CEGR697: Geographic Information Systems Application in Transportation

Chapter 3: Data Acquisition and processing

Instructor: Min-Wook Kangmin-wook.kang@morgan.edu

443-885-1442www.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_SPC83Census 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/Line®Shapefiles Topologically Integrated Geographic Encoding and Referencing

system 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.

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