Cloud-optimized GDAL VRT


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We were discussing whether it would be possible to use `gdalbuildvrt` on several cloud-optimized GeoTIFF and obtain something that behaves like one big COG (which would be awesome to serve up large collections of GeoTIFFS, e.g. via Terracotta). `rasterio` seems to be able to read GDAL VRTs just fine, but it does not seem to have access to the overviews of the datasets. Is there anything obvious we could try? Is this missing functionality in GDAL or Rasterio?

See also https://github.com/DHI-GRAS/terracotta/issues/10

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