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National Readjustment
Geodesist, Texas State Advisor
National Geodetic Survey
Texas Society of Professional Surveyors
October 2007
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NATIONAL READJUSTMENT
• WHAT?
• WHY
• HOW
• WHEN
• POST
• QUESTIONS
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NATIONAL SPATIAL REFERENCE SYSTEM
• A component of the National Spatial Data Infrastructure (NSDI) - http://www.fgdc.gov/nsdi/nsdi.html
• Contains all geodetic control contained in the National Geodetic Survey (NGS) Integrated Data Base:– Horizontal and vertical control points– Geoid models such as GEOID 03– Gravity– Precise GPS orbits– Continuously Operating Reference Stations (CORS)– National Shoreline data as observed by NGS– Standards and Specifications for data submittal
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NATIONAL SPATIAL REFERENCE SYSTEM
• MULTIPURPOSE – Supports Geodesy, Geophysics, Land Surveying, Navigation, Mapping, Charting and GIS
• ACTIVE – Accessible through Continuously Operating Reference Stations (CORS) and derived products
• INTEGRATED – Related to International services and standards (e.g. International Earth Rotation Service, International GPS Service etc.)
• DOCUMENTED – Complete metadata is provided for elements.
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NATIONAL GEODETIC SURVEY
WEB SITE
http://www.ngs.noaa.gov
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NATIONAL READJUSTMENT
WHAT
WHY?
HOW
WHEN
POST
QUESTIONS
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The NAD83(86) Adjustment Team
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NAD83(86) DOPPLER STATIONS
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Guess who …
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COMPARISON OF DATUM ELEMENTS
NAD 27 NAD 83ELLIPSOID CLARKE 1866 GRS80 a=6,378,206.4 m a=6,378,137 m 1/f = 294.9786982 1/f = 298.257222101
DATUM POINT Triangulation Station NONE Meades Ranch, Kansas Earth Mass Center
ADJUSTMENT 25k Stations 250k Stations few hundred Base lines 30k EDMI base lines
few hundred Astro Az 5k Astro Azimuths
Doppler and VLBI
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NAD 27 and NAD 83
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Results of NAD83(86)
• Network Accuracy - 1 Meter
• Local Accuracy – First-Order (1 part in 100,000)
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NAD 83(86) NETWORK PROBLEMS
Not “GPSABLE”
POOR STATION ACCESSIBILITY
IRREGULARLY SPACED
POSITIONAL ACCURACY
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HIGH PRECISION GPS NETWORKS
“GPSABLE”Clear Horizons for Satellite Signal Acquisition
EASY ACCESSIBILITYFew Special Vehicle or Property Entrance
Requirements
REGULARLY SPACEDAlways within 20-100 Km
HIGH HORIZONTAL ACCURACYA-Order (5 mm + 1:10,000,000)B-Order (8mm + 1:1,000,000)
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HARN/HPGN ADJUSTMENT
A-Order Adjusted to VLBI-Existing FBN-CORS
B-Order Adjusted to A-Order
Existing Horizontal (Conventional & GPS) Readjusted to A/B-Order
New Adjustment Date Tag e.g. NAD83(1991.35)
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HIGH ACCURACY REFERENCE NETWORK
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GPS & CLASSICAL ADJUSTMENTS COMPLETED
GPS ADJUSTMENT COMPLETED
1990
-GPS1
70
1990-GPS120
1991GPS222
1992GPS366
1997GPS11791992
GPS412
1992 GPS3831992
GPS450
1992GPS419
1992GPS394
1992GPS341
1993
1993
GPS585
1993 GPS667
1992GPS376
1995GPS887
1997.
