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I estimated the Potential Incoming Solar Radiation in SAGA. The tool creates a file "direct insolation" and "diffuse insolation". When I export these files as .tif, a layerstack of 3 raster layers is produced for each insolation file.

In the documentation of the tool I can not find an advice, what the layers in particular mean. Does anyone knows how to interpret those layers?

Here is a screenshot of the layers from direct insolation enter image description here

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beginners fail. I exported the file via "save as image", so off course it creates an RGB-image. In order to provide the original .tif file produced by saga you have to call the tool export GeoTIFF (IMPORT/EXPORT --> RGDAL/OGR) and a single layer .tif will be exported as expected.

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