For consistency, assume that elevations between contour lines are 1/2 a contour interval higher than elevation of the lower line. Interpolate between the contour lines that bracket the point to get the elevation. Determine whether the point is higher or lower than the known elevation by examining the sequence of adjacent contour line elevations and by taking note of nearby feature names, such as "fire tower," "valley," and so forth. Remember that every fifth contour line is a heavier index contour, but you may have to follow contour lines some distance before finding an elevation label. ![]() ![]() This may be a benchmark or a contour line. Find the known elevation closest to the point. Determine the contour interval for the map. ![]() To determine the elevation of a point on a topographic map: 1.
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