Why RTN?
Real time GPS Networks (RTN) and their Implications with
Geographic Information Systems (GIS)
Like the intrepid, tenacious surveyor of old, we’ve come a long, long way!
Kevin M. Kelly, M.A.Sc., OLS Geodesist Redlands, CA [email protected]
Agenda RTN Concept RTN Implementation RTN and GIS Technology Fusion The Road Ahead Kevin M. Kelly, M.A.Sc., OLS Geodesist Redlands, CA [email protected]
Ubiquitous RTN A new GNSS infrastructure
South Africa China Malaysia
Denmark
Ohio Germany
Ireland
Japan
Switzerland
Singapore
Continuous accurate position in real time with minimum user equipment
Why RTN? Those pesky GNSS errors!
•Distance-dependent errors lower accuracy and reduce RTK range •RTN models these errors regionally and broadcasts corrections •Greatly extends the range of accurate RTK positioning •Regional GNSS infrastructure •Reduces survey costs
Real Time Network Centimeter accuracy in real time
@ COMM GSM GPRS CDMA WiWi-Fi EDGE NTRIP
@ @
Rover
GPS Base Stations
N RT
rk o tw Ne
@
Various implementations of RTN
@
RTN Processing Server
• Network adjustment • Network corrections • Manages RTN • Communications
RTN Implementations Virtual Reference Station (VRS)
rRover computes standard RTK “short” baseline solution qData sent to rover
nRover sends approximate position to RTN Server oServer computes corrections for rover position pServer computes “virtual” observations for a nearby virtual base station Technology transparency
RTN Implementations Master-Auxiliary Concept (MAC) Rover sends approximate position to RTN Server Server selects RTN station nearest to rover as “Master” station Server applies network corrections to Master and rover data Server computes correction differences between Master and Auxiliary stations Data sent to rover Rover computes single or multiple base RTK baselines
Technology transparency
RTN and the Surveyor Î RTN supported
Construction Design As-built
Analysis GIS
Survey
New Facilities Planning
Operations GIS
Enabling Technology • • • • • •
Faster Processing Increased Bandwidth Larger Storage Web Services Standards Desktop Mobile Technologies Real Time Networks
• GIS Software
Servers
Web Services Laptop
Scalable Networked Hardware
PDA
GIS Servers
Phone
. . . Improving Our Ability To Share and Distribute
GIS Server Technology fusion aids data integration Desktop Explorer Web Map Mobile Viewer
Open APIs
Enterprise Service Bus
3 Tiers Use
Metadata Services
Globe Services
Map Services
Analysis & Modeling Services
Image Services
Open OGC Services
Serve
Author
RTN fits here, right? Î
Georeferenced data is Driving integration
Wrong!, Well, not entirely…
Server GIS Managing a Network of Sensors Many ways to author data • • • • • • •
Aircraft Traffic Business Weather Census Construction Demographic Geophysical • Gravity • Geodesy • Oceanographic • Atmospheric • Seismic • Tsunami • Infrastructure • Lightning
• Monitors
• Real-time Network • • • • •
RFID Satellite Surveying Streams Etc.
Services
ArcGIS Server
Survey / RTN provides consistent framework
Server GIS Managing a Network of Sensors What does this real-time stream sensor network have in common with an RTN?
RTN is ALSO a sensor network!
