I posted this originally on github, but have moved it here at Sean's request. Additional details of this question/issue are discussed in the `pyproj` repository [here](https://github.com/pyproj4/pyproj/issues/357).

 

I discovered that `nsper` and `ob_tran` projections required the `+wktext` parameter to be accepted by rasterio's `CRS` objects. It wasn't a big deal to add this until recently where I started using pyproj's `CRS` objects as my library's container for CRS information. Using pyproj 2.0+ and its `CRS` objects, the `+wktext` of my PROJ dictionary is being ignored/removed. This means that doing `rasterio.crs.CRS.from_dict(CRS.to_dict())` fails because rasterio needs the `+wktext` parameter.

 

I'm not sure if this should be considered a bug in pyproj or in rasterio or not a bug at all. I found the related issues in this repository that mentioned `+wktext` but I had trouble understanding what it was for and why it was needed. Any help and information would be appreciated.

 

## Examples

 

from pyproj import CRS                                                                                                                                                            

from rasterio.crs import CRS as rioCRS                                                                                                                                            

 

proj_dict = {'proj': 'ob_tran', 'o_proj': 'eqc', 'o_lat_p': 30.0, 'o_lon_p': 10.0, 'lon_0': -10.0, 'a': 6371000.0, 'b': 6371000.0, 'wktext': True}

 

CRS.from_dict(proj_dict).to_dict()                                                                                                                                                

# {'proj': 'ob_tran', 'o_proj': 'eqc', 'o_lat_p': 30.0, 'o_lon_p': 10.0, 'lon_0': -10.0, 'a': 6371000.0, 'b': 6371000.0, 'type': 'crs'}

 

rioCRS.from_dict(proj_dict)                                                                                                                                                       

# CRS.from_wkt('PROJCS["unnamed",GEOGCS["unnamed ellipse",DATUM["unknown",SPHEROID["unnamed",6371000,0]],PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433]],PROJECTION["custom_proj4"],EXTENSION["PROJ4","+proj=ob_tran +o_proj=eqc +o_lat_p=30.0 +o_lon_p=10.0 +lon_0=-10.0 +a=6371000.0 +b=6371000.0 +wktext=True"]]')

 

rioCRS.from_dict(CRS.from_dict(proj_dict).to_dict()) 

# CRSError: The PROJ4 dict could not be understood. OGR Error code 5