City of Oakland data set: Freeways with on and off ramps

Who maintains the data for this layer: Joan Curtis, OPB

Data Maintainer Phone: (510) 238-4777

Who converted the data into a GIS format: Kyle Draganov

GIS Technician Phone: unlisted

Size of GIS layer (KB): 432

Size of export file (KB): 681

Where is the layer stored (on the k-drive): k:\gisdata\trans\freeway.e00

This GIS layer was last updated on: 10/1/96

This metadata was last updated on: 3/12/97

This layer's FGDC category description is: Transportation

Data Set Description: This layer delineates the centerlines in each direction of the major interstates only.

Non-standard Attributes in table:

• PREFIX = Prefix to freeway name (e.g. North).
• NAME = Freeway's Name or Number.
• TYPE = Freeway (fwy) or On ramp (on.r) or Off ramp (Off.)
• CFCC = Census feature class
• TRANS = Codes used for the establishment of impedances (e.g. 6 = freeway where traffic flow is opposite arc digitization direction, 7 = freeway where traffic flow matches arc digitization direction.)
• U_ID= Unique identification number

Data Source History: The freeways were hand selected from the main "streets layer", along with on and off ramps. Only the major interstates were included in this layer; smaller road sized highways, such as Rtes. 185 and 61, were left out.

Quality Check: This layer was a sub-set of the street centerline layer, and is as accurate as the streets centerlines. Freeways with 3-dimensional features such as overpasses and tunnels were field-checked from a flashy convertible sportscar by Jonathan Lowe and Kyle Draganov to verify intersections and non-intersections with neighboring streets. The top was down.

Security restrictions: No security restrictions.

Update Frequency: No scheduled updates--changes to the damaged Cypress freeway are not captured.

Update process: The new Cypress Structure will be updated when accurate coordinates are available.

Last update: 26 September, 2007.     Copyright © 2007 Jonathan W. Lowe.     All Rights Reserved.