calmet_upper_air: Create an upper air data file for CALMET
In rich-iannone/PuffR: A set of tools to help with CALPUFF dispersion modelling.

This function retrieves upper air sounding data and processes it to generate an upper air input file for CALMET.

calmet_upper_air(location_name, year, lat_dec_deg = NULL,
  lon_dec_deg = NULL, lat_lon_grid_loc = 1, domain_width_m = NULL,
  domain_height_m = NULL, cell_resolution_m = 250, time_offset,
  READ62_exec_location)

`location_name`	an assigned name for the CALMET domain.
`year`	the year for the UP.DAT file.
`lat_dec_deg`	the latitude of the CALMET domain in decimal degrees. The location of this point is defined in the lat_long_grid_loc argument.
`lon_dec_deg`	the longitude of the CALMET domain in decimal degrees. The location of this point is defined in the lat_long_grid_loc argument.
`lat_lon_grid_loc`	the location of the lat/long inputs in relation to the domain. Choices are: 1 (center), 2 (lower left), 3 (lower right), 4 (upper left), 5 (upper right).
`domain_width_m`	the width of the meteorological domain in meters.
`domain_height_m`	the height of the meteorological domain in meters.
`cell_resolution_m`	the grid cell resolution in meters.
`time_offset`	the offset from UTC-00:00 in hours.
`READ62_exec`	if the READ62 executable is in the system path, provide the name of the executable only; otherwise, provide the full path and name of the READ62 executable.

## Not run: 
# Generate an upper air station file
calmet_upper_air(location_name = 'test',
                 year = 2005,
                 lat_dec_deg = 49.196116,
                 lon_dec_deg = -122.505866,
                 lat_lon_grid_loc = 1,
                 domain_width_m = 117000,
                 domain_height_m = 43250,
                 cell_resolution_m = 500,
                 time_offset = -8,
                 READ62_exec = "read62")

## End(Not run)