I have a project which is to generate topographic maps of the ice surface on a glacier. We have taken picture with a camera on a drone and generate the model with pix4d. But the model is wrong on different coordinates, During our expedition, we have taken some DGPS points with their coordinates. I have add all of them (just like 3 or 4) to the model and it is a little corrected but not all the model is right.
My question is; if I want a real and reliable model, do I have to take more DGPS points and add them to my map? It can work? Or I have done mistake in my process ?
Thanks a lot !