Baseline (surveying) 1485232 213388823 2008-05-19T02:50:31Z Geneous 7128911 /* See also */ Add "See also" link to similar page under different title, namely "Principal_meridians". {{otheruses4|the use of ''baseline'' in surveys|other uses|Baseline}} [[Image:Meridians-baselines.png|thumb|300px|right|This BLM map depicts the principal meridians and baselines used in the surveyal of the United States.]] In the United States [[Public Land Survey System]], a '''baseline''' is the principal east-west line that divides [[survey township]]s between north and south. The baseline meets its corresponding [[meridian (geography)|meridian]] at the point of origin, or ''initial point'', for the land survey. For example, the baseline for [[Nebraska]] and [[Kansas]] is shared as the border for both states, at the [[40th parallel]]. Often, a baseline is marked by other features such as a road or boundary between counties. =="Baseline Road" in the United States== In [[Little Rock]], [[Arkansas]], Baseline St. follows the baseline used by surveyors of the [[Louisiana Purchase]]. In [[Colorado]], [[Baseline Road (Colorado)|Baseline Road]] in [[Boulder, Colorado|Boulder]] marks the 40th parallel, or the western extension of the Kansas-Nebraska boundary, which is also the boundary between [[Adams County, Colorado|Adams]] and [[Weld County, Colorado|Weld]] counties. In [[Arizona]], the baseline near the [[Phoenix, Arizona|Phoenix]] metro area is marked by [[Baseline Road (Arizona)|Baseline Road]]. In Southern California, from Highland to San Dimas, the baseline is marked by [[Baseline Road (California)|Baseline Road]]. In Michigan, the baseline for the [[Michigan Survey]] forms the boundary between the second and third tiers of counties and in many portions, discontinuous segments of road along the baseline are known as "[[Baseline Road (Michigan)|Baseline Road]]." Baseline Road in Hillsboro, Oregon, generally follows the Hillsboro CBL (Calibration Base Line). ==Canada== In Canadian land surveying, a '''base line''' is one of the many principal east-west lines that correspond to 4 tiers of townships (2 tiers north and 2 south). Each base line is about 24 miles apart, with the first base line at the [[49th parallel]], the Western US-Canadian border. It is therefore equivalent to the ''standard parallel'' in the US system. == See also == * [[Public Land Survey System]] (United States) * [[Dominion Land Survey]] (Canada) * [[Survey township]] * [[Decumanus Maximus]] * [[Principal_meridians]] [[Category:Surveying]]