id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
27972	BaseSpatialField.geodetic should return SpatialReference.geographic	Sergey Fedoseev	Sergey Fedoseev	"At this moment `BaseSpatialField.geodetic` checks if the unit name associated with the field is in the list of `geodetic_units = ('decimal degree', 'degree')`, but it could simply return SpatialReference.geographic because units are geodetic iif SRS is geographic.

The current implementation of `BaseSpatialField.geodetic` gives incorrect result for some SRSes:
{{{
In [1]: from django.db import connection
In [2]: from django.contrib.gis.db.models.fields import BaseSpatialField

In [5]: BaseSpatialField(srid=4901).geodetic(connection)
Out[5]: False

In [10]: from django.contrib.gis.gdal import SpatialReference
In [11]: print(SpatialReference(4901))
GEOGCS[""ATF (Paris)"",
    DATUM[""Ancienne_Triangulation_Francaise_Paris"",
        SPHEROID[""Plessis 1817"",6376523,308.64,
            AUTHORITY[""EPSG"",""7027""]],
        AUTHORITY[""EPSG"",""6901""]],
    PRIMEM[""Paris RGS"",2.337208333333333,
        AUTHORITY[""EPSG"",""8914""]],
    UNIT[""grad"",0.01570796326794897,
        AUTHORITY[""EPSG"",""9105""]],
    AUTHORITY[""EPSG"",""4901""]]

In [12]: SpatialReference(4901).geographic
Out[12]: True
}}}"	Cleanup/optimization	closed	GIS	1.10	Normal	fixed			Accepted	1	0	0	0	0	0