calpuff_add_line_sources: Add line sources to a list for later use in CALPUFF
In rich-iannone/PuffR: A set of tools to help with CALPUFF dispersion modelling.

Add line sources to a list for later use in CALPUFF

calpuff_add_line_sources(src_name, species_name, lat_dec_deg = NULL,
  lon_dec_deg = NULL, x_coord_km = NULL, y_coord_km = NULL,
  UTM_zone = NULL, UTM_hemisphere = NULL, release_hgt, base_elev,
  emission_rate, emission_units)

`src_name`	the name of the source emitting the species.
`species_name`	the name of the species undergoing emissions.
`lat_dec_deg`	a vector of 2 latitude values for the line source in units of decimal degrees.
`lon_dec_deg`	a vector of 2 longitude values for the line source in units of decimal degrees.
`x_coord_km`	a vector of 2 UTM easting values for the line source in km units.
`y_coord_km`	a vector of 2 UTM northing values for the area source in km units.
`UTM_zone`	the UTM zone for the line source.
`UTM_hemisphere`	the UTM hemisphere for the line source.
`release_hgt`	the release height of the line source in meters above ground level (m AGL).
`base_elev`	the ground elevation at the location of the area source in meters above sea level (m ASL).
`emission_rate`	the rate of constant emissions from the line source; units are defined in the 'emission_units' argument.
`emission_units`	the units applied to the value defined in the 'emission_rate' argument. The possible selections are: (1) "g/s", (2) "kg/hr", (3) "lb/hr", (4) "tons/yr", (5) "Odour Unit * m3/s", (6) "Odour Unit * m3/min", (7) "metric tons/yr", (8) "Bq/s", and (9) "GBq/yr".