[gdal-dev] re-gridding to a coarser grid

[Etienne Tourigny]

The only option that you do *not* have is "mode" (the dominant value),
which can be useful in the case of categorical (integer) data.  That
question has been answered here:

http://www.osgeo.org/pipermail/gdal-dev/2011-August/029692.html

On Wed, Dec 14, 2011 at 1:35 PM, Travis Kirstine
<traviskirstine at gmail.com> wrote:
> Andreas,
>
> Yes gdalwarp support various resampling methods
>
> To use different resampling methods use the -r flag followed by the method
>
> eg
>
> gdalwarp -r near ..............
> gdalwarp -r bilinear .............
>
> etc...
>
>
>
>
> On 14 December 2011 08:26, Andreas H. <lists at hilboll.de> wrote:
>> Travis,
>>
>> thanks for your answer!
>>
>> Regarding the resampling methods: Do they all just interpolate the data? I
>> mean, when downsampling, usually I would use mean() or something similar
>> to fill the new (coarser) grid cells. Doas gdalwarp actually do this and
>> I'm not able to understand the documentation, or is it different?
>>
>> Thanks again!
>> Andreas.
>>
>>
>>> Andreas,
>>>
>>> gdalwarp can be used to resample images using the -tr flag or -ts flag.
>>>
>>> For example resample 1m image to 10m using cubic resampling and
>>> "target resolution'
>>>
>>> gdalwarp -r cubic -tr 10 10 input_1m.tif output_10m.tif
>>>
>>> You may have an issue determining the output resolution as I believe
>>> the resolution will be in decimal degrees rather than arc-seconds.
>>>
>>> Regards
>>>
>>> On 13 December 2011 14:52, Andreas H. <lists at hilboll.de> wrote:
>>>> Hi,
>>>>
>>>> let's say I have a GeoTIFF file with a global grid in a 30 arc-second
>>>> resolution. Which would be the appropriate GDAL command to spatially
>>>> down-sample this file to say 0.125°?
>>>>
>>>> Thanks for your insight,
>>>> Andreas.
>>>> _______________________________________________
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>>>> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>>>
>>
>>
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