Reading DLS Irradiance Metadata

When a DLS unit is connected to the camera, irradiance measurements at the time of capture are stored in the XMP section of the image metadata. This information is open and readable using standard EXIF metadata reader tools and libraries. If you would like to apply your own processing techniques, you can look at the image metadata using a library such as exiftool. 

  • The Irradiance Field is a measurement of the spectral irradiance (W/m^2/nm) in each band.
  • The Irradiance Yaw, Irradiance Pitch, and Irradiance Roll fields provide the measured orientation of the DLS in degrees

Here is an example of irradiance metadata:

$ exiftool IMG_0106_2.tif
Irradiance : 131.378754
Irradiance Roll : 1.8932661497089052
Irradiance Pitch : -7.0249684496199967
Irradiance Yaw : 57.545878211823961


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