Fala Éder... muito bom Abraço Hélio 2013/12/28 Eder Comunello [via R-br] < ml-node+s2285057n4661367h45@n4.nabble.com>
Alexandre,
Atualizei seu CMR, adicionando as últimas linhas para realizar o recorte com um polígono irregular.
### <code r> require(sp); require(rgdal); require(raster)
## Raster----------------------------------------------------------- set.seed(20131226) r <- raster(nc=100, nr=100) r <- setValues(r, round(runif(ncell(r))* 255)) image(r,col=gray(seq(0,1,0.025)))
## Borda ----------------------------------------------------------- x<-c(-125,-100,0,100,-125) y<-c(-49,25,0,-50,-49) limite<-cbind(x,y) lines(limite, col="yellow") ##
## Converte borda para SpatialPolygon spt.borda <- SpatialPolygons(list(Polygons(list(Polygon(limite)), "1")))
### Recorte do raster contido no interior da borda r.crop <- crop(r, spt.borda, snap='out') image(r.crop, asp=1)
### Recorte com polígono irregular! r.masked <- mask(r.crop, spt.borda) image(r.masked, asp=1) ### </code>
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