【摘 要】
：
Green development is an important issue of sustainable development in China. Due to the relatively backward economy and the fragile ecological environment, restricted development zones need to embrace
【出 处】
：
Chinese Geographical Science
论文部分内容阅读
Green development is an important issue of sustainable development in China. Due to the relatively backward economy and the fragile ecological environment, restricted development zones need to embrace green development. Taking 38 counties in Jilin Prov
其他文献
The low resolution of Fourier two-dimensional spatial temporal spectrum estimation and the insufficient sample size of sonar space time sampling data often caused difficulties in high-resolution space
The sound propagation characteristics in a canyon environment are analyzed using the data from the northern South China Sea. The experimental results show that the energy begins to bend to a deeper pl
The multibeam backscatter strength(BS) is greatly affected by acoustic scattering mechanism among the process of multibeam acoustic data acquisition, which is the so-called angular response(AR). While
As the "Asian Water Tower" and the source of many major rivers in Asia,the Tibetan Plateau(TP) significantly affects human societies in densely-populated Asia [1].Lakes in the TP have a total area of
工程测量作为测绘的重要组成部分,面向工程的规划、建设与管理提供技术支撑和地理信息服务。在当前技术创新和经济转型的背景下,工程测量既迎来新的发展机会,也面临新的业务挑战。本文在分析工程测量多维度特征和需求供给关系的基础上,从服务于BIM支撑的工程建设与管理、面向工程结构安全的检测监测、适应工程建设项目管理改革要求等方面对工程测量当前发展的几个新动向进行探讨,并提出一些建议。
对于工程地质条件复杂且周边邻近多条隧道的深基坑工程,采用传统勘察设计手段难以满足工程建设需要。本文以重庆中医骨科医院项目深基坑与轨道交通九号线、5A线的相互影响分析为工程案例,依据重庆市地方标准《工程勘察信息模型设计标准》,建立了由地表信息模型、工程地质信息模型、岩土工程设计信息模型三部分组成的模型深度等级为CL300的工程勘察信息模型。该模型将地表情况、地层岩性、拟建物、基坑支挡结构、轨道交通、
国外普遍采用WGS-84椭球,UTM投影,但是UTM投影在大部分国家存在投影变形量超出规范规定的2.5cm/km的问题。本文基于UTM投影变形的特点介绍了两种简便的处理投影变形超限的方法,对在实际工程项目中UTM投影变形超限的处理方法进行探讨和研究。
针对水声信道的多径效应以及海底散射信号信噪比低导致方位估计性能较差的问题,提出了一种基于子阵加权波束形成的UESPRIT算法(Weighted Beamspace UESPRIT Based on Subarrays,BS-BUESPRIT)。首先利用密集波束域转换矩阵估计回波信号的方位谱,进而估计同一时刻到达阵列的回波数目;之后将均匀线阵分为多个尺寸相同、相互重叠的子阵,利用加权波束形成对各子阵
外业数据采集是地质、测绘等行业的基础性工作,无路网数据导航技术是完成外业工作的重要保障。本文提出一种利用轨迹数据聚类生成外业导航路线的方法,通过对已有轨迹数据进行预处理和筛选,然后利用聚类分析从轨迹点中抽取重要轨迹特征点,最后生成导航路线。
The objective of this study is to develop a framework for re-examining and re-defining the classical concepts of spatial interaction and reorganization in the urban system. We introduce a modified rad