Global Site Update History:
2016-03-09: Updated IceBridge to Version 2 (2009-2013), Added IceBridge Quicklook (2012-2015)
2016-04-15: Added CryoSat AWI data
2016-05-16: Added AIR-EM data for 2015
2017-03-22: Updated IceBridge Quicklook Data to include 2016 data
2017-03-22: Updated CryoSat-AWI data through 2017-02
2018-11-21: Updated USSUB-DG to include 2011 and 2014 SCICEX missions
2018-11-21: Updated CryoSat-AWI to AWI version 2.1
2018-11-21: Update IceBridge QL through 2018
2018-11-21: Added USSUB-HI (Historical) to include submarine draft from digitized from LeShack 1980
2018-11-30: Included NetCDF formatted summary files
2018-11-30: Changed CryoSat to Version 20181130 to put Snow Depth as Variable 3
2018-12-01: Updated BGEP data through 2017
2019-09-20: Updated IceBridge QL 2019 data, fixed date problem with IceBridge QL 2017/18