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Definition of Contour interval

Contour interval Definition from Government Dictionaries & Glossaries
DOD Dictionary of Military Terms
(*) Difference in elevation between two adjacent contour lines.
  
Source: U.S. Department of Defense, Joint Doctrine Division. ( About )
Contour interval Definition from Science & Technology Dictionaries & Glossaries
Glossary of Cartographic Terms
Difference in elevation between two adjacent contours.
Contour interval Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
A contour line (also isoline, isopleth, or isarithm) of a function of two variables is a  curve along which the function has a constant value. In cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. A contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness of slopes. The contour interval of a contour map is the difference in elevation between successive contour lines.

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Contour interval Definition from Society & Culture Dictionaries & Glossaries
Outdoor Glossary
the difference in elevation (height) between one contour line and the next. This interval is either expressed in feet or meters.