[mapserver-users] Rewarping/Reprojection with GDAL and -wo EXTRA_SOURCE parameter

[Heiko Schröter]

Thanks for the hint, but sorry no, does not change rewarping behaviour 
of POLYGON or LINE Layers.
Distortion and missing parts do remain.

The odd thing:
The projection of all layers is ok if the BBOX equals or is greater than 
max extension of the map.
i.e. BBOX=-6500000,-6500000,6500000,6500000 [proj=ortho units=m]
By "zooming" in i.e. reducing the BBOX the RASTER layer rewarps ok, 
POLYGON and LINE layers do not.


Am 17.12.2013 16:11, schrieb Eichner, Andreas - SID-NLKM:
> Looks like that causes the same effect as setting
>    PROCESSING "LOAD_WHOLE_IMAGE=YES"
>
>> -----Ursprüngliche Nachricht-----
>> Von: mapserver-users-bounces at lists.osgeo.org [mailto:mapserver-users-
>> bounces at lists.osgeo.org] Im Auftrag von Heiko Schröter
>> Gesendet: Dienstag, 17. Dezember 2013 14:09
>> An: mapserver-users at lists.osgeo.org
>> Betreff: [mapserver-users] Rewarping/Reprojection with GDAL and -wo
>> EXTRA_SOURCE parameter
>>
>> To make use of it in mapserver a hint has been given in an old
>> mailing
>> thread (sorry, lost the source) to adjust the following code snippet
>> in
>> resample.c:
>>
>> Version: mapserver-6.4.0
>> resample.c
>> <snip>
>> /* ------------------------------------------------------------------
>> -- */
>>     /*      Project desired extents out by 2 pixels, and then strip
>> to      */
>>     /*      available
>> data.                                                 */
>>     /*
>> --------------------------------------------------------------------
>> */
>>     memcpy( &sOrigSrcExtent, &sSrcExtent, sizeof(sSrcExtent) );
>>     sSrcExtent.minx = floor(sSrcExtent.minx-1.0);
>>     sSrcExtent.maxx = ceil (sSrcExtent.maxx+1.0);
>>     sSrcExtent.miny = floor(sSrcExtent.miny-1.0);
>>     sSrcExtent.maxy = ceil (sSrcExtent.maxy+1.0);
>> <snap>
>>
>> Changing the -/+1.0 to -/+1250.0, for example, warps the RASTER image
>> correctly.
>>
>


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Dipl.-Ing. Heiko Schröter
Institute of Environmental Physics (IUP)   phone: ++49-(0)421-218-62092
Institute of Remote Sensing (IFE)          fax:   ++49-(0)421-218-62070
University of Bremen (FB1)
P.O. Box 330440               email:  schroete at iup.physik.uni-bremen.de
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