Hi List. Im trying to import only a part of interest from a raster image map (let say, ETOPO 1 Global Relief GeoTiff). I realize that, PROBABLY, the readGDAL function can deal with my issue through the arguments:
offset - Number of rows and columns from the origin (usually the upper left corner) to begin reading from; presently ordered (y,x) - this may change region.dim - The number of rows and columns to read from the dataset; presently ordered (y,x) - this may change But, I dont know exactly how to specify that I want the rows (and columns?) which show only South America, I do know the SA coordinate limits, but not the corresponding rows. The real problem is that I dont know how to use the function resources properly. Im trying to limit the region during import to avoid memory limit issues, once importing the ETOPO 1 Geotiff tries to generate a huge vector. Really Sorry About It, Thanks for Your Patience and Attention. ------------------------------------------------------------- MSc. <mailto:[email protected]> Rodrigo Aluizio Centro de Estudos do Mar/UFPR Laboratório de Micropaleontologia Avenida Beira Mar s/n - CEP 83255-000 Pontal do Paraná - PR - Brasil [[alternative HTML version deleted]]
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