The INCIDENCE ANGLE is the angle between the target-Sun vector and the local vertical vector at the boresight intercept.
The PHASE ANGLE is measured between the boresight intercept-to-Sun vector and the negative of the boresight vector.
The EMISSION ANGLE is measured between the negative of the boresight vector and the local vertical vector at the boresight intercept.
CNES
18, avenue Edouard BELIN
31401 TOULOUSE cedex 4 FRANCE
Fax : 33 (0) 5 61 27 30 84