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How do we determine the form of slope from the contour line method?
To find the slope of a feature, the horizontal distance (run) as well as the vertical distance (rise) between two points on a line parallel to the feature need to be determined. The slope is obtained by dividing the rise over run. Multiply this ratio by 100 to express slope as a percentage.
What is the height of contour on teeth?
The height of contour (crest of curvature) is the greatest amount of a curve, or greatest convexity or bulge, farthest from the root axis line. The height of contour on the facial or lingual surfaces of the crown is where this greatest bulge would be touched by a tangent line drawn parallel to the root axis line.
Why is height of contour important?
The proximal contact areas formed mesially and distally by the height of contour are important in maintaining tooth position and stability, preventing rotation and drift.
What is gingival height?
It can range from 3-12 mm in height. Free gingiva – This tissue is not attached and forms a collar around the tooth. The trough around the tooth is called the sulcus and its depth is normally 1-3 mm.
How to draw contour lines at specific heights?
To draw the contour lines at specific heights, specify levels as a vector of monotonically increasing values. To draw the contours at one height ( k ), specify levels as a two-element row vector [k k]. contour ( ___,LineSpec) specifies the style and color of the contour lines.
How to draw a profile from a contour map?
From the contour map, a profile can be drawn of the terrain. Example 2 – Draw a profile showing the elevations of the contours. Note: The intervals are increasing, therefore, the contours indicate a hill. The peak is normally considered to be located at half the interval distance. Widely separated contour lines indicate a gentle slope.
How are contour lines and intervals related to elevation?
A contour interval is the vertical distance or difference in elevation between contour lines. Index contours are bold or thicker lines that appear at every fifth contour line. If the numbers associated with specific contour lines are increasing, the elevation of the terrain is also increasing.
What do index contour lines on a map mean?
Index contours are bold or thicker lines that appear at every fifth contour line. If the numbers associated with specific contour lines are increasing, the elevation of the terrain is also increasing.