Skip to main content
. Author manuscript; available in PMC: 2024 Nov 12.
Published in final edited form as: Remote Sens (Basel). 2019;11(15):10.3390/rs11151742. doi: 10.3390/rs11151742

Table 1.

Summary of the three measurement methods as regards equipment, method variants, and special issues.

Upward-Pointing Irradiance Sensor Radiance Sensor and Reflective Plaque Direct Sunphotometry
Equipment Irradiance sensor (cosine response)
Inclinometer		 Radiance sensor
Reflective plaque
Inclinometer		 Sunphotometer (radiance) sensor
Pointing mechanism
Atmosphere radiative transfer model
Variants Surfacing of underwater drifting floats.
Shadowband for diffuse/direct.		 White/grey plaques Hand-held or robotic pointing
Other notes Uncalibrated radiometers?
(see Section 3.1.1)
Plaque viewing nadir angle? (see Section 3.1.2)