pyproj.CRS.from_string('foo') actually returns a CRS!

[maximlt]

Hi everybody!

I was surprised to see that pyproj.CRS.from_string('foo') actually returns a projection (see below). I guess that there is a case where a regex is built with 'foo' that loops up a matching projection name (Amersfoort). Is that a bug that should be reported or is it the expected behaviour?

<Geographic 2D CRS: EPSG:4289>
Name: Amersfoort
Axis Info [ellipsoidal]:
- Lat[north]: Geodetic latitude (degree)
- Lon[east]: Geodetic longitude (degree)
Area of Use:
- name: Netherlands - onshore, including Waddenzee, Dutch Wadden Islands and 12-mile offshore coastal zone.
- bounds: (3.2, 50.75, 7.22, 53.7)
Datum: Amersfoort
- Ellipsoid: Bessel 1841
- Prime Meridian: Greenwich

[snowman2]

The fuzzy matching is handled by PROJ:

projinfo foo
PROJ.4 string:
+proj=longlat +ellps=bessel +no_defs +type=crs

WKT2:2019 string:
GEOGCRS["Amersfoort",
    DATUM["Amersfoort",
        ELLIPSOID["Bessel 1841",6377397.155,299.1528128,
            LENGTHUNIT["metre",1]]],
    PRIMEM["Greenwich",0,
        ANGLEUNIT["degree",0.0174532925199433]],
    CS[ellipsoidal,2],
        AXIS["geodetic latitude (Lat)",north,
            ORDER[1],
            ANGLEUNIT["degree",0.0174532925199433]],
        AXIS["geodetic longitude (Lon)",east,
            ORDER[2],
            ANGLEUNIT["degree",0.0174532925199433]],
    USAGE[
        SCOPE["Intermediate CRS in transformation to and from projected CRS."],
        AREA["Netherlands - onshore, including Waddenzee, Dutch Wadden Islands and 12-mile offshore coastal zone."],
        BBOX[50.75,3.2,53.7,7.22]],
    ID["EPSG",4289]]

You could ask there what the current expected behavior is: https://github.com/osgeo/PROJ/

[maximlt]

Thanks for the quick answer!