Align rasters tool: Missing OUTPUT parameter in GUI of the processing tool

[Jannik-Schilling]

What is the bug or the crash?

The processing tool "Align Rasters" cannot be executed. The error message says: "Unable to create output file" but in the GUI of the tool the output file cannot be defined.

Steps to reproduce the issue

• Open the processing tool "align rasters" (processing toolbox or Raster > Align Rasters)
• select a raster input layer and a raster reference layer (+ [optional] any further input parameter)
• Click in 'Run'

Execution will fail due to missing output file definition:

Versions

QGIS version	3.36.1-Maidenhead	QGIS code revision	3e589453
Qt version	5.15.3
Python version	3.9.18
Compiled against GDAL/OGR	3.8.4	Running against GDAL/OGR	3.8.3
PROJ version	9.3.1
EPSG Registry database version	v10.098 (2023-11-24)
GEOS version	3.12.1-CAPI-1.18.1
SQLite version	3.41.1
PDAL version	2.6.0
PostgreSQL client version	16.2
SpatiaLite version	5.1.0
QWT version	6.1.6
QScintilla2 version	2.13.4
OS version	Windows 10 Version 2009
Active Python plugins
generate_swmm_inp	0.34
OSMDownloader	1.0.3
plugin_reloader	0.9.3
processing_saga_nextgen	1.0.0
quick_map_services	0.19.34
WaterNetAnalyzer-master	1.8
db_manager	0.1.20
grassprovider	2.12.99
MetaSearch	0.3.6
processing	2.12.99

QGIS version 3.36.1-Maidenhead QGIS code revision [3e589453](https://github.com/qgis/QGIS/commit/3e589453) Qt version 5.15.3 Python version 3.9.18 Compiled against GDAL/OGR 3.8.4 Running against GDAL/OGR 3.8.3 PROJ version 9.3.1 EPSG Registry database version v10.098 (2023-11-24) GEOS version 3.12.1-CAPI-1.18.1 SQLite version 3.41.1 PDAL version 2.6.0 PostgreSQL client version 16.2 SpatiaLite version 5.1.0 QWT version 6.1.6 QScintilla2 version 2.13.4 OS version Windows 10 Version 2009

Active Python plugins generate_swmm_inp 0.34 OSMDownloader 1.0.3 plugin_reloader 0.9.3 processing_saga_nextgen 1.0.0 quick_map_services 0.19.34 WaterNetAnalyzer-master 1.8 db_manager 0.1.20 grassprovider 2.12.99 MetaSearch 0.3.6 processing 2.12.99

Supported QGIS version

• [X] I'm running a supported QGIS version according to the roadmap.

New profile

• [X] I tried with a new QGIS profile

Additional context

No response

[agiudiceandrea]

@Jannik-Schilling, you need to select each input layer, click on "Configure Raster" and set the output raster layer path/name and the other parameters.

[agiudiceandrea]

@DelazJ @alexbruy, maybe the algorithm documentation in the user manual and the algorithm short help need to be improved in order to explain how to properly set the output raster parameter in the GUI.

[Jannik-Schilling]

ahhh Thanks. Indeed I just used the checkboxes and didn´t click on "Configure Raster" because it didn´t seem necessary

Here´s a quick proposal for the helpstring: https://github.com/qgis/QGIS/commit/4dcda33eb93b38599bdc6c18386178101f6cc43f

[Jannik-Schilling]

Maybe missing user input for output files should also be ckecked here: https://github.com/qgis/QGIS/blob/c67e81ba03b82a482b51aa5064136d70c292840c/src/analysis/processing/qgsalgorithmalignsingleraster.cpp#L121

Maybe something like ...

if ( !outputFile )
    throw QgsProcessingException( invalidRasterError( parameters, QStringLiteral( "OUTPUT" ) ) );

... for each input layer

[agiudiceandrea]

@Jannik-Schilling it would be nice if you submitted a Pull Request with your proposed fixes.

[github-actions[bot]]

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