A CRS can specify latitude/longitude axis order while a GeoJSON-style pipeline supplies longitude/latitude. A round trip alone may succeed even when the chosen input order was wrong.
Unlock a pyproj utility with an explicit always_xy contract, input-range checks, a Chicago control point and a mathematical cross-check against Web Mercator. The reveal explains what those checks establish and what they cannot detect.
Scope: EPSG:4326 longitude/latitude to EPSG:3857, within the usual Web Mercator latitude limit. Tested on 18 October 2026 with Python 3.12 and a separately installed pyproj; no claim is made for every national grid or transformation datum. #GIS #CoordinateSystems
Unlock a pyproj utility with an explicit always_xy contract, input-range checks, a Chicago control point and a mathematical cross-check against Web Mercator. The reveal explains what those checks establish and what they cannot detect.
Scope: EPSG:4326 longitude/latitude to EPSG:3857, within the usual Web Mercator latitude limit. Tested on 18 October 2026 with Python 3.12 and a separately installed pyproj; no claim is made for every national grid or transformation datum. #GIS #CoordinateSystems
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