RTN as a Global Network of Sensors Practical and scientific role of RTN Geodatabase
GIS Server
GGOS / GEOSS
Visualize
Model ArcGeodesy Geodetic Data Model
T1
Analyze
• • • • •
• •
Ionosphere Troposphere Geodynamics Reference Frame Sea-level
RTN as a geodetic Sensor Network
Position/RTK Network corrections
Earth Science Contribution of RTN Earth observation refers to the collection, processing, modeling, and dissemination of data about the Earth system. These data are collected through in situ, airborne and space-based observations, using satellites, buoys, seismometers, and other devices. They then can be processed into forecasts, maps, and other decision support tools, providing valuable and often life-saving information to end users. -Group on Earth Observations GEO Secretariat Switzerland http://www.earthobservations.org/about/about_GEO.html http://www.earthobservations.org/about/about_GEO.html
Geodetic Contribution of RTN IAG's Global Geodetic Observing System GGOS is the Global Geodetic Observing System of the International Association of Geodesy (IAG). It provides observations of the three fundamental geodetic observables and their variations, that is, the Earth's shape, the Earth's gravity field and the Earth's rotational motion. motion. GGOS integrates different geodetic techniques, different models, different approaches in order to ensure a longlongterm, precise monitoring of the geodetic observables in agreement with the Integrated Global Observing Strategy (IGOS). GGOS provides the observational basis to maintain a stable, accurate and global reference frame and in this function is crucial for all Earth observation and many practical applications. GGOS contributes to the emerging Global Earth Observing System of Systems (GEOSS) not only with the accurate reference frame required for many components of GEOSS but also with observations related to the global hydrological cycle, the dynamics of atmosphere and oceans, and natural hazards and disasters. disasters. GGOS acts as the interface between the geodetic services and external users such as GEOSS, IGOSIGOS-P, and United Nations authorities. A major goal is to ensure the interoperability of the services and GEOSS. With this the geodetic community can provide the global geosciences community with a powerful tool consisting mainly of high quality services, services, standards and references, and of theoretical and observational innovations. © GGOS (Pages still under Development, welcome to comments, text and picture content, which should be sent to weisse@[email protected] or post comments into the Open Forum), Last update: 14:53 26/10 2005
Real Time Network
GPS Base Stations
ArcGIS Server manages survey data
@ Author
Internet
@
Rover
@
@ @
Desktop
Use
Serve
Web Map Viewer
ArcGIS Server
Mobile
Open APIs
Enterprise Service Bus
National Geodetic Survey Control Initiative National Spatial Reference System, NSRS Geodetic Control as a Web Service • Single source for control • Tier control • Standardized Data Models • Data Sharing Agreements • Access can be open or limited • Encourages use of survey control • Consistent data to all users • . . . And a Spirit Of Collaboration
NSRS Database
ArcGIS Server
The Road Ahead ESRI seeks your participation . . . ArcGeodesy – a comprehensive geodetic data model
Geodetic Tools & Applications Leveling Gravity
Interoperability GPS on BM •Ellipsoidal geometry •Geoid modeling •Network adjustments •Geodetic parameters
•Terrestrial geodesy •Satellite geodesy •Gravity
ESRI CORS / RTN GPS Tracking Station •PBO Class construction •Submit to NGS and PBO •Stream all data types •Data will be free •ESRI managed •Real-time data stream into GDB
@ “ESRI”
Geoid Model
Real time GPS Networks (RTN) and their Implications with
Geographic Information Systems (GIS)
Thanks!
Kevin M. Kelly, M.A.Sc., OLS Geodesist Redlands, CA [email protected]
Geographic Information Systems (GIS)
Like the intrepid, tenacious surveyor of old, we’ve come a long, long way!
Kevin M. Kelly, M.A.Sc., OLS Geodesist Redlands, CA [email protected]
Agenda RTN Concept RTN Implementation RTN and GIS Technology Fusion The Road Ahead Kevin M. Kelly, M.A.Sc., OLS Geodesist Redlands, CA [email protected]
Ubiquitous RTN A new GNSS infrastructure
South Africa China Malaysia
Denmark
Ohio Germany
Ireland
Japan
Switzerland
Singapore
Continuous accurate position in real time with minimum user equipment
Why RTN? Those pesky GNSS errors!
•Distance-dependent errors lower accuracy and reduce RTK range •RTN models these errors regionally and broadcasts corrections •Greatly extends the range of accurate RTK positioning •Regional GNSS infrastructure •Reduces survey costs
Real Time Network Centimeter accuracy in real time
@ COMM GSM GPRS CDMA WiWi-Fi EDGE NTRIP
@ @
Rover
GPS Base Stations
N RT
rk o tw Ne
@
Various implementations of RTN
@
RTN Processing Server
• Network adjustment • Network corrections • Manages RTN • Communications
RTN Implementations Virtual Reference Station (VRS)
rRover computes standard RTK “short” baseline solution qData sent to rover
nRover sends approximate position to RTN Server oServer computes corrections for rover position pServer computes “virtual” observations for a nearby virtual base station Technology transparency
RTN Implementations Master-Auxiliary Concept (MAC) Rover sends approximate position to RTN Server Server selects RTN station nearest to rover as “Master” station Server applies network corrections to Master and rover data Server computes correction differences between Master and Auxiliary stations Data sent to rover Rover computes single or multiple base RTK baselines
Technology transparency
RTN and the Surveyor Î RTN supported
Construction Design As-built
Analysis GIS
Survey
New Facilities Planning
Operations GIS
Enabling Technology • • • • • •
Faster Processing Increased Bandwidth Larger Storage Web Services Standards Desktop Mobile Technologies Real Time Networks
• GIS Software
Servers
Web Services Laptop
Scalable Networked Hardware
PDA
GIS Servers
Phone
. . . Improving Our Ability To Share and Distribute
GIS Server Technology fusion aids data integration Desktop Explorer Web Map Mobile Viewer
Open APIs
Enterprise Service Bus
3 Tiers Use
Metadata Services
Globe Services
Map Services
Analysis & Modeling Services
Image Services
Open OGC Services
Serve
Author
RTN fits here, right? Î
Georeferenced data is Driving integration
Wrong!, Well, not entirely…
Server GIS Managing a Network of Sensors Many ways to author data • • • • • • •
Aircraft Traffic Business Weather Census Construction Demographic Geophysical • Gravity • Geodesy • Oceanographic • Atmospheric • Seismic • Tsunami • Infrastructure • Lightning
• Monitors
• Real-time Network • • • • •
RFID Satellite Surveying Streams Etc.
