Roger Bivand wrote: > On Tue, 3 Apr 2007, temiz wrote: > > >> hello >> >> how can I confine a dataframe with a known polygon that is part of whole >> data ? >> > > Could I suggest following up this question on the R-sig-geo list? It is > not clear what you want to do - are the rows in the data frame points > which may lie inside or outside a polygon? If so, the overlay() methods in > the sp package may be suitable. > > >> regards >> >> >> > > thank you for your reply
I have not been aware of that list (R-sig-geo list) My data is elevation point data in a text file. I want to create DEMs with different interpolation methods for comparision. Actually I created DEM in GRASS using spline tension. Then I want to create DEM in R with different techniques to compare. But my data seems so huge for GSTAT-kriging and FIELDS-krig. So I decided to select smaller interpolation area within whole data. How can I define a subregion in which I do interpolation ? I found locator and chull function that may serve this. I will regard your recommendations. PS : Thinking facing a memory problem, I refrained from GRASS-R interface. -- Ahmet Temiz -- This message has been scanned for viruses and\ dangerous con...{{dropped}} ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.