一种消除DOM变形拉花的新方法  

A new method to eliminate DOM distortion

作　　者：黄秋影 何红梅 吉初云 陈善弟 HUANG Qiuying;HE Hongmei;JI Chuyun;CHEN Shandi(The Fourth Institute of Aerial Surveying and Remote Sensing,Ministry of Natural Resources,Haikou Hainan 570203,China;Hainan Tianya Human Resource Management Service Company Limited,Haikou Hainan 570203,China)

机构地区：[1]自然资源部第四航测遥感院,海南海口570203 [2]海南天涯人力资源管理服务有限公司,海南海口570203

出　　处：《北京测绘》2022年第8期990-996,共7页Beijing Surveying and Mapping

摘　　要：针对数字正射影像(DOM)存在的变形拉花问题,提出一种基于格网抽稀和均值滤波协同处理数字高程模型(DEM)显著消除DOM变形拉花的新方法。通过试验DEM的3种抽稀参数、3种均值滤波模板、3种中值滤波模板,比对不同DEM纠正DOM所消除变形拉花的情况。从而找到最优格网间距15 m和均值滤波模板11×11像素,用以协同处理DEM,其纠正DOM显著消除变形拉花,消除率为78.7%。试验结果表明,使用协同处理后的DEM纠正DOM,有效提高DOM产品质量和生产效率,大幅减少正射校正后期人工处理变形拉花的工作量。本次研究为正射校正过程如何优化DEM,以消除DOM变形拉花提供技术参考和借鉴。A new method was proposed to eliminate the deformation of the digital elevation model(DEM)based on the cooperative processing of grid thinning and mean filtering.By experimenting three kinds of DEM thinning parameters,the mean filtering templates and the median filtering templates,different DEMs were compared for correction of the deformation of digital orthophoto map(DOM).The optimal grid spacing of 15 m and the mean filter template of 11×11 pixels were extracted for the co-processed DEM,which significantly eliminated the deformation by correcting the DOM with the elimination rate of 78.7%.The experimental results showed that using the co-processed DEM to correct DOM effectively improved the quality and productivity of DOM products and significantly reduced the workload of manual processing of distortion pulling at the later stage of ortho-rectification.This study provides technical reference and reference for how to optimize the DEM in the ortho-rectification process to eliminate the deformation distortion of DOM.

关 键 词：数字高程模型 抽稀 均值滤波 中值滤波 数字正射影像 变形拉花 

分 类 号：P237[天文地球—摄影测量与遥感]