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How to trim an area in a general map?

How to trim an area in a general map?

How to trim an area in a general map?

(OP)
Hello all,
 
I have a GENERAL MATRIX MAP, in latitudes and longitudes coordinates.
 I would like to trim this map according to the latitude and
longitude vectors of a basin inside that zone.
 
I can't seem to do it with 'roipoly' because its not a REGULAR matrix
map, nor with 'maptrim' because its not a vector map.
 
Any clues?
 
Thanks a lot,
 
Bruno

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