tile level (>20), mercator(minx,miny) will overflow

paulmach / orb

Types and utilities for working with 2d geometry in Golang

MIT License

892 stars 104 forks source link

Closed lujieha closed 2 years ago

lujieha commented 2 years ago

https://github.com/paulmach/orb/blob/ba1cf206b6a28651b920834d26baac25c5476e64/encoding/mvt/projection.go#L23 tile:={x:1730576,y:798477,z:21} //n=12（4096） minx := float64(tile.X << n) //minx=2793472000 (overflow)

The code is modified ： minx := float64(uint64(tile.X) << n) //minx=7088439296 (correct)

Similar bugs may appear in other codes...

paulmach commented 2 years ago