D9_Post_Mile_Layer (FeatureServer)

View In: Map Viewer

Service Description: A comprehensive feature layer showing the locations of highway post miles in Caltrans District 9 at intervals of 10 miles, 1 mile, 1/10th of a mile and 1/100th of a mile.

Service ItemId: 19a9c23362cd4e269201d0a527d6a35a

Has Versioned Data: false

Max Record Count: 10000

Supported query Formats: JSON

Supports applyEdits with GlobalIds: True

Supports Shared Templates: True

Source Schema Changes Allowed: true

Has Views: true

Has Sync Enabled Views: false

Views

All Layers and Tables

Layers:

Description:

This feature layer is used to display post mile locations in Caltrans District 9 on a digital map display, or to query for the purposes of finding a specific location reference by county, route, and post mile value. Prefixes and suffixes for post miles are included where applicable. The source of data is the Caltrans TSN (Transportation System Network) database.

As presented here, post miles are valid point geometries shown at four different mile intervals, based on the Caltrans Linear Referencing System:

Deca Post Miles (10-Mile Interval)
Whole Post Miles (1-Mile Interval)
Tenth Post Miles (0.1 or 1/10th Mile Interval)
Hundredth Post Miles (0.01 or 1/100th Mile Interval)

Exceptions that are included are the beginning and ends of routes (and other situations) that don't necessarily correspond to expected values in the above-mentioned mile intervals. The geometry is based upon the extraction from TSN on 8 June 2025, with additional edits mades to District 9 routes in December 2025.

Copyright Text: Caltrans District 9 GIS Unit

Spatial Reference: 102100 (3857)

Initial Extent:

Full Extent:

Units: esriMeters

Child Resources: Replicas Info SharedTemplates

Supported Operations: Query ConvertFormat Get Estimates Create Replica Synchronize Replica Unregister Replica