 Hello, in this video we are going to further explore the new elevation profile tool that's available from QDS 3.26. This time we are going to compare raster DTM's contours and we will finally also add a point cloud. We are going to look at one of the highest areas in the Netherlands and we will download from this website the DTM and later we will download the point cloud. After downloading the TIFF file of the 5 meter DTM we see that there is a lot of voids, no data values that we can interpolate before continuing our comparison. In the processing toolbox we search here for no data and I need that GDAL tool fill no data which will interpolate the voids based on the surrounding pixels. I keep the default settings here and I save the result and here we see that our voids are gone. Now we want to compare this 5 meter DTM with some other DTM products that are available through the open topography DTM downloaded plugin. So I install the plugin and I choose here SRTM 30 meters as one of the products that I want to compare and I use the layer extent. I need an API key so if you have an account on open topography you can there find your API key, copy the API key and paste it in the dialogue. Save the result. After processing repeat this also for the NASA DEM that we are going to compare. After downloading I go to the layer properties of the DEMs and there is a new tab elevation where I can indicate that the layer represents an elevation surface and there I can also define the style for the profile. I can use line or fill below and I can change the color. Here you can also check the projection and you see that this is in the geographic coordinate system which cannot be used in analysis but if we want to use the profile tool this will be okay. Also for SRTM we can check the coordinate system and we can go to the elevation tab to indicate that it represents an elevation surface and we can change the style if needed and we do the same for the detailed DEM. Now for our reference we are going to use the detailed DEM so I will apply some styling. I am going to use one from CPT city, choose topography and I will use this one this time and I can duplicate the layer and I apply a hill shade render and I blend it with the color ramp. To demonstrate that the new elevation profile tool can also deal with contour lines I am going to extract contour lines from the detailed DEM. From the raster menu I choose the contour tool and I am going to change the interval to 5 meters, that is the equidistance and there I also check the box to produce a 3D vector because the 3D values can be used by the profile tool. I made a typo but I will keep it. Also here in the layer properties I find the elevation tab and I can change here some settings and what is important is to change it to absolute elevation clamping which will use the Z values from the features and I can choose for interpretation to just visualize the points on the contours in the transect or to connect those dots. Here I choose to connect these dots and to also visualize the dots. So let's open the elevation profile panel, we are choosing it from the view menu and there you see our elevation layers and here if you double click on the line you can still go to the layer properties and change the settings that I have shown before like changing the colors of the lines or the marker style. Here for the contours I use a black line and black dots. Now let's add a transect, click right to complete the line and here it plots now the result, the different elevation profiles and the dots also for where it hits the contour lines and we see that the trend in the data is the same but that there is an offset between the SRTM derived products and the DEM derived from LIDAR, the 5 meter resolution DEM. I can also choose fill below that will give a fill color that I'm changing it back to the line. I can also show the individual points only then it will use by default the styling of the lines so the same color change to blue dot and and uncheck respect layer symbology. So now we have the blue dots on the line. Zoom in to the area you can also see where on the transect we are if we move our mouse in the graph. Let's draw another one, click right to complete. You can also draw a profile for factor lines that you already have. Here I'm going to create a new factor line as a temporary scratch layer. Let's call it transect. I use a line stream. I change the projection to the one of the project and I'm going to digitize a line, click right to complete toggle of editing and now I can select the line and it will plot the profile for the line. Now we're going to add a point cloud. We've seen in a previous video that we can visualize point clouds also in the new elevation profile tool. So after adding it will convert to the COPC format and then it will load. Let's draw a new transect and there we see ground unclassified so in this data the trees are unclassified. We see some houses and buildings so in the elevation properties we can apply opacity to points that are at a further distance and this gives a nicer effect which we see here and then it's also nice to change the symbology of unclassified to green to represent better the trees. We can play with the tolerance. It remembers the last setting that you've used. It determines the buffer distance around the line for the point of the point cloud to take into account and you can change the order of the layers so you can compare the different elevation sources with each other and when you pan and zoom you can see the details. So in this video you've seen how you can compare roster DEMs, contour lines and point clouds with each other in the new elevation profile tool that's available from QDS 3.26.