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Benefits of Networked GNSS Infrastrucutre<br />
for Land Administration Applications<br />
India Geospatial Forum, New Delhi<br />
8 th Feb 2012<br />
Tan Siew Siong<br />
Trimble Infrastructure Div.
Source: P. MISRA – COORDINATES June 2005,<br />
• Evolution of Survey<br />
Instrumentation<br />
• Follows principle of<br />
surveying<br />
• GPS/GNSS Accepted<br />
instrumentation<br />
• Affordable, fast,<br />
accurate<br />
• Simple to learn & use
Principle of Surveying
Trimble GNSS Networks<br />
>200 Networks >4,000 CORS >40 Countries<br />
Sweden<br />
Canada<br />
USA<br />
Norway<br />
Finland<br />
Denmark<br />
New<br />
Caledonia<br />
Iceland<br />
Belgium<br />
Chile<br />
Estonia<br />
Ireland<br />
Brasil<br />
USACE<br />
Costa Rica<br />
UNAVCO<br />
Jamaica<br />
Spain<br />
Italy<br />
Portugal<br />
Ecuador<br />
Russia<br />
Bangladesh<br />
Puerto Rico<br />
Rep. South Africa<br />
United<br />
Kingdom<br />
India<br />
2012 View<br />
Lithuania<br />
Germany<br />
Poland<br />
Croatia<br />
Greece<br />
France<br />
Benin<br />
Austria<br />
Slovakia<br />
Albania<br />
Turkey<br />
Burkina Faso<br />
Poland<br />
Switzerland<br />
Taiwan<br />
Japan<br />
Hong Kong<br />
Corsica<br />
KSA<br />
Slovenia<br />
China<br />
South Korea<br />
Thailand<br />
Malaysia<br />
Singapore<br />
Australia<br />
Czech Republic<br />
Brunei<br />
New Zealand<br />
Serbia and<br />
Montenegro<br />
Saudi Arabia
GNSS Networking<br />
Real-Time Correction Services<br />
More than 4000 stations powered by Trimble<br />
infrastructure software<br />
Eliminating/mitigating errors like orbit,<br />
ionosphere, troposphere<br />
Real-time corrections to RTK rovers via<br />
GPRS/3G/4G modems<br />
cm-accurate RTK positioning in a unified<br />
coordinate frame<br />
Better accuracy, reliability, productivity<br />
International standard, e.g. RTCM
Trimble VRS –
Trimble VRS – Proven Best method<br />
University of Nottingham report<br />
– RTCM3Net (MAC) methods v Trimble VRS<br />
– Service delivery comparisons<br />
Observed values for point<br />
STRE using MAC purple v<br />
VRS (pink). Source: An<br />
examination of commercial<br />
network RTK services in<br />
Great Britain, Newcastle<br />
University (2008), Report<br />
for TSA, download at<br />
http://www.tsa-uk.org.uk/
Trimble VRS – IONO Modeling<br />
Iono modeling technique<br />
– Designed by Trimble for 50-100km interstations<br />
spacing: only model at this<br />
resolution<br />
– Reduces ionosphere to single layer and<br />
calculates slant angle the satellite signal<br />
travels on<br />
Source: Kolb, P.F., Chen, X,<br />
Vollath, U., “An new method to<br />
model the ionosphere across<br />
local area networks”, ION GNSS<br />
18th International Technical<br />
Meeting of the Satellite Division,<br />
13-16 September 2005, Long<br />
Beach, CA.
Scalable GNSS Infrastructure –<br />
implementation<br />
Scalable design & planning a reference network towards cmaccuracy<br />
– aka POB<br />
1. Real time Sparse CORS model<br />
2. Sparse VRS @ >100Km station spacing producing 10 cm<br />
(Horizontal)<br />
3. To regional (island) Densification @ 50Km to achieve 2-3 cm<br />
accuracy<br />
4. Scalable - Continuous refinement of accuracy over time
Implementation<br />
Established State level GNSS Network<br />
Tied to National Geodetics Network<br />
Unified Survey Datum<br />
Transformation to local coordinate<br />
– provides coordinate transformation from<br />
the global system used by the GNSS<br />
satellites into a local coordinate system at<br />
the rover..
GNSS Network – unified Datum<br />
Common Data<br />
Management Platform
Urban Survey
Village Survey<br />
Rugged GNSS handheld<br />
Light weight, compact<br />
Affordable<br />
Accuracy up to 10cm
Benefits<br />
No searching for pillar/monument/marker<br />
Connect & Measure – simple to use<br />
Local coordinate system – TTG<br />
No security issue<br />
Rapid establishment of Control Points<br />
Rapid demarcation of property boundary<br />
Recovery of missing property pillars<br />
Integrated data collector – attributes<br />
related to property
Benefits (2)<br />
Once build - Multiple purpose GNSS Networks<br />
Positioning with cm-accuracy<br />
GNSS Monitoring<br />
GNSS Meteorology
Summary<br />
Networked GNSS - Principle of<br />
Surveying<br />
International standard for Precise<br />
Surveying “Datum”<br />
Concept of VRS – Connect, Correct,<br />
Measure<br />
Trimble Rover - Affordable fast, simple<br />
to learn/use<br />
Scalable implementation – Planning<br />
Benefits of Network GNSS<br />
17
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