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4 results for “from:Christian Levers”

raster package - zonal - standard deviations
Christian Levers · Nov 2, 2012 · r-sig-geo

Hello, I am using the raster package to calculate zonal statistics for my stack of ca. 50 rasters (each raster is about 33 mio. pixels) and I am wondering if there is a simple way to calculate standard deviations for...

Calculating spatial autocorrelation (Moran's I) when have zero-inflated data?
Christian Levers · Sep 26, 2011 · r-sig-geo

As far as I know that would be the Join Counts statistics. --> http://www.spatialanalysisonline.com/output/html/SpatialAutocorrelation.html Cheers, Christian Am 26.09.2011 06:57, schrieb Laura S: > Dear all: > > I was wondering if you have suggestions...

raster package - zonal - standard deviations
Christian Levers · Nov 6, 2012 · r-sig-geo

Thanks a lot Robert! Indeed it's (obviously) a matter of memory (although our server has approx 200GB RAM). While simulating RAM limitations, I obtain the same message: error in .local(x, z, ...) : stat can be 'sum', 'mean', 'min', or...

raster package - zonal - standard deviations
Christian Levers · Nov 5, 2012 · r-sig-geo

Hi Rafael, thanks for the quick reply. I'm using version 2.0-12, on a Win7 platform though. Since your little code works also fine for me, I guess its a matter of my input raster(s). Here is...

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