GEOG 121 Project 6:
Geocoding Addresses with TIGER/Line Files


Janet Beekman

The name of my home county is Centre and it is in Pennsylvania. The gecoded location on my map is 970 E McCormick Ave which is the street address that I live at. I live in the neighborhood called Valimont. In particular I'm the first lot in the Valimont II section. This is on your left if you come to McCormick from Penn State along University Drive. I also back into Walnut Spring Park which is at the end of Easterly Parkway. The lines and the polygon background of the map are made from Topologically Integerated Geographic Encoding and Referencing(TIGER)/line data. The mark indicating the location of my address was made using the Address Matching function in ESRI ArcExplorer 2.0 software using geocoding. This is a process which takes tabular data and uses it to show what street that the house is on based on the boundaries of that street. One of the features and attributes that are included in the TIGER database that enable automatic geocoding is that a street is a chain and at the end of the chain are two ending points called nodes. The location of the street depends on if the house address is even or odd and which position on the street that the house is on with respect to the to node and the from node. In the image you can see that my house is on the right side of the road.

TIGER/line data supports the census because when the census data is associated with the road lines, or polygon areas of the county TIGER/line map, it can be used to identify roads, houses and other buildings located on those roads. In addition to supporting the U.S. Census, the TIGER/LIne data is used by MapQuest.com(www.mapquest.com) to provide users with map and driving directions from one location to another. MapQuest has it's own database of addresses which is associates with the TIGER/Line data in the same way the U. S. Census does.

Sources
DiBiase, David (2002) Understanding Geographic Data. Module 6: Census Data. ESRI Virtual Campus http://campus.esri.com Accessed 5 December 2004.
Environmental Systems Research Institute (2004) The Geography Network. http://www.geographynetwork.com/ Accessed 5 December 2004.
Environmental Systems Research Institute (2004) ArcExplorer -- ESRI's Free GIS Data Viewer. http://www.esri.com/software/arcexplorer/index.html/ Accessed 5 December 2004.
MapQuest Inc(2004). http://www.mapquest.com/ Accessed 5 December 2004.