Hi List.

I’m 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 don’t 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 don’t know how to use the function resources
properly. I’m 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:r.aluizio@gmail.com> Rodrigo Aluizio

Centro de Estudos do Mar/UFPR
Laboratório de Micropaleontologia
Avenida Beira Mar s/n - CEP 83255-000
Pontal do Paraná - PR - Brasil




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