Analysis of ecological quality in Lhasa Metropolitan Area during 1990–2017 based on remote sensing a

来源 :Journal of Geographical Sciences | 被引量 : 0次 | 上传用户:hayyangxiong
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Based on a total of 519 images, the composite images with the lowest possible cloud cover were generated at pixel level with image synthesis method on Google Earth Engine(GEE) platform. The Remote Sensing Ecological Index(RSEI) was adopted, and calcula
其他文献
2020年12月27日,全国地理学研究生联合会(简称地研联)成立15周年纪念会议暨第16届理事会换届会议在北京召开。来自80余家理事单位的领导、老师和学生300余人通过线上和线下形式参会。会议由地研联第15届理事会秘书长田巍主持。第15届理事会主席顾伟男做"全国地理学研究生联合会15周年发展历程总结"报告,完整回顾了地研联的发展历程。中国地理学会副理事长兼秘书长张国友研究员、中国地理学会青年工作委
期刊
Soil aggregate stability, as an important indicator of soil functions, may be affected by seasonal freezing and thawing(SFT)and land use in high cold and wet regions. Therefore, comprehensive understa
期刊
Water retention is important in forest ecosystem services. The heterogeneity analysis of water-retention capacity and its influencing factors is of great significance for the construction of water-ret
期刊
Detailed information on the spatio-temporal changes of cropland soil organic carbon(SOC) can significantly contribute to the improvement of soil fertility and mitigate climate change. Nonetheless, inf
期刊
Delineating life circles is an essential prerequisite for urban community life circle planning. Recent studies combined the environmental contexts with residents global positioning system(GPS) data to
期刊
As a matter of expediency, most existing corporate-based urban networks can only be quantitatively measured by either counting the number of linkages or calculating the product of estimated service va
期刊
Environmental stress is used as an indicator of the overall pressure on regional environmental systems caused by the output of various pollutants as a result of human activities. Based on the pollutan
期刊
Mobile information and communication technologies(MICTs) have fully penetrated everyday life in smart societies; this has greatly compressed time, space, and distance, and consequently, reshaped resid
期刊
在传统的制造工艺中,环面蜗轮滚刀刀齿的顶后角面由手工磨削,不能保证滚刀刀齿刃带面的宽度;滚刀的每一个几何特征曲面是通过不同的制造工艺采用不同的机床加工生成,工艺繁琐且制造效率低。为了简化滚刀制造工艺,提高制造效率和刃带面的制造精度,本文提出一种滚刀半自动计算机辅助设计(Computer aided design,CAD)方法。首先建立滚刀螺旋面和侧后角面数学模型,在此基础上提出一种滚刀刀齿顶后角面
期刊
一、示值误差的校准1.被校对象氯化氢气体检测报警器,测量范围:0~20μmol/mol、0~50μmol/mol。2.校准方法在正常工作条件下,仪器通电预热稳定后,按照使用说明书标定仪器,先通入零点气体校准仪器的零点,再通入浓度约为满量程80%的气体标准物质,预吸附一定时间后校准仪器。然后分别通入浓度约为满量程20%、50%和80%的气体标准物质,记录仪器稳定示值,每种浓度重复测量3次,
期刊