[gdal-dev] Feature request: gauss and other interpolations in gdalwarp

[Etienne Tourigny]

Please upload your file to the ticket (or just a small subset if the file
is sensitive, or a way to generate a similar file, or send it to me).

It is probably because of the color table which I have not tested for.

Etienne


On Mon, Apr 8, 2013 at 3:17 AM, John Twilley <mathuin at gmail.com> wrote:

> Thank you, Etienne, for writing this code.  I greatly appreciate it!
>
> I updated my svn checkout, then applied your patch with no errors.  I
> tried to warp my landcover files which use color tables (which is why mode
> is so important to me) and they did not work.  Here is the output:
>
> jmt at nala:~/git/mathuin/TopoMC$ /home/jmt/svn/gdal/apps/.libs/gdalwarp
> --debug -multi -tr 6 6 -te 2087232 2395968 2104512 2410176 -r mode
> regions/Provincetown/Datasets/L1L.tif L1L-new.tif
> Copying color table from regions/Provincetown/Datasets/L1L.tif to new file.
> Creating output file that is 2880P x 2368L.
> Processing input file regions/Provincetown/Datasets/L1L.tif.
> Warning: Input file regions/Provincetown/Datasets/L1L.tif has a color
> table, which will likely lead to bad results when using a resampling method
> other than nearest neighbour. Converting the dataset prior to 24/32 bit is
> advised.
> ERROR 5: GDALWarpOptions.Validate()
>   eResampleArg=6 is not a supported value.
> jmt at nala:~/git/mathuin/TopoMC$
>
> Let me know if I can provide any additional information to help you out!
>
> Jack.
>
> --
> mathuin at gmail dot com
>
>
> On Sun, Apr 7, 2013 at 1:19 PM, Etienne Tourigny <etourigny.dev at gmail.com>wrote:
>
>> I have implemented mode and average warping algorithms, based on those
>> used in overview creation.
>>
>> http://trac.osgeo.org/gdal/ticket/5049
>>
>> This code has been tested on a few datasets (see attachments) with all
>> datatypes (Byte, Int, Float) but not all cases have been looked into (e.g.
>> color tables, various projections).
>>
>> Any feedback and testing would be appreciated.
>>
>> Cheers
>> Etienne
>>
>>
>> On Wed, Mar 27, 2013 at 6:13 PM, John Twilley <mathuin at gmail.com> wrote:
>>
>>> I'm interested in this feature request as well.  Adding the mode
>>> resampling algorithm to gdalwarp would be very beneficial to my projects,
>>> right up there with being able to access the warp API from Python.  Is this
>>> at all possible?  Should I submit a feature request on Trac, or what?  Just
>>> let me know!
>>>
>>> Jack.
>>>
>>> --
>>> mathuin at gmail dot com
>>>
>>>
>>> On Mon, Feb 18, 2013 at 8:17 AM, Jan Hartmann <j.l.h.hartmann at uva.nl>wrote:
>>>
>>>>
>>>>  Hi devs,
>>>>
>>>> Would it be possible to add gauss and other interpolations to gdalwarp?
>>>> At the moment I georeference large scans to 2000*2000 tiles at the most
>>>> detailed scale, and then create 2000*2000 tiles at resolutions of 2, 4 6
>>>> etc  times the original scale, using gdaladdo and gauss or other
>>>> interpolations. It would help immensely if I could do that directly with
>>>> gdalwarp.
>>>>
>>>>
>>>> Funding would probably no problem. The question is: can and should it
>>>> be done?
>>>>
>>>> Jan
>>>>
>>>>
>>>>
>>>> _______________________________________________
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>>>> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>>>>
>>>
>>>
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>>
>>
>
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