Hi Daniel,

> http://public.campingfools.com/wiki/show_image.php?name=NAD27_w_conus.jpg
> 
> The offset for this benchmark is 6m east and 15m north, better but not
> great. 
> However, other benchmarks are dead on.

For these offsets there is another issue known to me. However as all other 
benchmarks are correct I doubt it applies. But you might check. Start GT from 
console. It should output this:

------------ 4506687.439892 5432922.567629
------------  +proj=tmerc +lat_0=0 +lon_0=12 +k=1 +x_0=4500000 +y_0=0 
+ellps=bessel +datum=potsdam +units=m +no_defs +towgs84=606.0,23.0,413.0
------------ 4506687.439892 5432922.567629
------------  +proj=tmerc +lat_0=0 +lon_0=12 +k=1 +x_0=4500000 +y_0=0 
+ellps=bessel +datum=potsdam +units=m +no_defs +towgs84=606.0,23.0,413.0

That is two times the same. If it is not you have one of that few peculiar Qt 
installations that interfere with Proj4. I never found out what's happening 
exactly, but I guess QApplication messes up some path for Proj4. The only help 
in this case is to install a more recent Qt version.

> 
> Thanks for the help.  Have you started a FAQ on your website yet?

No, that is badly missing. My dream is to have something like a Wiki for such 
things that is integrated into the static pages at qlandkarte.org. However I do 
not like the commonly used Wiki packages. They all look bad and are hard to 
edit. Joomla seems to have some Wiki stuff too, but I had no time check. 

Next to a FAQ a page collecting tips and tricks for the GDAL tools on how to 
prepare raster map, SRTM and other for the use with QLandkarte would be fine, 
too. Your little script would fit in there perfectly. 

Oliver






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