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The above figure displays the hierarchy of census geography. Geographic Hierarchy for the 1990 decennial Census Census Bureau defined census tract or blockgroup.
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Before continuing to discuss geocoding, it’s important that you know a bit about census geography, since the geographic code that is typically affixed to an address during geocoding is either the U.S. Our project utilized primarily geocoding technology. Once the latitude and longitude are known, you can then figure out all sorts of other geocodes to affix by determining what geographic regions the specified point lies in, e.g., what ZIPcode does this point lie in? What census tract? What census blockgroup? What police precinct? Appending any of these codes to a specific street address is considered geocoding. (So, one geocode that you’re probably already familiar with is your ZIPcode.) Usually however, when someone talks about geocoding, they are talking about geocodes that are a bit more specific, i.e., affixing to an individual address its latitude and longitude – which is, very simply, the vertical and horizontal distance of a point relative to the equator. For more examples of GIS technology at work, visit Geocoding is the assignment of a code – usually numeric - to a geographic location. For example, you might combine a layer of cholera outbreaks with a layer of water sources to be able to display graphically the relationship between the two. GIS – Geographical Information Systems – are technology based systems that combine layers of geographic data to give you a better understanding of a particular place. GIS and Geocoding are two terms that you’ve probably been hearing a lot about recently.