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I have 4139 ecw files of aerial photography that I would like to be able to open fairly easily and quickly in a QGIS project. I thought a virtual raster would be the way but when I have tried it comes up with the error:

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I did this through Raster > Miscellaneous > Build Virtual Raster (Catalog)...

Could it be the length of the file path? Don't think it's too long.

Can you join several virtual rasters together?

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Most of the time it is due to the length of the command line generated in the dialog box.

Look how the command is structured and/or rather type something like the following :

gdalbuildvrt my_vrt.vrt *.ecw

It will "pick" all the *.ecw files located in your source folder.

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  • Ah ok. I'm not very good with writing commands. Do I need to substitute some of the wording above? I just tried copying and pasting that command but it came up with this error: ERROR 4: `*.ecw' does not exist in the file system, and is not recognized as a supported dataset name. Warning 1: Can't open *.ecw. Skipping it
    – Hannah Wheldon
    Feb 6, 2018 at 12:51
  • u have to ensure your are using the right locations : before my_vrt you must add the location of the file u want to create (u must have write permission ...) and before "*.ecw" u must add your source folder. it could be something like : gdalbuildvrt d:\myfolder\my_vrt.vrt s:\mysourcefolder\ *.ecw
    – Snaileater
    Feb 6, 2018 at 12:53
  • And yes u have to subsitute the whole content by this command and it should be fine.
    – Snaileater
    Feb 6, 2018 at 12:59
  • I've copied and pasted these locations and it comes up with errors saying the locations don't exist?
    – Hannah Wheldon
    Feb 6, 2018 at 13:30
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    Why do you have question marks in the naming of your folders ? You should also avoid spaces. If there's any space the whole path must be put in brackets.If it still doesn't work make a test with a simplified file tree ...
    – Snaileater
    Feb 12, 2018 at 10:29

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