I have a .vrt file that references (i.e. was created based on) five .tif files (whose sizes are 1.3 MB, 2.7 MB, 330 MB, 4 MB and 2.7 MB). These files represent a Digital Elevation Model (DEM), where the third file is the most general file and the other 4 are refinements of the channel of the river draining the area.
I want to get a .tif file from the .vrt file, but when i do this i get a 4.5 GB file, which for me is excessively large compared to the original .tif files.
- I double checked the pixel size and all files (including the .vrt and the output .tif) have the same resolution.
- All of them have the same data type (Float 32).
- All .tif files have the same coordinate system (EPSG 29193), but the .vrt file has a User defined projected CRS. The .vrt file was created using Ras Mapper from (HEC-RAS).
Does anyone know why exporting the .vrt file increases the file size so much?
What could i do to reduce/compress the output .tif file?
I exported the .vrt to .tif using QGIS 3.6 and would prefer to stick to this software to find a solution.
Am now trying to export the output .tif from the original .tifs, however, i still want to understand what may be the issue transforming .vrt to .tif.