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All Roads LRS Overview and Status
Keith Chervunkong Caltrans GIS LRS Branch
January 23 , 2020
Caltrans Linear Referencing System
Purpose:
Provide overview of the Caltrans All Roads LRS and the status of updates.
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Di stance along Ii ne
What is a Linear Referencing System(LRS)? Linear referencing is themethod of storing geographic locations by using relativepositions along a measuredlinear feature. Distance measures are used to
ArcGIS Resources, locate events along the line. http://resources.arcgis.com/en/help/main/10.2/index.html#/What_is_linear_refe rencing/003900000001000000/
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R,out,e PM_Beg PM_End ■ I I ti
3.rn:m 3,.019 3.019 4.500 4.500 7.298
What is Dynamic Segmentation and Events? The process of creating GIS features from tabular data. Events refer to data that is located by its association to an LRS route and measure location.
Tabular data LRS route with measures – in red
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Dynamic Segmentation - Example
LRS Base Layer – Routes
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Dynam
ic Segmentation -Exam
ple (cont)
Dynseg Events Layer
Tabular data from D
istrict 3 Projects 6
All Roads LRS
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All Roads Network of Linear Referenced Data – (ARNOLD) • July 2012 Federal Highway Administration (FHWA)
new requirement for State DOT’s • All public roads to be linear referencing system (LRS) enabled • Integral to Highway Performance Monitoring System
(HPMS) annual submittal
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Caltrans All Roads LRS Timeline
• All Roads 2016 NAIP (2017) • Cleanup geometry to match 2016 NAIP • High precision counties – 1:2,500/1:1,200
• Alameda, Contra Costa, Imperial, Los Angeles, Marin, Monterey, Napa, Orange, Riverside, San Benito, San Bernardino, San Diego, San Francisco, San Luis Obispo, San Mateo, Santa Barbara, Santa Clara, Santa Cruz, Solano, Sonoma, Tulare, and Ventura.
• Standard precision counties – 1:10,000 • Completed April 2019
• Roads & Highways LRS Statewide Implementation – In progress • Migrate All Roads LRS to ESRI Roads & Highways
• Project completion, Dec. 2020
• All Roads LRS Next Step • Additional high precision counties
• Upgrade standard precision counties to high precision
• Clean additional geometry statewide • Completion 2022
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Roads LRS High Precision Update Project
ALP
TUO
MNO
MPA
MAO
FRE
T\JL KIN
KER
SB
September 30, 2019
High Precision completed
Standard Precision completed
INY
560
RIV
so IMP
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Caltrans LRS Long Term • Transition to ESRI Roads & Highways • Engage and coordinate with Local agencies for updates and
data sharing • Survey Monkey
• Butte, Sacramento, Shasta, Santa Clara, Los Angeles, Mono, Nevada, San Luis Obispo, Solano, and Merced.
• Portal Pilot Project • CalOES
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