Guides & data
Geospatial developer guides you can verify
Practical answers to the errors and format questions that interrupt real geometry work. Every guide links its technical sources; interactive examples use the same browser-only, fixture-tested engine as the universal inspector.
All guides and test data
- Formats
Geometry format size comparison
Measured WKT, WKB, EWKB, TWKB, GeoJSON and polyline sizes, with a live comparison tool.
Read guide → - WKB
WKB explained byte by byte
Decode endianness, type flags, SRIDs, counts and coordinate doubles in WKB or EWKB hex.
Read guide → - GeoJSON
Why is my GeoJSON polygon invalid?
Understand winding order, unclosed rings, self-intersections and specific validator errors.
Read guide → - Coordinates
Lat/lon vs lon/lat
A specification-linked coordinate-order table for common formats, libraries and APIs.
Read guide → - Test data
Free geometry test data
Copy valid and invalid fixtures in every supported format with real parser and validator output.
Read guide →