[GIS] Why input layers do not have the same grid extent in the processing, hydrological analysis

hydrologyqgisqgis-processing

I'm trying to generate the hydrological analysis using processing and I have already done some terrain processing using the DEM.

In this moment, I'm working in he channel network but, when I assign in the elevation (the DEM) and in the Initiation Grid (the catchment area) the program gives me error.

Here are the screen shots of what has been generated:

this is the configuration in the channel network

this is the error

Best Answer

I've struggled with the same problem for a while. Even when they were in the same CRS the elevation and catchment grids were out by a couple of meters. I think it has something to do with the raster resolution and pixel size. I was able to get around this error by setting the pixel size to a round number (eg 5) when interpolation of the Elevation layer when interpolating to create the DEM.

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