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CRS Compatibility Guide for Geospatial Python
==============================================
This is meant to be a guide to help you along the way of you use :class:`pyproj.crs.CRS`
with other Python Geospatial libraries.
.. note:: WKT2 is the best format for storing your CRS according to the
`PROJ FAQ <https://proj.org/faq.html#what-is-the-best-format-for-describing-coordinate-reference-systems>`__.
osgeo/gdal
----------
https://github.com/osgeo/gdal
Converting from `osgeo.osr.SpatialReference` to `pyproj.crs.CRS`
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. code-block:: python
from osgeo.osr import SpatialReference
from pyproj.crs import CRS
osr_crs = SpatialReference()
osr_crs.ImportFromEPSG(4326)
if osgeo.version_info.major < 3:
proj_crs = CRS.from_wkt(osr_crs.ExportToWkt())
else:
proj_crs = CRS.from_wkt(osr_crs.ExportToWkt(["FORMAT=WKT2_2018"]))
Converting from `pyproj.crs.CRS` to `osgeo.osr.SpatialReference`
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. warning:: WKT2 is only supported in GDAL 3+
.. code-block:: python
import osgeo
from osgeo.osr import SpatialReference
from pyproj.crs import CRS
from pyproj.enums import WktVersion
proj_crs = CRS.from_epsg(4326)
osr_crs = SpatialReference()
if osgeo.version_info.major < 3:
osr_crs.ImportFromWkt(proj_crs.to_wkt(WktVersion.WKT1_GDAL))
else:
osr_crs.ImportFromWkt(proj_crs.to_wkt())
rasterio
--------
https://github.com/mapbox/rasterio
Converting from `rasterio.crs.CRS` to `pyproj.crs.CRS`
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
If you have `rasterio >= 1.0.14`, then you can pass in the `rasterio.crs.CRS`
directly::
import rasterio
import rasterio.crs
from pyproj.crs import CRS
with rasterio.Env(OSR_WKT_FORMAT="WKT2_2018"):
rio_crs = rasterio.crs.CRS.from_epsg(4326)
proj_crs = CRS.from_user_input(rio_crs)
Otherwise, you should use the `wkt` property::
import rasterio.crs
from pyproj.crs import CRS
with rasterio.Env(OSR_WKT_FORMAT="WKT2_2018"):
rio_crs = rasterio.crs.CRS.from_epsg(4326)
proj_crs = CRS.from_wkt(rio_crs.wkt)
Converting from `pyproj.crs.CRS` to `rasterio.crs.CRS`
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. warning:: WKT2 is only supported in GDAL 3+
If you have rasterio >= 1.0.26 and GDAL 3+, then you can pass in the `pyproj.crs.CRS`
directly::
import rasterio.crs
from pyproj.crs import CRS
proj_crs = CRS.from_epsg(4326)
rio_crs = rasterio.crs.CRS.from_user_input(proj_crs)
If you want to be compatible across GDAL/rasterio versions, you can do::
from packaging import version
import rasterio
import rasterio.crs
from pyproj.crs import CRS
from pyproj.enums import WktVersion
proj_crs = CRS.from_epsg(4326)
if version.parse(rasterio.__gdal_version__) < version.parse("3.0.0")
rio_crs = rasterio.crs.CRS.from_wkt(proj_crs.to_wkt(WktVersion.WKT1_GDAL))
else:
rio_crs = rasterio.crs.CRS.from_wkt(proj_crs.to_wkt())
fiona
------
https://github.com/Toblerity/Fiona
Converting from `fiona` CRS to `pyproj.crs.CRS`
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Fiona currently stores the CRS as a PROJ string dictionary in the `crs`
attribute. As such, it is best to use the `crs_wkt` attribute.
It is also useful to know that plans exist to add CRS class.
Related GitHub issue `here <https://github.com/Toblerity/Fiona/issues/714>`__.
