[gdal-dev] How to generate tiles with multiple vrt's using GDAL

[Vaish]

Hi,
  How can I generate tiles using multiple VRT'S without any tranparent gaps 
using gdal commands.

1. When I run the gdal2tiles command on the first VRT , it works well but when
I run gdal2tiles command on the second VRT and point to the same outfput
folder. The tiles are overwritten.

I do not want to merge files because it takes time . Need to do this for an
ongoing project. So everyday I can make VRT's and append to it.

Can anyone suggest a soloution to this?

Thanks,
Vaish