Who can use this feature
Editors of a project within a Professional or Pro + workspace.
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 a dataset
Select a line
Click the terrain profile tool from the top menu bar (or use the keyboard shortcut 'Shift + T')
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 meters off. Learn how to add GCPs to your workflow 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.
Step by step
1. Click the drop down next to the polygon drawing tool, and select the line tool (or use the L shortcut)
2. Click on the map to start drawing your line
3. Double-click to finish it
4. With the line layer selected, hold control (CMD on Mac) and click on a dataset
5. Click the terrain profile tool icon. Note that this will only appear if you have both a line and a dataset selected.
6. Review the data!
