Lots of users struggle to import GeoTiff files, mostly coming from 3rd party Drone image processing software (both DEM and/or Aerial images). In lots of cases, they get the error ‘unable to read file’. Of course GeoTIFF files exist in different formats/versions (tiled or not, Different compression like Packbits, LZW,…). Apparently, there is a variant on this format: the so called 'BigTiff' file. Standard TIFF uses the file format version 42 in the header, but for the need for bigger images (breaking the 4GB boundary) a new format was needed, the so called BigTiff file format. And this uses the file format version 43 in the header. It's this type of (Geo)Tiff that is not supported by Civil 3D. Users have to follow a workaround to convert these files with free (!!!) OpenSource software. Moreover, other Autodesk software (Infraworks) can read the files without any problem. So, Autodesk has the tech! It would be great that this tech would also be implemented in other (related) software like Civil 3D. Several Support Cases starting from few years ago were created to bring this under the attention, but sadly even now - after a few support cases from several years ago - in version 2023, these files still aren't supported. Hopefully in a near future update?
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