Measuring tree height and tree health

Hi I want to measure tree height of woodland. This works fine if the woodland is on a level terrain but if the woodland is planted on a steep slope I get false tree height readings due to the slope of the ground. Is there anyway of making the ground appear flat (tricking the software) so I get the correct tree height data.

Also what are the best filters for measure the health of a woodland in the RGB range (I have a phantom 4)

Could you add a stratification feature in the web app

Hi @Joseph_Scott, please take a look at the following documentations that may help with this. You would have to use Ground Control Points to make it relative to a point on the ground.