[nkguinn]

What is the convention for measuring the Incidence Angle that appears in AcqIncAngle in the dataset description? For example, is this angle measured from the north? Is positive clockwise?

[avelasco]

“The incidence angle is defined as the angle between the vertical direction and the radar wave propagation vector at the surface (as shown in Fig. 1-3). When surface curvature effects are neglected, the look angle is equal to the incidence angle at the surface when the surface is flat.” Nothing to do with the North.
https://descanso.jpl.nasa.gov/SciTechBook/series2/02Chap1_110106_amf.pdf

• This reply was modified 1 year, 6 months ago by avelasco.

[nkguinn]

I have a similar question for heading angle, for AcqHeading in the dataset description. Why are the angles negative?

[periz]

please search the forum before posting questions
https://www.sarproz.com/groups/sarproz-group/forum/topic/orbit-heading/

[nkguinn]

I read that post but didn’t really understand it. If my AcqHeading in SARPROZ is -11, then according to the previous post, on a 360 degree circle, that would correspond to 169?

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