June 2020
Page 17 of 21
Downwelling Light Sensor 2 (DLS 2)
The Downwelling Light Sensor (DLS 2) is an advanced incident light sensor that connects
directly to Altum. During a mission, the DLS 2 measures the ambient light and sun angle and
records this information in the metadata of the TIFF images captured by the camera. This
information can then be used by specialized processing tools (like Pix4Dmapper) to correct for
global lighting changes in the middle of a flight, such as those that can happen due to clouds
covering the sun.
In addition, the DLS 2 provides GPS data to Altum unless GPS data is provided from an
external source as outlined earlier in this guide. If using an alternative GPS source, the GPS
receiver will remain on at low power.
© 2020 MicaSense, Inc
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