While surveying with https://click4r.com/posts/g/10125976/ , images of the bottom are taken from multiple vantage points. Through processing these images, a photogrammetry software can then create orthomosaics and 3D models, that it could measure accurate distance, along with surfaces and volumes of physical objects.
Data outputs from the drone
Images taken by the drone are usually saved on a memory (such as SD card), just like for just about any other camera. With respect to the technology used by the drone, the images already are geo-tagged or can be imported in a geo-tagging software, such as for example WingtraHub. Based on the size of the survey site, you almost certainly have between a couple of hundred images and a few thousand, and each image contains geographical information (X, Y, Z).
Importing into a photogrammetry software
After importing or uploading the geo-tagged images in a photogrammetry software such as for example Propeller, Bentley ContextCapture or Pix4D, images will undoubtedly be stitched together to create 2D or 3D models of the surveyed site. Image processing can be quite a lengthy process with regards to the number of images and the performance of your computer. Some photogrammetry software are desktop-based, thus requiring robust hardware. Check over here is cloud-based, employing powerful servers rather than your local computer to process the info.