[R-sig-Geo] How to resample a map using the statistical mode of class to fill the new pixel

[Tom Philippi]

Mel's answer is complete if you are aggregating to an integer multiple of
grid cells: if your tree cover was 5, 10, 25, 50, 125, etc., m pixels.  If
you are unlucky enough to have your tree cover in 15 or 30m pixels, you may
need to disaggregate to greatest common factor (5 or 10m) cells first, then
aggregate up to 250m MODIS.  With mode on categorical data, that should
still give you your expected results; with continuous raster values and
other functions, it might not be appropriate.

Tom 2


On Fri, Aug 26, 2016 at 7:28 PM, Bacou, Melanie <mel at mbacou.com> wrote:

> Isaque, check this thread on StackExchange:
> http://gis.stackexchange.com/questions/177423/r-aggregate-
> raster-with-mode-function-how-does-it-work
>
> --Mel.
>
>
> On 8/26/2016 10:07 PM, Isaque Daniel wrote:
> > Hi dear all,
> >
> >
> > I need to resample a tree cover map create by Landsat imagery to the
> MODIS 250 meters.
> >
> > If I use the resample function of raster package, it will compute the
> value based on bilinear or ngb, in this condition the new class map will
> not answer my expectations.
> >
> >
> > I loking for a way of resample using the statistical mode to define the
> value of the pixel of the new map.
> >
> >
> > Some tip about this?
> >
> > Thanks
> > Isaque
> >
> >
> >
> > ------------------------------------------------------------
> ------------------------------------------------------
> > Agronomist engineer
> > Master in Remote Sensing - National  Institute for Space Research (INPE)
> - Brazil
> > PHD Student in Transport - Bras�lia University (UNB)
> >
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> >
> >
> >
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