[udig-users] Setting sub area of raster layers for processing

[pmanousos@xxxxxxxxxxxxxxxxxxx]

Greetings. In uDig v 1.4.0b is there a
way to interactively set the area of processing to perform calculations
via OmsMapCalc for a sub region in two raster layers of different resolution
(2km and 1/9 arc sec).  There are no parent vector files in the layer
list.  

We have searched on line and in the
archives and am unable to recognize a similar solution.  Nor does
it appear this is intrinsically possible via Selection Tool via Box Selection
or AOI selection sans shape file layer.  

Details (see small image attached)
Layer 1 = image file of topography 1/9
arc sec resolution over a small geographic area
Layer 2 = 2km raster of flood water
height from a hurricane (overlaps but does not contain fully the geographic
and smaller area of layer #1)

We wish to process data in a small overlapping
region of the two layers (simple layer 2 minus layer 1 calculation) --
not the entire region of layer 1 or layer 2

Pete

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