Mrsid and/or ecw support in qgis or gdal

Help
1

I am trying to open some raster images from here but they are only available in sid (mrsid) or ecw formats and qgis cannot open them despite on-line resources suggesting they can be loaded out of the box. qdalinfo --formats does not list either of these formats, though, nor is a plugin I saw mentioned available for installation. Is there an easy way to do this? Do I need to somehow build gdal with support for these formats?

Thanks in advance

2

Looks like neither are supported out of the box in nixpkgs (nixpkgs/pkgs/development/libraries/gdal/default.nix at 9aa6aef6677e352bed16add36e524364c67986da · NixOS/nixpkgs · GitHub) — but ecw seems reasonably easy to add: https://trac.osgeo.org/gdal/wiki/ECW#BuildingGDALwithECWsupportonUnix

I did not check ecw’s dependencies though.

3

Thanks for confirming. That’s what I thought. I was hoping not to have to recompile, but oh well. (Tried the flatpak version too, no luck.)

Cheers

4

ECW can’t be provided by gdal due to licensing constraints. You need to accept Hexagon EULA, download it and build it by yourself as mentioned by @motiejus .

At geospatial-nix, we are working on EULA compliant packaging and integration with the rest of geospatial software stack (see packaging PR: pkgs: add ecw-sdk package by imincik · Pull Request #507 · imincik/geospatial-nix · GitHub ).

BTW, there’s also geospatial Matrix room .

5

Thanks for the info.

6

PR containing GDAL with ECW support can be tested now:

$ nix build --impure --expr "(builtins.getFlake "github:imincik/geospatial-nix/ecw-sdk").packages.x86_64-linux.gdal.override { useECW = true; }"

$ ./result/bin/gdalinfo --formats | grep -i ecw
  ECW -raster- (rw+): ERDAS Compressed Wavelets (SDK 5.5) (*.ecw)
  JP2ECW -raster,vector- (rw+v): ERDAS JPEG2000 (SDK 5.5) (*.jp2)

First attempt to build will fail with error message containing instructions how to download ecw-sdk and add it to nix store. Feedback very much appreciated.

7

I haven’t been able to build qgis since the recent kernel bump. I’m getting “configure: error: *** Unable to locate suitable (>=1.7.1) PDAL library.”. I’ll try this when I’m able to build it again (using flathub version of qgis for now).

8

This error is fixed now in Nixpkgs master.

9

I have created example project containing QGIS built with GDAL with ECW support. See REAMDE for instructions how to use it.

10

Indeed it is, thank you. :grinning:

11

Cool. I look forward to checking it out this weekend.I really appreciate your help, thank you.