 Hello, in this video we are going to intersect the green level 3 land cover classes with the subcatchment boundaries, because later we need that for our area calculations. Go to the vector menu, geo-processing tools and choose intersection. As an input layer we choose the Korean 2018, as an overlay layer the catch polygons and we save the result to our geo package. Let's call it Korean catch intersected. Run the tool and you'll see that there's an error, there's an invalid geometry. This is caused by the factorization of the original raster subcatchments. We can easily fix those geometry errors. Go to the processing toolbox and look for fixed geometries. Simply use the layer that causes the problem as an input and save the result in our case in the geo package. Call it catch poly fixed and run this tool. It will create a fixed copy of the original. And now let's do the intersection with the corrected layer. So as an input layer we use the Korean 2018 dissolved layer. For overlayer the fixed catch poly layer and we save the result to the geo package. Also here I use a new name. Go to Korean catch intersected, core. Click run and there's the result. We can simply copy the style from the original Korean layer to this intersected one because the classes don't change, just the boundaries. So in this video you've learned how to intersect the Korean land use classes with the subcatchment boundary line, resulting in a layer of subcatchments with the Korean classes in it.