NSA/GNDRAD/C1 - Net radiometer removed

The net radiometer was removed from the NSA.C1 GNDRAD instrument suite on Feb 3, 2000.  
Net rad variables were filled with garbage data until Sept 23, 2000 and with missing values 
(-9999) until 20041103.  The net rad variables were removed from the netcdf files after 
20041103.

A reprocessing task (RID-526) has been submitted to the queue to address the need to add 
metadata to the NSA.C1 GNDRAD netcdf files documenting the missing data as well as to move 
toward a consistent datastream format throughout time.

• base time in epoch(base_time)

• Net Radiation, Standard Deviation(net_std)
• Net Radiation(net)
• Net Radiation, Maxima(net_max)
• NET mean(net_mean)
• NET standard deviation(net_sd)
• NET minimum(net_min)