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Val NoronhaUniversity of California, Santa Barbara
Transportation Centerlines: Case
Studies from California and Iowa
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RSPA/FDOT 2004-12-02 #2 © University of California. All rights reserved. N C R S T
Structure
U.S. DOT — NASAPartnership
Transportation Legislation “TEA-21”
Environment
Flows Hazards
Infrastructure
4 universities
4 TAPs
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RSPA/FDOT 2004-12-02 #3 © University of California. All rights reserved. N C R S T
Outline
What is a centerline?• Applications, requirements, status
Survey Methods• Remote sensing: eyeball, analytical• GPS: high-end, low-end• Photogrammetry
Tomorrow’s precision standards
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RSPA/FDOT 2004-12-02 #4 © University of California. All rights reserved. N C R S T
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RSPA/FDOT 2004-12-02 #5 © University of California. All rights reserved. N C R S T
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RSPA/FDOT 2004-12-02 #6 © University of California. All rights reserved. N C R S T
The Grapevine
Northbound and southbound carriageways of I-5 switch places for 6 km along the San Andreas Fault
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RSPA/FDOT 2004-12-02 #7 © University of California. All rights reserved. N C R S T
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RSPA/FDOT 2004-12-02 #8 © University of California. All rights reserved. N C R S T
Where is the Gore point?
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RSPA/FDOT 2004-12-02 #9 © University of California. All rights reserved. N C R S T
Centerline Applications
Application Long Lat
Market research 250m 250m
Emergency reporting 25m 5m
Highway operations 15m 2m
Lane tolls 15m 2m
Snow plowing 15m .2m
ITS 2020 .2m .1m
Who’s paying?
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RSPA/FDOT 2004-12-02 #12 © University of California. All rights reserved. N C R S T
Centerline databases — families
Pro
duce
rsU
sers
ITS
State, localDOT
USGS1:24K
State, local
Engineering
DesignCAD
Mapquest
TIGER
GDTNavtech
CVO/Logistics
RS RS RS
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RSPA/FDOT 2004-12-02 #13 © University of California. All rights reserved. N C R S T
Facets of centerline data
Existence: omission/commission Geometric accuracy (2-D) Linear accuracy Attributes
• name and address range, speed limit• lane width, shoulder width …
Topology Data model
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RSPA/FDOT 2004-12-02 #14 © University of California. All rights reserved. N C R S T
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RSPA/FDOT 2004-12-02 #15 © University of California. All rights reserved. N C R S T
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RSPA/FDOT 2004-12-02 #16 © University of California. All rights reserved. N C R S T
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RSPA/FDOT 2004-12-02 #17 © University of California. All rights reserved. N C R S T
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RSPA/FDOT 2004-12-02 #18 © University of California. All rights reserved. N C R S T
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RSPA/FDOT 2004-12-02 #19 © University of California. All rights reserved. N C R S T
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RSPA/FDOT 2004-12-02 #20 © University of California. All rights reserved. N C R S T
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RSPA/FDOT 2004-12-02 #21 © University of California. All rights reserved. N C R S T
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RSPA/FDOT 2004-12-02 #22 © University of California. All rights reserved. N C R S T
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RSPA/FDOT 2004-12-02 #23 © University of California. All rights reserved. N C R S T
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RSPA/FDOT 2004-12-02 #24 © University of California. All rights reserved. N C R S T
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RSPA/FDOT 2004-12-02 #25 © University of California. All rights reserved. N C R S T
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RSPA/FDOT 2004-12-02 #26 © University of California. All rights reserved. N C R S T
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RSPA/FDOT 2004-12-02 #27 © University of California. All rights reserved. N C R S T
Name Discrepancies
A B C D EE CAMINO CIELO RDCAMINO CIELO no record E CM CIELOSAN MARCOS PASSHIGHWAY 154 SAN MARCOS PASSSAN MARCOS PASSHWY 154 CA-154 blankMOUNTAIN DR MOUNTAIN MOUNTAIN W MOUNTAIN DRE MOUNTAIN DR PARK E MOUNTAIN DR
BELLA VISTA PARK LNBELLA VISTA DR
FOOTHILL RD CATHEDRAL OAKSHWY 192 CATHEDRAL OAKSCATHEDRAL OAKS RDCATHEDRAL OAKS RD FOOTHILL FOOTHILL RD
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RSPA/FDOT 2004-12-02 #28 © University of California. All rights reserved. N C R S T
Solutions—Geometry
Remote sensing GPS
• high-end dedicated• multiple vehicles?
