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Calculating ground GPS coordinates of photo taken from UAV
Started this discussion. Last reply by JP Feb 17. 9 Replies 0 Likes
When you take a picture from a UAV how do you go about figuring out the GPS coordinates of the area in the photo - I don't want/need the GPS of the UAV but want the coordinates in the photo itself?…Continue
Tags: coordinates, gps, ground
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JP replied to Lee Wenger's discussion Calculating ground GPS coordinates of photo taken from UAV"I don't know if this will help or not but here is a PHP script which will query the USGS elevation service for LAT/LON and report back. Their service is very unreliable and usually experiencing downtime. Hope it helps, Thanks
JP
function…"
Mike M replied to Lee Wenger's discussion Calculating ground GPS coordinates of photo taken from UAV"AMSL (sometimes just ASL) is Above Mean Sea Level which simply accounts for sea level differing depending on which sea and atmospheric conditions. Don't ask me where the official datum is - I'm sure there are probably 20 of them."
Lee Wenger replied to Lee Wenger's discussion Calculating ground GPS coordinates of photo taken from UAV"I'm finding some cool resources
here is a general page for finding big "repositories" of gis information:
http://serc.carleton.edu/research_education/geopad/topographic_data.html
Web Services available from…"
Lee Wenger replied to Lee Wenger's discussion Calculating ground GPS coordinates of photo taken from UAV"Thanks for response Mike - yeah its been obvious I guess that folks are making a few unlikely assumptions that include that the elevation of the target photo is at the same elevation as the take off point - in mountainous areas of Colorado, which is…"
Mike M replied to Lee Wenger's discussion Calculating ground GPS coordinates of photo taken from UAV"I think your problem is going to be AGL vs AMSL. Using trig to calculate picture position from altitude determined via barometric pressure will only give you the right coordinates at sea level. Not only would you need to know AGL altitude, you would…"
James Magos replied to Lee Wenger's discussion Calculating ground GPS coordinates of photo taken from UAV"Hey Lee,
Latest MP does something like this, in camera button, but its easy to calculate it yourself:
As you said you have to Know the camera focus angle and sensor ratio, the relevant hight (using baro), GPS Position, and roll pitch heading,…"
Lee Wenger replied to Lee Wenger's discussion Calculating ground GPS coordinates of photo taken from UAV"Hey Adam,
The issue is not about getting the GPS coordinates of the UAV at the time of the snap shot - thats easy - what I'm after is calculating the actual photo boundary when it may be at a distance from the UAV. just for sake of…"
Adam Haggerty replied to Lee Wenger's discussion Calculating ground GPS coordinates of photo taken from UAV"If you're using a standalone camera, perhaps matching photo timestamps with your telemetry log? This isn't a fun answer but it might be the quickest route.
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Lee Wenger posted a discussionCalculating ground GPS coordinates of photo taken from UAV
When you take a picture from a UAV how do you go about figuring out the GPS coordinates of the area in the photo - I don't want/need the GPS of the UAV but want the coordinates in the photo itself? I'm not quite sure where to find more information about this - any pointers?See More
Lee Wenger replied to Johann Van Niekerk's discussion Adding a Hall sensor to brushless motors ?"A hall effect sensor placed in the way shown should give you pulse resolution equal to the number of magnets in the shell and will give pulses like a quadrature encoder (if you use a latching hall sensor). Using a pair of sensors placed…"
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