““The Case for Continuing and The Case for Continuing and Strengthening NDGPS in Strengthening NDGPS in

Louisiana” Louisiana”

Roy K. Dokka, Ph.D. Roy K. Dokka, Ph.D. Center for GeoInformatics and Center for GeoInformatics and Louisiana Spatial Reference CenterLouisiana Spatial Reference CenterLouisiana State University, Louisiana State University, Baton Rouge, LA 70803Baton Rouge, LA 70803

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Why do we need the NDGPS system in Why do we need the NDGPS system in Louisiana?Louisiana?

Why do we need it right now? Why do we need it right now?

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NOAA told the U.S. Congress in NOAA told the U.S. Congress in 2001 that the system used to 2001 that the system used to measure elevations in LA was,measure elevations in LA was,

Louisiana: A vulnerable landscape with a Louisiana: A vulnerable landscape with a constantly changing geodetic control systemconstantly changing geodetic control systemLouisiana: A vulnerable landscape with a Louisiana: A vulnerable landscape with a

constantly changing geodetic control systemconstantly changing geodetic control system

““inaccurate and inaccurate and obsolete and unable toobsolete and unable tosupport public safety.” support public safety.”

Bad vertical control affects levees, planning, evacuation roads, FEMA flood maps, and LiDAR.

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LSU’s Role in Fixing the LSU’s Role in Fixing the ProblemProblem

Creation of GULFNet GPS Reference Network across Creation of GULFNet GPS Reference Network across South LouisianaSouth Louisiana

42 CORS. Users can access the National Spatial Reference System anywhere in 42 CORS. Users can access the National Spatial Reference System anywhere in Louisiana with confidence. Louisiana with confidence. Think of CORS as “smart benchmarks”.Think of CORS as “smart benchmarks”. GULFNet GULFNet is updated daily and will remain accurate into the future without costly re-is updated daily and will remain accurate into the future without costly re-observations. Heights recognized as legal under Louisiana State law. observations. Heights recognized as legal under Louisiana State law. www.ngs.noaa/CORS

Creation of a State-wide Real-time NetworkCreation of a State-wide Real-time Network GULFNet real-time kinematic GPS RTN network allows users to obtain accurate GULFNet real-time kinematic GPS RTN network allows users to obtain accurate

and precise 3-D positions anywhere-anytime in Louisiana. Precision: 1 cm and precise 3-D positions anywhere-anytime in Louisiana. Precision: 1 cm Horiz., 2 cm Vert. Users can obtain 2004.65 elevations by site calibration.Horiz., 2 cm Vert. Users can obtain 2004.65 elevations by site calibration.

TrainingTrainingProvide know-how to enable users to exploit the new resources.Provide know-how to enable users to exploit the new resources.

““Positioning Louisiana for the future”Positioning Louisiana for the future”

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What is the overall strategyWhat is the overall strategyregarding 3-D positioning in LA?regarding 3-D positioning in LA?

The ability to obtain accurate 3-D positions has always The ability to obtain accurate 3-D positions has always been a shared responsibility between NGS, local been a shared responsibility between NGS, local government, surveyors, and others.government, surveyors, and others.

NGS is committed to providing users in LA with access NGS is committed to providing users in LA with access to the NSRS. This means maintaining a basic backbone to the NSRS. This means maintaining a basic backbone of about a hundred benchmarks in south Louisiana, of about a hundred benchmarks in south Louisiana, supporting CORS, development of technical standards.supporting CORS, development of technical standards.

C4G will provide state-wide GNSS technology to C4G will provide state-wide GNSS technology to facilitate accurate and precise “anywhere-any time” 3-D facilitate accurate and precise “anywhere-any time” 3-D positioning. positioning.

Local people will have to decide how they wish to Local people will have to decide how they wish to access the NSRS. NGS and C4G are dedicated to access the NSRS. NGS and C4G are dedicated to helping individual parishes craft viable local solutions helping individual parishes craft viable local solutions to meet local needs and $$ issues. to meet local needs and $$ issues.

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Error is 1 cm Horiz.2cm Vert.,

EVERYWHERE!

GULFNetGULFNetRTNRTN

Based on LSU GULFNet CORS, the most Based on LSU GULFNet CORS, the most reliable component of the National Spatial reliable component of the National Spatial Reference System in Louisiana. Reference System in Louisiana.

Fully implemented in Louisiana. Includes Fully implemented in Louisiana. Includes stations in Texas and Mississippi.stations in Texas and Mississippi.

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RTN Real-Time NetworkRTN Real-Time NetworkBased on VRS technologyBased on VRS technology

““Positioning anywhere,Positioning anywhere,any time”any time”

Cellular device toCellular device toconnect user toconnect user toInternet and LSUInternet and LSUGULFNet RTNGULFNet RTN

Kinematic mode:Kinematic mode:++ 0.3 ft (1 sec.) 0.3 ft (1 sec.)

Relative vertical:Relative vertical:++ 2 cm (3 min.) 2 cm (3 min.)

Native output in “CORS 2002” but can easilyNative output in “CORS 2002” but can easilybe put in 2004.65 context through calibration.be put in 2004.65 context through calibration.

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The Louisiana Legislature requested LSUThe Louisiana Legislature requested LSUmeasure the height of the South LA HPSmeasure the height of the South LA HPSin 2006-2007. N = 50,000 pointsin 2006-2007. N = 50,000 points

Note: Does not reflect Note: Does not reflect post 2007 changes post 2007 changes Due to construction by Due to construction by USACEUSACE

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With the GULFNet With the GULFNet system, why do we system, why do we need the NDGPS?need the NDGPS?

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NDGPS is still needed NDGPS is still needed because GULFNet is . . . . . because GULFNet is . . . . .

• not likely to be operational following a not likely to be operational following a major hurricane because of damage tomajor hurricane because of damage to cellular and internet communications.cellular and internet communications.• limited by cellular coverage, whereaslimited by cellular coverage, whereas the NDGPS signals are everywhere.the NDGPS signals are everywhere.• land-centric, whereas NDGPS is also land-centric, whereas NDGPS is also offshore.offshore.

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NDGPS is still needed NDGPS is still needed because GULFNet is . . . . . because GULFNet is . . . . .

• not likely to be operational following a not likely to be operational following a major hurricane because of damage tomajor hurricane because of damage to cellular and internet communications.cellular and internet communications.• limited by cellular coverage, whereaslimited by cellular coverage, whereas the NDGPS signals are everywhere.the NDGPS signals are everywhere.• land-centric, whereas NDGPS is also land-centric, whereas NDGPS is also offshore.offshore.

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What else could be done?

Adding more corrections to the broadcast signal.

LSU can create an array of virtual CGPS stations to better blanket the state.

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Thank You!Thank You!