survey

Hi folks, I'm due to have another go at a photogrammetry survey with my H520. This one is of a *** in Wales which obviously slopes quite steeply. I'm looking for some general guidance/pointers, mainly around altitude. When planning it in Data Pilot, the altitude is said to be 'relative'. I...

I have searched the forums with no luck so I thought that I would pose the question to the forum. I also fly a 3DR Solo occasionally for land surveying and creating high resolution orthomosaic images. There is an app called Tower that allows the user to draw a box around an area and it...