It keeps being over- or under-exposed under variable conditions. How to prevent it?

One of the biggest issues I have with DD come mostly from that DD does not support HDR shoot. I am surveying area with soils of chalk and forest mixed together. Soils of chalk are very reflective and forests are much darker than that giving high contrast.

In a case that I use auto-exposure by DD, soils of chalk are sometimes over-exposed when a significant portion of the field of view is taken up by the forest. So I chose to set the exposure in the DJI Go App. But it also gives over- or under-exposed images because the solar illumination would change rapidly because of the presence of clouds crossing in front of the sun.

I realized that I will have to discard a substantial number of images because they were over-exposed and sometimes are too dark.

What would you advise me to do to deal with this issue?

Thanks!

What drone are you playing? This is a condition that is not easy to deal with. Same thing on construction sites. I can fly and when I get split over trees vs say concrete, it over exposes the concrete in one direction and under exposes the trees in the other direction.

What overlaps are you running? Running higher overlaps helps because you will get more pictures on the individual subject and allow the camera to adjust because in a sense it is like decreasing speed. In these conditions it doesn’t matter if it is dronedeploy or DJI Go, the fact is that the cameras on the majority of these drones is not fast enough when auto exposing.

Thanks for the reply MichaelL.
I am flying DJI Phantom 4 with 80%/80% overlaps. Yes, having higher overlaps might be an option. But I will need to think if I will be able to achieve a reliable and consistent measure of spatial errors over the entire survey area by doing so.

Using HDR shooting and saving it in DNG format will increase the time needed to take pictures over the area. Is it why DD doesn’t have HDR and DNG support?

If you are already running 80 then I don’t think there would be much help. I typically run 75/75 at 230-240. I post-process my all my images in ACDsee with a batch filter that normalizes, basically lightening shadows and fixing blowout. If you decide to get into something like that and I can share my filter.

https://forum.dronedeploy.com/t/acdsee-batch-editing/12368

It might take a DD account to see this. Map was completely dark out and now represents what it actually looks like.

https://www.dronedeploy.com/app2/data/5a7b35caf57eac8095facd85;jwt_token=eyJhbGciOiJIUzUxMiIsInR5cCI6IkpXVCJ9.eyJ0eXBlIjoiUmVhZE9ubHlQbGFuIiwiaWQiOiI1YTdiMzVjYWY1N2VhYzgwOTVmYWNkODUiLCJleHAiOjI1MzQwMjMwMDc5OX0.EABAwwYgH8SfSo9RMTiYruiYaU82Zowoq-gGr3NE2g-lKD-lJIA8hl6cHrKIWr5VXgy16jsynAmp41vVyGE1Hw

Here’s another thread.

https://forum.dronedeploy.com/t/batch-post-processing/8444