Snow Route Prioritizing

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Snow Route Prioritizing

• John Schroeter
• City of Olathe - GIS Technician
• jschroeter_at_olatheks.org

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Outline

• Purpose
• example
• Overview
• Olathe Routes
• Analysis
• Steps
• Conclusion

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The Purpose

• Evaluate and Prioritize snow routes
• The City of Olathe wanted to review and
  prioritize snow routes of streets with slope
  greater than 8.

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The Overview

• Olathe Routes
• Main Routes
• Streets encompassed
• Arterials
• Collectors
• Commercial
• Divided into 20 zones
• Use lane miles
• Street department main responsibility

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The Overview

• Olathe Routes
• Cul-De-Sac Routes
• Streets encompassed
• All Residential and cul-de-sac streets
• Divided into 19 zones
• Around 64 cul-de-sacs per zone
• Other departments and divisions send drivers

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The Analysis

• The Questions?
• What streets have a slope greater than 8?
• Why are we asking this question?
• Why did we chose 8?

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The Analysis

• The DEM
• Using the Topogrid function in ArcInfo
  Workstation, a digital elevation model (DEM) was
  created from 2-foot contours. The pixel size for
  this DEM was 10 by 10-foot covering an area of 55
  sq miles. The "GRIDALLOCSIZE" environment
  variable was added in the system properties to
  allocate enough virtual memory for the grid
  creation. This process took several hours to
  create after all the specifications were set for
  the grid. (Figure 1)

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The Analysis

• The Dialog to a DEM
• Using 2 foot contour intervals
• Arc w c\Workspace\workspace
• Arc topogrid
• Usage TOPOGRID ltout_gridgtltcell_sizegt
• Arc topogrid out_dem 10
• TopoGrid datatype contour
• TopoGrid contour contour ELEV
• TopoGrid tolerances 1 1 0
• TopoGrid outputs sink1 drain1 diag1
• TopoGrid end
• Arc

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The Analysis

• Whats New?
• Topo To Raster is the ArcGIS 9.x implementation
  of TopoGrid from ArcInfo Workstation 7.x
• Comparisons to TopoGrid 7.x
• The GRIDALLOCSIZE environment variable is no
  longer used.
• The internal program limits, for the most part,
  have been relaxed, allowing larger and denser
  input datasets to be used.

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The Analysis
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The Analysis

• The Slope Grid
• A percent of slope was derived from the DEM using
  the spatial analyst tools. (Figure 2)
• Then using the raster calculator, the slope grid
  was reclassified to show only greater than 8.
• Olathes street centerline was then converted to
  a raster format and the cells falling in the
  eight percent or greater range were given a value
  of 1 using the raster calculator.
• The streets with slopes greater than eight
  percent were then highlighted in the residential
  snow route maps. (Figure 3)

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The Analysis
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The Analysis
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The Analysis
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The Results
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The Conclusion

• The results helped to improve the overall
  residential routes, by serving those off of more
  critical sections of streets with slope greater
  than 8.
• It also improved communication between divisions
  because the request first originated with the
  Streets Division.

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• John Schroeter
• City of Olathe - GIS Technician
• jschroeter_at_olatheks.org