![]() As an example, on a map with a contour interval of 20 ft, the distance of a point from the lower contour line is 10 cm, and the distance between the lower contour and the next higher contour line is 30 cm. Finally, add the resulting fraction of the contour interval to the lower contour elevation to obtain the point's estimated elevation. Then apply that proportion to the contour interval. Next, determine the distance from the point to the lower contour, as a proportion of the total distance between the two contours. The procedure for estimating the elevation at any location is to first draw a line through the point whose elevation is to be determined in the direction of maximum slopes, that is, at right angles to the contour lines. If, for example, a point is located halfway between two contour lines, the point's elevation is estimated as being halfway between the elevation values of those lines. ![]() In the absence of additional information, linear interpolation is a logical procedure that involves using rules of proportionality for the estimate. Linear interpolation is based on the assumption that the slope between contours is constant, an assumption that may not actually be correct, and that introduces potential errors into the estimation. If the point falls between contours, however, a technique called linear interpolation may be used to arrive at the estimated elevation. If the point whose elevation is to be estimated falls on a contour line, the elevation of that contour is the best estimate of the point. Elevations at other locations must be estimated. On contour maps the elevations of benchmarks and other spot locations are often given exactly. HENDRICKS, in Environmental Monitoring and Characterization, 2004 DETERMINATION OF ELEVATION Examples include western Europe and the western U.S.A.ĭ.M. Continental extension and rifting is also an important geologic process and results in thinned crust. ![]() These regions have high topography and are subject to rapid erosion. Indeed, the crust with a thickness in excess of 50 km is almost always a young, active mountain belt. For example, the crust of western Australia is older (3000 Ma.) than central Australia (less than 2000 Ma.), yet the crust is at least 10 km thinner in western Australia. The crust does not show a pattern of increased thickness with age, as would be the case if it were repeatedly subjected to igneous intrusions from the underlying mantle. 6) only shows large-scale crustal features, thus some regions of locally thick crust are not visible. Crust that is thicker than 50 km is restricted to a few regions, including the Tibetan Plateau of western China, the Andes of western South America, and the Precambrian shield of southern Finland. The crust is typically 30 km thick at the ocean-continent margin and gradually increases toward the continental interior to 40–45 km. Ocean basins have 6–7 km thick crust (not including 4–5 km of water) and continents have an average thickness of 39.7 km. 6) shows the bimodal division of the earth's crustal thickness. Send us feedback.A contour map of global crustal thickness ( Fig. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'contour map.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. 2018 The system creates a contour map of the glass surface. 2018 The waste near Sand Point looks like hills on contour maps of the seafloor, said Chris Gebhardt, a compliance officer for the EPA.Īlex Demarban, Anchorage Daily News, 2 Mar. 2022 Many locals don’t put much stock in the models Massport uses to create noise contour maps, published in massive reports long after the readings are taken.Ĭhris Berdik,, The test tower at the Mirror Lab uses interferometry to create contour maps of the glass surfaces. Recent Examples on the Web In addition to updating the noise contour map, Loudoun County’s proposal would require such disclosures for every home sale, not just the initial sale, anywhere within the district map.
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