搜索结果: 31-45 共查到“知识库 空间物理学”相关记录1150条 . 查询时间(4.802 秒)
TRAINING, EDUCATION, RESEARCH AND CAPACITY BUILDING NEEDS AND FUTURE REQUIREMENTS IN APPLICATIONS OF GEOSPATIAL TECHNOLOGY FOR WATER RESOURCES MANAGEMENT
Geospatial technology Water resources Education and Training
2019/2/27
In India, water resources are managed at different levels, i.e. at central level by Ministry of Water Resources, River Development & Ganga Rejuvenation, Central Water Commission and Central Ground Wat...
本文基于CSR最新公布的GRACE RL06版本数据，采用Slepian空域反演法估算了南极冰盖27个流域的质量变化.Slepian空域反演法结合了Slepian空间谱集中法和空域反演法的技术优势，能够有效降低GRACE在小区域反演时信号出现的严重泄漏和衰减，进而精确获得南极冰盖在每个流域的质量变化.相对于GRACE RL05版本数据，RL06在条带误差的控制上要更加优化，获得的南极冰盖质量变化时...
A METHOD TO DEFINE THE SPATIAL STATIONS LOCATION IN A CARSHARING SYSTEM IN SÃO PAULO – BRAZIL
Transportation Systems Spatial Analysis Carsharing Station Location
2018/11/9
Sharing mobility systems have become part of a sociodemographic trend that has pushed shared modes from the fringe to the mainstream of the transportation systems. Carsharing is a mode of shared trans...
基于时频分析的电离层多模污染抑制研究
电离层 多模传播 时频分析 污染抑制
2018/5/4
研究高分辨线性时频分析方法和联合时频分析方法，利用这两种方法对高频电离层返回散射探测的多个传播模式实测数据，对污染抑制效果进行分析.结果显示，这两种基于时频分析的方法针对多模和相位污染同时存在的复杂情况，与其他常规方法相比均使杂波谱得到了较好的锐化，目标信号在二维时频域较清楚地显出.因此可以证明，上述两种方法具有很高的应用价值，对天波超视距雷达海上低速目标检测具有重要意义.
GRO（Global Navigation Satellite System Radio Occultation）和LRO（Low Earth Orbit Radio Occultation）联合组网探测地球大气是无线电掩星探测技术的主要发展方向.本文根据掩星事件的数学判据，仿真分析了LEO卫星主要轨道参数对GRO和LRO掩星事件数量和全球分布情况的影响.研究表明：卫星轨道越低GRO掩星事件越多；...
卡尔曼滤波和自相关分析方法短期预报电离层f0F2的比较
电离层 f0F2短期预报 卡尔曼滤波 自相关分析
2018/5/4
电离层参数f0F2的预报是电离层研究的一个重要方向.本文选取2011年北京、长春、青岛和苏州四个常规观测站的f0F2数据，分别采用卡尔曼滤波、自相关分析法和国际参考电离层模型（IRI）对f0F2实施短期预报（提前1h预报），并通过与实际观测数据的对比，对三种方法预报f0F2的性能进行了比较.研究结果表明，在磁平静时期，采用卡尔曼滤波方法进行f0F2预报的均方误差为0.532MHz，相对误差8.11...
A LANDMARK EXTRACTION METHOD ASSOCIATED WITH GEOMETRIC FEATURES AND LOCATION DISTRIBUTION
Landmark Extraction Geometric Features Crevice Horizon Segmentation Voronoi Diagram
2018/5/16
Landmark plays an important role in spatial cognition and spatial knowledge organization. Significance measuring model is the main method of landmark extraction. It is difficult to take account of the...
COMPENSATION OF THE IONOSPHERIC EFFECTS ON SAR INTERFEROGRAM BASED ON RANGE SPLIT-SPECTRUM AND AZIMUTH OFFSET METHODS – A CASE STUDY OF YUSHU EARTHQUAKE
InSAR Ionospheric effects Range split-spectrum Azimuth offset Ionosphere correction Yushu earthquake
2018/5/14
InSAR technique can measure the surface deformation with the accuracy of centimeter-level or even millimeter and therefore has been widely used in the deformation monitoring associated with earthquake...
Spatiotemporal characteristics of urban air quality in China and geographic detection of their determinants
Air Quality Index (AQI) spatiotemporal characteristics geographic detector China
2018/4/9
Ambient air pollution brought by the rapid economic development and industrial production in China has exerted a significant influence on socio-economic activities and public health, especially in the...
ASTEROID (21) LUTETIA: SEMI-AUTOMATIC IMPACT CRATERS DETECTION AND CLASSIFICATION
Asteroid Lutetia Image processing Patter recognition Crater detection
2018/6/4
The need to develop an automated method, independent of lighting and surface conditions, for the identification and measurement of impact craters, as well as the creation of a reliable and efficient t...
COASTLINE DETECTION USING FUSION OF OVER SEGMENTATION AND DISTANCE REGULARIZATION LEVEL SET EVOLUTION
Coastline DRLSE FOOS K-means Clustering Sea-land Segmentation Wavelet Transform
2018/4/18
Coastline detection is a very challenging task in optical remote sensing. However the majority of commonly used methods have been developed for low to medium resolution without specification of the ke...
复杂的矿物组成给测井岩性识别及矿物含量的计算带来了较大难度。对元素俘获测井资料的解释能够有效解决复 杂矿物成分及含量问题。在实际解释过程中所使用的元素与矿物之间转换系数具有较强的地区性,不同地区、不同层位 其转换系数差异较大。提出利用X衍射荧光和X衍射全岩实验分析数据,借助最小二乘方法和广义逆矩阵求解线性方程组, 刻度得到具有地区代表性的矿物与元素之间的转换系数,利用该转换系数对实际资料进行处理,...
基于岩心观察、薄片鉴定、成像测井及物性等资料，结合地球化学分析，塔里木盆地玉北地区奥陶系岩溶储层具有明显的“上下分层、东西分异”特征。纵向上储层可以分为3套，分别为表层（以鹰山组上段为主）、鹰山组下段和蓬莱坝组，表层储层储集空间以裂缝型为主，鹰山组下段以裂缝-溶蚀孔洞型为主，蓬莱坝组则以溶蚀孔洞型为主。平面上储层特征具有明显差异，东部断褶区的断裂带，储层发育，以裂缝型为主，东部断褶区的断洼区、中部...
THE ACQUISITION, PRODUCTION AND DISSEMINATION OF GEOSPATIAL DATA FOR EMERGENCY MANAGEMENT AND PRESERVATION OF CULTURAL HERITAGE
Geospatial data Emergency management Preservation of Cultural Heritage Data-sharing
2017/6/20
The crisis management of a disaster, whether caused naturally or by human action, requires a thorough knowledge of the territory involved, with regard to both its terrain and its developed areas.
The...
SPATIAL INEQUALITY IN THE ACCESSIBILITY TO HOSPITALS IN GREECE
Spatial Analysis Spatial Accessibility Public Hospitals Inequalities
2017/8/10
The aim of this paper is to measure the spatial accessibility to public health care facilities in Greece. We look at population groups disaggregated by age and socioeconomic characteristics. The purpo...