20220311
15282800
1.0
FALSE
002
CalTrans_Postmiles_10th
-13833100.873400
-12723629.494500
3834998.605900
5161799.897500
1
Projected
GCS_WGS_1984
Linear Unit: Meter (1.000000)
WGS_1984_Web_Mercator_Auxiliary_Sphere
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150000000
5000
ISO19139
20220302
16434900
20220302
16444200
dataset
LRS Feedback
Department of Transportation
LRS
LRS Feedback@dot.co.gov
LRS Feedback
20220302
ArcGIS Metadata
1.0
LRS Feedback
Department of Transportation
LRS
LRS Feedback@dot.co.gov
LRS Feedback
Feature Class
vector digital data
CalTrans_Postmiles_10th
LRS Feedback
Department of Transportation
LRS
LRS Feedback@dot.co.gov
2021-10-01T00:00:00
20211001
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Postmiles are valid postmile points at 0.1 (1/10th) mile intervals, based on the Caltrans Linear Referencing System developed from the Caltrans TSN extraction on 1 October 2021. 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 digital 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 larger intervals, postmiles are included that fall on a smaller 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. 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 Postmiles 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 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.
DEA Version: The DEA version of this layer is exactly the same except there is labels for the PMc field and there is an elevation field based on USGS DEM 100 feet Raster imagery. Also this version does not show LEFT alignment as its purpose is to clearly show labels and be used as a reference.
Transportation, Postmiles
Transportation
Please do not redistribute this dataset. Refer requestors back to Caltrans.
Version 6.2 (Build 9200) ; Esri ArcGIS 10.8.1.14362
1
-124.264859
-114.298308
42.005477
32.544498
LRS Feedback
Department of Transportation
LRS
California Department of Transportation (Caltrans)
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>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. </SPAN></P></DIV></DIV></DIV>
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.
Data are sourced from the Transportation System Network (TSN) database, restructured into the Caltrans Reference Section table, restructured into an Event table which is then Dynamically Segmented onto the Caltrans Postmile Network in the Roads and Highways Linear Referencing System.
157892
EPSG
8.8(9.3.1.2)
CalTrans_Postmiles_10th
Feature Class
157892
File Geodatabase Feature Class
Esri
Shape
Shape
Geometry
4
0
0
Feature geometry.
ESRI
Coordinates defining the features.
OBJECTID
OBJECTID
OID
4
10
0
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
Route
Route
SmallInteger
2
State Highway Route number.
5
0
Caltrans
County
County
String
3
County (standard 3-character abbreviation).
0
0
Caltrans
RouteS
RouteS
String
4
0
0
Combination of Route and Route Suffix.
Caltrans
PMRouteID
PMRouteID
String
10
0
0
The unique Postmile Route identifier. For the Postmile Network this is comprised of County (characters 1-3), Route (characters 4-6), Route Suffix (character 7) Postmile Prefix (character 8), Postmile Suffix (character 9) and Alignment (character 10). A period (".") is used as a placeholder for the third character of a two-character county or missing Route Suffix, Postmile Prefix or Postmile Suffix.
Caltrans
RteSuffix
RteSuffix
String
1
Route suffix.
0
0
U
Unrelinquished route.
Caltrans
S
Supplemental route.
Caltrans
Caltrans
DIST
District
SmallInteger
2
5
0
PM
PM
Double
8
38
8
Postmile
Caltrans
PmPrefix
PMPrefix
String
1
C
Commercial lanes
Caltrans
D
Duplicate postmile at meandering county line
Caltrans
G
Reposting of duplicate postmile at end of a route
Caltrans
H
Realignment of D mileage
Caltrans
L
Overlapping postmile
Caltrans
M
Realignment of R mileage
Caltrans
N
Realignment of N mileage
Caltrans
R
First realignment
Caltrans
S
Spur
Caltrans
T
Temporary connection
Caltrans
Postmile prefix.
0
0
Caltrans
PMc
PMc
String
9
0
0
Combined postmile. Combined from PmPrefix, PM, PmSuffix.
Caltrans
Odometer
Odometer
Double
8
38
8
Actual distance in miles (calculated from the running summation of postmiles) from the beginning of the route to this postmile.
Caltrans
PMInterval
PMInterval
Double
8
38
8
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.
Caltrans
0.01
Postmile represents 1/100th of a mile.
Caltrans
0.1
Postmile represents 1/10th of a mile.
Caltrans
1
Postmile represents 1 mile.
Caltrans
5
Postmile represents 5 miles.
Caltrans
10
Postmile represents 10 miles.
Caltrans
Caltrans
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).
Caltrans
Begin Segment
Beginning of a segment (where postmiling changes for some reason, e.g. an equation point).
Caltrans
Mid Segment
Postmile lands along the segment; not at segment end point.
Caltrans
End Segment
Postmile lands on the end of a segment (where postmiling changes for some reason, e.g. an equation point).
Caltrans
End County
Postmile lands on the ending of a county (or route).
Caltrans
Caltrans
PmSuffix
PMSuffix
String
1
Postmile suffix.
0
0
L
Left alignment
Caltrans
R
Right alignment
Caltrans
Caltrans
AlignCode
AlignCode
String
20
Right
Falls on a right alignment (may be identical to left alignment)
Caltrans
Left
Falls on a left alignment (may be identical to a right alignment).
Caltrans
Right Split Align
Falls on a right independent alignment.
Caltrans
Left Split Align
Falls on a left independent alignment.
Caltrans
Alignment code
0
0
Caltrans
RouteType
RouteType
String
10
State
State highway
Caltrans
US
US Highway
Caltrans
Interstate
Interstate Highway
Caltrans
Route Type - State, US, Interstate
0
0
Caltrans
Direction
Direction
String
2
0
0
General traveled direction (NB, EB, SB, WB) of entire route. Individual locations may vary.
Caltrans
NB
Northbound
Caltrans
EB
Eastbound
Caltrans
SB
Southbound
Caltrans
WB
Westbound
Caltrans
PMoffset
PMoffset
Double
8
38
8
Used for Dynamic Segmentation. Is the same value as PM except for the second point of every equation point (Begin County, Begin Segment). This causes the second point to be offset downstream by 0.001 miles. For cartographic purposes, this prevents two postmile points from being exactly coincident.
Caltrans
Lat
Lat
Double
8
38
8
Long
Long
Double
8
38
8
Elevation
Elevation
Double
8
38
8
Simple
FALSE
157892
TRUE
FALSE