Roger André wrote:
Hi All,
I'd like to control the order in which overlapping images are displayed
in a mosaic. Is it possible to do that by using a VRT, and altering the
order in which the files are defined in it?
The online doc for gdalbuildvrt states, "If there is some amount of
spatial overlapping between files, the order may depend on the order
they are inserted in the VRT file, but this behaviour should not be
relied on."
Not sure if this disclaimer is for the gdalbuildvrt utility, or
describes the generic behavior of a raster VRT.
Roger,
I believe the statement applies to the VRT format itself. I have looked
at the code, and it always applies them linearly based on the order they
appear in the .VRT list of sources. I think you could depend on it "for now"
though in a future version we might do something more fancy that would
result in alternate ordering.
Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, [email protected]
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent
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