Hello Mira,
The error you are getting is because for the SRTM height format you need to have very specific coordinates for the tiles. I'm not sure I can exactly explain why this is, but you need to have 1201x1201 for the 1 degree tiles. Also, you need to use the -projwin option to have the corners line up properly. Here is a command I used to generate 1 degree tiles for a similar problem as yours (i.e. taking another format DEM and making it look like SRTM) gdal_translate -of SRTMHGT -projwin 72 30 73.000139 28.9998611 SRTM_30m_ELLIPSOID_HGT_EXPANDED_MOSAIC_GEO N29E072.hgt You can see that the LR corner extends past 73/29 by one half an arc-second (.000139 degrees). This worked for my application and properly formatted the tiles. Hope this helps you sort out your problem. Thanks, Scott On Mon, Nov 7, 2011 at 4:24 PM, Jaromír Mikeš <[email protected]> wrote: > > Od: Scott Arko <[email protected]> > > Hello Scott, > > > To resample your data, you will need to call gdalwarp with the -tr > option. > > This is specified in whatever the native units are for your projection. > > In the case of UTM, meters. So, something like: > > > > gdalwarp -of SRTMHGT -tr 30 30 -r bilinear input.hgt output.hgt > > > > I see you also are using the -t_srs option. I find it best if you can > use > > the EPSG codes when using -t_srs. Something like > > > > gdalwarp -t_srs EPSG:13606 ..... > > > > 13606 is for UTM Zone 6N. Codes vary by zone. > > I can't find EPSG code for area I building map (18F, 19F - Patagonia) > So I am doing this now in my script: > > gdalwarp -of GTiff -srcnodata 32767 -t_srs "+proj=utm +zone=18F > +datum=WGS84" -rcs -order 3 -tr 30 30 -multi ASTGTM2_${tile}_dem.tif > ${tile}.tif > > this goes fine, but when I am trying then convert to hgt having errors: > > gdal_translate -of SRTMHGT ${tile}.tif ${tile}.hgt > > Warning 1: The corner coordinates of the source are not properly aligned > on plain latitude/longitude boundaries. > ERROR 1: Image dimensions should be 1201x1201 or 3601x3601. > > Any suggestion? > > Thank you > > mira > -- Scott Arko Alaska Satellite Facility Deputy Director University of Alaska Fairbanks 903 Koyukuk Drive Fairbanks, AK 99775 Phone: (907) 474 - 5570 email: [email protected] http://www.asf.alaska.edu/aadn
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