Network Creation from LRS

Process Diagram

Data

Data Name	Data Location	Purpose
SubBlock Intersections		SubBlock Intersections are point features representing all At-Grade intersections.
SubBlock		SubBlocks are polyline features created between two intersections of any road type. These are our smallest unit of roadways.
Block Intersections		Block Intersections are point features representing all At-Grade street-type intersections (intersections with alleys/driveways/trails/etc. excluded)
Block		Blocks are polyline features created between two street-intersections and are only street type roadways.
Intersection Approaches		Intersection Approaches are polyline features that represent each 'leg' (intersecting route) of an intersection, up to 10 meters in length.
Bike Lanes
Sidewalks
Total Road Width
Speed Limits
Turn Lanes

Network dataset created in file geodatabase (H:\GIS\Data\Network_Dataset)
- Edges - SubBlock feature class
- Junctions - SubBlockIntersection feature class
  - Junction point created at each end of an edge (includes dead ends)
Created "Oneway" attribute in SubBlock to code one-way (digitizing and non-digitizing direction) and two-way streets.
- Use SA to reference section data and create updated oneway attribute?
Perhaps look into custom attributes/evaluators,

Capturing Turn Data: Script created to extract cross-section data, but still needs some work. Script is in Automation/Network Analysis folder: GenerateApproachTurnData
Creates an easy-to-use reference table that allows Osheen's script to get what allowable turns are there.
- Approaching direction only
- Like this:
  IntersectionID ApproachID LeftAllowed RightAllowed ThroughAllowed
  123 ABC 1 1 1
  456 DEF 0 0 1

Capturing roadway attributes: Script (still needs to be written) to extract relevant data for each road edge.
Each network edge must have attributes in order to provide real-world factors for analysis. These factors are listed below and are also in the diagram above:

Comprehensive table where each row represents a potential turn (no restrictions present)
Contains route/subblock/approach/intersection information for both edges of turn, and also displays the turn direction, and turn angle.
Non-At Grade intersections are omitted, since they don't play a factor into turns.

IntersectionID	ApproachID	LeftAllowed	RightAllowed	ThroughAllowed
123	ABC	1	1	1
456	DEF	0	0	1