遥感学报
遙感學報
요감학보
JOURNAL OF REMOTE SENSING
2009年
5期
827-839
,共13页
苏伟%孙中平%赵冬玲%孙崇利%张超%杨建宇
囌偉%孫中平%趙鼕玲%孫崇利%張超%楊建宇
소위%손중평%조동령%손숭리%장초%양건우
多级移动曲面拟合%LIDAR数据%滤波%二次多项式%自适应阈值
多級移動麯麵擬閤%LIDAR數據%濾波%二次多項式%自適應閾值
다급이동곡면의합%LIDAR수거%려파%이차다항식%자괄응역치
Light Detection and Ranging (LIDAR)%Hierarchical Moving Curved Fitting Algorithm (HMCFA)%filtering%quadratic polynomial%adaptive threshold
为提高城市区LIDAR数据滤波精度,提出了一种多级移动曲面拟合滤波方法.建立区块网格搜寻及索引机制完成对离散LIDAR点云的标示;通过建立二次多项式完成参考曲面的拟合,不同窗口大小获得不同层次的拟合曲面;设置自适应阈值,完成地面点与非地面点的判断.精度评价结果表明,该滤波算法误差在1m以内,能够满足实际应用的需求.
為提高城市區LIDAR數據濾波精度,提齣瞭一種多級移動麯麵擬閤濾波方法.建立區塊網格搜尋及索引機製完成對離散LIDAR點雲的標示;通過建立二次多項式完成參攷麯麵的擬閤,不同窗口大小穫得不同層次的擬閤麯麵;設置自適應閾值,完成地麵點與非地麵點的判斷.精度評價結果錶明,該濾波算法誤差在1m以內,能夠滿足實際應用的需求.
위제고성시구LIDAR수거려파정도,제출료일충다급이동곡면의합려파방법.건립구괴망격수심급색인궤제완성대리산LIDAR점운적표시;통과건립이차다항식완성삼고곡면적의합,불동창구대소획득불동층차적의합곡면;설치자괄응역치,완성지면점여비지면점적판단.정도평개결과표명,해려파산법오차재1m이내,능구만족실제응용적수구.
LIDAR data is accurate 3D data of terrain acquired from airborne laser detection and ranging system. Compared with hardware technique, data post-processing technique of LIDAR data is weak and time consumed. In this situation, a HMCFA (Hierarchical Moving Curved Fitting Algorithm) filtering method of LIDAR data is reported in this paper. Firstly, block grid searching and indexing mechanism is set up to label discrete LIDAR cloud points. Secondly, quadratic polynomial is set up to fit land terrain with different window size. At last, adaptive threshold is used to distinguish ground points and non-ground points. Accuracy assessment results indicate that the filter error is less than lm, which can be used in application.