Baseline (surveying)
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/* 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]]