erget commented on this pull request.


> @@ -79,17 +79,30 @@ __Map parameters:__::
 * **`sweep_angle_axis`**
 * **`fixed_angle_axis`**
 
-__Map coordinates:__:: The x (abscissa) and y (ordinate) rectangular 
coordinates are identified by the **`standard_name`** attribute values 
**`projection_x_coordinate`** and **`projection_y_coordinate`** respectively. 
In the case of this projection, the projection coordinates in this projection 
are directly related to the scanning angle of the satellite instrument, and 
their units are radians.
+__Map coordinates:__:: The x (abscissa) and y (ordinate) rectangular 
coordinates are identified by the **`standard_name`** attribute values 
**`projection_x_angular_coordinate`** or **`projection_x_coordinate`** 
(deprecated) and **`projection_y_angular_coordinate`** or 
**`projection_x_coordinate`** (deprecated), respectively.
+In the case of this projection, the projection coordinates in this projection 
are directly related to the scanning angle of the satellite instrument.

I feel torn here because the units are actually up to the user, whereas they 
must be compatible with the canonical units. Those are connected to the 
`standard_name` used and in order to reduce redundancy I wouldn't call it up 
here.

I think they were mentioned before because the paragraph was essentially 
overwriting the standard names table's values in this special case.

Optimally, from 1.9 I'd like to completely remove the use of the old units 
rather than simply deprecating it but that's probably a bridge too far.

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