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reading portions of a large binary file [message #74272]

Sat, 08 January 2011 04:59

oxfordenergyservices is currently offline

oxfordenergyservices
Messages: 56
Registered: January 2009

Member

Hi

I have a large (4GB file) which is basically a large 2-D matrix of
elevations. I want to read just some portion of this file
(representing a lat/long box). I could read in the whole file line by
line (because it is too big for RAM) and just take out the relevant
bits, or preferably I want it to only read off the disc the relevant
bits of the file. Is this possible in IDL? I vaguely remember this
being possible in fortran but can't find it by googling.

Thanks

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