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I have a large set of GeoTIFFs, about 12 000 files (total 18GB), that together forms one large map. What would be the best approach to create a tile pyramid out of this dataset?

I'm thinking that to join the GeoTIFFss to one large file and then create a image pyramid would be one way, although I think that it might be that the size of the combined file could be to large to handle?

Is there any other way that might be better/quicker?

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To start with 18Gb is not that big (and I expect it could be smaller with compression) but the easy way to do this is to make a virtual dataset using gdalbuildvrt and then tile that file using gdal2tiles.py

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