[CF-metadata] question about proper cell bounds for ocean_volume_transport_across_line

From: Jonathan Gregory <j.m.gregory>
Date: Fri, 18 Jan 2019 17:17:34 +0000

Dear Matthias

> While I can provide (scalar) lat/lon that would be something like the
> section mid-point, and proper cell_bounds with these, the result is that
> the user then knows a lat/lon box where my data are from. The user does
> not yet know which ones of the box vertices are my actual section
> endpoints (could be the NW-to-SE corner or SW-to-NE).

I agree with Jim that the new simple geometries convention (coming in the next
version of CF) would be suitable to draw the line in detail.

> 3. We amend the standard_name definition to clarify that when looking in
> the direction in which the line is sequentially defined in the lat/lon
> bounds, positive is considered to be 90 degrees to the left. I assume
> this would not only apply to my particular standard_name, but all of:
> ocean_volume_transport_across_line
> sea_ice_area_transport_across_line
> sea_ice_transport_across_line
> sea_water_transport_across_line
> snow_transport_across_line_due_to_sea_ice_dynamics

Yes, that's a good idea. By "to the left" do you mean anticlockwise, when
viewed from above? That would be consistent with the definition of polygonal
cell bounds.

Best wishes

Jonathan
Received on Fri Jan 18 2019 - 10:17:34 GMT