Radiometric calibration of Micasense camera images

Interpolating irradiance values of the Micasense panel during the drone flight time and adding them into images' metadata.

Below, we go through the options to download and install a full working Python environment for the job. For sake of convenience, the use of Anaconda or miniconda environments is recommended.

Installing ExifTool, software for editing image metadata

wget https://cpan.metacpan.org/authors/id/E/EX/EXIFTOOL/Image-ExifTool-12.15.tar.gz
tar -xvzf Image-ExifTool-12.15.tar.gz
cd Image-ExifTool-12.15/
perl Makefile.PL
make test
sudo make install

For more information visit exiftool install

Cloning the imageprocessing repository at micasense GitHub page

git clone https://github.com/micasense/imageprocessing.git
cd imageprocessing
conda env create -f micasense_conda_env.yml

cd imageprocessing
conda activate micasense
python setup.py install

Cloning the panelcorrection repository

cd ../
git clone https://github.com/wwolff7/panelcorrection.git
cd panelcorrection

For editing and replacing image metadata values the file ExifTool_config must replace the original .Exiftool_config file. For example on Ubuntu:

cp ExifTool_config ~/.ExifTool_config

For more details please see my question on ExifTool forum. Phil Harvey, ExifTool author help me a lot!

Finally, open the Panel_correction.py file and edit it with some python IDE (e.g., emacs, vim, spyder, jupyter, atom, etc.). Just set up the path of your images and let the panel capture before the flight as the first file and the panel capture after the flight as the last file.

Remarks

• Tested on Ubuntu 18.04 LTS for Altum camera.

To-do

• Test on Ubuntu for RedEdge-MX camera.
• Test on Windows for Altum and RedEdge-MX cameras.