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I’m trying to open a large DTM file in QGIS but I’m encountering errors. The data is a DTM 5x5 m map of the Lombardia region. The .ige file is 7.7 GB and the .img file is only 522 KB.

I’ve tried opening the file in both the stable long-term release (version 3.28.13 “Firenze”) and the latest version (3.34.1 “Prizren”) of QGIS. Since im a complete beginner i tried opening both the ige and the img files, just in case. Trying to open the img in both versions i get a ‘bad allocation’ error. Trying to open the ige in both versions I received a parsing error. The exact error message I received is: ‘Unable to open project: Project file read error: error occurred while parsing element at line 1 column 1’.

I’ve already tried re-downloading the file from the official site of Geoportale Lombardia and checking the file path. Despite these efforts, the issue persists.

I’m using a Windows system with a 13th Gen Intel® Core™ i7-13650KF CPU @1.65GHz, 14 cores, 28 logical processors, and 31.7 GB of memory. During the execution of QGIS, only Microsoft Edge, Notepad, and File Explorer are open, and I have 352GB of free disk space.

How can I successfully open this large DTM file in QGIS without encountering these errors?

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  • The img file contains the headers and other data, the ige has the raster info for it, so keep them together. Add the img to a project. Can you download smaller sections of the overall area and add them successfully to a project? Is your project using the same CRS as the DTM file? Can you contact the data provider to discuss the issue?
    – John
    Commented Jan 21 at 23:13
  • Ive finally been able to solve this, this was an embarassing error from my part due to my absolutely newbie knowledge. I just had to first create a project and only then try to add it. Still, thanks for your response
    – Zea Mays
    Commented Feb 6 at 11:11

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