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Lower Adirondack GIS Users Group Meeting. Warren County Street Centerline Project December 1, 2004. Background. Warren County : ~ 1200 miles of public roads ~ 600 miles of private roads County completed in-house : ~ 450 miles geometry ~ 200 miles attribution Error checking of 1 town

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lower adirondack gis users group meeting
Lower Adirondack GIS Users Group Meeting

Warren County Street Centerline Project

December 1, 2004

background
Background

Warren County :

~ 1200 miles of public roads

~ 600 miles of private roads

County completed in-house :

~ 450 miles geometry

~ 200 miles attribution

Error checking of 1 town

Summer 2004 – the Sheriff’s Department hired a consultant, (Applied GIS, Inc.) to complete the project

existing road data
Existing Road Data
  • NYS DOT roads
  • TIGER roads
  • NYS Accident Location Information System (ALIS)

These data sources have inaccuracies in geometry and attribution (especially consistency with E-911 address ranges)

data sources for geometry development
Data Sources for Geometry Development
  • 2001 Digital Orthoimagery
  • Tax Parcel layer with RPS
  • Road Centerlines from ALIS
  • GPS field work
geometry methodology
Geometry Methodology
  • Divided Roads: Line segments head’s up digitized following the road’s centerline (where visible)
  • Undivided and Dirt Roads: Line segments within the edge of the roadbed
slide8

Geometry Methodology

  • Complex Features:
    • Cul-de-sacs
    • Multiple lane highways
    • Divided highways
      • Follow ALIS Project Rules
slide9

Attribution Methodology

  • Based on Warren County’s Dispatch System
  • Primarily manual coding, referencing Sheriff Department Excel spreadsheets
  • 14 fields manually entered
  • Additional fields obtained from Sheriff Department Excel
slide10

Attribution Methodology

  • Manual Attributes Coded:
slide11

Attribution Methodology

  • Address ranges interpolated from Excel data fields
  • Cross reference with other sources:
    • Spreadsheets listing residents’ names and house numbers (available for ~ half the towns)
    • Real Property data (BUT! not consistently accurate for E-911 addresses)
slide12

Error Checking

  • Type 1: Compare Sheriff Excel spreadsheet address ranges to other available sources
    • Error report of unresolved cases provided to Sheriff’s Department
    • Sheriff’s Department field checked, corrected data sent back to Applied GIS for update
slide13

Error Checking

  • Type 2: Geocode in ArcGIS the County’s Voter Registration database for each town.
    • Errors identified as either:
      • Mistake in address ranges of data (correction by consultant)
      • Error in voter registration database
slide14

Problem

  • County’s address ranges were developed independent of GIS, therefore address ranges may not be consistent with road length