摘要
历史航空影像真实地反映了各个历史时期的地表形态、社会经济与环境状况等信息,客观有效地记录了地表演化变迁过程。早期历史航片山地植被覆盖率低,城市建筑物相对稀疏,通过航测法获取的DEM数据理论上可以直接反映山地的地形,且精度会优于现今植被茂密、覆盖率高的数码航片获取的DEM精度。本文基于区域网空三加密、密集匹配以及滤波分类等关键技术,对1979年浙江省某市北部山地区域秃山地表航空影像资料进行处理,获取高精度DEM数据,并通过与机载激光雷达获取的点云数据以及野外实地高程点测量值进行比较。结果表明,通过历史秃山地表航空影像获取的DEM数据山地精度优于0.8 m。
Historical aerial imagery truly reflects the surface morphology,socio-economic and environmental conditions of each historical period,and objectively and effectively records the process of surface evolution and change.Early historical aerial photographs have low vegetation coverage and relatively sparse urban buildings.The DEM data obtained by historical aerial imagery can theoretically directly reflect the mountain terrain,and the accuracy will be better than that obtained by digital aerial photographs with dense vegetation and high coverage.In this paper,based on the key technologies such as aerial triangulation in regional network,dense matching and filtering classification,the historical aerial imagery data of the bald mountain area in northern Zhejiang Province in 1979 are processed to obtain high-precision DEM data,and compared with the 3-D points cloud data obtained by airborne lidar and the points elevation of field survey.The results show that the accuracy of DEM data acquired from historical aerial images of bald mountains is better than 0.8 meter.
作者
丁小蔚
邓廷起
徐大展
江瑞
DING Xiaowei;DENG Tingqi;XU Dazhan;JIANG Rui(Zhejiang Huayun Electric Power Engineering Design Consulting Co.,Ltd.,Hangzhou 310014,China;The Second Surveying and Mapping Institute of Zhejiang Povince,Hangzhou 310012,China)
出处
《测绘与空间地理信息》
2019年第11期129-132,共4页
Geomatics & Spatial Information Technology
关键词
历史航片
秃山地表
数字高程模型
密集匹配
滤波分类
historical aerial photograph
bald mountain surface
digital elevation model
dense matching
filtering classification
