Hi, Thanks for the suggestions. I had to buffer the mask. After, I clipped the raster with the new mask. Worked for me!
Thank you very much! 2012/11/22 Peter Halls <[email protected]> > Alisson, > > the advice I give my students in such a circumstance is to buffer the > boundary by either one half of the pixel size or by the pixel size. This > has the effect of increasing the mask to include all cells along the > boundary and gain a closer equivalent of a vector clip. > > For another discussion of the issues, see Burrough, P.A., and > McDonnell, Rachael A., 1998, Principles of Geographic Information Systems, > Oxford: OUP. > > Best wishes, > > Peter > > > On 22 November 2012 14:02, Joaquim Luis <[email protected]> wrote: > >> Alisson, >> >> It's not so easy to follow what is "desired" and "not-desired". For an >> excellent discussion of the details involved in such operations see >> >> http://blogs.mathworks.com/steve/2006/12/22/poly2mask-and-roipoly-part-3/ >> >> As a solution for your 'wish-behavior' case maybe what you can do is to >> previously expand your polygon with a buffer of half cell width. >> >> Joaquim >> >> Hi friends, >> >> By using gdalwarp to clip a raster with a mask (shape), I get a new >> raster of smaller size, which is the boundary of the polygon shape (mask). >> However, the pixels do not pass the polygon. I would like to pass the >> pixels just a little of the polygon mask. >> >> For clarity, I send two pictures of what I desire and not desire: >> http://postimage.org/image/hlrc3911z/ >> http://postimage.org/image/4vn3q5t3r/ >> >> The used command is: gdalwarp -dstnodata 0 -q -cutline >> C:/Users/Hugo/Final.shp -crop_to_cutline -of GTiff >> C:/Users/Hugo/Elevation-DEM-CLIPPED.img >> C:/Users/Hugo/Elevation-DEM-CLIPPED.img >> >> Can you help me? >> >> Best Regards, >> -- >> Alisson Barbosa >> Systems Analyst - FUNCEME >> M.Sc. in Computer Science - MACC >> Graduate in Computer Science - UECE >> >> >> >> >> _______________________________________________ >> gdal-dev mailing >> [email protected]http://lists.osgeo.org/mailman/listinfo/gdal-dev >> >> >> >> _______________________________________________ >> gdal-dev mailing list >> [email protected] >> http://lists.osgeo.org/mailman/listinfo/gdal-dev >> > > > > -- > > ---------------------------------------------------------------------------------------------------------------- > Peter J Halls, GIS Advisor & Team Leader Applications Support and > Training, > Information Directorate, University of York > Telephone: 01904 323806 Fax: 01904 323740 > Snail mail: Harry Fairhurst Building, University of York, > Heslington, York YO10 5DD > This message has the status of a private and personal communication > > ---------------------------------------------------------------------------------------------------------------- > > > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev > -- Alisson Barbosa Systems Analyst - FUNCEME M.Sc. in Computer Science - MACC Graduate in Computer Science - UECE
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