GEODETIC%20INFRASTRUCTURE

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GEODETIC INFRASTRUCTURE

• Walter Volkmann
• Manager of Technical Operations
• L. D. Bradley Land Surveyors
• Gainesville, Florida

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GEODETIC INFRASTRUCTURE

• Brief History

Pre-Satellite Epoch

• Astronomical Observations (Laplace Fixes) Base
  Line Extensions with Classical Triangulation
  (10ppm)
• Spirit Levelling
• 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
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GEODETIC INFRASTRUCTURE
Satellite Epoch

• Doppler Surveys - World wide coverage, absolute
  positioning accurate to 1m. Highly specialized
  application.
• GPS - Global, diverse applications with
  accuracies from 30m to mm (1ppm)
• GNSS GPS, Glonass, Galileo?

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GEODETIC INFRASTRUCTURE

• Components

1. Physical Monumentation
2. Abstract Parts
3. Enhancing Facilities
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GEODETIC INFRASTRUCTURE
PHYSICAL MONUMENTATION
Stable and Permanent
Protected by Law (Public Property)
Accessible
Appropriate density
Visibility conditions
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GEODETIC INFRASTRUCTURE
NUMERICAL AND VERBAL ATTRIBUTES
3D Position, XYZ f?he on specified datum and
ref ellipsoid
Accuracy Statement
Description (digital photo)
Visibility conditions
Recovery notes
Ideally this info should be maintained in an
internet accessible database which allows users
to contribute to the recovery history
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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.
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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
AQ2646SATELLITE SATELLITE OBSERVATIONS -
November 10, 2006 AQ2646_ROD/PIPE-DEPTH 24.4
meters AQ2646_SLEEVE-DEPTH 0.9 meters
AQ2646 HISTORY - Date Condition
Report By AQ2646 HISTORY - 1988
MONUMENTED NGS AQ2646 HISTORY -
19890424 GOOD AQ2646 HISTORY - 19890530
GOOD AQ2646 HISTORY - 19931014 GOOD
NGS AQ2646 HISTORY - 19950110 GOOD
KEISCH AQ2646 HISTORY - 19960218
GOOD FLDEP AQ2646 HISTORY -
20030820 GOOD FLDEP AQ2646 HISTORY
- 20050109 GOOD FLDEP AQ2646
HISTORY - 2006 GOOD FLDEP
AQ2646 HISTORY - 20061110 GOOD
BAKER
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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)
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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
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GEODETIC INFRASTRUCTURE
MODERN FEATURES
SERVICE CERTIFICATION
TELEMETRY STANDARDS
MOORES LAW!!!!!!!!!!!!!!!!!!!!!!
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GEODETIC INFRASTRUCTURE
OPERATING EXAMPLE