April 8th, 2021

• The complete data acquision on a dev server had been changed from DODS downloads to HTTPS downloads.
  
  (Speed) comparasion:
  

  	DODS-downloads	HTTPS-downloads
  GFS-Parameters (atmoshere data)	19	33 of more than 600 available
  Resolution in data points (lat*lon)	361*720	721*1440
  Timesteps	81 (3h, 10 days)	288 (1h, 5 days, 3h day 6-10)
  Datapoints	400 016 880	9 867 432 960
  Dataformat	netcdf	grib2
  Time to download	720 sec	170 sec
  speed factor per data point	1	104 times faster
  GFSwave-Parameters (ocean wave data)	9	19
  Resolution (lat*lon)	336*720	721*1440
  Timesteps	61 (3h, 7,5 days)	288 (1h, 5 days, 3h day 6-10)
  Datapoints	132 814 080	5 681 249 280
  Dataformat	netcdf	grib2
  Time to download	360 sec	130 sec
  speed factor per data point	1	118 times faster
  RTOFS-Parameters (Ocean data exept wave data)	5	10
  Resolution (lat*lon)	2160*4320	3298*4500
  Timesteps	65 (3h, 8 days)	112 (1h, 3 days, 3h, day 4-8)
  Datapoints	3 032 640 000	16 621 920 000
  Dataformat	netcdf	netcdf
  Time to download	6240 sec	990 sec
  speed factor per data point	1	34 times faster

• new: parallel downloads (about 5-6 times faster with 10 parallel downloads)
• new: partial https downloads are reducing the server load on NOAA side (about 5 times faster than requests through DODS server)
• new: unsage o grib2 format instead of netcdf (about 4 times faster due to transmission of compressed data)
• new. complete rewritten validation of correctness of the received data

 March 1st, 2021

• Due to slow and unreliable downloads via the DODS-server, the decision for a change of the complete data acquision to https-downloads had been made.
  Also the support for the https downloads seems to be much better then for the DODS server.