Antonio76
Captain
Flight distance : 144403 ft
Denmark
Offline
|
James Mitchell Posted at 2018-6-13 00:24
Thank you so much for this. Very helpful.
Just a couple of questions. I assume the height in the image file is height above sea level and not the height above ground level? It does not seem correct.
Question 1) the height is above ground, not ASL. It is from the takeoff location. EDIT Sorrry, of course this is wrong. The exif data from the picture report the GPS height, which is from Sea leve (but it is not precise at all...)
Question 2) I would take a different approach. what matters is the field of vue (FOV) of the camera, not the size of the sensor.From the height of the camera and the FOV you can calculate the diagonal of the recorded image in meters, and from there the area. You will also need to know the aspect ratio of the image, from the camera settings. These images will help you...EDIT: Sorry, the pictures should be in reverse order. first one to be looked at after the second one... ALSO: in the second picture it should read "Consider the triangle AVB" , NOT AVC.
|
-
-
|