点云数据抽稀与加密对微地形数据分析的影响  

Effect of Rarefied or Encrypted Point Cloud Data on the Analysis of Micro Topography Observation

作　　者：魏舟[1,2] 李光录[1] 候雷[1] 蔡娟娟[1] 刘馨 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100 [2]陕西省土地工程建设集团,西安712000 [3]勉县水土保持工作站,陕西勉县724200

出　　处：《水土保持研究》2016年第3期283-286,共4页Research of Soil and Water Conservation

基　　金：陕西省水保局重点科技示范项目(20101003);水利部科技推广计划项目(TG1308)

摘　　要：针对不同观测尺度下,大起伏(20cm耕作处理)、微起伏(耙平裸坡处理)两种地形的点云数据进行抽稀、加密处理,选取地表曲率、坡向、地表糙度3种直观的指标对抽稀、加密处理对微地形数据分析的影响进行了评价。结果显示:抽稀与加密处理对于起伏较大的地形曲率影响更为明显,对于起伏较小的地形则影响不显著。5,10mm数据抽稀与加密处理后坡向变化不显著。1mm尺度抽稀地表糙度的影响十分规律,5mm加密与抽稀对于大起伏地形的影响十分复杂,10mm加密对于大起伏地形糙度变化较为复杂,裸坡变化则相对规律。We adopted the point cloud data of deep tillage terrain and bare slope terrain in different observation scale for vacuating and encrypting.The influence on micro topography observation was evaluated through selecting three intuitive indicators of surface ground curvature,aspect and surface roughness.The result shows that vacuating and encrypting have great influence on the large wavy terrain but have little influence on the small wavy terrain such as bare slope.Little change of aspect by vacuating and encrypting 5mm and 10 mm data is contributed by the observation scale for the influence on the surface generalization situation.Vacuating 1mm scale data has regular influence on surface roughness.5mm data will cause complex changes with regard to complex terrain surface roughness through encrypting and vacuating.10 mm data will cause complex changes to deep tillage terrain through encrypting and vacuating,but the changes of bare slope are relatively regular.

关 键 词：微地形 曲率 地表糙度 坡度 

分 类 号：P951[天文地球—自然地理学]