Consider using RNetCDF rather than ncdf4 for read_ncdf?

[dblodgett-usgs]

Looking here: https://github.com/r-spatial/stars/blob/master/R/ncdf.R#L89 I'm haunted by the special handling of coordinate variables in ncdf4. RNetCDF is much closer to the native NetCDF-C API and I think would be a safer way to go.

I'll work up a quick PR for consideration that uses the ncmeta function to find coordinate variables in this area of the function.

[mdsumner]

I definitely support this! I actually can't remember why I used ncdf4 here for read - it's usually my default for raw reading, but I'm much more familiar with RNetCDF generally (as you can see from ncmeta).

There might be some gotchas still.

[mdsumner]

What is the special handling that scares you?

[dblodgett-usgs]

Cool. PR on the way.

I've stumbled over the way ncdf4 reads coordinate variables into the dim object and then doesn't treat the variables like variables in their own right.