[R-sig-Geo] Multiplying a raster object
tyatabe at ucdavis.edu
Thu Feb 25 18:32:33 CET 2016
That helps a lot, actually. I used the wrong factor for transforming.
Still adding the values of my raster don't add up to the points of the
original ppp object. So I suppose there are better approaches than
multiplying the raster by factor. If someone else wants to chip in on this
it'll be great.
On Wed, Feb 24, 2016 at 4:56 AM, Loïc Dutrieux <loic.dutrieux at wur.nl> wrote:
> On 02/23/2016 09:22 PM, Tadaishi Yatabe-Rodriguez wrote:
>> Hi community,
>> I have a raster object of a kernel density, where the linear unit is
>> and when I plot it it gives me very small density values (units per sq
>> meter, I suppose). I figure that if I multiply it, say by a 1000, it will
>> give density values in units per sq km.
> I don't know much about kernel densities, but if you want to convert
> units/m^2 to units/km^2 you'd have to multiply by 1 000 000 instead of
> 1000. Hope that helps explaining the incoherence in your results.
> It looks good on the legend, but I
>> wonder: is this a correct thing to do? I wonder this because when I add
>> values of the raster it does not add up to the number of points in my
>> original ppp object from which I created the density.
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DVM, MPVM, PhD (C)
Center for Animal Disease Modeling and Surveillance (CADMS)
Department of Medicine and Epidemiology
School of Veterinary Medicine
University of California Davis
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