[Proj] gdalwarp EPSG:32662 problem

[support.mn at elisanet.fi]

Hello,

the new version of proj.4 does not make any datum or ellipsoidal
shift if not both source and destination datums are defined.. the older
version did some other assumptions.. this is the most often reason
for some shifts between versions.

see also:
http://comments.gmane.org/gmane.comp.gis.proj-4.devel/6045

Regards: Janne.

---------------------------------------------------------------------------------------


Stephen Woodbridge [woodbri at swoodbridge.com] kirjoitti: 
> Hi,
> 
> Sorry for cross posting. This seems like a proj4 issue but might be gdal 
> related.
> 
> I've run into a problem that I think is related to a change in the EPSG 
> definition for EPSG:32662
> 
> The symptom is that the image after gdalwarp reprojection is about 20km 
> south of where it should be.
> 
> old system is correctly aligned:
> 
> GDAL 1.4.2.0, released 2007/06/27
> proj Rel. 4.5.0, 22 Oct 2006
> 
> # WGS 84 / Plate Carree
> <32662> +proj=eqc +lat_ts=0 +lon_0=0 +x_0=0 +y_0=0 +ellps=WGS84 
> +datum=WGS84 +units=m +no_defs  <>
> 
> new system is shifted about 20km south:
> 
> GDAL 1.9.2, released 2012/10/08
> proj Rel. 4.8.0, 6 March 2012
> 
> # WGS 84 / Plate Carree (deprecated)
> <32662> +proj=eqc +lat_ts=0 +lat_0=0 +lon_0=0 +x_0=0 +y_0=0 +datum=WGS84 
> +units=m +no_defs  <>
> 
> 
> http://spatialreference.org/ref/epsg/32662/
> This indicates that the definition in proj 4.8.0 is wrong. Would the 
> +ellps=WGS84 account for this shift?
> 
> Any thoughts on this?
> 
> Thanks,
>    -Steve
> _______________________________________________
> Proj mailing list
> Proj at lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/proj
>