-
From: r-sig-geo-boun...@stat.math.ethz.ch on behalf of alexander.h...@csiro.au
Sent: Wed 28.01.2009 01:10
To: r-sig-geo@stat.math.ethz.ch
Subject: [R-sig-Geo] calculate raster values based on vector regions
Hi List,
How would I go about assigning values to a raster based on polygon regions
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From: r-sig-geo-boun...@stat.math.ethz.ch
[mailto:r-sig-geo-boun...@stat.math.ethz.ch] On Behalf
Of alexander.h...@csiro.au
Sent: Wednesday, January 28, 2009 2:10 AM
To: r-sig-geo@stat.math.ethz.ch
Subject: [R-sig-Geo] calculate raster values based on vector regions
Hi List,
How
-Original Message-
From: r-sig-geo-boun...@stat.math.ethz.ch
[mailto:r-sig-geo-boun...@stat.math.ethz.ch] On Behalf
Of alexander.h...@csiro.au
Sent: Wednesday, January 28, 2009 2:10 AM
To: r-sig-geo@stat.math.ethz.ch
Subject: [R-sig-Geo] calculate raster values based on vector regions
...@stat.math.ethz.ch] On Behalf
Of Tomislav Hengl
Sent: Wednesday, January 28, 2009 9:56 AM
To: r-sig-geo@stat.math.ethz.ch
Cc: alexander.h...@csiro.au
Subject: Re: [R-sig-Geo] calculate raster values based on vector regions
Dear Herry,
If I understand what you problem, one solution is to use R
-Original Message-
From: r-sig-geo-boun...@stat.math.ethz.ch on behalf of alexander.h...@csiro.au
Sent: Wed 28.01.2009 10:37
To: r-sig-geo@stat.math.ethz.ch
Subject: Re: [R-sig-Geo] calculate raster values based on vector regions
Hi list,
I try to explain my problem a bit better.
1
: [R-sig-Geo] calculate raster values based on vector regions
Dear Herry,
If I understand what you problem, one solution is to use R+SAGA. You should
first convert the
polygon map to the same grid, and then you can load it to R and do any type of
aggregation:
library(maptools)
library(rgdal
: r-sig-geo@stat.math.ethz.ch
Subject: Re: [R-sig-Geo] calculate raster values based on vector regions
Alexander, below is a reproducible example that uses a polygon data set
from package maptools. You should read your polygons e.g. through
readOGR (package rgdal) and your grid through readGDAL
Hi List,
How would I go about assigning values to a raster based on polygon regions in
R. Examples would be most appreciated.
I have (vector) regions assigned to a specific value. The raster has NAs and
some pixels where these values are likely to occur on ground. I need to assign
these
