一种利用坡度分区滤波的DEM转换等高线方法
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摘要
针对DEM转换等高线时,现有方法不能方便、有效处理好曲线光滑与地貌精度损失之间的关系,提出了基于坡度分区滤波的DEM转换等高线方法。对不同的坡度分区采用不同大小的窗口进行均值滤波,并对滤波高程差值进行控制,较好地处理了曲线光滑与地貌精度损失之间的关系;同时,对计曲线之间的窄部首曲线进行自动识别和打断删除。基于该方法,利用Arc GIS+Python脚本开发了DEM到等高线自动转换工具,在数字广西地理空间框架建设1∶1万DLG项目的等高线采集工作中得到了初步应用,取得了良好的效果。
While converting DEM into contours,the existing methods are incapable to find a good balance between curve smoothness and the loss of topographic accuracy. Thus,the authors thought of the method of converting DEM into contours based on slope division filtering. This method uses different-sized windows to average filter the slope division and control the filtering elevation difference,which better balances the curve smoothness and the loss of topographic accuracy and meanwhile automatically recognizes,interrupts and deletes the narrow intermediate contours between the index contours. The authors made use of the Arc GIS+Python script to develop a tool which could automatically convert DEM into contours. The tool was applied in contours collecting in the program of Digital Guangxi Geo Spatial Framework Construction and had got good results.
While converting DEM into contours,the existing methods are incapable to find a good balance between curve smoothness and the loss of topographic accuracy. Thus,the authors thought of the method of converting DEM into contours based on slope division filtering. This method uses different-sized windows to average filter the slope division and control the filtering elevation difference,which better balances the curve smoothness and the loss of topographic accuracy and meanwhile automatically recognizes,interrupts and deletes the narrow intermediate contours between the index contours. The authors made use of the Arc GIS+Python script to develop a tool which could automatically convert DEM into contours. The tool was applied in contours collecting in the program of Digital Guangxi Geo Spatial Framework Construction and had got good results.
引文
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[3]李珵,卢小平,杨尚波,等.基于点云数据的地貌要素自适应提取方法[J].测绘通报,2013(10):30-33.
[4]盛志鹏,吴迪,朱萍.利用影像匹配点云进行DLG等高线制作[J].测绘通报,2014(2):80-82.
[5]姚春静,胡唯.基于特征约束的R点云等高线自动生成方法[J].长江科学院院报,2014,31(12):113-116.
[6]周小军,王光霞,薛志伟,等.基于化简的等高线综合研究[J].测绘工程,2014,23(2):10-14.
[7]冯梅,钟斌.基于点云自动生成等高线的方法研究[J].测绘与空间地理信息,2012,35(6):87-90.
[8]王春,李虎,杨军生,等.新型格网等高线生成技术与方法[J].地球信息科学,2015,17(2):160-164.
[9]边淑莉,柳佳佳,王海龙,等.基于规则格网DEM的等高线提取算法的优化与实现[J].测绘科学,2008,33(6):151-153.
[10]龚恒,何元清.基于规则格网DEM的等高线绘制与优化[J].计算机与现代化,2015(5):76-80.
[11]李雯静,邱佳,林志勇,等.曲线弯曲识别与等高线簇结构化方法[J].测绘学报,2013,42(2):295-303.
[12]史巍巍,裘昱,戴宗友.数字高程模型与等高线质量相关性研究[J].测绘通报,2006(2):23-26.
[13]刘妍,怀艳杰.浅谈利用DEM制作等高线的新方法[J].测绘与空间地理信息,2010,33(6):224-225.
[14]刘学军,张平,朱莹.DEM坡度计算的适宜窗口分析[J].测绘学报,2009,38(3):264-271.
[15]ZANDBERGEN P A.面向Arc GIS的Python脚本编程[M].李明巨,刘昱君,译.北京:人民邮电出版社,2014.