What Is a Datum Line?

Answer

Datum line is a fixed, measurable base line used as a reference from which angular or linear measurements are made. It is also called the reference line.
Q&A Related to "What Is a Datum Line"
An imaginary line through the aircraft’s center of gravity usually considered parallel to a line joining the wing tips.
http://www.answers.com/topic/lateral-datum-line
Datum is an imaginary vertical plane from which all horizontal measurements are taken with the aircraft in a level flight attitude.
http://wiki.answers.com/Q/What_is_datum_reference_...
What is a poverty datum line? The most popular way of measuring poverty is by a poverty datum line. The PDL is intended as a measure of poverty. In the 1940, the first official Poverty
http://www.webanswers.com/business/what-is-a-pover...
While avian above has some figures correct, I would make the following definition/observations. Poverty is defined as: If the household income, after housing costs, is less than 60%
http://uk.answers.yahoo.com/question/index?qid=200...
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