.0;
}
*x = ix * (1LL << 31) / 6378137.0 / M_PI + (1LL << 31);
*y = ((1LL << 32) - 1) - (iy * (1LL << 31) / 6378137.0 / M_PI + (1LL << 31));

2
version.hpp
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@ -1,6 +1,6 @@
#ifndef VERSION_HPP
#define VERSION_HPP
#define VERSION "tippecanoe v1.28.0\n"
#define VERSION "tippecanoe v1.28.1\n"
#endif