contour interval

noun
the difference in elevation represented by each contour line on a topographic map.
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World English Dictionary
contour interval
 
n
the difference in altitude represented by the space between two contour lines on a map

Collins English Dictionary - Complete & Unabridged 10th Edition
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Dictionary.com's 21st Century Lexicon
Main Entry:  contour interval
Part of Speech:  n
Definition:  any of the spaces between vertical lines on a topographic map or globe; the difference in elevation such an interval represents
Example:  Small contour intervals are used for flat areas; larger intervals are used for mountainous terrain.
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Example sentences
The space between the contour lines represents a set distance, called the
  contour interval.
To find the contour interval on a map, check the legend or find two index
  contours adjacent to each other.
The contour interval of the map tells the difference in elevation between two
  adjacent lines.
Systematic errors may not exceed one contour interval, determined by the source
  map, is the maximum permitted.
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