NGS conducts a cooperative program that provides surveyors with a means to
detect and correct errors in Electronic Distances Measuring
Instruments (EDMI). NGS has established more than 400 EDMI Calibration
Base Lines (CBL) throughout the United States in cooperation with
various government agencies, universities, professional societies, and others.
These highly accurate base lines provide a locally accessible standard for
length measurement. For each state, NGS provides users with location
descriptions and the adjusted results of calibration base line measurements.
Find Data by State:
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Online Resources:
NOTICE! In an effort to make the NGS EDMI CBL Program sustainable and more useful for our partners and customers, NGS is considering significant policy and procedural changes to the program. |
CBL Publications:
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