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With the progress of computers applied to plotters, it has become available to obtain digital contour line data instead of conventional raw manuscripts. Therefore, it became possible to edit contour lines with the help of numerical calculation instead of manual redrawing. Usually computer aided editing is realized by interactive method, however, it also takes long time as manual editing. In order to reduce editing time, an automatic method to compile digital contour lines has been studied. Compilation of contour lines is a kind of smoothing of the surface plane expressed by contour lines. Therefore, simple curved surface (named local DTM, DTM=digital terrain model) is calculated to represent the local terrain within the neighborhood of the concerned point on a contour line. Then the point is to be moved horizontally so that the point is dropped on the computed surface. Local DTM of the neighboring points are so strongly correlated to each other that we can obtain smooth contour lines consist of the moved points. As an application of this method, generation of DEM(=digital elevation model) raster data is mentioned in this paper. The elevation on each intersection of the concemed grid is calculated out by generating its local DTM using neighbouring points.

Automatic compilation of contour lines by local DTM method.