SLKs or Straight Line Kilometers are a location reference system used by Main Roads Western Australia to define the location of features or events along a road. This layer shows SLK points (every 100m) along the left and single carriageways for all State and Local Roads, Main Roads controlled paths contained within the road centreline of Main Roads road asset database. The purpose of this layer is to identify and label the measure of SLK along a particular route and is provided for information only. The SLK points are based on geometric measure and include points of equation. This means that you may notice “jumps” in the SLK between two points that are not equal to 100m. This is as a result of network changes that have been incorporated into the spatial road centr eline.A point of equation is a business term used to describe a point on the road network, which has two SLK references, one for the section leading up to it, and one for the section leaving from it. A Point of Equation is either: • A gap, which occurs when the new deviation/realignment is built shorter than the existing road. An SLK range is missing. • An overlap, which occurs when the new deviation/realignment is built longer than the existing road. An SLK range is duplicatedNote that you are accessing this data pursuant to a Creative Commons (Attribution) Licence, which has a disclaimer of warranties and limitation of liability. You accept that the data provided pursuant to the Licence is subject to changes. Pursuant to section 3 of the Licence you are provided with the following notice to be included when you Share the Licenced Material:- The Commissioner of Main Roads is the creator and owner of the data and Licenced Material, which is accessed pursuant to a Creative Commons (Attribution) Licence, which has a disclaimer of warranties and limitation of liability. Creative Commons CC BY 4.0Data Dictionary

Field Name
Type
Description


ObjectID
OID
System generated unique number, overridden on data update


Shape
Point M
System generated identifier for shape type


RoadCway
Text,255
Concatenation of Main Roads Road Number and Carriageway columns. Used to generate unique routes per road carriageway combination.


SLKMin
Double
The maximum SLK (measure) of the RoadCway


SLKMax
Double
The maximum SLK (measure) of the RoadCway


SLKGen
Double
The SLK measure generated at 100m intervals (0.1, 0.2 etc..)


POINT_X
Double
The Longitude of the SLK point


POINT_Y
Double
The latitude of the SLK point


StreetviewURL
Text.100
A Google Maps Streeview URL link to the SLK point on the road


RoadSLK
Text,50
A concatenation of the RoadCway and SLKGen columns


Road_Name
Text, 80
The Main Roads route name of the road


Common_Usage_Name
Text, 80
The name of the road


RN_SLK
Text, 100
A concatenation of the Road_Name and SLKGen columns


CN_SLK
Text, 100
A concatenation of the Common Usage Name and SLKGen columns

SLKs or Straight Line Kilometers are a location reference system used by Main Roads Western Australia to define the location of features or events along a road. This layer shows SLK points (every 100m) along the left and single carriageways for all State and Local Roads, Main Roads controlled paths contained within the road centreline of Main Roads road asset database. The purpose of this layer is to identify and label the measure of SLK along a particular route and is provided for information only. The SLK points are based on geometric measure and include points of equation. This means that you may notice “jumps” in the SLK between two points that are not equal to 100m. This is as a result of network changes that have been incorporated into the spatial road centr eline.A point of equation is a business term used to describe a point on the road network, which has two SLK references, one for the section leading up to it, and one for the section leaving from it. A Point of Equation is either: •A gap, which occurs when the new deviation/realignment is built shorter than the existing road. An SLK range is missing. •An overlap, which occurs when the new deviation/realignment is built longer than the existing road. An SLK range is duplicatedNote that you are accessing this data pursuant to a Creative Commons (Attribution) Licence, which has a disclaimer of warranties and limitation of liability. You accept that the data provided pursuant to the Licence is subject to changes. Pursuant to section 3 of the Licence you are provided with the following notice to be included when you Share the Licenced Material:- The Commissioner of Main Roads is the creator and owner of the data and Licenced Material, which is accessed pursuant to a Creative Commons (Attribution) Licence, which has a disclaimer of warranties and limitation of liability. Creative Commons CC BY 4.0Data Dictionary

Field Name Type Description

ObjectID OID System generated unique number, overridden on data update

Shape Point M System generated identifier for shape type

RoadCway Text,255 Concatenation of Main Roads Road Number and Carriageway columns. Used to generate unique routes per road carriageway combination.

SLKMin Double The maximum SLK (measure) of the RoadCway

SLKMax Double The maximum SLK (measure) of the RoadCway

SLKGen Double The SLK measure generated at 100m intervals (0.1, 0.2 etc..)

POINT_X Double The Longitude of the SLK point

POINT_Y Double The latitude of the SLK point

StreetviewURL Text.100 A Google Maps Streeview URL link to the SLK point on the road

RoadSLK Text,50 A concatenation of the RoadCway and SLKGen columns

Road_Name Text, 80 The Main Roads route name of the road

Common_Usage_Name Text, 80 The name of the road

RN_SLK Text, 100 A concatenation of the Road_Name and SLKGen columns

CN_SLK Text, 100 A concatenation of the Common Usage Name and SLKGen columns