Photogrammetry Mosaic engineering drawings
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R E M O T E
S E N S I N G
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RSPA/FDOT 2004-12-02 #31 © University of California. All rights reserved. N C R S T
Hyperspectral process 1
MESMA(Dar)
Q-tree Vectorize
Additional steps: clean, conflate
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RSPA/FDOT 2004-12-02 #32 © University of California. All rights reserved. N C R S T
MESMA(Dar)
Thinning,Filters
Comparison
Additional steps: clean, conflate
Hyperspectral process 2
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T H E G P S
C H A L L E N G E
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RSPA/FDOT 2004-12-02 #34 © University of California. All rights reserved. N C R S T
High end (“SOP”) GPS
ARAN Output: GPS
every 10 m — not topological centerlines
Cost: x 104
(service)Roadware Inc
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RSPA/FDOT 2004-12-02 #35 © University of California. All rights reserved. N C R S T
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RSPA/FDOT 2004-12-02 #36 © University of California. All rights reserved. N C R S T
ARAN output
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RSPA/FDOT 2004-12-02 #37 © University of California. All rights reserved. N C R S T
Problems w/ Dedicated GPS
Need to get it right the first time Verification? IMU helps ($$$)
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RSPA/FDOT 2004-12-02 #38 © University of California. All rights reserved. N C R S T
The Consumer-GPS Challenge
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RSPA/FDOT 2004-12-02 #39 © University of California. All rights reserved. N C R S T
GPS Results — lane resolution
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RSPA/FDOT 2004-12-02 #40 © University of California. All rights reserved. N C R S T
The one to beat …
$150 at Staples
Convenience Price
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T H E G R E A T
G P S - L I N E A R
COMPATIBILITY
C H A L L E N G E
?
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RSPA/FDOT 2004-12-02 #42 © University of California. All rights reserved. N C R S T
LX for professionals
DMI: accurate to 1 m
Linear referencing: “US101 — 20.25”
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RSPA/FDOT 2004-12-02 #43 © University of California. All rights reserved. N C R S T
A 7075C 7472E 7330DMI 7477GPS 7446
6400
6600
6800
7000
7200
7400
7600
A B C E DMI GPS
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RSPA/FDOT 2004-12-02 #44 © University of California. All rights reserved. N C R S T
A Myth about Linear vs 2D
Distance over the hill is greater: need to correct for elevation
Difference = 0.25% (on a 7% grade)
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RSPA/FDOT 2004-12-02 #45 © University of California. All rights reserved. N C R S T
What Really Happens on the Hill
Inaccurate (x,y) geometry shortchanges length up to 20%
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RSPA/FDOT 2004-12-02 #46 © University of California. All rights reserved. N C R S T
Linear Accuracy Tests — Setting
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RSPA/FDOT 2004-12-02 #47 © University of California. All rights reserved. N C R S T
Linear Accuracy Tests — Setting
~10 km road, rises 800m, average 8% grade
Numerous hairpins Some dense tree canopy
and partial GPS occlusion Remote sensing would
have difficulty with this
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RSPA/FDOT 2004-12-02 #48 © University of California. All rights reserved. N C R S T
Linear Accuracy Test — Results
$150-GPS length close to DMI• uphill: 1 ~ 1.5%• downhill: 0.5%
Uphill/downhill difference• Simulated: opposing lane geometry: 0.02-0.05%• GPS: 0.2% (higher downhill speed?)• DMI: 1.5% (affected by engine rev?)
Conclusion (provisional, more study needed)• GPS just as accurate (±0.5%), more consistent
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RSPA/FDOT 2004-12-02 #49 © University of California. All rights reserved. N C R S T
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RSPA/FDOT 2004-12-02 #50 © University of California. All rights reserved. N C R S T
Will GPS replace LR?
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RSPA/FDOT 2004-12-02 #51 © University of California. All rights reserved. N C R S T
Big Picture
Applications Scale Convert Remote GPS Photo- Enggpaper sensing grammetry plans
Mkt research 1:50K • • • • •EMS 1:20K • • • • •Hwy ops 1:20K • • • • •Lane tolls 1:5K • • •Plowing 1:1K • • •ITS 2010 1:100 • •
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RSPA/FDOT 2004-12-02 #52 © University of California. All rights reserved. N C R S T
Manual Softcopy
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RSPA/FDOT 2004-12-02 #53 © University of California. All rights reserved. N C R S T
UNETRANS
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RSPA/FDOT 2004-12-02 #55 © University of California. All rights reserved. N C R S T
The Future
ITS• lane departure warning• autonomous control and platooning
Sub-decimeter accuracy Millions of sensors
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RSPA/FDOT 2004-12-02 #56 © University of California. All rights reserved. N C R S T
Tomorrow’s Centerlines
Car navigation system automatically updates local map while you gas up
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RSPA/FDOT 2004-12-02 #57 © University of California. All rights reserved. N C R S T
Conclusions
No single solution to all requirements
Showing promise• Remote sensing• GPS• Photogrammetry
Attribution, conflation, modeling … and data exchange
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1www.ncgia.org