ToNCDFSG: Convert sp objects to NetCDF
In dblodgett-usgs/NCDFSG: NetCDF-CF Simple Geometries

Creates a file with point, line or polygon instance data ready for the extended NetCDF-CF timeSeries featuretype format. Will also add attributes if a sp dataframe object is passed in.

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ToNCDFSG(nc_file, geomData = NULL, instance_names = NULL,
  instance_dim_name = NULL, lats = NULL, lons = NULL,
  variables = list())

`nc_file`	A string file path to the nc file to be created.
`geomData`	An object of class `SpatialPoints`, `SpatialLines` or `SpatialPolygons` with WGS84 lon in the x coordinate and lat in the y coordinate. Note that three dimensional geometries is not supported.
`instance_names`	A character vector of names for geometries. If NULL, integers are used. If the geomData has a data frame, this is not used.
`instance_dim_name`	If the file provided already has an instance dimension, it needs to be provided as a character string otherwise a new instance dim may be created.
`lats`	Vector of WGS84 latitudes
`lons`	Vector of WGS84 longitudes
`variables`	If a an existing netcdf files is provided, this list of strings is used to add the geometry container attribute to the named existing variables.