[gdal-dev] OGRSpatialReference::IsSame returning TRUE unexpectedly

[Even Rouault]

On mardi 5 septembre 2017 20:21:17 CEST Matthew Amato wrote:
> Thanks for the detailed write up and quick fix!
> 
> Just to clarify your last sentence, are you saying there are still
> potential cases where IsSame returns TRUE when it shouldn't? 

Hopefully not.

> I'm just wondering if I should ditch my optimization of checking
> the spatial reference and always do a reproject (via VRT) even if it
> results in a no-op in some cases.  I assume the overhead of a no-op VRT is
> fairly small and I'm concerned with correctness more than anything else.

If "same for reprojection" is what matters for you, a safe way of checking is calling 
exportToProj4() on both SRS and checking for equality on the returned strings.

-- 
Spatialys - Geospatial professional services
http://www.spatialys.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20170906/7404b90f/attachment.html>