[R-sig-Geo] Spatial Downscaling in R

[Tomislav Hengl]

For downscaling, and especially if you work with relatively smooth 
surfaces and large rasters, I recommend using gdalwarp cubicspline 
technique e.g. (http://www.gdal.org/gdalwarp.html):

gdalwarp input.tif output.tif -r "cubicspline" -tr 250 250 -co 
"COMPRESS=DEFLATE"

If you prefer to do it via R command line then either use 
system('gdalwarp ...') or consider using 
https://cran.r-project.org/web/packages/gdalUtils/

SAGA GIS also has few similar options for downscaling 
(http://www.saga-gis.org/saga_tool_doc/2.3.0/grid_tools_0.html) and is 
efficient with large rasters (it can be easily parallelized).

T. Hengl

On 03/15/2018 09:34 AM, Bede-Fazekas Ákos wrote:
> Dear Milu,
> 
> You can use any spatial interpolation method as statistical downscaling 
> approach. See package gstat for IDW (inverse distance weighted) and 
> several types of kriging. In case of temperature, you might use 
> elevation data from a DEM or radiation data as auxiliary variables in 
> those interpolation methods (e.g. regression kriging) that can handle 
> auxiliary data.
> 
> HTH,
> Ákos Bede-Fazekas
> Hungarian Academy of Sciences
> 
> 
> 2018.03.14. 22:15 keltezéssel, Miluji Sb írta:
>> Thanks again! Looking into this right now.
>>
>> Sincerely,
>>
>> Milu
>>
>> On Wed, Mar 14, 2018 at 9:54 PM, Michael Sumner <mdsumner at gmail.com> 
>> wrote:
>>
>>> Try ClimDown package, otherwise more generally raster function
>>> disaggregate.
>>>
>>> Cheers
>>>
>>> On Thu, 15 Mar 2018, 06:53 Miluji Sb, <milujisb at gmail.com> wrote:
>>>
>>>> Dear all,
>>>>
>>>> Please forgive my inexperience with spatial downscaling. I am 
>>>> interested
>>>> in
>>>> spatial downscaling of global temperature to grid cell. Is there a 
>>>> package
>>>> in R that can perform this function?
>>>>
>>>> Any help/guidance will be highly appreciated.
>>>>
>>>> Sincerely,
>>>>
>>>> Milu
>>>>
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>>>>
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>>> -- 
>>> Dr. Michael Sumner
>>> Software and Database Engineer
>>> Australian Antarctic Division
>>> 203 Channel Highway
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>>>
>>> Kingston Tasmania 7050 Australia
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>>>
>>>
>>>
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