 Hello, in this video we're going to convert the ruster channel network to a vector line format. We will use the rtint tool from grass in the first step in order to be sure that the lines are only one pixel wide. We can keep the defaults and we save the file to a geotiff so make sure you change from .map to .tiff and I call it channel-stin. Let's run it. We can ignore the warning, warnings are not errors. Click close and here we see the result. We can adjust the legend by using the pelleted unique values and click classify again. There you see that it has taken over the values 8, 9 and 10 of the original layer corresponding with the strahler orders. But if we compare both layers then we can also see what the difference is so it has reduced it to only one pixel width which we need for the next tool to convert it to vector. Therefore we use the rtint tool from grass. So the input is the channel-stin geotiff. We change the feature type to line and we check the box to use the ruster values as categories instead of a unique sequence and that way it will use those strahler orders from the ruster. So there we define that the output is a line and we can save the result as a shapefile. Let's call it channels. Also here we can ignore the warnings and it will produce the result. Here we see that it has a line through the center of the pixels. Let's have a look at the attribute table. There we see a field called cat which has the pixel values for the strahler orders. Now in reality we don't have strahler orders that start with 8 and then go to 9 and then to 10 so we can recode them to the real strahler orders of the rivers. So I create a new field called order which are whole numbers. The output field length is 1 because we only have values 1, 2 and 3 in the end. And I use the case when function. Go to fields and values so when cat equals order 8 then it should be order 1. When it's 9 make it 2 and when it's 10 make it 3 and the case function ends with an end statement. The preview doesn't give errors so that looks good. Click OK to apply it and here we see the result. We can sort the order so we see 1 is the first order. Talk of the editing and save the result and go to the layer styling panel to change the styling of this vector layer. Go to the simple line and change that to interpolated line. Let's zoom a bit out to get an overview and we use for the stroke width a varying width. The start value is order and the end value is also order. We already see some results here but it is scaling it now between 0 and 10 while we only have 1 until 3. So if I click the refresh button it is now scaled between 1 and 3 but that looks a bit too drastic. So we need to also change the minimum and maximum width. I'm going to use here points and I change it from 1 to 3 points and that looks more like how it should be. And the only thing that remains is to change the color to something blue for water and let's use this combination. Let's put the color hill shade in the background and our rivers are on top. So in this video you've learned how to convert a raster river network to a nicely styled vector line network.