Show HN: Shapefile viewer that asks which datum when the .prj is missing

Category: devtools

Tags: gis, shapefile, geojson, coordinate-systems, web-tool

Score: 5.3/10 (Innovation: 6, Technical: 5, Documentation: 5, Utility: 5)

A browser-based shapefile viewer and GeoJSON converter that prompts users to select the coordinate datum when the .prj file is missing, addressing a common pain point with legacy Japanese geospatial data (Tokyo Datum vs. WGS84). It is interesting because it handles the ambiguous datum detection problem explicitly rather than silently assuming WGS84.

Target audience: GIS developers, geospatial data engineers, and developers working with legacy Japanese spatial data

Repository: https://9revolution9.com/tools/geo/shp-geojson

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