United States Department of Transportation
i
Sidewalk data in King County's urban growth boundary.
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2013-06-01
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[PDF-2.31 MB]
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NTL Classification:NTL-PEDESTRIAN AND BICYCLES-Pedestrians;NTL-PLANNING AND POLICY-PLANNING AND POLICY;
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Abstract:This report describes the development of geospatial sidewalk data for the King County Urban
Growth Area. Prior to the development of this data set, sidewalk data in King County were limited to
select jurisdictions and existed in multiple, sometimes incompatible, formats.
Existing sidewalk data were collected from 30 of 40 jurisdictions and standardized to a geographic
information system (GIS) data format that stores sidewalk coverage as attributes of King County street
network centerlines. For each street segment, each sides was coded as full, no, or partial sidewalk
coverage. An automated coding method was developed to standardize existing data when possible.
Sidewalk coverage for jurisdictions with no existing sidewalk data or with data formats incompatible
with automated coding were coded manually with the aid of internet mapping resources. A total of 27
jurisdictions, including unincorporated King County, were manually coded.
Overall rates of agreement between automated and manual coding were 0.95, with higher rates of
agreement for street segments with full and no (0.94 to 0.97) compared to partial sidewalk coverage
(0.70 to 0.72).
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