The algorithm of creating contour lines based on DEM
Contour line is a closed curve that joined by points of the same elevation.This paper puts forward a new algorithm of creating contour line based on DEM,which uses the method of tracking the same elevation point to study the algorithm based on regular grid.This paper will be divided the algorithm of creating contour line into four sub-algorithms,namely:the algorithm of elevation comparison;the algorithm of calculating the same elevation point coordinates;the algorithm of tracking next point of the same elevation,the algorithm of tracking contour line.The algorithm of elevation comparison is mainly used in judging whether a contour line with appointed elevation passes through a side of the grid;the algorithm of calculating the same elevation point coordinates is used to calculate coordinates of contour lines across the grids side;function of the algorithm of tracking next point of the same elevation is to track next point of the same elevation by following the trend of contour lines;the algorithm of tracking contour line aims in tracking coordinates of the point which has the equal value of elevation with the point in row x and column y.
contour lines creation regular grid tracking next point of the same elevation tracking contour line
TANG Lihua Xu Ai-jun Fang Lu-ming
School of Information Engineering,Zhejiang Forestry University,Linan,Zhejiang,China,11300
国际会议
第16届国际地理信息科学与技术大会(16th International Conference on GeoInformatics and the Joint Conference)
广州
英文
2008-06-28（万方平台首次上网日期，不代表论文的发表时间）