Services
ArcGIS Server
Survey / RTN provides consistent framework
Server GIS Managing a Network of Sensors What does this real-time stream sensor network have in common with an RTN?
RTN is ALSO a sensor network!
RTN as a Global Network of Sensors Practical and scientific role of RTN Geodatabase
GIS Server
GGOS / GEOSS
Visualize
Model ArcGeodesy Geodetic Data Model
T1
Analyze
• • • • •
• •
Ionosphere Troposphere Geodynamics Reference Frame Sea-level
RTN as a geodetic Sensor Network
Position/RTK Network corrections
Earth Science Contribution of RTN Earth observation refers to the collection, processing, modeling, and dissemination of data about the Earth system. These data are collected through in situ, airborne and space-based observations, using satellites, buoys, seismometers, and other devices. They then can be processed into forecasts, maps, and other decision support tools, providing valuable and often life-saving information to end users. -Group on Earth Observations GEO Secretariat Switzerland http://www.earthobservations.org/about/about_GEO.html http://www.earthobservations.org/about/about_GEO.html
Geodetic Contribution of RTN IAG's Global Geodetic Observing System GGOS is the Global Geodetic Observing System of the International Association of Geodesy (IAG). It provides observations of the three fundamental geodetic observables and their variations, that is, the Earth's shape, the Earth's gravity field and the Earth's rotational motion. motion. GGOS integrates different geodetic techniques, different models, different approaches in order to ensure a longlongterm, precise monitoring of the geodetic observables in agreement with the Integrated Global Observing Strategy (IGOS). GGOS provides the observational basis to maintain a stable, accurate and global reference frame and in this function is crucial for all Earth observation and many practical applications. GGOS contributes to the emerging Global Earth Observing System of Systems (GEOSS) not only with the accurate reference frame required for many components of GEOSS but also with observations related to the global hydrological cycle, the dynamics of atmosphere and oceans, and natural hazards and disasters. disasters. GGOS acts as the interface between the geodetic services and external users such as GEOSS, IGOSIGOS-P, and United Nations authorities. A major goal is to ensure the interoperability of the services and GEOSS. With this the geodetic community can provide the global geosciences community with a powerful tool consisting mainly of high quality services, services, standards and references, and of theoretical and observational innovations. © GGOS (Pages still under Development, welcome to comments, text and picture content, which should be sent to weisse@[email protected] or post comments into the Open Forum), Last update: 14:53 26/10 2005
Real Time Network
GPS Base Stations
ArcGIS Server manages survey data
@ Author
Internet
@
Rover
@
@ @
Desktop
Use
Serve
Web Map Viewer
ArcGIS Server
Mobile
Open APIs
Enterprise Service Bus
National Geodetic Survey Control Initiative National Spatial Reference System, NSRS Geodetic Control as a Web Service • Single source for control • Tier control • Standardized Data Models • Data Sharing Agreements • Access can be open or limited • Encourages use of survey control • Consistent data to all users • . . . And a Spirit Of Collaboration
NSRS Database
ArcGIS Server
The Road Ahead ESRI seeks your participation . . . ArcGeodesy – a comprehensive geodetic data model
Geodetic Tools & Applications Leveling Gravity
Interoperability GPS on BM •Ellipsoidal geometry •Geoid modeling •Network adjustments •Geodetic parameters
•Terrestrial geodesy •Satellite geodesy •Gravity
ESRI CORS / RTN GPS Tracking Station •PBO Class construction •Submit to NGS and PBO •Stream all data types •Data will be free •ESRI managed •Real-time data stream into GDB
@ “ESRI”
Geoid Model
Real time GPS Networks (RTN) and their Implications with
Geographic Information Systems (GIS)
Thanks!
Kevin M. Kelly, M.A.Sc., OLS Geodesist Redlands, CA [email protected]
