[gdal-dev] "Nested" vrts?

[Andre Joost]

Am 24.09.2015 um 16:43 schrieb Jonathan Greenberg:
> Folks:
>
> Is it possible to create a vrt comprised of other vrts?  For a mosaicking
> problem, say I want to first trim the margins of the individual tiles by a
> certain number of pixels -- I can, of course, gdal_translate this but this
> adds a bunch of new files/processing time -- can I use gdalbuildvrt to
> first set a new te for each individual tile, and then feed these vrts into
> another gdalbuildvrt for mosaicking them?
>

I did something similar to mosaic cadastral maps for gdal2tiles:

for %%N in (D:\Karten\gdal\gdal2tiles\NL25\*.tif) DO gdal_translate -of 
vrt -expand rgba %%N D:\Karten\gdal\gdal2tiles\NL25\%%~nN.vrt
gdalbuildvrt -allow_projection_difference index25.vrt NL25\*.vrt

The first step expands paletted colours to RGB into one vrt per source 
file, the second mosaics them together.

HTH,
André Joost