Representing of contour lines by turning point preserving quadratic splines |
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| Abstract: | AbstractTerrain data obtained from satellite imagery or by scanning existing contour maps is in raster mode. Such data may be compressed by detecting and storing the critical points of contour lines. When hand digitising a contour map, a trained digitiser operator would usually select points which visually appear to be critical points. Existing interpolation techniques often fail to restore the critical points, including turning points, to their original positions. This article illustrates the use of splines composed of quadratic Bézier curves with monotone curvature for rendering contour lines which are represented only by their turning and end points, such that the positions of the turning points are preserved. |
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