pyproj-capabilities.md

import pyproj
from pyproj import CRS, Transformer
from pyproj.exceptions import CRSError, ProjError

# PROJ version (string and tuple)
print(pyproj.proj_version_str)   # e.g. "9.6.0"
print(pyproj.PROJ_VERSION)       # (9, 6, 0)
# full diagnostics: pyproj version, PROJ version, data dir, etc.
pyproj.show_versions()

# is a projection/CRS supported? -- just try to build it
def crs_ok(user_input):
    try:
        CRS.from_user_input(user_input)
        return True
    except CRSError:
        return False

crs_ok("EPSG:3031")                                   # True
crs_ok("+proj=laea +lat_0=-90 +datum=WGS84")           # True
crs_ok("+proj=spilhaus")                            # False

# is a specific +proj method known to this PROJ build?
from pyproj.list import get_proj_operations_map
ops = get_proj_operations_map()
"laea" in ops, "ortho" in ops, "peirce_q" in ops       # peirce_q needs PROJ >= 9.4

# can PROJ actually build a transformation between two CRS?
def transform_ok(src, dst):
    try:
        Transformer.from_crs(src, dst, always_xy=True)
        return True
    except (CRSError, ProjError):
        return False
        

i.e.

docker run --rm -ti ghcr.io/hypertidy/gdal-r-python
── ghcr.io/hypertidy/gdal-r-python ──
GDAL 3.13.3   PROJ 9.9.0   GEOS 3.15.0
R    4.6.1
Py   3.12.3   numpy 2.5.3   pyarrow 25.0.1 (libarrow 25.0.1)

Docs: https://github.com/hypertidy/gdal-r-ci#gdal-r-python
root@be9bc9ac06ba:/workspace# python
Python 3.12.3 (main, Aug 31 2026, 10:18:26) [GCC 13.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pyproj
>>> from pyproj import CRS, Transformer
>>> from pyproj.exceptions import CRSError, ProjError
>>>
>>> # PROJ version (string and tuple)
>>> print(pyproj.proj_version_str)   
9.9.0
>>> print(pyproj.PROJ_VERSION)       
(9, 9, 0)
>>> # full diagnostics: pyproj version, PROJ version, data dir, etc.
>>> pyproj.show_versions()
pyproj info:
   pyproj: 3.8.0
PROJ (runtime): 9.9.0
PROJ (compiled): 9.9.0
 data dir: /usr/local/share/proj
user_data_dir: /root/.local/share/proj
PROJ DATA (recommended version): 1.25
PROJ Database: 1.7
EPSG Database: v13.102 [2026-08-27]
ESRI Database: ArcGIS Pro 3.6 [2025-12-01]
IGNF Database: 3.1.0 [2019-05-24]

System:
   python: 3.12.3 (main, Aug 31 2026, 10:18:26) [GCC 13.3.0]
executable: /opt/gdal-py/bin/python
  machine: Linux-6.8.0-138-generic-x86_64-with-glibc2.39

Python deps:
  certifi: 2026.7.22
   Cython: 3.3.0
setuptools: 84.0.0
      pip: 26.2.1
>>>
>>> # is a projection/CRS supported? -- just try to build it
>>> def crs_ok(user_input):
...     try:
...         CRS.from_user_input(user_input)
...         return True
...     except CRSError:
...         return False
...
crs_ok("EPSG:3031")                                   
#True
crs_ok("+proj=laea +lat_0=-90 +datum=WGS84")           
#True
crs_ok("+proj=spilhaus")  
#True


transform_ok("EPSG:4326", "+proj=spilhaus +lon_0=147 +lat_0=-42")
#True