fetch(api, site, start, end) Requests data for a CRN site containing the requested start, end interval.
get_filename(site, year) Get the applicable file name for CRN a site on a given date.
initialize_site_observations(api, site) Create an observation for each available variable at the SOLRAD site.
update_observation_data(api, sites, …) Post new observation data to all reference observations at each USCRN site betweem start amd emd.