GPS577
1991GPS197
GPS2601991
1995GPS908
GPS610
1993
GPS725
HPGN/HARN & STATEWIDE NETWORK STATUS
1993
1994GPS404
GPS611
1994GPS633
1991 GP S291 reobs 9/97
1994 GPS721
reos 7/96 GPS1047
reos 1/96 GPS936
1997GPS1133
reos-6/95-GPS904
1995GPS852
1995GPS882
1993GPS606
1996GPS1048 1996
GPS8051996GPS941 1994
GPS7301996GPS1121
1997GPS1178
1997 GPS 12001997
GPS1150
reos-1996
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Official policy FEDERAL BASE NETWORK
NGS funded and MaintainedMinimum 100 KM station spacing
Local ACCURACIES
Horizontal: 1-cm.Ellipsoid height: 2-cm
NAVD 88: 3-cmGravity: 50 micro-gals
REVISIT EVERY 3 TO 5 YEARS
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FEDERAL BASE NETWORK
NGS FUNDEDNGS MARK MAINTENANCE
MINIMUM 100 KM STATION SPACINGA and B-ORDER HORIZONTAL ACCURACY
FIRST-ORDER CLASS II ORTHOMETRIC HEIGHTS or
SECOND-ORDER CLASS I ORTHOMETRIC HEIGHTSSECOND-ORDER CLASS I ELLIPSOIDAL HEIGHTS
REVISIT EVERY 3 TO 5 YEARS
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FBN GPS ADJUSTMENT COMPLETED
FBN/CBN SURVEYS
GPS READJUSTMENT COMPLETED
1999GPS1347
1998GPS1273
1997GPS1250
1998GPS1267 1998
GPS1264
1998
GPS1258
1999GPS1394
1999GPS1397
1997GPS1207
1999GPS1378
1999GPS1370
1999GPS1356
1998GPS1288
1998GPS1333
1998GPS1340
1999GPS1377
1999GPS1381
1999GPS1399
2000GPS1411
2001 GPS1629
2000 GPS1463
2000
GPS1462
2000 GPS1481
2000 GPS1492
2000 GPS1506
2000 GPS1514
2000 GPS1519
2000 GPS1530
2000 GPS1188
2001 GPS1712
2001GPS1554
2001GPS1641
2001 GPS1596
2002 GPS1686
2002 GPS1687
2002 GPS1731
2003 GPS1752
2003
GPS1825
2003 GPS1851
2003 GPS1753
2003 GPS 1850 MEANS
2003 GPS1682WILLIAMS
2003 GPS1726 2002
GPS-1547
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http://www.ngs.noaa.gov/PROJECTS/FBN/
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http://www.ngs.noaa.gov/PROJECTS/FBN/
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NGS Map version
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Old Datasheet format
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Difference is:
DN = -0.644 (m)
DE = +0.712 (m)
DU = 1.195 (m)
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IMPROVING POSITIONAL ACCURACY
TIME NETWORK LOCALNETWORK SPAN ACCURACY ACCURACY
NAD 27 1927-1986 10 METERS (1 part in 100,000)
NAD83(86)1986-1990 1 METER (1 part in 100,000)
HARN 1990-1997 0.1 METER B-order (1.0 ppm) A-order (0.1 ppm)
CORS 1996 - 0.01 meter 0.01 meter
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Reasons for Readjustment
• Multiple epoch dates• Inconsistencies between states• Need to be Consistent with CORS• Compute Network and Local accuracies
September 24, 2003 NGS Executive Steering Committee approved a plan for the readjustment of the horizontal positions and ellipsoid heights for GPS stations in the contiguous United States.
Orthometric Height adjustment will not be attempted
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What about Orthometric Heights?
Decision was made not to perform a National Readjustment of orthometric heights at this time Control = NAVD 88 not the CORS Since no change in control most orthometric elevations
would not change significantly Network & Local Accuracy numbers for the orthometric
heights would be the primary reason for readjustment Would require relevant network accuracies for the
NAVD 88 network-This would require a complete analysis of the NAVD 88 network
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Heights
h – H – N = 0 + errors in components
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Tectonic Plates NUVEL-1A
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http://tsrc.cbi.tamucc.edu/THM/HomePage
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Geoid Modeling Issues
• The new ellipsoid heights will be used in the next hybrid geoid model.
• Future efforts will center on improvements to our gravity data.
• NGS has acquired an airborne gravity meter.• We plan a comprehensive set of observations
to capture gravity throughout the United States and our possessions.
• Airborne gravity data supplements terrestrial and satellite based gravity.
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Gravity
Recovery
And
Climate
Experiment
http://www.csr.utexas.edu/grace/
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NATIONAL READJUSTMENT
WHAT
WHY
HOW?
WHEN
POST
QUESTIONS
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NGS Adjustment Team (1986)NGS Adjustment Team (2005)
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NAD 83 READJUSTMENT
ONLY GPS DATA WAS USED
CONTINUOUSLY OPERATING REFERENCE STATIONS (started in 1994)
FEDERAL BASE NETWORK (A & B)COOPERATIVE BASE NETWORK (B)
USER DENSIFICATION NETWORK (First)AIRPORT SURVEYS (B & First)
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COOPERATIVE BASE NETWORK
STATE/LOCAL FUNDEDSTATE/LOCAL MARK MAINTENANCE
25 TO 30 KM STATION SPACINGB-ORDER HORIZONTAL ACCURACY
THIRD-ORDER CLASS I ORTHOMETRIC HEIGHTTHIRD-ORDER CLASS I ELLIPSOIDAL HEIGHT
REVISIT AS NEEDED
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USER DENSIFICATION NETWORK
STATE/LOCAL FUNDEDSTATION SPACING AS REQUIRED
GPS OBSERVATIONS ONLY (HORIZONTAL)FIRST-ORDER HORIZONTAL ACCURACY
This data was observed, reduced and adjusted by outside entities. NGS
reviewed the projects for ties, adjustment constraints, over-all results. Until
recently, they were not required to tie to CORS.
