Re: [R-sig-Geo] RasterBrick: Change resolution, keep the values

[Rafael Wüest]

Hi Micheal,

I think you can use the raster::disaggregate function in this case, with 
method = ''

Check out ?disaggregate for more details.

HTH, Rafael


On 09.07.14 18:48, Michael Treglia wrote:
Hi Michael,

Looks like you're using the Raster package.  In that package, check out the
resample() function (
http://www.inside-r.org/packages/cran/raster/docs/resample) - looks like
that does what you want.

Make sure both layers are in the same projection - otherwise you can use
projectRaster() instead.

It looks like you haven't defined the projection for the second layer (as
listed above, "coord. ref. : NA") - do that first (use projection() [
http://www.inside-r.org/packages/cran/raster/docs/projection]).
Alternatively, you can define the projection on import with the raster()
command, using the "crs" argument.

Hope that helps.
Mike




On Wed, Jul 9, 2014 at 11:35 AM, Michael Peichl <michael.pei...@ufz.de>
wrote:

Dear all,

I would like to change the resolution of the following RasterBrick to 100,
100.

class       : RasterBrick
dimensions  : 225, 175, 39375, 720  (nrow, ncol, ncell, nlayers)
resolution  : 4000, 4000  (x, y)
extent      : 4038000, 4738000, 5220000, 6120000  (xmin, xmax, ymin, ymax)
coord. ref. : +proj=longlat +datum=WGS84 +ellps=WGS84 +towgs84=0,0,0
data source : /home/usr/Documents/projects/...
names       : X1, X2, X3, X4, X5, X6, X7, X8, X9, X10, X11, X12, X13, X14,
X15, ...
z-value     : 1, 720 (min, max)
varname     : varname

Thereby, the values of each Raster Cell on 4000,4000 resolution should be
allocated to 40x40 raster cellls, having the same value as the large cells.
I want to do this, because I want to use a raster on the more detailed
resolution as mask:

class       : RasterLayer
dimensions  : 9000, 7000, 6.3e+07  (nrow, ncol, ncell)
resolution  : 100, 100  (x, y)
extent      : 4038000, 4738000, 5220000, 6120000  (xmin, xmax, ymin, ymax)
coord. ref. : NA
data source : in memory
names       : layer
values      : 12, 12  (min, max)

Any recommendations?

Thanks a lot!

Sincerely
Michael

--

Dipl.-Vw. Michael Peichl
Ökonomie / Economics

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Helmholtz Centre for Environmental Research GmbH - UFZ
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Rafael Wüest
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http://www.rowueest.net

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