RECTIFYING Louisiana CORS Networks with Vertical Datum Requirements November 2012

RECTIFYINGLouisiana CORS Networks

withVertical Datum Requirements

November 2012

Stephen Estopinal, P.E., P.L.S.

PROBLEMS FACING HEIGHT IN SOUTH LOUISIANA

Subsidence Network Adjustments (epoch)

Geoid Model Updates

GPS DERIVED

ORTHOMETRIC HEIGHT

(Elevation)

The orthometric height is calculated from the ellipsoidal and geoidal separation.

GEOID

Each published Geoid is an

attempt to model Earth’s

equipotential surface

The TED Example

The case for 1 cm level geiod

Height of PBM "TED"

5

5.1

5.2

5.3

5.4

5.5

5.6

5.7

5.8

5.9

6

Height of TED

Hei

gh

t (U

S f

t)

Monument ALCO

Monument C189

Monument REGGIO 2

Monument WasteWell 2 RESET

NGS COR Station

Monuments ALCO,C189, REGIO 2

NGS OPUS

C4GNET

LEICA SMARTNET

ST

AT

IC

ST

AT

IC

ST

AT

IC

ST

AT

IC

ST

AT

IC

ST

AT

IC

ST

AT

IC

RT

N

RT

N

POTENTIAL PROBLEMS

DEEP ROD MARKS

Available to all users;

GPS Equipment optional;

Will monitor deep subsidence

and near surface movement;

Provide platforms for

Absolute Gravity Meters;

Develop research data for

Coastal Restoration designs.

Stephen Estopinal, P.E., P.L.S.

Stephen.Estopinal @ SJBGroup.com

QUESTIONS???

Office (225) 769-3400

Fax (225) 769-3596