[Gvsig_english] xyz data

[Benjamin Ducke]

Hi Angus, please post: (a) an excerpt of
two or three lines of your input data, (b) the names
and values of all options you used to run r.in.ascii
(you can get the complete command line from the
SEXTANTE log viewer, page "GRASS output"), and (c)
the offending line #2091676.

There is no significant memory limitation for
r.in.ascii, as it only rasterizes one point at
a time.

Cheers,

Ben


On 06/03/2012 02:00 PM, Angus Jeffery wrote:
> 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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-- 
Benjamin Ducke
{*} Geospatial Consultant
{*} GIS Developer

   benducke at fastmail.fm