Andrew,
Le 21/12/2023 à 13:55, Andrew C Aitchison via gdal-dev a écrit :
On Wed, 20 Dec 2023, Even Rouault via gdal-dev wrote:
Hi,
For those not actively following github tickets & PR, I just want to
point to a new pending major functionality to improve management of
virtual mosaics with a very large number of tiles/sources (> tens of
thousands of tiles), by referencing them as features of a vector
layer (typically created by gdaltindex), instead of a XML file as in
traditional VRT, augmented with additional metadata.
More details in https://github.com/OSGeo/gdal/pull/8983 (and in
initial ticket in https://github.com/OSGeo/gdal/issues/8861)
Am I right in thinking that all the tiles must have the same
bit-depth and colour interpretation
Yes. If different bit-depth and rescaling is wished, you'll have to
manually use for example
"vrt://the.tif?scale=src_min,src_max,dst_min,dst_max" as the source
name. Cf https://gdal.org/drivers/raster/vrt.html#vrt-connection-string
If bands are ordered differently, similarly use things like
"vrt://the.tif?bands=3,2,1" to reorder them in a uniform way.
and for paletted tiles
the same colour table ?
I've just added support for automatically expanding color tables to
RGB(A) if the BAND_COUNT metadata item is set to 3 or 4.
Even
--
http://www.spatialys.com
My software is free, but my time generally not.
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