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21.
机载LIDAR技术解决了如何快速、准确地获取地物高度的难题,同时为地物高度信息的应用提供了有效的技术手段。本文根据地理国情普查中建筑物分类指标体系,分析离散点云数据高程关系和分类过程,实现了一种基于点云阶层式分类的城市建筑物高度分级的技术方法,并在Terrascan软件环境下验证了该方法的可行性和快速性。 相似文献
22.
Spatial variation of altitudinal belts as dividing index between warm temperate and subtropical zones in the Qinling-Daba Mountains 总被引：1，自引：0，他引：1
To determine the dividing index between warm temperate and subtropical zones based on the spectra of altitudinal belts,this paper collected 33 spectra of altitudinal belts in the Qinling-Daba Mountains from published literatures and then analyzed the structures and the spatial patterns from south to north,from west to east and based on exposure directions.The results show that:1)From south to north,the basal belt gradually changes from subtropical evergreen broadleaf forest to warm temperate deciduous broadleaf forest;the spectra of altitudinal belts change from complex to simple;the dominant belt changes from montane broadleaf-conifer mixed forest and evergreen-deciduous broadleaf mixed forest to deciduous broadleaf forest.2)From west to east,the structures of the altitudinal belt spectra show complexity in the east and west but simplicity in the middle section;the upper limits of both the evergreen-deciduous broadleaf mixed forest belt and montane deciduous broadleaf forest belt present a quadratic curve distribution pattern in the longitudinal direction.However,the upper limit of the montane broadleaf-conifer mixed forest belt exhibits a nearly linear decrease in the west-east direction.3)Both the north and south slopes in the Qinling Mountains have the similar basal belt,whereas it varies greatly between the north and south slopes in the Daba Mountains.Comparably,dominant belts are very similar in the Qinling Mountains and the north slope of the Daba Mountains,but the south slope of the Daba Mountains has its own unique dominant belt:evergreen-deciduous broadleaf mixed forest.This implies that the Daba Mountains are more appropriate than the Qinling Mountains to act as the boundary between subtropical and warm-temperate zones in central China. 相似文献
23.
50年来东北黑土区土地利用变化对沟蚀的影响——以克东地区为例 总被引：2，自引：0，他引：2
以位于东北典型黑土区的克东地区作为研究区,以1965年的Corona、2005年的SPOT5和2015年高分一号影像作为数据源,通过目视解译获取研究区对应年份的侵蚀沟分布状况;以1954年地形图和1975年的Landsat/MSS、2005年和2015年的Landsat/TM影像为数据源分别获取1965年、2005年和2015年土地利用数据;以侵蚀沟裂度为指标从土地利用变化角度分析研究区近50年来沟蚀变化状况。结果表明：黑土区沟壑侵蚀状况日益严重,耕地中侵蚀沟面积最大、侵蚀沟裂度增长速度最快;耕地、草地和建设用地上沟蚀状况的加剧伴随着林地和未利用地的开垦;耕地和草地相互转换裂度变化最大,退耕还林还草短期内侵蚀沟裂度仍然很高,但随着近10年来“退耕还林”的推行和用地状况的改善,沟蚀虽仍在发展但速度趋于缓慢。 相似文献