Usage: gdalbuildvrt [--help] [--help-general]
                    [-tileindex <field_name>]
                    [-resolution {highest|lowest|average|user}]
                    [-te <xmin> <ymin> <xmax> <ymax>] [-tr <xres> <yres>] [-tap]
                    [-separate] [-b <band>]... [-sd <subdataset>]
                    [-allow_projection_difference] [-q]
                    [-addalpha] [-hidenodata]
                    [-srcnodata "<value>[ <value>]..."] [-vrtnodata "<value>[ <value>]..."
                    [-ignore_srcmaskband]
                    [-a_srs <srs_def>]
                    [-r {nearest|bilinear|cubic|cubicspline|lanczos|average|mode}]
                    [-oo <NAME>=<VALUE>]...
                    [-input_file_list <filename>] [-overwrite]
                    [-strict | -non_strict]
                    <output_filename.vrt> <input_raster> [<input_raster>]...

e.g.
  % gdalbuildvrt doq_index.vrt doq/*.tif
  % gdalbuildvrt -input_file_list my_list.txt doq_index.vrt

NOTES:
  o With -separate, each files goes into a separate band in the VRT band.
    Otherwise, the files are considered as tiles of a larger mosaic.
  o -b option selects a band to add into vrt.  Multiple bands can be listed.
    By default all bands are queried.
  o The default tile index field is 'location' unless otherwise specified by
    -tileindex.
  o In case the resolution of all input files is not the same, the -resolution
    flag enable the user to control the way the output resolution is computed.
    Average is the default.
  o Input files may be any valid GDAL dataset or a GDAL raster tile index.
  o For a GDAL raster tile index, all entries will be added to the VRT.
  o If one GDAL dataset is made of several subdatasets and has 0 raster bands,
    its datasets will be added to the VRT rather than the dataset itself.
    Single subdataset could be selected by its number using the -sd option.
  o By default, only datasets of same projection and band characteristics
    may be added to the VRT.