GSC Sentinel-2 PDGS OCD - Emits - ESA

GSC Sentinel-2 PDGS OCD
Issue 1 Revision 2 (draft) - 25.07.2010
GMES-GSEG-EOPG-TN-09-0008
page 336 of 350
PDGS
NRT Data
NRT
MARINE
Nominal Data
SECURITY
Nominal
Repository
Repository
Nominal Data
Nominal Data
EMERGENCY
LAND
GMES SERVICES
SERVICES NOMINAL [GB] NRT [GB] TOTAL [GB]
LAND 1550 0 1550
EMERGENCY 1600 1000 2600
SECURITY 61 12 73
MARINE 25 50 75
TOTAL 3236 1062 4298
Figure A-3 Yearly Data Volume Estimates derived from DAP-R
A.5 Open Data Policy and the of Landsat Experience
On April 2, 2009, the U.S. Geological Survey (USGS) LANDSAT Project delivered its
500,000th free image for Fiscal Year (FY) 2009. A recent USGS policy change enabled
LANDSAT data to be distributed at no charge via the internet. Prior to the policy change, the
highest year of distribution was in FY2001 when approximately 25,000 scenes (185x185 km)
were delivered. This phenomenal increase in distribution comprises an estimated 95 TB of
data downloaded by users (from October to April).
Although the USGS does not have detailed records since the mission's inception in 1972,
there is good evidence that more data have been distributed in the first 6 months of 2009 than
in the entire first 36 years of the LANDSAT missions combined. This trend seems to increase
exponentially.
On August 17, the one-millionth LANDSAT image scene has been downloaded reaching a
total of almost 200 TB of data in less than one year. Figure A-4 shows the incidence of scene
downloaded all around the world while Figure A-5 the distribution of the on-demand
processing orders.
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