[Proj] Dutch correction grid

Frank Warmerdam warmerdam at pobox.com
Fri Apr 8 14:34:19 EST 2011

> On 8-4-2011 19:09, Frank Warmerdam wrote:
>> Jan,
>> Ah, I had not paid close enough attention to realize the above. I think
>> it can still work if you convert the shifts into arcseconds. Note that
>> the shifts will be applied in PROJ.4 by converting to lat/long, applying
>> the shift, and shifting back. There may be some subtleties to how you
>> setup your coordinate system definitions to trigger proper use of the
>> NTv2 file.
> This agrees with the previous message by Maxime Sequin. Just to be sure: can I
> use either "@nadgrids=ntv2 binary file" or "@nadgrids=GDAL raster file"
> interchangeably?


PROJ.4 does not support other GDAL formats for the @nadgrids, but...

On 11-04-08 01:23 PM, Jan Hartmann wrote:
 > Yes, this looks like a detailed description of the NTV2 format. Do you
 > know a program to do the conversion, Maxime?
 > Jan

gdal_translate can be used to convert other grid formats into NTv2 format.
That was the point I've been trying to make!

Best regards,
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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and watch the world go round - Rush    | Geospatial Programmer for Rent

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