[Proj] Dutch correction grid

[Frank Warmerdam]

> 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?

Jan,

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
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent