Service Description: StateHighways is used to display state highways on a digital map display. Each record represents a segment of California state highway where the county, route, postmile prefix, and postmile suffix are unchanging, and there are no gaps or overlaps in the postmiles.
Each segment is coded with the district, county, route, postmile prefix (if any), begin postmile, end postmile, and postmile suffix (if any). One additional field - AlignCode - should be understood by the user for effective use of this data set (refer to the Entity and Attribute Information section of this metadata).
AlignCode indicates if the state highway segment is on a Right alignment, Left alignment, Right side of an independent alignment or Left side of an independent alignment. Where TSN (Transportation System Network - the source database) considers most state highways to have just a centerline, the underlying LRS (Linear Referencing System) linework that these segments are based upon has a line for each direction.
On undivided highways the right and left lines are identical. On divided highways the right and left are separated, but TSN treats the segment as a single centerline. In the last case where highways are not only divided but also have different lengths (where the right and left carriageway diverge around physical obstacles or are separated onto different one-way streets) the underlying linework has dual carriageways, and TSN treats the segment as an "independent alignment". In some cases (especially for small-scale mapping), it may be appropriate to display linework for just one alignment (e.g. Right alignment), and only for the other side where TSN indicates independent right and left alignments. In other cases (e.g. large-scale mapping), it may be appropriate to display postmiles for both alignments, regardless of how TSN treats the segment.
This is an example of a query string that displays linework only for the right alignment where TSN indicates just a centerline, and on both right and left alignments where TSN indicates...
Service ItemId: fd52f501e8594e4ab07faab436cfa175
Has Versioned Data: false
Max Record Count: 2000
Supported query Formats: JSON
Supports applyEdits with GlobalIds: False
Supports Shared Templates: True
All Layers and Tables
Layers:
Description: StateHighways are state highways based upon the Caltrans Linear Referencing System. Each record in this layer represents a highway segment where the county, route, postmile prefix, and postmile suffix are the same. Each segment has a begin and end postmile. This geometry is based upon the extraction from TSN on 10 October 2022.
Caltrans District 9 GIS Unit
Spatial Reference: 4269 (4269)
Initial Extent:
XMin: -118.331377554863
YMin: 36.1014140359311
XMax: -117.730193277726
YMax: 36.5071500832944
Spatial Reference: 4269 (4269)
Full Extent:
XMin: -119.637178064
YMin: 34.8204839590001
XMax: -116.073193652
YMax: 38.6877372020001
Spatial Reference: 4269 (4269)
Units: esriDecimalDegrees
Child Resources:
Info
SharedTemplates
Supported Operations:
Query
ConvertFormat
Get Estimates