My name is Antriksh.
I’m running a small drone survey business and getting in to the survey industry.
We are working for water management department on canal project. They are building a Dam in the area which will distribute water for irrigation purpose in surrounding villages through canals. The area of interest is 3400Ha or 34 Km square. For covering the area we used Phantom 4 drones and did ~102 flights all over the area. This area has elevation difference arond 50 meter. So i did flights from different areas of different elevation.
My client need 0.5 meter contour map of the area.
I divided the compete area in to sub areas of 100Ha each. So total 34 sub parts. Each flight has following details-
75m height AGL
70% frontlap and 60% sidelap
4000X3000 pixel images
I got around 1400 (7GB) images in a patch of 100Ha covered with single drone using ~3 batteries.
Now when i process these images i need to do it one by one sub part (100Ha area)
Here is the tricky part-
If keep contour base 0 in each map than because i flew from varying elevation the contour line will not match while merging all contour maps.
My client want the Dam base as 0 and need 0.5 meter elevation contour line respective to that. How it can be done?
I observed DTM doesn’t remove human build structure like houses, which create noise in the contour map. How can i get rid of that? Mostly of the survey area is crop field having small villages.