I have 52 weekly raster layers in QGIS. How can I get a mean annual raster layer from these 52?
The Raster calculator will do this but as its operators are all basic maths ones it will be a little longwinded. Is there a better/simpler way?
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2 Answers
Starting from QGIS 3.16 you can perform cell-based statistics natively using Cell Statistics tool. For your case, you can use Mean cells as a statistic method to calculate the mean of all 52 rasters.
There is a GRASS GIS tool r.series in the Processing Toolbox.
QGIS 2.18.18 Interface:
- Start
r.series - Select all layers (or select required layers)
- Check
'Propagate NULLs'if you have NoData in your rasters - Select
average
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thanks @Kazuhito that was easy to follow, BUT it fails: "line 395, in processAlgorithm if isinstance(out, QgsProcessingOutputHtml): NameError: name QgsProcessingOutputHtml' is not defined". I am using QGIS 3.01– GoomerCommented Apr 18, 2018 at 20:48
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line 395, in processAlgorithm if isinstance(out, QgsProcessingOutputHtml): NameError: name QgsProcessingOutputHtml' is not defined– GoomerCommented Apr 18, 2018 at 20:51
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1Thanks @Goomer I cannot reproduce that error myself, but it may be related to this post Error running r.thin in QGIS. Does the process give you the output?– KazuhitoCommented Apr 18, 2018 at 21:00
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looks like something is broken in the installation. I get the same error with all of the raster GRASS tools I have tried so far. I reinstalled QGIS but still get the same error.– GoomerCommented Apr 18, 2018 at 21:51
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