[cf-pointobsconvention] radial

Dear John

 For example, another data type we are interested in is "radial" (eg radar). Weve been reserving 
"grid" to mean "grids in cartesian coordinates".

If the data is a rectangular array (angle,radius) I would call it "gridded".
It has an orthogonal index space even though it's not Cartesian coordinates.

Best wishes

Jonathan