@snowman2 I don't think we can make that assumption, at least not in your 
example and as you've expressed it. There is no direct connection in your 
example between the lats and lons and the Xs and Ys. The connection of X with 
projection_x_coordinate and Y with projection_y_coordinate is pretty 
straightforward based on common sense, and on the statement in CF that, "X-Y-up 
should define a right-handed coordinate system, i.e. rotation from the positive 
X direction to the positive Y direction is anticlockwise if viewed from above." 
Following the same logic, longitude should be labeled as an X axis and latitude 
as a Y axis. 

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