[FWTools] Extract to binary with meta, manipulate, then project

Simon Hook simon.j.hook at jpl.nasa.gov
Sun Feb 4 13:43:01 EST 2007

Hi Frank,

The processing I do will likely add or take away bands but the x and y 
dimensions of the image will stay the same. Assuming I can edit the .aux 
file (i.e. it is ascii rather than binary) that should work. Does the 
aux just use the 4 corners? I am not sure if you know this but ASTER 
files contain two arrays (1 lat, 1 lon), with points throughout the 
scene, that should be expanded to produce a lat/lon for each pixel. If 
you use the 4 corners, there will be some error because pixel spacing 
varies across the scene. Several programs ignore these arrays, e.g. 
ENVI. Also can you extract all the ASTER products, not just the 1B (I 
want to do some work with the emissivity product).

Best wishes, S.

Frank Warmerdam wrote:
> Simon Hook wrote:
>> Hi,
>> If I have an ASTER image, can I extract the bands as flat binary, 
>> including the geocoding info. Manipulate the flat binary with my code 
>> and then pass the manipulated binary (same size as original) with 
>> geocoding info to gdal and have it generate a geotif or jpg with 
>> world file?
> Simon,
> You can gdal_translate to a file format like PAux that produces a flat
> binary file + a header (.aux in this case).  Then you can do whatever
> you want to the binary file as long as it remains the same configuration.
> And later use the dataset as input to a translation to jpeg with world 
> file.
> Best regards,

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