Ah @jtratner I think my comment was misleading (poor choice of language, my bad)... I meant to say, checking for crs differences as you've done here *is* important... I'm just wondering if `pyproj` or `ogr` provide useful facilities for checking more thoroughly than the simple direct approach here. #65 is a good example of the potential problem. I don't think `pyproj` can do what we want, so we either need to implement it ourselves, or use `ogr`, which does have some facilities for conversion to a common format(s) for comparison...