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The precision of the system is a key criterion for judging the usefulness of the system.
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The purpose of a location system is to enable the map user to find the coordinates of a point location. Location systems are different from survey systems. Survey Systems in the US What are Survey Systems? Survey systems divide the land into "parcels" for ownership and development. The area codes for land-line telephones can be at least roughly mapped, and it used to be that the next three digits of your phone number (which originally were two letters and a number), referred to as your telephone exchange, also represented mapped areas with boundaries. This is less a locational system today than when the system was younger and under the near-monopoly control of Bell Telephone.
DISADVANTAGES OF METES AND BOUNDS DRIVERS
For example, did you realize that zip codes were assigned alphabetically, not spatially, within counties? It may help ambulance drivers and delivery trucks to know mailing addresses, with familiar road names and a logical arrangement of address numbers, but it would be very difficult to use it as a basis for storing information about the spread of air pollution and creating maps of that pollution. Even though it works well enough for delivering mail and identifying home and business locations, it would not work very well at answering other spatial questions.
DISADVANTAGES OF METES AND BOUNDS CODE
The key to the system today is the division of the land first into political subdivisions, and (below the county level) into zip code areas (including five-digit zip codes and Zip-Plus-4 zipcodes). The postal addressing system in America (as in other countries) has evolved through many eras of population growth, mail sorting technologies and mail delivery technologies. It also has great use by emergency response vehicles, and many other kinds of record keeping, including the US Census and many commercial companies (i.e., junk mail). The postal system is the complex system of zip codes and street addresses used primarily as a mail delivery system. Part of that system includes numbers for the states, counties and municipalities as well. They are properly named FIPS (Federal Information Processing Standards) identification numbers. As you encounter GIS layers, depending on their source, you may see those identification numbers in the layer attribute table.
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Each of the census divisions is identified by numbers, not names. Its larger areas are the US governmental divisions, but its smaller divisions were the Census Tracts, Census Block Groups and Census Blocks. Any system based on names that are not in any spatial order and that must therefore be memorized before they can be used, can hardly be called systematic.Įarlier in the course, the US Census system for data organization was described. However, completely different and inconsistent boundaries are used for US and state government districts (such as the US House of Representatives districts and the completely different Pennsylvania House of Representatives districts), as well as (in Pennsylvania, at least) school districts. If that were the basis for all government operations, it might be considered somewhat efficient. The most straightforward of these is the hierarchy of national, state, county (or equivalent) and municipal (township, borough, town and city) divisions. Many dimensions of government operations depend on identifying which jurisdiction certain activities or phenomena occur in. Naming or Designating Systems: Assigning Names or Categories The US Hierarchy of Governmental Divisions