Forum

Author Topic: Phantom 4 Multispectral  (Read 9459 times)

billwinston

  • Newbie
  • *
  • Posts: 4
    • View Profile
Re: Phantom 4 Multispectral
« Reply #15 on: January 11, 2023, 01:41:39 AM »
We have been using a P4M and a reflectance calibration panel from MAPIR (https://www.mapir.camera/products/mapir-camera-reflectance-calibration-ground-target-package-v2?_pos=1&_sid=7c30952e8&_ss=r )  along with this workflow (https://jenacopterlabs.de/?p=1430) to collect and process data from mid-Missouri.  Seems to work well.

bravemaster3

  • Newbie
  • *
  • Posts: 9
    • View Profile
Re: Phantom 4 Multispectral
« Reply #16 on: January 11, 2023, 01:47:29 AM »
We have been using a P4M and a reflectance calibration panel from MAPIR (https://www.mapir.camera/products/mapir-camera-reflectance-calibration-ground-target-package-v2?_pos=1&_sid=7c30952e8&_ss=r )  along with this workflow (https://jenacopterlabs.de/?p=1430) to collect and process data from mid-Missouri.  Seems to work well.
This workflow looks like the other ones I have followed. Did you also have a mix of sun and shadows and get a perfectly balanced orthophoto without bright spots and dark parts?


billwinston

  • Newbie
  • *
  • Posts: 4
    • View Profile
Re: Phantom 4 Multispectral
« Reply #17 on: January 17, 2023, 08:26:37 PM »
Our collection occurred on an overcast day with no direct sunlight.  The resultant NDVI image did not show any obvious hotspots.

bravemaster3

  • Newbie
  • *
  • Posts: 9
    • View Profile
Re: Phantom 4 Multispectral
« Reply #18 on: February 01, 2023, 11:06:27 AM »
Our collection occurred on an overcast day with no direct sunlight.  The resultant NDVI image did not show any obvious hotspots.

Did the orthophoto look good too? Some artefacts in orthophotos don't show much in NDVI since it is a normalized index. So, if it is an artefact occuring similarly in all bands (or particularly in Red and NIR bands that are relevant for NDVI), then NDVI might look good.

Anyway, I got better results (not perfect) with Average blending mode instead of Mosaic.

Thanks,