20250709
08540100
1.0
FALSE
Postmiles
-124.264846
-114.298297
32.544311
42.005472
1
002
Geographic
GCS_North_American_1983
Angular Unit: Degree (0.017453)
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20200914
09470000
20200914
9515300
150000000
5000
ISO19139
ISO 19139 Metadata Implementation Specification
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
File Geodatabase Feature Class
vector digital data
Postmiles
2020-08-21T00:00:00
LRS Feedback
Department of Transportation
LRS
LRS Feedback@dot.co.gov
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Postmiles are valid postmile points at 1 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 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. 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.
Transportation
Transportation
Please do not redistribute this dataset. Refer requestors back to Caltrans.
Esri ArcGIS 10.7.1.11595
1
-124.264846
-114.298297
42.005472
32.544311
LRS Feedback
Department of Transportation
LRS
LRS Feedback@dot.ca.gov
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.
Postmiles
Feature Class
39982
Shape
Shape
Geometry
0
0
0
Feature geometry.
ESRI
Coordinates defining the features.
OBJECTID
OBJECTID
OID
4
0
0
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
Route
Route
SmallInteger
2
State Highway Route number.
0
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
RouteS
RouteS
String
4
0
0
County
County
String
3
County (standard 3-character abbreviation).
0
0
District
District
SmallInteger
2
Caltrans district (1-12).
0
0
RteSuffix
RteSuffix
String
1
Route suffix.
0
0
U
Unrelinquished route.
S
Supplemental route.
Z
PM
PM
Single
4
0
0
Postmile
PmPrefix
PMPrefix
String
1
C
Commercial lanes
D
Duplicate postmile at meandering county line
G
Reposting of duplicate postmile at end of a route
H
Realignment of D mileage
L
Overlapping postmile
M
Realignment of R mileage
N
Realignment of N mileage
R
First realignment
S
Spur
T
Temporary connection
Postmile prefix.
0
0
PMc
PMc
String
9
0
0
Combined postmile. Combined from PmPrefix, PM, PmSuffix.
Odometer
Odometer
Single
4
0
0
Actual distance in miles (calculated from the running summation of postmiles) from the beginning of the route to this postmile.
PMInterval
PMInterval
Single
4
0
0
Highest postmile interval (0.001 mile, 0.01 mile, 0.1 mile, 1 mile, 5 mile, 10 mile) that this postmile lands on.
0.001
Postmile represents 1/1000th of a mile.
0.01
Postmile represents 1/100th of a mile.
0.1
Postmile represents 1/10th of a mile.
1
Postmile represents 1 mile.
5
Postmile represents 5 miles.
10
Postmile represents 10 miles.
HwySegment
HwySegment
String
15
0
0
Indicates if the postmile lands on the beginning or ending of a highway segment, beginning or ending of a county, or somewhere within a segment.
Begin County
Postmile lands on the beginning of a county (or route).
Begin Segment
Beginning of a segment (where postmiling changes for some reason, e.g. an equation point).
Mid Segment
Postmile lands along the segment; not at segment end point.
End Segment
Postmile lands on the end of a segment (where postmiling changes for some reason, e.g. an equation point).
End County
Postmile lands on the ending of a county (or route).
PmSuffix
PMSuffix
String
1
Postmile suffix.
0
0
L
Left alignment
R
Right alignment
AlignCode
AlignCode
String
20
Right
Falls on a right alignment (may be identical to left alignment)
Left
Falls on a left alignment (may be identical to a right alignment).
Right Split Align
Falls on a right independent alignment.
Left Split Align
Falls on a left independent alignment.
Alignment code
0
0
RouteType
RouteType
String
10
State
State highway
US
US Highway
Interstate
Interstate Highway
Route Type - State, US, Interstate
0
0
dataset
EPSG
6.12(3.0.1)
39982
Simple
FALSE
39982
TRUE
FALSE
20200914