projection_x_angular_coordinate
https://w3id.org/hacid/data/cs/variables/cf/projection_x_angular_coordinate <https://w3id.org/hacid/onto/data/Variable>
"x" indicates a vector component along the grid x-axis, when this is not true longitude, positive with increasing x. Angular projection coordinates are angular distances in the x- and y-directions on a plane onto which the surface of the Earth has been projected according to a map projection. The relationship between the angular projection coordinates and latitude and longitude is described by the grid_mapping.
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projection_x_angular_coordinate