Fix: correct longitude distance calculation for snapping radius#79
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The previous logic produced a wrong `deltax` whenever both model and observation longitudes exceeded 180 deg. Replaced with shortest-arc formula from LSTDA: compute the absolute difference and wrap it by subtracting from 360 if it exceeds 180.
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The previous logic in
obs_SM_pdafomiproduced a wrongdeltaxwhenever both model and observation longitudes exceeded 180 deg.Replaced with shortest-arc formula from
obs_LST_pdafomi: compute the absolute difference and wrap it by subtracting from 360 if it exceeds 180.Found by: @visakhraja