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I am trying to project a PDS 3 dataset into sinusoidal projection using ENVI. How do I calculate the longitude of central meridian value?

It is required for projecting the dataset. I have four corner reticules selenographic coordinates of the dataset.

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    Lm = (L1 + L2) / 2 – Vince Jan 1 '17 at 21:19
  • Thank you @Vince . These coordinates form a boundary that is not aligned along the longitudes and they don't form a rectangle. Their footprint forms a irregular polygon with shorter width at the bottom. So do i take the left most and right most longitude for the L1 and L2 values? – Aeron Storm Jan 2 '17 at 17:34
  • This is the sort of information that belongs in the question (along with a screenshot). Please edit the question to contain these details. – Vince Jan 2 '17 at 22:16

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