Lecture 10- 2.21.docx - Geographic Areal Unit o Natural areal unit those natural geographic elements that have 2 dimensions such as lakes farms cities

Lecture 10- 2.21.docx - Geographic Areal Unit o Natural...

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Geographic Areal Unit o Natural areal unit: those natural geographic elements that have 2 dimensions, such as lakes, farms, cities, countries o Artificial areal unit: imposed by researchers in their attempt to facilitate data collection, such as census tracts o Singular areal unit: correspond to only themselves, such as zip code o Aggregate units: An aggregate unit is composed of several singular units, such as counties made of several census tracts and census tract is composed of many block groups Geographic areal unit o Geographic areas are organized in a geographic hierarchy. Larger units, like states, include small units, like counties and census tracts. The structure is derived from the legal, administrative, or areal relationships of the entities Geographic Scale o Geographic Scale : means the size of the area to be studied and determines the level of precision and generalization. Micro-scale studies deal with the studies to be done over small areas, while macro-scale studies are related to those over larger areas. Map Scale vs Other Scales o Map or cartographic scale: refers to the ratio of a distance on a map to the corresponding distance on the ground. A large scale map covers a smaller area and the map generally has more detailed information. On the other hand, a small scale map
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