Using Network Analyst with Tiger Road Data

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Using Network Analyst with Tiger Road Data

• John Q. Murray
• Murray Information Services, Inc.

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Three sources for road data

• Tiger US Census data at the NRIS site
• nris.state.mt.us/tiger tgrXXYYYlka.shp XX
  state, YYY County, example Montana 30,
  Mineral 061
• Suggested legend file (.avl)
• US Forest Service data
• Liz Gupton, Superior (d7) and Ninemile (d4)
  districts
• State DOT project (starting now, June 2002)
• Missoula County surveyor office will supervise
  work in Missoula, Mineral, Ravalli counties
• Hiring former Road Dept employee as driver
• Skip Nyberg will give us the MDT database

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Tiger data at the NRIS site

• nris.state.mt.us/ nsdi/ tiger2000
• For ease of use, download in Montana State
  Plane format
• Download by county

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Census geography a quick lesson

• County
• Division
• Place
• Tract
• Block group
• Block

Already oriented to location useful for many
types of other data
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FIPS code

• Census codes often used as geocodes in GIS
• Federal Information Processing Standard (FIPS)
• State code for Montana - 2 chars 30
• County code - 3 characters
• 061 Mineral, 063 Missoula
• Place code - 5 chars
• Class code - 2 chars
• Identifies place type

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TIGER line data

• Street and road data for entire U.S.
• Topologically Integrated Geographic Encoding and
  Referencing System
• http//www.census.gov/geo/www/tiger/tiger2k/tgr200
  0.html
• Missoula County tgr30063.zip
• Mineral County tgr30061.zip

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Get Tiger data for Mineral Co.

• See list.htm, pictured here
• Mineral County zip file tgr30061.zip
• Roads line file tgr30061lkA.shp
• Census blocks file tgr30061blk00.shp

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Add the Tiger road theme

• From the View menu, select Add Theme
• tgr30061lka.shp, then click OK

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Use the recommended legend

• From the theme menu, select Edit legend
• From the Legend Editor dialog, select the
  Load button
• Use the AVL file that comes with the Tiger data,
  OK
• In the Load Legend dialog, select the field
  Cfcc, then click OK

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Appropriate road symbols

• Cfcc field in the roads theme indicates the
  road type
• The provided legend uses standard symbols for
  each road type
• For example, I-90 is an interstate highway

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Mineral Co. roads with legend
I-90 near the city of Superior Fename is the
road name
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Use Network Analyst

• From the File menu, select the Extensions command
• In the Extensions dialog, checkNetwork
  Analyst

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Network Analyst menus

• Adds its own menu
• Find Best Route between points
• Add theme Nettest1.shp with two points for a
  test

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Find Best Route

• Network Analyst creates a new theme named
  Routen where n is a number
• In this example, Route4

• Click the Load Stops button
• Select the test theme with the two stops

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Load Stops

• Select the point theme, then OK
• The Route4 dialog displays all the stops (here
  there are only two)

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Route properties

• Select the cost field line length
• The units in this dialog are set by the View
  properties

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Find the best route

• Click on the Find best route button
• The Route theme is updated to show the best route

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Directions

• In the Route dialog, click Directions
• In the Directions dialog, click the Properties
  button to add street names
• Select the street name field Fename and click
  Add
• Click OK

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Directions (continued)

• Detailed directions include distances, directions
  of turns, total distance
• Click Done

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Future work

• State of Montana is moving toward the UNETRANS
  (Unified Network for Transportation consortium)
  data model
• ESRI support
• Four elements
• Model specified in Unified Model Language (UML)
• Poster showing the logical model
• Data
• Documentation

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Other sources of road data

• (National Transportation Atlas Database) from the
  BTS