Transcript GEODETIC INFRASTRUCTURE

GEODETIC INFRASTRUCTURE
Walter Volkmann
Manager of Technical Operations
L. D. Bradley Land Surveyors
Gainesville, Florida
GEODETIC INFRASTRUCTURE
Brief History
Pre-Satellite Epoch
1. Astronomical Observations (Laplace Fixes) & Base Line Extensions
with Classical Triangulation (10ppm)
2. Spirit Levelling
3. Introduction of EDM - control of scale in triangulation networks,
geodetic traversing with astro. Obs. to control orientation
Cumbersome and slow
Ad Hoc extensions of network, often disconnected
Difficult to maintain homogeneity across country
Horizontal separate from vertical
GEODETIC INFRASTRUCTURE
Satellite Epoch
1. Doppler Surveys - World wide coverage, absolute positioning accurate
to 1m. Highly specialized application.
2. GPS - Global, diverse applications with accuracies from 30m to mm
(1ppm)
3. GNSS – GPS, Glonass, Galileo?
GEODETIC INFRASTRUCTURE
Components
1. Physical Monumentation
2. Abstract Parts
3. Enhancing Facilities
GEODETIC INFRASTRUCTURE
PHYSICAL MONUMENTATION
Stable and Permanent
Protected by Law (Public Property)
Accessible
Appropriate density
Visibility conditions
GEODETIC INFRASTRUCTURE
NUMERICAL AND VERBAL ATTRIBUTES
3D Position, XYZ & φλhe on specified datum and ref ellipsoid
Accuracy Statement
Description (digital photo)
Recovery notes
Visibility conditions
Ideally this info should be maintained in an internet accessible database
which allows users to contribute to the recovery history
GEODETIC INFRASTRUCTURE
AQ2646
*CURRENT SURVEY CONTROL
AQ2646 ___________________________________________________________________
AQ2646* NAD 83(2007)- 29 58 59.99370(N) 081 45 05.91906(W)
ADJUSTED
AQ2646* NAVD 88
20.74 (meters)
68.0 (feet) GPS OBS
AQ2646 ___________________________________________________________________
AQ2646 X
793,238.641 (meters)
COMP
AQ2646 Y
- -5,471,977.426 (meters)
COMP
AQ2646 Z
- 3,168,769.766 (meters)
COMP
AQ2646 LAPLACE CORR-0.88 (seconds)
DEFLEC99
AQ2646 ELLIP HEIGHT-7.308 (meters)
(02/10/07) ADJUSTED
AQ2646 GEOID HEIGHT-28.05 (meters)
GEOID03
AQ2646
AQ2646 ------- Accuracy Estimates (at 95% Confidence Level in cm) -------AQ2646 Type PID Designation
North East Ellip
AQ2646 ------------------------------------------------------------------AQ2646 NETWORK AQ2646 FLGPS 31
1.12 0.96 2.25
AQ2646 ------------------------------------------------------------------AQ2646
AQ2646.The horizontal coordinates were established by GPS observations
AQ2646.and adjusted by the National Geodetic Survey in February 2007.
AQ2646.The orthometric height was determined by GPS observations and a
AQ2646.high-resolution geoid model using precise GPS observation and
AQ2646.processing techniques. It supersedes the leveled height previously
AQ2646.determined for this station.
AQ2646.The ellipsoidal height was determined by GPS observations
AQ2646.and is referenced to NAD 83.
AQ2646
AQ2646.The geoid height was determined by GEOID03.
GEODETIC INFRASTRUCTURE
AQ2646_U.S. NATIONAL GRID SPATIAL ADDRESS: 17RMP2749217176(NAD 83)
AQ2646_MARKER: F = FLANGE-ENCASED ROD
AQ2646_SETTING: 59 = STAINLESS STEEL ROD IN SLEEVE (10 FT.+)
AQ2646_SP_SET: STAINLESS STEEL ROD IN SLEEVE
AQ2646_STAMPING: FLGPS 31 1988
AQ2646_MARK LOGO: NGS
AQ2646_PROJECTION: FLUSH
AQ2646_MAGNETIC: N = NO MAGNETIC MATERIAL
AQ2646_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
AQ2646_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
AQ2646+SATELLITE: SATELLITE OBSERVATIONS - November 10, 2006
AQ2646_ROD/PIPE-DEPTH: 24.4 meters
AQ2646_SLEEVE-DEPTH : 0.9 meters
AQ2646 HISTORY
AQ2646 HISTORY
AQ2646 HISTORY
AQ2646 HISTORY
AQ2646 HISTORY
AQ2646 HISTORY
AQ2646 HISTORY
AQ2646 HISTORY
AQ2646 HISTORY
AQ2646 HISTORY
AQ2646 HISTORY
- Date
Condition
Report By
- 1988
MONUMENTED
NGS
- 19890424 GOOD
- 19890530 GOOD
- 19931014 GOOD
NGS
- 19950110 GOOD
KEISCH
- 19960218 GOOD
FLDEP
- 20030820 GOOD
FLDEP
- 20050109 GOOD
FLDEP
- 2006
GOOD
FLDEP
- 20061110 GOOD
BAKER
GEODETIC INFRASTRUCTURE
MODERN FEATURES
Continiously Operating Reference Stations (CORS)
Raw observations archived and streamed to internet
Connection to internet via land lines or cell phone
Users can retrieve archived obs for in house post processing
Users can submit (on Line) own obs to processing center for
post processing of base lines (OPUS)
GEODETIC INFRASTRUCTURE
MODERN FEATURES
Real Time Applications
Single Base Line real time solutions – range limits because of
ionospheric effects
Virtual Reference Station Technology – eliminates ionospheric
effects and serves differential corrections over wide areas
Significant improvements in efficiency
Automated control over datum usage
Powerful tool to migrate spatial data from superseded to current datum
Opportunities for online collaboration – Public/Private – Field/Office
Autonomous field operations
GEODETIC INFRASTRUCTURE
MODERN FEATURES
SERVICE CERTIFICATION
TELEMETRY STANDARDS
MOORE’S LAW!!!!!!!!!!!!!!!!!!!!!!
GEODETIC INFRASTRUCTURE
OPERATING EXAMPLE