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I have two layers. The first one is a vector layer with a lot of polygons. The other one is a raster layer. I need to extract raster to many rasters by individual polygons of the vector layer.

I tried the option Raster > Extraction > Clip Raster by mask layer but just one raster was extracted and not of each polygon.

This is my code and the error:

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  • Strange, should work.. What if you rename the raster layer in the layer list/tree to something else and adjust line two. Like raster1. And/or restart qgis and try again. Your raster isnt a WMS layer or some other remote service right?
    – Bera
    Commented Dec 30, 2021 at 12:04
  • i changed name by raster1.tif but they show me the same error, my raster is a an imager GeoTIFF
    – resuk
    Commented Dec 30, 2021 at 12:08
  • which model exactely? using each polygone isn"t possible i have i lot of should i use one layer composed by many polygons to split raster
    – resuk
    Commented Dec 30, 2021 at 12:16
  • Are they all singlepart polygons with good geometry? It looks like you have a lot of polygons of potentially "interesting" shapes which might favor using selections to do the clips and then merging them together.
    – John
    Commented Dec 30, 2021 at 14:10
  • but the error of code has realtion with vector or raster?
    – resuk
    Commented Dec 30, 2021 at 14:59

3 Answers 3

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You can build a model with Vector Features input. It will then iterate over each polygon and clip the raster. Make sure to tick "Iterate over this layer..." when you execute the model:

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  • This model seems that will be give the same results like extract by mask plugin, i mean will consider vectoe with many polygone like just one to split imagery
    – resuk
    Commented Dec 30, 2021 at 12:36
  • @resuk your comment is not clear
    – ar-siddiqui
    Commented Jan 3, 2022 at 14:14
  • It will give one raster per polygon. If not you are using Vector Layer as input, and not Vector Features. Or havent ticked the iterate... box
    – Bera
    Commented Jan 3, 2022 at 14:17
  • yes it works good with the plugin split raster by mask also, i am interessted to code juste to give to each raster of the severals rasters the name of id polygone using to split it, i wich u understand me
    – resuk
    Commented Jan 3, 2022 at 14:31
  • Ok I understand. I dont think that is possible using a model, you need pyqgis. Another option is to rename all temp outputs after the model using pyqgis.
    – Bera
    Commented Jan 3, 2022 at 14:40
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Perhaps your polygon layer has geometry errors. Run the Fix Geometry tool, which is found in the Processing Toolbox.

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  • i fixed geometry but the same error
    – resuk
    Commented Dec 30, 2021 at 15:16
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The process described in this question might help you too. The key point is after Raster -> Extraction -> Clip raster by mask layer, you need to click on the little circulation sign:

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Bigger picture:

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Output: separate raster layers.

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