A shapefile is a digital vector file used in mapping and geospatial processing applications and contains geometric location and associated attribute information. A shapefile typically contains geographic attributes for points, lines or polygons structured in a specific format. A shapefile that might be referenced as xyz.shp actually consists of a minimum of three files: xyz.shp, xyz.shx, and xyz.dbf.
Shapefiles are used by GIS, mapping and geospatial analysis software such as the CommunityViewer GIS. Thematic and reference maps can be created from the Census Bureau TIGER/Line shapefiles. See examples in the Applications Gallery at http://proximityone.com/gallery/guide.
This section reviews the scope of the Census Bureau TIGER/Line shapefiles and ProximityOne GeoBase shapefiles that may be accessed and used with the Demographic Data Analyst.
The Census Bureau TIGER/Line shapefiles contain data that can be used to represent different types of point, line, and polygon geography covering the U.S. earth surface. The TIGER/Line shapefiles, and related derivative products, play an important role in wide-ranging geospatial analyses and decision-making information solutions.
The TIGER/Line shapefiles include:
• boundary shapefiles for all Census 2010/2000 political and statistical tabulation areas.
• water and landmark area polygon shapefiles.
• road, rail, water and related line/segment-oriented shapefiles.
• point and specific location shapefiles (schools, shopping centers, neighborhoods, etc.)
• related reference files that facilitate geospatial processing.
The Census 2010 TIGER/Line files reflect:
• overall improvements and updates resulting from the Census 2010 LUCA program.
• extensive qualititative and coverage improvement for roads/streets.