Profile of William7

Some features may not work without JavaScript. Please try enabling it if you encounter problems.

2 projects

Last released Mar 20, 2026

Download GSI terrain tiles, decode proprietary PNG elevation format, and compute slope/TRI/Tobler hiking cost for Japan

Last released Mar 20, 2026

Generate 駅勢圏 (station catchment areas) for Japanese railway stations using Voronoi tessellation

Supported by