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Azimuth description and diagram do not match #18

@DFEvans

Description

@DFEvans

(This is kind of the same point as #14, but that issue requests a change to the definition - I'm simply noting that the diagram doesn't match the written definition)

view:azimuth is defined as:

Viewing azimuth angle. The angle measured from the sub-satellite point (point on the ground below the platform) between the scene center and true north. Measured clockwise from north in degrees (0-360).

which I interpret as "Azimuth is the angle between the lines S-North and S-P", where S = Sub Satellite Point and P = Target (or Scene Centre) Point.

However, the diagram in the readme indicates a different definition such that "Azimuth is the angle between the lines P-North and P-S":
Image

In short, if a satellite is due south of the target and we ignore spherical geometry awkwardness, which of these values is view:azimuth meant to be?

  • 0 degrees, the satellite is looking north (text description)
  • 180 degrees, the satellite is located south of the target (diagram)

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