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Litter_2025
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Geographic
GCS_North_American_1983
Angular Unit: Degree (0.017453)
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20260106
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ItemDescription
Andy Richardson
California Department of Transportation District 5
(805) 549-3571
Andy.Richardson@dot.ca.gov
District GIS Coordinator
ArcGIS Metadata
1.0
Andy Richardson
California Department of Transportation District 5
District GIS Coordinator
(805) 549-3571
Andy.Richardson@dot.ca.gov
Shapefile
0.000
California Department of Transportation District 5
Andy Richardson
District 5 GIS Coordinator
Andy.Richardson@dot.ca.gov
(805) 549-3571
vector digital data
Litter_2025
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Postmiles are valid postmile points at 0.1 (1/10th) mile intervals, based on Office of GIS Linear Referencing System layer (TIGER linework). Exceptions that are included are the beginning and ends of routes (and other situations) that don't necessarily begin or end on the even 0.1 mile interval.</SPAN></P><P><SPAN /></P></DIV></DIV></DIV>
Postmiles is used to display postmile locations on a map display, or to query for the purposes of finding a specific location reference by county, route, and postmile. Postmiles are coded with the district, county, route, postmile prefix (if any), postmile, and postmile suffix (if any). The source of data is the Caltrans TSN (Transportation System Network) database as it appeared on February 26, 2018. Two additional fields - PMInterval and 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). PMInterval indicates the interval on which the postmile falls: 0.001, 0.01, 0.1, 1, 5, or 10. This field is handy for drawing a subset of postmiles at desired intervals, for example this Definition Query will tell ArcMap to draw postmiles only at 1 mile intervals: "PMInterval" >= 1 Though the vast majority of postmiles fall on a 0.1 (tenth mile) or higher intervals, postmiles are included that fall on a lesser interval. Examples are the beginning or end of a route or county, or at an equation point. These postmiles can be identified through use of the "HwySegment" field that contains codes of "Begin County", "Begin Segment", "Mid Segment", "End Segment", and "End County". Begins and ends of routes are coded "Begin County" and "End County". A Definition Query that would tell ArcMap to draw postmiles only at 1 mile intervals or the begin of county would be: "PMInterval" >= 1 OR "HwySegment" = 'Begin County'
AlignCode indicates if the postmile is on a Right alignment, Left alignment, Right Side of an independent alignment, or Left Side of an independent alignment. Where TSN considers most state highways to have just a centerline, the underlying linework that the postmiles are based upon has a line for each direction. In some cases the right and left lines are identical (where there is no median). In other cases the right and left are separated (where there is a median, or dual carriageways), but TSN treats the segment as a single centerline. In the last case the underlying linework has dual carriageways, and TSN treats the segment as a split alignment (where there are independent right and left alignments). In some cases (especially for small-scale mapping), it may be appropriate to display postmiles for just one alignment (e.g. Right alignment), and only for the other side where TSN indicates independent 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 Definition Query that would tell ArcMap to display postmiles at one mile intervals only on the right alignment where TSN indicates just a centerline, and on both right and left alignments where TSN indicates independent alignments: "PMInterval" >= 1 AND "AlignCode" <> 'Left' Similarly, only at 1 mile intervals or beginning of county, and not Left: ("PMInterval" >= 1 OR "HwySegment" = 'Begin County') AND "AlignCode" <> 'Left'
The Odometer field represent the actual distance in miles from the start of the highway to the postmile. This is in contrast to the postmile value, which no longer represents this value as each highway is realigned (and made longer or shorter) over time.
Andy Richardson
California Department of Transportation District 5
District 5 GIS Coordinator
(805) 549-3571
Andy.Richardson@dot.ca.gov
Transportation
Transportation
Please do not redistribute this dataset. Refer requestors back to Caltrans, District 5.
Esri ArcGIS 13.1.0.41833
1
-124.264846
-114.298297
42.005472
32.544311
Attribute accuracy is high, but not 100%. Errors are based on currentness of source database (TSN), or may result as dataset ages.
Horizontal accuracy is only as good as the TIGER layer, generally within 5 meters.
Litter_2025
Feature Class
0
FID
FID
OID
4
0
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Shape
Geometry
0
0
0
Feature geometry.
ESRI
Coordinates defining the features.
Route
Route
Integer
5
State Highway Route number.
5
0
RouteID
RouteID
String
16
Unique identifier of underlying Linear Referencing layer. RouteID along with Measure fields can allow these points to be re-dynamically segment points.
0
0
County
County
String
3
County (standard 3-character abbreviation).
0
0
District
District
Integer
5
Caltrans district (1-12).
5
0
PM
PM
Single
13
0
0
Postmile
CUYD
CUYD
Double
19
0
0
dataset
EPSG
6.5(3.0.1)
0
Simple
FALSE
0
FALSE
FALSE
20260106