[Gvsig_english] xyz data

[Angus Jeffery]

Hi Ben
Thanks for such a quick reply. I created the required header rows for
r.in.ascii and but when I run it I am getting a consistent error
message: "Data conversion failed at row 2091676, col 1". I looked at
the data in this row and there is nothing different to any other
record. Could this be a memory issue, is there a limit to how many
points can be processed this way? What else should I check?
Best regards
Angus

On 3 June 2012 11:47, Benjamin Ducke <benducke at fastmail.fm> wrote:
> Use the r.in.ascii GRASS module from within
> SEXTANTE to directly rasterize the data.
> That way, you can deal with millions of data
> points without having to go through memory
> and CPU intensive operations, such as building
> vector points and interpolating them back to
> a raster.
>
> Ben
>
> On 06/03/2012 12:17 PM, Angus Jeffery wrote:
>> Morning
>> I want to work out an effective workflow for getting a large quantity
>> of ascii .xyz data (point elevation data) into gvSIG - I estimate
>> roughly 7 million points, with end use intended to be raster map in
>> gvSIG or vector for export to other software (e.g. .dxf file showing
>> elevation contours). Has anyone undertaken a similar task or does
>> anyone have any ideas of a sensible workflow using gvSIG/grass modules
>> please?
>> As an alternative to using all the data, does gvSIG have an effective
>> way of subsampling, so reducing the data to be processed and speeding
>> up the process, accepting lower accuracy?
>> Best regards
>> Angus
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>
>
> --
> Benjamin Ducke
> {*} Geospatial Consultant
> {*} GIS Developer
>
>   benducke at fastmail.fm
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