OVERVIEW

The roadway linework is now used as the geometry for the Executive Office of Transportation-OTP Roads layer and the railroads in the Trains layer; those layers also have extensive attributes not included in this Centerlines layer. The linework in this layer - representing roadways and railroads - was produced as part of the 1:5,000 Black and White Digital Orthophoto images project. The linework was interpreted by staff at Intermap Technologies, Inc., (MassGIS' contractor for the black and white orthophoto project) using the original half-meter photography viewed in three dimensions. Both roadways and railroads were delineated, and efforts were made by the interpreters to distinguish among public streets, access roads, railroads in use, abandoned railways, and underpasses of each. Originally delivered to MassGIS as ArcInfo Generate files tiled via the Orthophoto Quad Index, the 1:5,000 Road Centerlines were appended and clipped by town. In ArcSDE the single layer is named ROADS5K_ARC.

Each ROADS5K_ARC attribute table contains the numeric item CODE, with the following values:

1004 - Surface street
1024 - Underpass
1035 - Access road
1039 - Access road underpass
1400 - Railroad
1401 - Abandoned railroad
1405 - Railroad underpass
1408 - Abandoned railroad underpass

For more detailed roads attributes, such as street name, route number, and functional classification, please see the Executive Office of Transportation-OTP Roads layer. For detailed rail attributes, such as line ownership and MBTA Commuter Rail designations, see the Trains layer.

This datalayer is maintained by MassGIS.

Last Updated 10/2/2002
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