Transcript CEGR697: Geographic Information Systems Application in

CEGR697: Geographic Information Systems
Application in Transportation
Chapter 3: Data Acquisition and
processing
Instructor: Min-Wook Kang
[email protected]
443-885-1442
www.eng.morgan.edu\~cegr697
Outline
Chapter 2 Objective
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Understand/Get familiar with some useful spatial data
popularly used for GIS-T
List of Useful Spatial Data
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MdProperty Data
Census Tracks / Census Block Groups / Census Blocks
TAZ by local MPO (Metropolitan Planning Organization)
TIGER file
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MdProperty Data
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What data we can get?
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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?
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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
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Census tracts
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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
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See, MdPro_Mont_CT_SPC83
Census Tracks
Block Groups
Blocks
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Census Tracks
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Census Block Groups
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1218 tracks in MD
3678 groups in MD
Census Blocks
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79128 blocks in MD
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Census Track Data in
MdProperty View
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What data we can get from it? (see handout)
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Total Population of each census track
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White, Black, Asian, etc.
Total population of 18 years old and over
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White, Black, Asian, etc.
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Census Track Data in MdProperty View
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TAZ by local MPO
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Traffic Analysis Zone
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A traffic analysis zone (TAZ) is a special area delineated by state and/or local
transportation officials for tabulating traffic-related data- especially journey-towork 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
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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
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MWCOG (Metropolitan Washington Council of Government
BMC (Baltimore Metropolitan Council)
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Traffic Analysis Zone
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TIGER/Line®Shapefiles
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Topologically Integrated Geographic Encoding and Referencing
system
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TIGER/Line®Shapefiles 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.
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You can download TIGER/Line®Shapefiles 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/Line®Shapefiles do not include demographic data, but
they contain geographic entity codes that can be linked to the
Census Bureau’s demographic data, available on American
FactFinder
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TIGER files for Montgomery County
TIGER file
Maryland
Highways from
other sources
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