Transcript PBO - Jackson

PBO GPS Network
PBO GPS Network
GPS Station Layout
MET Station
Cascadia Real Time
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Why are real-time geodetic data products important?
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For science-based hazard monitoring, real-time geodetic
data are critical for determining static and dynamic
displacements, slow slip and early post-seismic
transients, and critical measurements between the
seismic frequency band and static displacements.
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Decisions and response can only be made as fast as the
data are provide.
UNAVCO will provide realtime data delivery
Essential data products such as position estimates,
tropospheric water content, ionospheric electron column
density are not included in this proposal.
UNAVCO Real-time Geodetic data
• What real-time GPS data are
available from PBO?
• What are the critical
constraints on delivering realtime GPS data?
• Who are the primary
customers of these data sets?
• What are the future plans with
respect to real-time data for
the PBO?
UNAVCO PBO RT Data
• What are the availability of real-time geodetic products?
• Currently UNAVCO in a beta-test phase streaming GPS data
from ~84 PBO stations with an average receiver to PBO server
latency of 1.11 s and an average of 93.2% data completeness.
Data completeness is low because we are testing the “good, the
bad, and the ugly” data communications scenarios.
• For UNAVCO RT beta-test we are using a broad range data
communications types including direct internet, VSAT, CDMA
modem, and IP radio.
• Note these are raw data only. Providing epoch-epoch solutions
is a critical component of a science and hazards system.
Real-time Geodetic Data
Definitions
• What are real-time geodetic data and how do you assess
the quality?
• The definition of real-time data depends on the on the science
target, sampling, rate, and latency of data from instrument to user.
• For earthquake and volcano science and hazards applications we
use a a 1 Hz sampling interval and latency requirement of < 5
seconds for data between station to processing center.
• Also need to define a “completeness” metric. For earthquake and
volcano hazards applications we use a 95% data completeness
requirement.
• Other considerations include station up-time and the ability to
respond to maintenance issues.
Latency and Completeness
Average latency 1.11 s
Average completeness 93.2%
Cascadia Real-time
• NSF proposed real-time
upgrade of 232 stations
in Cascadia.
• Funded as part of the
American Recovery and
Reinvestment Act
(ARRA)
• Three year
implementation plan
• Initial upgrades focused
on ETS critical stations
• Priority based on
science target, time line,
location of personnel
Before
Cascadia Real-time
• Station upgrades
include power
augmentation and
upgraded data
communications
• 3-G CDMA modems
• removing VSATS
• high speed radio
networks
• Purchase data
distribution and QC
software including
latency, completeness,
position estimation
After
Year 1
• Start work Fall
2009
• Upgrade Mount
St. Helens
stations
• Upgrade 86
stations in forearc
• Work driven by
science targets
and location of
personnel
Year 1
Year 2
Year 1
Year 2
• Upgrade 37 forearc stations in
Oregon
• Upgrade high
altitude sites
including Mt.
Shasta/Lassen
Year 3
Year 1
Year 2
Year 3
• Upgrade
remainder of
back-arc stations
Project Milestones
Budget
Personnel
Personnel
FTE
Time (yrs.)
Field Tech
0.25
3
Field Engineer I
2
3
RT Network Admin
0.5
5
Database
0.25
5
Archive
0.25
5
Education and Outreach
0.5
5
Data Distribution