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PHASE I PLANNING - RECONPHASE I OBSERVEDPHASE I PROCESSEDPHASE II OBSERVEDPHASE II PROCESSEDPHASE II RELEASEDPHASE III PLANNEDPHASE III PHOTOPHASE III OBSERVEDPHASE III PROCESSEDPHASE III RELEASED
ANA STATUS 10/31/2004
AIRPORT SURVEYS
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Project Adjustment Analysis
3375 Projects complete Free Adjustment Residual Plot Outliers Rejected Connectivity to A/B Order Network Verified Summary sheet with Project Information Created 69117 stations
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TRASH
Projects Not Recommended for Inclusion Currently 149 Projects with 9903 stations
Many Third Order FAA Projects from 1980’sSome Projects that have no ties to the NetworkOriginal TN HARN (Macrometer Data in 1990) Original Eastern Strain Network Project
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Texas Projects eliminated
• 17407• GPS078• GPS088• GPS1138• GPS1170/4• GPS146• GPS158• GPS288• GPS304• GPS407
GPS482GPS577GPS577/DGPS582GPS584GPS586GPS849/193
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Points in rejected projects.
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The National Readjustment General Comments
The CORS/CGPS sites were the control Only GPS projects participated The FBN/CBN Surveys are a key element since these are
high accuracy (2 cm) surveys that tie the HARN to the CORS throughout the contiguous United States and provide more accurate values for the ellipsoid heights of most HPGN stations.
The required free adjustment analysis of each GPS project that contributes to the National Spatial Reference System is complete.
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More Comments
Computation and database loading of scale factors for each project.
Statewide GPS Readjustments provided extra information about the network on a state-by-state basis.
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Concept of Operation
Helmert Blocking strategy used.
NETSTAT- New Helmert Blocking software developed for the entire adjustment process incorporating more quality control and significant time saving features.
Coordinates Produced and Published for both NAD83 (NSRS) and ITRF Adjustment in NAD83-Transformed to ITRF
Network and Local Accuracies Produced.
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Helmert Blocks
CORS/CGPS provides control at top block CGPS coordinates were determined by Sector projected
to the 2007.0 epoch.
Each state comprised a separate block of data except California which was broken into two blocks (North and
South)
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HB 1
HB 2
HB 3
HB 4
HB 5
HB8HB 9
HB16HB 17
FLGA AL MS
HB 18
NC SC
HB 19
HB 32
HB 33
HB10
HB11
HB 20
HB 21
HB 22
HB 23
HB 6
HB 7
HB 12
HB 13
HB 24
HB 25
HB 26
HB 27
HB 14
HB15
HB28
HB 29
HB 30
HB 31
HB 34
HB 35
HB 36
HB 37
HB 38
HB 39
HB 40
HB 41
HB 42
HB 43
HB 44
HB 45
HB 46
HB 47
HB 48
HB 49
HB 50
HB 51
OR WA CA AK PR VQ
VA WV MD PA DC DE NY NJ CT MA ME NH RI VT LA AR TN KY MO IL IN OH MI WI MN IA ND SD NE KS OK TX NM AZ CO UT NV ID MT WY
HELMERT BLOCKING STRATEGY
This is how each state fits into the National Readjustment
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Network Accuracy
Network accuracy of a control point A value that represents the uncertainty of its
coordinates with respect to the geodetic datum at the 95-percent confidence level
Datum is considered to be best expressed by the Continuous Operating Reference Stations (CORS)
Local and Network accuracy values at CORS sites are considered to be infinitesimal (approach zero)
These accuracies were implemented with the National Readjustment
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Local Accuracy
Local Accuracy of a control point: A value that represents the uncertainty of its
coordinates relative to other directly connected, adjacent control points at the 95-percent confidence level
An approximate average of the individual local accuracy values between this control point and other observed control points used to establish its coordinates
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NEW STANDARDS FOR GEODETIC CONTROL
(http://fgdc.er.usgs.gov/standards/status/swgstat.html)
• local accuracy -------------- adjacent points• network accuracy ---------- relative to CORS
• Numeric quantities, units in cm (or mm)• Both are relative accuracy measures• Will not use distance dependent expression• Order/Class codes will no longer be used
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Note that this position was formerly order “B” (1-ppm)
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Computations of accuracies
This is an extract from an OPUS extended solution.
