pinpointmapping
lvl.4
Flight distance : 5345105 ft
United States
Offline
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It depends a little on the desired end product. You can start with placing some aerial photo/GCP targets in the area of interest if the final geolocation matters, or skip this step if it doesn't. Fly a grid pattern (can be monitored via map view on tablet) slowly across the area of interest with the camera pointed Nadir (straight down). The altitude dictates final ground sample distance (GSD/pixel size) Select 5 second time lapse as image type via the shutter button in Pilot app. You are looking to get ~75% overlap between images.m if you are just looking for a nice orthometric image you can stop there. If you want a great looking dense pt cloud, also fly loops around (or grid pattern depending on project size/complexity) with the camera at a 45 degree angle or so.. This provides oblique views of building/object sides. You can also mix in photos from the ground taken by other camera (gopro, dslr, or even inspire camera etc) you are looking to minimize any occlusions ( area in images not seen). I think a good rule of thumb may be to get 5 or more "looks" at anything you want well represented input cloud. The images from inspire have geolocation already in exif header, so just take SD card out and copy to computer and load into pix4d project. Label photos by different groups if taken by different cameras to make file management easier. Use a computer with the fastest CPU & GPU available. I'm using an iMac with dual core i7, 32 GB ram & 2gb vid Ram and data stored and project processing on 120GB SSD. I believe my CPU is my weak link when watching system stats during processing. Pix4D has a great support site with lots of info & videos and tutorials. I'd suggest taking time to look through it. I started off two years ago with a Sensefly eBee fixed wing UAV which uses pix4d "powered software" ( just like pix4d, but only processes images from ebee) and have recently stared playing with full pix4d pro. I just tried an interior mapping project where I captured 300 images via handheld Gopro 3 and was stoked on the quality of the output. The images weren't even geotagged, just a string of photos taken every step or two, and the software was still able to build an impressive pt cloud. Just experiment and you'll find that it is really pretty easy (easier if you have a solid background in GIS & remote sensing). I've been advised that the geniuses @ Pix4d are hard at work on including the inspire 1 & phantom 3 in their capture App and hope to have my hands on a beta copy shortly. I showed my bosses at the local water utility what pix4d and an inspire can do and have gotten approval to get one for work (now I am learning how to get a 333 exemption)
Feel free to drop me an email if you have specific ?s pinpointmapping@gmail.com |
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