ISO-19139 Metadata
Resource Identification Information:
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Citation:
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Title:
LRSN_Postmile
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Presentation format:
mapDigital
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Party responsible for the resource - publisher:
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Organization's name: Caltrans
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Themes or categories of the resource:
transportation
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Place keywords:
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Keywords:
California
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Theme keywords:
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Keywords:
Linear Referencing System, LRS, Roads and Highways, State Highway System, Postmiles, Routes, Measures, Dynamic Segmentation
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Descriptive keywords:
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Keywords:
Live Data and Maps
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Thesaurus name: ArcGIS Content Type
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Abstract:
The LRSN_Postmile feature class is an Esri Roads and Highways Network (or more generically a Linear Referencing Method) that represents the California State Highway System (Interstates, US Highways and State Highways) using the Caltrans Postmile System.The Caltrans Postmile System is fairly complex, where postmiles reset to 0.0 at county boundaries, temporality is managed through Postmile Prefixes and "Independent Alignments" (where right and left sides diverge around various obstacles and are postmiled differently) are managed with Postmile Suffixes. To accommodate this system, entire "Signed Routes" (e.g. 800+ miles of Interstate 5) are divided into a number of "Postmile Routes", where the Postmile Prefix and Postmile Suffix are managed as part of the Route ID, leaving just the numeric portion of the Postmile as the Postmile Route Measure.Additionally, while the Caltrans Postmile System is considered a "Centerline" system (with the exception of the aforementioned independent alignments), the LRSN_Postmile Network stores complete right and left "Carriageways" (the R/L carriageway designation is also part of the Route ID). The reason for this is to best support independent alignments AND to meet Federal Highway Administration requirements for every state's Linear Referencing System.To accommodate division of entire signed routes into multiple Postmile Routes, LRSN_Postmile is configured as a Roads and Highways "Line Feature", where every individual Postmile Route that comprises a Signed Route is tagged with a "Line ID" common to the Signed Route. This supports the ability to perform Dynamic Segmentation of linear events that begin on one Postmile Route and end on another, and the ability to automatically derive the Odometer Network directly from the Postmile Network.The Postmile Network is one of three Roads and Highways Networks maintained in Roads and Highways by Caltrans. The other two are the Odometer Network (also State Highway System only, and derived from the Postmile Network) and the AllRoads Network, which represents all public roads in California (not just state highways).
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Purpose: The primary purposes of LRSN_Postmile is to be the geographic Source System of Record for the California State Highway System, and to support the ability to perform Dynamic Segmentation of tabular data (e.g. geospatially enable) based on Route, County and Postmile.
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Dataset language:
eng
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Dataset character set:
utf8
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Status:
onGoing
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Maintenance:
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Update frequency:
continual
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Resource constraints:
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Constraints:
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Limitations of use: LRSN_Postmiles is made available to the public solely for informational purposes. Information provided is accurate to the best of our knowledge and is subject to change on a regular basis, without notice. While Caltrans makes every effort to provide useful and accurate information, we do not warrant the information to be authoritative, complete, factual, or timely. Information is provided on an "as is" and an "as available" basis. The California Department of Transportation is not liable to any party for any cost or damages, including any direct, indirect, special, incidental, or consequential damages, arising out of or in connection with the access or use of, or the inability to access or use, the Site or any of the Materials or Services described herein.
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Spatial representation type:
vector
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Processing environment: Esri ArcGIS 12.6.1.24783
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Extent:
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Extent description: California
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Geographic element - Bounding rectangle:
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Extent contains the resource: true
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West longitude: -124.350173
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East longitude: -113.674429
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North latitude: 42.068499
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South latitude: 32.444062
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Credits: California Department of Transportation (Caltrans)
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Point of contact - custodian:
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Individual's name: LRS Feedback
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Organization's name: California Department of Transportation (Caltrans)
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Contact information:
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Address:
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e-mail address:
LRS.Feedback@dot.ca.gov
Spatial Representation - Vector:
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Level of topology for this dataset:
geometryOnly
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Geometric objects:
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Object type:
composite
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Object count: 2609
Reference System Information:
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Reference system identifier:
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Value: 3310
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Code space: EPSG
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Version: 6.8(9.2.0)
Data Quality Information:
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Scope of quality information:
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Level of the data:feature
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Lineage:
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Process step:
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Description: Definitive location of the state highway system is based on the Transportation System Network (TSN), e.g. TSN is the State Highway System of Record. Linework was sourced from TIGER line files and measures applied through use of Calibration Points. Linework and calibration are under continual improvement based on updates from TSN and ongoing review using aerial imagery and feedback from users.
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Data quality report - Relative internal positional accuracy:
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Measure description: Linework data are sourced from TIGER and continually corrected to National Agricultural Imagery Program (NAIP) imagery. Estimated horizontal accuracy is on the order of 20 feet or better. "Linear" accuracy, or accuracy of measures is dependent on horizontal accuracy and spacing and location of calibration points, and can be as poor as 250 feet.
Distribution Information:
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Format:
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Format name: Enterprise Geodatabase Feature Class
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Transfer options:
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Metadata Information:
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Metadata language:
eng
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Metadata character set:
utf8
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Last update:
2021-04-19
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Maintenance:
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Update frequency:
asNeeded
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Metadata contact - pointOfContact:
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Individual's name: LRS Feedback
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Organization's name: California Department of Transportation (Caltrans)
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Contact's position: Linear Referencing System Staff
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Contact information:
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Address:
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e-mail address:
LRS.Feedback@dot.ca.gov
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Scope of the data described by the metadata:
dataset
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Scope name: dataset
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Name of the metadata standard used: ISO 19139 Geographic Information - Metadata - Implementation Specification
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Version of the metadata standard: 2007