[Qgis-developer] Spatial reference systems and Area of applicability

[Werner Macho]

+1 for everything you said here .. that sounds wonderful .. being
warned if a reprojection does not make any sense is a huge usability
improvement for occassional GIS Users ..


On Thu, Apr 3, 2014 at 12:27 AM, Even Rouault
<even.rouault at mines-paris.org> wrote:
> Hi,
>
> This is something I discussed with Paolo during the past Code Sprint. In the
> original EPSG databases, there is an area of applicability defined as a
> bounding box in latitude,longitude for each spatial reference system. In the
> import process of the EPSG database used for libgeotiff, GDAL, proj.4 and
> PostGIS ( detailed in
> http://svn.osgeo.org/metacrs/geotiff/trunk/libgeotiff/csv/README ), that area of
> applicability is not currently imported in the .csv files concerning geographic
> or projected SRS (but they are imported for datum shift transforms).
>
> A potential improvement would be to add it and expose it in the GDAL
> OGRSpatialReference object, so that QGIS could benefit from it.
> This could be used for example :
> - to warn the user when reprojection to a SRS is completely or partially out
> of its area of applicability
> - to filter the SRS catalog to offer only the relevant SRS at a point or on a
> zone
> - ...
>
> Even
>
> --
> Geospatial professional services
> http://even.rouault.free.fr/services.html
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