| 词条 | Quadrangle (geography) |
| 释义 |
In geology or geography, the word "quadrangle" usually refers to a United States Geological Survey (USGS) 7.5-minute quadrangle map, which are usually named after a local physiographic feature. The shorthand "quad" is also used, especially with the name of the map; for example, "the Ranger Creek, Texas quad map". These maps are one-quarter of the older 15-minute series. On a quadrangle map, the north and south limits of the quadrangle are not straight lines, but are actually curved to match Earth's lines of latitude on the standard projection. The east and west limits are usually not parallel as they match Earth's lines of longitude. In the United States, a 7.5 minute quadrangle map covers an area of {{convert|49|to|70|sqmi|km2}}.[1] The surfaces of other planets have also been divided into quadrangles by the USGS. Martian quadrangles are also named after local features.[2] Quadrangles that lie on the pole of a body are also sometimes called "areas" instead, since they are circular rather than four-sided. See also
References1. ^Map Scales, Fact Sheet FS105-02, (February 2002) 2. ^{{cite book| title=Mapping Mars: Science, Imagination, and the Birth of a World| first=Oliver| last=Morton| publisher=Picador USA| location=New York| year=2002| isbn=0-312-24551-3| pages=98}} 1 : Cartography |
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