GIS Dictionary
Definitions for GIS terms related to operations such as analysis, GIS modeling and web-based GIS, cartography, and Esri software.
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baseline
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[surveying]
An accurately surveyed line from which other lines or the angles between them are measured. -
[surveying]
In a U.S. land survey system, a line passing east and west through the origin, used to establish township, section, and quarter-section corners. 
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[GPS]
In GPS, the physical distance between a base station and a rover.
