Before the elevation of any point on the map can be determined, the user must know the contour interval for the map he is using. The contour interval measurement given in the marginal information is the vertical distance between adjacent contour lines.
www.map-reading.com/ch10-3.php
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National Contour Data
40', 200' and 1,000' intervals Elevations in feet and meters
www.apogeemapping.com
Most contour lines on topographic maps are not labeled with elevations. Instead the reader of the map needs to be able to figure out the elevation by using the labeled contour lines and the contour interval (see previous page for explanation).
raider.muc.edu/~mcnaugma/Topographic%20Maps/determining... raider.muc.edu/~mcnaugma/Topographic%20Maps/determining_contour_interval.htm
The contour interval is constant for each map. It will be noted on the margin of the map. You can also determine the contour interval by looking at how many contour lines are between labeled contours. ... Because we only have a piece of the topographic map we can not look at the margin to find the contour interval.
raider.muc.edu/~mcnaugma/Topographic%20Maps/contour.htm raider.muc.edu/~mcnaugma/Topographic%20Maps/contour.htm
Geology question: What is contour interval on a topographic map? Contour interval is the actual change in elevation represented by the space between two adjacent topographic rings. For example, if there ... Contour interval is the actual change in elevation represented by the space between two adjacent topographic "rings".
wiki.answers.com/Q/What_is_contour_interval_on_a_topogr... wiki.answers.com/Q/What_is_contour_interval_on_a_topographic_map
Contour line - Wikipedia, the free encyclopedia
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A contour line (also level set , isopleth , isoline , isogram or isarithm ) of a function of two variables is a curve along which the function has a constant value. In cartography, a conto...
en.wikipedia.org/wiki/Contour_line
"If we want to narrow down the uncertainty for the points that don't lie on contours, we can increase the number of contours by reducing the contour interval! Now, for example, the dots that fall within the pink area have elevations between 800' and 850', instead of between 800' and 900'!
academic.brooklyn.cuny.edu/geology/leveson/core/linksa/... academic.brooklyn.cuny.edu/geology/leveson/core/linksa/contourinterval.html
This scale is listed on a topographic map as the contour interval. The contour interval is the vertical distance represented by consecutive contour lines on the map. In general, the smaller the scale of the map (remember, small scale maps show a larger area of the earth’s surface) the larger the contour interval will be.
geology.isu.edu/geostac/Field_Exercise/topomaps/vert_sc... geology.isu.edu/geostac/Field_Exercise/topomaps/vert_scale.htm
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Buy Contour up to 50% cheaper on best-price.com
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National Contour Data
40', 200' and 1,000' intervals Elevations in feet and meters
www.apogeemapping.com