Who can use this feature
Editors of a project within a Professional or Pro + workspace.
Selection requirements for tool to work
One or more drone mapping datasets
One or more lines overlapping the dataset
The terrain profile tool on GeoNadir allows you to visualize and analyze elevation changes across a landscape. It creates a cross-sectional view of your terrain and also shows the differences between your DSM and DTM. You can use this difference to estimate vegetation and building heights.
Select one or more overlapping drone mapping datasets
Select a line, line layer, or multiple lines (also must overlap your dataset/s)
Click the terrain profile tool from the top menu bar (or use the keyboard shortcut 'Shift + T')
Optionally enlarge the graph to see more detail and create an animation to export.
Optionally export your results to CSV to further analyze in Excel or similar.
Note that the elevation values as shown on the y-axis of the terrain profile will not be correct unless you have uploaded GCPs with your data. While the horizontal positional accuracy of drone data is usually within a couple of meters of reality, the vertical positioning can be several to tens of meters off. Learn how to add GCPs to your workflow here. You can also vertically adjust your DSM/DTM to ensure the values are comparable - learn more here.
Note that the accuracy of this tool is dependent on the quality of your input data and the derived DSMs and DTMs. Results will be less accurate where the ground cannot be distinguished in the digital elevation models, such as in areas of dense canopy cover or very large buildings. For best results, use GCPs as part of your processing workflow, and always 'sense check' the outcome.