[Proj] Dutch correction grid

[Maxime SEGUIN]

Hi,

You can look at this spreadsheet :
http://lambert93.ign.fr/fileadmin/files/ntf_r93.pdf

Best regards,

Maxime SEGUIN


> On 11-04-08 11:28 AM, Jan Hartmann wrote:
>> I don't quite understand, Frank. I have a spreadsheet with four columns:
>> x, y,
>> correction for x and correction for y. What kind of raster file do I
>> need to
>> create with these data?
>
> Jan,
>
> As input we would require an input raster with two "bands" representing
> the
> offset in longitude and latitude.   I'm not sure off hand what the units
> are - possibly arcseconds?   The input file would need to be georeferenced
> in latitude and longitude.
>
> If your input points are sparse and irregular you could likely use
> gdal_grid to interpolate a grid from the point data.
>
> My point was mainly that you don't necessarily have to write an NTv2
> "writer" - it is sufficient to get the datum shift data into any GDAL
> support grid format.
>
> 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
>
> _______________________________________________
> Proj mailing list
> Proj at lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/proj
>