Example::
import fiona
from pyproj.crs import CRS
with fiona.Env(OSR_WKT_FORMAT="WKT2_2018"), fiona.open(...) as fds:
proj_crs = CRS.from_wkt(fds.crs_wkt)
Converting from `pyproj.crs.CRS` for `fiona`
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. warning:: WKT2 is only supported in GDAL 3+
If you want to be compatible across GDAL versions, you can do::
from packaging import version
import fiona
from pyproj.crs import CRS
proj_crs = CRS.from_epsg(4326)
if version.parse(fiona.__gdal_version__) < version.parse("3.0.0"):
fio_crs = proj_crs.to_wkt(WktVersion.WKT1_GDAL)
else:
# GDAL 3+ can use WKT2
fio_crs = dc_crs.to_wkt()
# with fiona.open(..., "w", crs_wkt=fio_crs) as fds:
# ...
geopandas
---------
https://github.com/geopandas/geopandas
Also see the `geopandas guide for upgrading to use pyproj CRS class <https://geopandas.readthedocs.io/en/latest/projections.html#upgrading-to-geopandas-0-7-with-pyproj-2-2-and-proj-6>`__
Preparing `pyproj.crs.CRS` for `geopandas`
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. code-block:: python
import fiona
import geopandas
from pyproj.crs import CRS
from pyproj.enums import WktVersion
proj_crs = CRS.from_epsg(4326)
if version.parse(geopandas.__version__) >= version.parse("0.7.0"):
# geopandas uses pyproj.crs.CRS
geo_crs = proj_crs
elif version.parse(geopandas.__version__) >= version.parse("0.6.0"):
# this version of geopandas uses always_xy=True so WKT version is safe
if version.parse(fiona.__gdal_version__) < version.parse("3.0.0"):
geo_crs = proj_crs.to_wkt(WktVersion.WKT1_GDAL)
else:
# GDAL 3+ can use WKT2
geo_crs = dc_crs.to_wkt()
else:
geo_crs = dc_crs.to_proj4()
`geopandas` to `pyproj.crs.CRS`
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
:meth:`pyproj.crs.CRS.from_user_input` can handle anything across the `geopandas`
versions. The only gotcha would be if it is `None`.
.. code-block:: python
import geopandas
from pyproj.crs import CRS
gdf = geopandas.read_file(...)
proj_crs = CRS.from_user_input(gdf.crs)
cartopy
-------
https://github.com/SciTools/cartopy
.. note:: These examples require cartopy 0.20+
Preparing `pyproj.crs.CRS` for `cartopy.crs.CRS`
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. warning:: This only works for CRS created with WKT2,
PROJ JSON, or a spatial reference ID (i.e. EPSG)
with the area of use defined. Otherwise,
the x_limits and y_limits will not work.
.. code-block:: python
import cartopy.crs as ccrs
from pyproj.crs import CRS
# geographic
proj_crs = CRS.from_epsg(4326)
cart_crs = ccrs.CRS(proj_crs)
# projected
proj_crs = CRS.from_epsg(6933)
cart_crs = ccrs.Projection(proj_crs)
Preparing `cartopy.crs.CRS` for `pyproj.crs.CRS`
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. note:: `cartopy.crs.CRS` inherits from `pyproj.crs.CRS`,
so it should behave like a `pyproj.crs.CRS`.
.. code-block:: python
from cartopy.crs import PlateCarree
from pyproj.crs import CRS
cart_crs = PlateCarree()
proj_crs = CRS.from_user_input(cart_crs)
pycrs
-----
https://github.com/karimbahgat/PyCRS
.. warning:: Currently does not support WKT2
Preparing `pyproj.crs.CRS` for `pycrs`
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. code-block:: python
import pycrs
from pyproj.crs import CRS
proj_crs = CRS.from_epsg(4326)
py_crs = pycrs.parse.from_ogc_wkt(proj_crs.to_wkt("WKT1_GDAL"))
Preparing `pycrs` for `pyproj.crs.CRS`
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. code-block:: python
import pycrs
from pyproj.crs import CRS
py_crs = pycrs.parse.from_epsg_code(4326)
proj_crs = CRS.from_wkt(py_crs.to_ogc_wkt())
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