Process and equipment needed to add GPS/IMU data to images to analyze them.
DJI Phantom 4 - WGS84 (ellipsoid) height
Dear All,I'm using a DJI Phantom 4 quadricopter and UgCS V. 2.9 update 1 on a Win 7 (x64) laptop to make orthoimages. I've noticed that, in pics' EXIF, elevation is recorded according to geoidic height. I would like to write in each pic the elevation measured directly from the on-board GPS, i.e. WGS 84 ellipsoid height, without further transformation.The control software is not able to change this setting (only AMSL or AGL options), I'm wondering about firmware update/change...Is there anything…
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I would recommend looking at the bookstore of asprs.org. They have several books that would be good resources to understand basic photogrammetry. As for the software, photoscan is a good program to start with. It’s not as robust as most UAV suites but it just works. The leap from a suite like this to one we use for professional photogrammetry like Intergraph ISAT or Trimble Match-AT is going to be about $30,000 and they can be a lot more complicated and ultimately have more tools than you will ever need for a UAV. Hope this helps.
That will give you the x,y,z values of the camera's physical location at the time the image was captured.
This is referred to as the "Photo Center"
Traditionally in photogrammetry this is how we solved AT. First you need to solve for your interior orientation and tie your imagery together. Then using ground control you can create a block adjustment. This same process pretty much holds true with modern UAV image processing suites. I know that one approach you can take is to use photoscan to solve for your camera and tie your images together. It does not need starting GPS points to tie images together. Once you have this you can add ground control. This can either be true ground control that was collected or you could use known points from google earth. Obviously the second choice will not be very accurate at all however if you are just looking for rough orientation, this should work. Once you apply those ground control points, photoscan should create an exterior orientation that can then be used in other software. I hope this helps.
Christian,
Just PM me, and I send a link, about 270MB, 300 shoots, is worth?
Hi,
I'm looking for some image datasets that I can use to test various auto correlation techniques. If anyone has any they are willing to share, I would be truly grateful. Specifically, if anyone has data sets of any type of right of way, that would be extremely helpful. Finally a dataset with nadir, forward and aft obliques would be awesome. Any help is greatly appreciated.
Thanks