A new GRASS virtual raster format has been added to trunk in r72761-4, together with a new module to build a GRASS VRT: r.buildvrt.
*r.buildvrt* builds a virtual raster (VRT) that is a mosaic of the list of input raster maps. The purpose of such a VRT is to provide fast access to small subsets of the VRT, also with multiple simultaneous read requests. *r.buildvrt* creates a list of raster maps that can be located in different mapsets. The ouput is a read-only link to the original raster maps which is only valid if the original raster maps remain in the originally indicated mapset. A VRT can also be built from raster maps registered with *r.external*. Reading the whole VRT is slower than reading the equivalent single raster map. Only reading small parts of the VRT provides a performance benefit. Please test! Markus M
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