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2. Level staff - Wikipedia

   en.wikipedia.org/wiki/Level_staff

   Level staff. A level staff, also called levelling rod, is a graduated wooden or aluminium rod, used with a levelling instrument to determine the difference in height between points or heights of points above a vertical datum . When used for stadiametric rangefinding, the level staff is called a stadia rod .

3. Integrated Postsecondary Education Data System - Wikipedia

   en.wikipedia.org/wiki/Integrated_Postsecondary...

   Established. 1992. The Integrated Postsecondary Education Data System ( IPEDS) is a system of interrelated surveys conducted annually by the National Center for Education Statistics (NCES), a part of the Institute for Education Sciences within the United States Department of Education. IPEDS consists of twelve interrelated survey components ...

4. Glossary of levelling terms - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_levelling_terms

   For GTS surveys of the country, surveyors use permanent benchmarks to calculate the elevations of different points. Datum surface – reference plane with respect to which RL of the other survey points is determined. The datum surface may be real or imaginary location with a nominated elevation of zero. The commonly used datum is mean sea level.

5. Level (optical instrument) - Wikipedia

   en.wikipedia.org/wiki/Level_(optical_instrument)

   A level is an optical instrument used to establish or verify points in the same horizontal plane in a process known as levelling. It is used in conjunction with a levelling staff to establish the relative height or levels (the vertical separation) of objects or marks. It is widely used in surveying and construction to measure height differences ...

6. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

7. Survey methodology - Wikipedia

   en.wikipedia.org/wiki/Survey_methodology

   Survey methodology is "the study of survey methods". [1] As a field of applied statistics concentrating on human-research surveys, survey methodology studies the sampling of individual units from a population and associated techniques of survey data collection, such as questionnaire construction and methods for improving the number and accuracy ...