Hi,
  Is it possible to read geotiff data from standard input(STDIN) and write to 
standard output (STDOUT) instead of reading from a file? I see the following in 
the documentation to GDALOpen():

pszFilename the name of the file to access. In the case of exotic drivers this 
may not refer to a physical file, but instead contain information for the 
driver on how to access a dataset.

What options does Geotiff driver have for pszFilename? If I want to modify 
Geotiff driver to read and write from STDIN and STDOUT respectively, which 
files should I be looking at? 

Ability to do this might be useful if using GDAL in a Hadoop MapReduce job with 
streaming. Geotiff format could be the serialization format that MapReduce 
expects. If it is not already there, it might be useful to add this feature. It 
could make it a bit easier to use GDAL within a Cloud environment.  Thanks.

Upendra
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