[gdal-dev] Determining which .img subimage .OVR and .RRD pyramid go with

[jbu311]

Hi all,

I am trying to associate my .OVR (or RRD) pyramid file with its .img
counterpart.  Dealing with subimages is where it gets tricky.

As I understand it, <file_a>.ovr (or .rrd) is the pyramid file for <file_a>. 
So that's simple enough.  

However the problem is dealing with subimages.  My .img file has multiple
subimages.  How do I know which subimage the .ovr file goes with?  In my
particular file, each subimage looks exactly alike and as far as I can tell,
they are all identical.  In this case I might be able to assume the
.ovr/.rrd file can go with each and every subimage.  

But what if the .img file has multiple subimages that are all different? 
How do I know which the .ovr file goes with???

Please help me out.

Thanks in advance.

Julian
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