Shapefiles & GeoBase
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Address Matching and Geocoding Resources
-- locating addresses, assigning latitude-longitude, census tract lookup
Address matching and geocoding resources have improved dramatically in recent years. Files derived from the Census 2010 TIGER/Line files have improved access to better address matching and geographic coding content ... but that is just a start. The underlying principle used in the address matching involves assigning geographic codes (such as a census tract or school district) and latitude-longitude based on the address location matched to a road/street line segment.
To perform address matching and geocoding, an address-oriented file and a geographic base file are required. The streets shapefiles dbase file provides the geographic base file. These shapefiles cover all types of roads ranging from interstate highways to jeep trails. They cover the U.S. from wall-to-wall though degree of coverage is usually best in metropolitan areas and larger places.
Within some limits, these files provide descriptive attributes of every road/street segment in the U.S. as characterized between each set of intersections. We know the name, address ranges, geographic codes, demographic, and other characteristics of each side of these road/street segments and the latitude-longitude of each intersection (to and from nodes at each end of the road/street segment).
Shapefiles, a term corresponding to a specific way in which cartographic areas structured in a data file context, may be used for applications broader than address matching and geocoding. Roads/streets shapefiles may be used to view street locations and their attributes superimposed on other layers such as county or ZIP code boundaries using mapping software. The same mapping/GIS software can use the shapefile dbfs (dbase files) as an address matching geographic base file.
The GeoBase roads/streets shapefiles, derived from the Census Bureau Census 2010 TIGER/Line files have been developed by ProximityOne for the U.S. These shapefiles provide an affordable and accurate means of address matching and geocoding your address-oriented data (though the quality and usefulness of address structures is not as good in more rural areas characterized by RFD and related non-street property locators). In addition, the streets shapefiles have been augmented to associate the ZIP code, census tract and census block code with any street segment (intersection to intersection) in the U.S. This enables you to associate the street segment with its corresponding demographic attributes of the ZIP code, census tract, or census block on each side of the street segment. You can directly tie in data from the Census Tracts Demographics files (specialized extracts of tract level data) that provide demographic data on the population, income, and population below poverty level.
Proximity develops geodemographic-economic data and analytical tools and helps organizations knit together and use diverse data in a decision-making and analytical framework. We develop custom demographic/economic estimates and projections, develop geographic and geocoded address files, and assist with impact and geospatial analyses. Wide-ranging organizations use our tools (software, data, methodologies) to analyze their own data integrated with other data. Contact Proximity (888-364-7656) with questions about data covered in this section or to discuss custom estimates, projections or analyses for your areas of interest.