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

[Andreas H.]

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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>