On mardi 30 mai 2017 17:44:18 CEST MUTLU OZDOGAN wrote: > Dear Developers > > I have two multi-band geotiff files (each about 2 GB in size uncompressed) > that I would like to mosaic using gdal_merge.py. These files make up two > halves of a single Landsat footprint so when joined should create a single > mosaicked image. I checked the corner coordinates and they seem correct. > However, when I use the gdal_merge.py command with the -co “COMPRESS=LZW” > option, the final file size ends up being a ~100 GB which does not make any > sense. Any ideas about what is going on? I checked the image dimensions > and they seem to be correct and should result in a file that is about 4.5 > GB in size uncompressed so the compressed version should be at least this > size if not smaller.
Mutlu, Asy you noticed, gdal_merge.py strategy is not necessarily optimal regarding minimizing file size in case of compression So I'd recommend using a workflow like : gdalbuildvrt tmp.vrt landsat1 landsat2 gdal_translate tmp.vrt merged.tif -co COMPRESS=LZW -co TILED=YES Even -- Spatialys - Geospatial professional services http://www.spatialys.com
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