[R-sig-Geo] Problem to run a loop

[Tobias Vetter]

Sorry, but forget what I wrote before.
Tobias
> Hi,
> I have a problem to run a loop to extract pixel values. The name of my
> folder is: Image_Band_LST_2010. Names of images: LSR_279; LST_280; LST_281;
> etc.
> The extension of the image is (.tif)
> I use this code:
>
> library(raster)
> a<- NULL
> Result<- matrix(0,nrow=3,ncol=49)
> for(i in 279:327){
> a<- raster(paste("C:\\Users\\DISC D\\Image_Band_LST_2010\\LST_",i,sep=""))
> Result[1,i-278]<- extract(a, cbind(516689.3630,1689862.3777)) # plot 1
> Result[2,i-278]<- extract(a, cbind(452689.3630,1536862.3777)) # plot 2
> Result[3,i-278]<- extract(a, cbind(512689.3630,1415862.3777)) # plot 3
> }
>
> The result is:
> Erreur dans .rasterObjectFromFile(x, band = band, objecttype =
> "RasterLayer",  :
>    file: C:\Users\DISC D\Image_Band_LST_2010\LST_279 does not exist
>
> To solve the problem: I indicated the extension of images for instance:
> a<- raster(paste("C:\\Users\\DISC
> D\\Image_Band_LST_2010\\LST_.tif",i,sep=""))
>
> But the result is always bad.
> Can you help me to solve this ptroblem
>
> Komine
>
> --
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>
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