[gdal-dev] gdalwarp reprojection problem

[Ralf Suhr]

Hi Heng,

use gdal version 1.8.

Your srs definition has to be "+proj=utm +datum=WGS84 +zone=32 +towgs84=0,0,0 
+wktext".

Gr
Ralf

Am Mittwoch 16 Februar 2011, 08:28:12 schrieb heng.feng:
> Hi there,
> 
> When I tried to use GDALWARP to do the re-projeciton on some large GeoTiff
> data, the output pictures seemed to contain the gaps, which appeared to be
> a few horizontal lines when zooming out. The command I was using is
> something like this:
> gdalwarp --config GDAL_CACHEMAX 250 -wm 250 -co TILED=YES -co COMPRESS=LZW
> -s_srs "+proj=tmerc +lat_0=0 +lon_0=12 +k=1.000000 +x_0=4500000 +y_0=0
> +ellps=bessel +datum=potsdam +nadgrids=c:\fh\BETA2007.gsb,null +units=m
> +wktext" -t_srs "+proj=utm +datum=WGS84 +zone=32"
> "Z:\JBRoadMaps100\100\100.tif" "Z:\JBRoadMaps100\100\100_converted.tif"
> 
> This problem seems to be only happening to the large data as I have used
> the same GDALWARP command on the smaller data and everything was working
> fine (with no gap at all). Also the bigger is the data, more gaps/lines
> the output picture will have. I have also tried to increase/decrease
> GDAL_CACHEMAX and –wm values and it does not make any difference (the same
> amount of gaps still exists in the same output data).  I suspect this
> problem is caused by the option “-co TILED=YES”, but once I removed this
> option, the re-projection process was hanging. Moving the map data onto the
> local disk does not ease this problem either.
> 
> Can anyone here give me some help regarding this problem?
> 
> Thanks,
> Heng