Odm: Method to get the suitable resolution of the orthophoto

Created on 1 Sep 2017 · 3Comments · Source: OpenDroneMap/ODM

The current method which set the resolution of the orthophonto to 20 point/m is not very flexible. We can
calculate it from the input image. If an image has the GPS information, then the resolution can be calculated by the below equation.

Resolution = 100 / (H * SizeofPixel / focalLength)

Here, H is the altitude of the flight (m), SizeofPixel is the size of the pixel for the CMOS (micro-meter), focalLength is the focal length (mm). The unit of Resolution is points/m.

@dakotabenjamin

enhancement help wanted

Source

xialang2012

Most helpful comment

Perhaps we can find a solution that works for both. Use @xialang2012 suggestion for the default but give the ability to scale down as needed.

dakotabenjamin on 1 Sep 2017

👍2

All 3 comments

There was me thinking it was pretty flexible. Sometimes i don't want a full resolution image. 50 hectares at 2500 pixels /m2 is just too many.

KommandorKeen on 1 Sep 2017

Perhaps we can find a solution that works for both. Use @xialang2012 suggestion for the default but give the ability to scale down as needed.

dakotabenjamin on 1 Sep 2017

👍2

@xialang2012 we've added better orthophoto units (cm / pixels) and constraints that use GSD estimates to better calculate a suitable resolution for the orthophoto. Please update and let us know if it fits your use case? If not, please re-open the issue :hugs: