[gdal-dev] New user query about OGR library NTF import

[Frank Warmerdam]

Alex,

Can you provide access to an example file?  If
distribution is an issue, you can make it available just
to me.

Best regards,

On Sat, Nov 14, 2009 at 1:10 PM, A.J. Carter <ajc200 at maths.leeds.ac.uk> wrote:
> Hello,
>
> I was hoping someone might be able to help me with a query about using the
> OGR library to read an Ordnance Survey Landform Profile file in NTf format:
>
> http://www.ordnancesurvey.co.uk/oswebsite/products/landformprofile/techinfo.html
>
> The file contains a 501 X 501 grid with height values at each point. From
> the technical reference on the OS web page it lists this as being stored
> within a field called Z_COORD. Manually inspecting the NTF file (which is
> plain text) I can see values like 00159 meaning 15.9m AOD. If I run the NTF
> through OGRINFO -al on the file produces a feature for this point:
>
> OGRFeature)DTM_SD19SW):1
>  HEIGHT (Integer) = 15
>  POINT (310000.0 490000.0 15.899999618530273)
>
> At the moment I can't understand why it's writing out the height as an
> integer, and also where the many decimal places in the z coordinate of the
> point have come from.
>
> Any help would be much appreciated.
>
> I'm relatively new to GIS software; sorry if this is a silly question!
>
> Many thanks,
> Alex
> _______________________________________________
> gdal-dev mailing list
> gdal-dev at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>



-- 
---------------------------------------+--------------------------------------
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