CEGR697: Geographic Information Systems Application in Transportation Chapter 3: Data Acquisition and processing

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CEGR697 Geographic Information Systems
Application in TransportationChapter 3 Data
Acquisition and processing

• Instructor Min-Wook Kang
• min-wook.kang_at_morgan.edu
• 443-885-1442
• www.eng.morgan.edu\cegr697

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Outline

• Chapter 2 Objective
• Understand/Get familiar with some useful spatial
  data popularly used for GIS-T
• List of Useful Spatial Data
• MdProperty Data
• Census Tracks / Census Block Groups / Census
  Blocks
• TAZ by local MPO (Metropolitan Planning
  Organization)
• TIGER file

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MdProperty Data

• What data we can get?
• Tax Maps, Parcel data, Appraisal data,
• Aerial imagery, ZIP code boundary files,
• Land use/land cover data,
• Census geography and census demographic data,
• Priority Funding Area (PFA) designations,
• Legislative and congressional district boundary
  files,
• Flood plain data,
• Generalized zoning designations,
• Protected land boundaries,
• Sewer service area boundaries
• Where to get?
• Maryland Department of Planning

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MdProperty Data
For Montgomery County my_ex03.mxd
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MdProperty Data
For Allegany County my_ex04_Allegany.mxd
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Census Tracks

• Census tracts
• are geographic regions defined for the purpose of
  taking a census
• are delineated for most metropolitan areas and
  other densely populated counties by local census
  statistical areas committees
• are small, relatively permanent statistical
  subdivisions of a county.
• usually have between 2,500 and 8,000 persons and
  are designed to be homogeneous with respect to
  population characteristics, economic status, and
  living conditions.
• coincide with the limits of cities, towns or
  other administrative areas
• census tracts are subdivided into block groups
  and census blocks.
• can be obtained from MdProperty View data with
  demographic information
• See, MdPro_Mont_CT_SPC83

Census Tracks
Block Groups
Blocks
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• Census Tracks
• 1218 tracks in MD
• Census Block Groups
• 3678 groups in MD
• Census Blocks
• 79128 blocks in MD

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Census Track Data in MdProperty View

• What data we can get from it? (see handout)
• Total Population of each census track
• White, Black, Asian, etc.
• Total population of 18 years old and over
• White, Black, Asian, etc.

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Census Track Data in MdProperty View
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TAZ by local MPO

• Traffic Analysis Zone
• A traffic analysis zone (TAZ) is a special area
  delineated by state and/or local transportation
  officials for tabulating traffic-related data-
  especially journey-to-work and place-of-work
  statistics.
• A TAZ usually consists of one or more census
  blocks, block groups, or census tracts, and is
  constructed by census block information.
• The critical information included in a TAZ are
• No. of automobiles, Household income, and
  employment within these zones.
• This information helps to further the
  understanding of trips that are produced and
  attracted within the zone.
• TAZ data can be obtained from local MPO
• MWCOG (Metropolitan Washington Council of
  Government
• BMC (Baltimore Metropolitan Council)

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Traffic Analysis Zone
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TIGER/LineShapefiles

• Topologically Integrated Geographic Encoding and
  Referencing system
• TIGER/LineShapefiles are spatial extracts from
  the Census Bureau's MAF/TIGER database,
  containing features such as roads, railroads,
  rivers, as well as legal and statistical
  geographic areas.
• You can download TIGER/LineShapefiles of the
  area that you are interested in, and use it to
  make your road network.
• http//www.census.gov/geo/www/tiger/
• The TIGER/LineShapefiles do not include
  demographic data, but they contain geographic
  entity codes that can be linked to the Census
  Bureaus demographic data, available on American
  FactFinder

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TIGER files for Montgomery County
TIGER file
Maryland Highways from other sources