# Title
Add direction attribute for coordinate axis
# Moderator
(Any takers?)
# Moderator Status Review [last updated: YY/MM/DD]
???
# Requirement Summary
Add a direction for the coordinate system axis attributes to specify which
direction the coordinate goes in. This is useful when building a coordinate
system.
# Technical Proposal Summary
Example:
```
double y(y);
y:standard_name = "projection_y_coordinate";
y:direction = "north"
y:unit = "metre"
double x(x);
x:standard_name = "projection_x_coordinate";
x:direction = "east"
x:unit = "metre"
float Temperature(y, x);
Temperature:units = "K";
....
Temperature:grid_mapping = "Lambert_Conformal: x y";
```
# Benefits
Would support more coordinate systems & be more explicit.
For example NORTH_POLE_EASTING_SOUTH_NORTHING_SOUTH or
SOUTH_POLE_EASTING_NORTH_NORTHING_NORTH:
See axis maps here:
https://pyproj4.github.io/pyproj/latest/_modules/pyproj/crs/coordinate_system.html
WKT form of coordinate sytem:
```
CS[Cartesian,2],
AXIS["(E)",east,
ORDER[1],
LENGTHUNIT["metre",1]],
AXIS["(N)",north,
ORDER[2],
LENGTHUNIT["metre",1]],
```
# Status Quo
Currently only supported in the vertical coordinate:
http://cfconventions.org/cf-conventions/cf-conventions.html#vertical-coordinate
```
axis_name:units = "meters" ;
axis_name:positive = "down" ;
```
# Detailed Proposal
Refer to above ^^
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