When I draw a polyline in Pix4D, it is generated in the same dimension (horizontal axis). However, I want the polyline to follow the surface of the terraing to obtain a terrain profile.
if you upload the project to Pix4D cloud, you will be able to obtain what you are looking for. In the article Elevation profile and cross-section on the cloud how to create an elevation profile is explained. If you have already processed your project locally, you can upload your results to the cloud. Please ensure that the georeferenced DSM is uploaded, if the project has not been processed on the cloud.
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