[Qgis-user] QGIS won't open Martian .img files

[Even Rouault]

Le vendredi 08 juillet 2016 14:32:55, Adam Neather a écrit :
> Hello everyone,
> 
> I'm trying to use QGIS to get topographic profiles from Mars Global
> Surveyor data. (Example link below.) While QGIS will open the .lbl files
> as a raster with no problem, I always get the error "Unsupported Data
> Source: /Users/username/Desktop/megr00n180hb.img is not a supported
> raster data source" when trying to open the .img. (In fact, this is only
> under Windows 10; QGIS on Mac OS X refuses to open the .lbl files, too,
> with the same error message.)
> 
> The .img files included with the sample data for the tutorials loads
> fine, so I'm not sure what it is I'm doing wrong.

Adam,

It is expected that you cannot use directly the .img. The GDAL PDS driver 
needs to be provided with the .lbl file and it will then automatically load the 
.img.

I've tried opening http://pds-geosciences.wustl.edu/mgs/mgs-m-mola-5-megdr-l3-
v1/mgsl_300x/meg004/mega90n000cb.lbl with QGIS 2.14.3 / GDAL 2.1 on Windows 
and it works fine for me. Works fine on Linux too with at least all GDAL 
versions >= 1.11.

Even

> 
> A colleague has suggested it may be because I need a plug-in to be able
> to read NASA's Planetary Data System file format, but I can't find
> anything about that in the official plug-in repository or when searching
> online.
> 
> Weird thing is, I'm returning to a project from a few years ago, and we
> used QGIS back then to work with this data set, so I'm as confused as
> it's possible to get!
> 
> Any help greatly appreciated,
> 
> http://pds-geosciences.wustl.edu/mgs/mgs-m-mola-5-megdr-l3-v1/mgsl_300x/meg
> 004/

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