Thank you very much Robert.

Best,

Manuel

On 04/11/2010 10:46 a.m., Robert J. Hijmans wrote:
> Manuel,
>
> library(raster)
> # Assuming you have matrix of points (or SpatialPoints*)
> pt<- (cbind(runif(100), runif(100)) -0.5) * 500
> spt<- SpatialPoints(pt)
> # and a RasterLayer
> r<- raster()
>
> # you can do
>
> e<- polygonFromExtent(r)
> o<- overlay(e, spt)
> o<- which(!is.na(o))
> pts<- pt[o,]
>
>
> # show that it worked
> plot(pt)
> r[] = 1
> plot(r, add=TRUE, legend=FALSE)
> points(pt, col='blue')
> points(pts, col='red', pch=20)
>
>
> Robert
>
> On Thu, Nov 4, 2010 at 5:43 AM, Manuel Spínola<mspinola10@gmail.com>  wrote:
>> Dear list members,
>>
>> How can eliminate or dismiss points that do not "touch" my raster file?
>> This mean those points that are outside of the raster area.
>> When I have my plot of the rester and I draw the points:
>>
>> points (villages)
>>
>> some of them are outside of the raster not because an error but just
>> because the point file is bigger in extent than the raster.
>>
>> Thank you very much in advance.
>> Best,
>>
>> Manuel
>>
>>
>> --
>> *Manuel Spínola, Ph.D.*
>> Instituto Internacional en Conservación y Manejo de Vida Silvestre
>> Universidad Nacional
>> Apartado 1350-3000
>> Heredia
>> COSTA RICA
>> mspinola@una.ac.cr
>> mspinola10@gmail.com
>> Teléfono: (506) 2277-3598
>> Fax: (506) 2237-7036
>> Personal website: Lobito de río
>> <https://sites.google.com/site/lobitoderio/>
>> Institutional website: ICOMVIS<http://www.icomvis.una.ac.cr/>
>>
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>>
>>
>> _______________________________________________
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>>
>>


-- 
*Manuel Spínola, Ph.D.*
Instituto Internacional en Conservación y Manejo de Vida Silvestre
Universidad Nacional
Apartado 1350-3000
Heredia
COSTA RICA
mspinola@una.ac.cr
mspinola10@gmail.com
Teléfono: (506) 2277-3598
Fax: (506) 2237-7036
Personal website: Lobito de río 
<https://sites.google.com/site/lobitoderio/>
Institutional website: ICOMVIS <http://www.icomvis.una.ac.cr/>

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