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Annoying details
• A is a design matrix • L is a matrix of
observations• W is a weight matrix• X is the vector of
unknowns• Q is the variance-
covariance matrix (ATA)-1
X = ATWA-1*ATWL
V = A*X-L
σ2 = (VTWV)/DF
Accuracy of a quantity is determined by multiplying standard deviation of variances by diagonal element of the Q matrix.
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SHIFTS (National results)
< 5 cm. in the horizontal component with an average shift of 2.2 cm. < 10 cm. in the vertical component with an average shift of 4.6 cm.
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ISSUES
New realization of the CORS coordinates will not be available-we are recommending the use of 2002 coordinates as published. The new Policy statement is posted on the NSRS Readjustment webpage..
To be decided-will another adjustment be run after the next CORS realization (2005) is released and new CORS coordinates published.
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ITRF and WGS 84
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ITRF to NAD 83 (????)
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NSRS 2007 adjustment
Four free iterations completed with decreasing numbers of residuals over 5 cm and with decreasing variances in each block and overall. Analysis of each block continues.
No. of Observations = 851,073No. of constrained parameters = 2055No. of unknown parameters = 203,076Degrees 0f Freedom = 650,049
Constraints in adjustment: 471 National CORS, 3 Canadian CACS, 1 Mexican CORS and 213 California CGPS sites
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TEXAS STATISTICS
• Total # of Stations: 2400• Max Horizontal Shift: 0.208 (m)• Average Hz Shift: 0.016 (m)• Max Vertical Shift: 0.250 (m)• Average Vt. Shift: 0.018 (m)
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Texas NAD 83(NSRS 2007) Adjustment Statistics
Texas Final Free Adjustment: Variance = 0.70
2400 stations and 813 rejected vectors
Texas Final Constrained Adjustment: Variance = 1.38
Note the sole constraint for the national free adjustment (CORS site GAIT) and the 678 CORS/CGPS sites for the constrained adjustment.
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www.ngs.noaa.gov/NationalReadjustment
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http://www.ngs.noaa.gov/NationalReadjustment/StatusReports/Statistics.final/NewBB/tx.newbb.txt
Station position (lat, long, ell height)
Network Accuracy (lat, long, Hz correlation, ell height) at one-sigma. Units are centimeters
Local Accuracy (lat, long, correlation, ell hght)
Re-adjustment Distribution Format
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Same data in datasheet format
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Superseded values will also be shown
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NATIONAL READJUSTMENT
WHAT
WHY
HOW
WHEN?
POST
QUESTIONS
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Time-line for National Readjustment Positions and Ellipsoid Heights
All projects loaded in the NGS database prior to November 15, 2005 were included in the National Readjustment
Projects submitted after 11/15/2005 were accepted and loaded into the database but were not included in the readjustment
Completed adjustment by February 10, 2007 deadline
New Datasheets including new positions and network accuracies available NOW.
Project Report (pending)
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SNARF – Stable North American Reference Frame
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http://www.unavco.org/research_science/workinggroups_projects/snarf/snarf.html
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Velocities in ITRF
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Vertical velocities dominated by GIA
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We celebrated our 200th anniversary on February 10,
2007!!
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NATIONAL READJUSTMENT
WHAT
WHY
HOW
WHEN
POST?
QUESTIONS
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For Stations not Included
NGS recommends that NAD 83 data that is NOT part of the NSRS readjustment be readjusted by contractor/user with the original observations.
A set of national transformation parameters for “classical” non-GPS stations and GPS stations that were excluded from the National Readjustment will be developed by NGS.
Because of the relatively small shifts anticipated, a model such as NADCON will not be developed between previously determined GPS coordinates.
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Post National Readjustment
New adjustment procedures will be developed that incorporate local and network accuracies.
Design and Publish new data sheets.
A reference frame maintenance strategy (NAD83, ITRF, either or both) will be developed.
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Important Facts
– COMPLETION DATE – February 10, 2007– NEW DATUM TAG - NAD83(NSRS2007)
For the latest information- visit the national readjustment webpage at:
(http://www.ngs.noaa.gov/NationalReadjustment
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OTHER ISSUES
• We will streamline the process of project acceptance and database loading
• OPUS DB• Require that all projects (submitted after
the November 15, 2005 deadline) be tied to CORS
• Accept/require more data in digital format-e.g.. reports, logs…
• Photographs
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NATIONAL READJUSTMENT
WHAT
WHY
HOW
WHEN
POST
QUESTIONS?
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