 Hello, welcome back on my YouTube channel. Sometimes we want to compare nominal rusters, which are rusters that have classes, discrete rusters, and generate a new raster that shows the unique combinations of a set of input rusters. As far as I know, there is no native tool in QGIS to do this, so I created a tool using the PC Raster Tools plugin, and the tool is available through the Resource Sharing plugin. For this video, I assume that you have already installed the PC Raster Tools plugin, the installation of the PC Raster Tools plugin is covered in other videos. You also need the QGIS Resource Sharing plugin, which connects QGIS to different Resource Sharing repositories. After installation, you can find this button in the toolbar. Go to Settings to configure the PC Raster Tools Resource Sharing repository. You can go to the GitHub repository, the link will be provided in the description of this video, and then you copy the link to the repository. Fill in the name, PC Raster, and paste here the URL to the repository, and then click Add Repository. You can now find it under All Collections, and then we need the QGIS PC Raster User Script collection. Click Install, and the processing scripts are now installed and added to your processing toolbox. Let's apply the tool to two nominal PC Raster layers. I have a layer here with different land use types, and have another layer with different road types. And with the Combine tool, I would like to know which unique combinations of land use and roads exist. Now we can find the Combine tool under Scripts, PC Raster User Scripts, Combine. Here choose the Raster layers that you want to combine and save the output, I call it Combine. This will generate a PC Raster Nominal layer, which has all the unique combinations of the classes. We have to style this using the palleted unique values renderer because it is a nominal Raster layer with discrete values, and we see that there are nine unique combinations of the two input Raster layers. Let's investigate if the result is what we expect. I go to the Identify tool after selecting the layers, and then I click on a pixel. Make sure that you have expand new results by default selected so you can see there the values of the different layers, roads, combine and land use. And then you can check if each class in the Combine layer is a unique combination of roads and land use. Note that if you want to control the combination of input values or ranges with a certain output value, then you can also use from the PC Raster tools plugin under Relations and Tables, Lookup. And with the Lookup tool, you can use a set of Raster layers as an input and the Lookup table which looks up different values from the different layers and assigns an output value is covered in another video which I'll include in the outro.