面状居民地Morphing变换的转向角函数法

摘要

A residential area feature morphing method based on steering angle function is presented .To residential area with the same representation under two different scales ,transforming the representation of the residential area polygon from vector coordinates to steering angle function ,then using the steering angle function to match ,and finding out the similarity and the differences between the residential areas under different scale to get the steering angle function of the the residential areas under any middle scale , the final ,transforming the middle scale steering angle function to vector coordinates form ,and get the middle shape interpolation of the the residential area polygon .Experimental results show:the residential area morphing method by using steering angle function presented can realize the continuous multi‐scale representation under the premise of keeping in shape for the residenti al area with the rectangul ar boundary features .%提出了一种基于转向角函数的面状居民地morphing方法。针对同名居民地实体在两个不同比例尺下的表达，将传统矢量GI S的坐标串表达形式转为转向角函数表达形式，基于转向角函数分析多边形边特征在不同比例尺下的共性与差异，融合得到了任意中间比例尺下的多边形的转向角函数，最后将中间比例尺下的转向角函数还原为矢量坐标串形式，获得多边形在对应尺度的中间插值形状。试验证明，本文提出的基于转向角函数的面状居民地morphi ng方法对面状居民地多边形具有较好的适应性，能在保持直角化边界特征的前提下实现连续地图综合与多尺度表达。