Formula for determining resolution (cm/pix)?

Sigit Riyanto July 27, 2017 at 4:01am

i have tested if we use photogrammetry standard formula GSD = flight height (m) / Focal lenght (mm) x pixel size maybe we cannot find GSD as report software like agisoft photoscan report software. but if we use this formula GSD = (sensor height (mm) x flight height (m) x 100) / (focal lenght (mm) x image height (pixel)) we can get result as like software report. for example i use DJI phantom 3 pro camera that focal lenght = 3.61, sensor height 4.62, image height = 3000 pixel and flight heigt 173 m, from mission planner i can get result GSD 7.38 cm, from calculation using the formula GSD = (4.62 x 173 x 100)/(3.61 x 3000) = 7.38006

IMHO, maybe useful

Cody November 21, 2016 at 7:19pm

Hello,

I am a student at UW-Green Bay and have worked with one of my physics professor to come up with an equation for the situation which you are asking. The equation is below in the image and is based on the way you calculate resolution for telescopes. You will need to use this equation twice to calculate the distance covered in both the x and y direction.

I hope this helps!

dharmana harish naidu October 26, 2016 at 9:05am

brother where can i find focal plane?

Pierre Stoermer said:

Hi Matt:

Try this: GSD (ground sample distance or resolution/pixel) = Pixel size X AGL / Focal length where:

Pixel size = focal plane width or height (in mm) / focal plane # of pixels in either width or height,

AGL = elevation above ground in meters,

Focal length in mm.

Additionally the frame size on the ground is GSD x focal plane # of pixels in either width or height.

Pierre

XDrones September 7, 2015 at 5:49am

This app has a UAV Photo Coverage Calculator:

http://playboard.me/android/apps/com.xdrones.dronestoolsupdate1?lan...

XDrones June 28, 2015 at 5:13am

AERIAL CAMERA GROUND FOOTPRINT CALCULATOR

http://www.xdrones.es/aerial-camera-ground-footprint-calculator/

Jason Best April 9, 2014 at 5:09pm

I realize this is a fairly old thread, but just today I was working on this problem and after I solved it (I think), I found this discussion. Others have already provided a number of good answers and resources but I thought I'd add my own. The attached Excel spreadsheet is not as comprehensive as the one provided by Drones Imaging but has a few different calculations you might find useful. Please let me know if you see any errors or have suggestions.

AerialSurveyPlanner.xlsx

Drones Imaging September 22, 2013 at 10:53pm

Hi Matt,

you can download an excel grid on DronesImaging.com

http://www.dronesimaging.com/wp-content/uploads/2013/05/documentati...

Good luck

novadrone > Drones Imaging January 13, 2021 at 3:04am

If the above link doesn't work for you, try the one inside this url:

https://www.dronesimaging.com/solutions/documentation/

Cheers

Documentation