Geospatial-temporal analysis of land-use changes in the Yellow River Delta during the last 40 years   总被引：5，自引：0，他引：5  

Qinghua?YeEmail author  Gaohuan?Liu  Guoliang?Tian  Shenliang?Chen  Chong?Huang  Shupeng?Chen  Qingshen?Liu  Jun?Chang  Yanan?Shi 《中国科学D辑(英文版)》2004,47(11):1008-1024

Research on land use/land cover changes (LUCC)has been the core project of the Global EnvironmentalChanges since the 1990s[1—6]. Scientists at home andabroad have been laying emphasis on integrationstudies on land-use change by “space and process”features[7—10] as researches on LUCC are in a greatdeal. It is of paramount important for us to studyLUCC at various spatial-temporal scales and build aquantitative assessment of land-use conversion by in-tegrated spatial-temporal features. …  相似文献   

2005年11月26日九江—瑞昌地震场地影响的初步分析     

吕红山  卢福水  王建荣  李俊福  俞言祥 《震灾防御技术》2006,1(1):63-69

分析了2005年11月26日九江-瑞昌地震震害与当地工程场地条件间的关系,结果表明：当地工程地质条件复杂,水平向变化大,软土发育,存在溶洞,是此次地震灾害严重的一个重要原因。灾后重建应开展地震小区划工作,为抗震设防提供科学依据。  相似文献   

GIS在定向运动中的应用   总被引：2，自引：0，他引：2  

范冲  邹峥嵘 《测绘工程》2006,15(2):70-72,76

介绍了GIS在定向地图制作方面的应用、在定向运动的场地选择中的应用以及在定向运动的比赛路线设计中的应用。结合实例,分析了目前定向地图制作方面存在的问题,提出了基于GIS的定向地图辅助设计系统的开发框架和开发方案。  相似文献   

传输型立体测绘卫星定位误差分析与评估     

王新义  高连义  尹明  王建荣 《测绘科学技术学报》2012,(6):427-429,434

分析了影响传输型立体测绘卫星影像定位精度的误差源,建立了星地误差仿真与评估模型,进行了星地链路误差仿真计算。实践表明:利用星地全链路误差仿真与评估数学模型可以实现星地误差链路的定量分析,为卫星系统指标论证和研制提供技术支撑。  相似文献   

汶川地震重灾区泥石流沟内崩滑物空间分布的RS-GIS定量方法   总被引：1，自引：0，他引：1  

张怀珍  范建容  胡凯衡  郭芬芬  刘飞  陈阳 《山地学报》2012,(1):78-86

汶川地震在山区引发大量崩塌、滑坡,形成大量的固体松散碎屑物质堆积在沟谷内(CLCAR,崩滑碎屑区),使得地震山区泥石流活动性增强。以岷江上游四川省汶川县银杏乡、映秀镇的15条泥石流沟的SPOT遥感影像为基础,利用GIS技术对CLCAR空间分布进行分析。建立CLCAR与流域高程、主沟侧距和沟口纵距的分布函数T(x)、M(x)和G(x),对CLCAR的空间分布特征进行描述;并计算其积分(DT、DM和DG)作为CLCAR空间分布特征的定量化参数。结果表明,函数T(x)、M(x)和G(x)能够较全面描述CLCAR的空间分布特征,DT、DM和DG能够作为CLCAR空间分布特征的定量化参数。泥石流沟谷内CLCAR的空间分布对泥石流的形成及规模具有一定的影响;在对灾区泥石流研究时有必要考虑泥石流沟内CLCAR空间分布特征。  相似文献   

2011年4月17日广东强对流天气过程分析   总被引：6，自引：1，他引：5  

张涛  方翀  朱文剑  章国材  周庆亮 《气象》2012,38(7):814-818

利用地面和高空观测、卫星、雷达和闪电及自动站资料对2011年4月1 7日出现在广东省的强对流天气的背景和演变进行了分析和总结,本次强对流过程出现了短时强降水、雷雨大风和冰雹等强对流天气,具有风力强、中尺度强风暴系统明显、局地性强和灾情严重等特点。分析表明,地面锋面抬升是本次强对流天气发生的主要触发机制,珠三角地区的地形平坦、广东中层的干急流以及较大的垂直风切变可能是强风暴系统发展和维持的主要因素。最后,本文也分析了当时的主观预报思路并提出了一些思考和总结。  相似文献   

Variability of soil moisture and its relationship with surface albedo and soil thermal parameters over the Loess Plateau   总被引：9，自引：0，他引：9  

管晓丹  黄建平  郭铌  闭建荣  王国印 《大气科学进展》2009,26(4):692-700

Data from July 2006 to June 2008 observed at SACOL(Semi-Arid Climate and Environment Observatory of Lanzhou University,35.946°N,104.137°E,elev.1961 m),a semi-arid site in Northwest China,are used to study seasonal variability of soil moisture,along with surface albedo and other soil thermal parameters, such as heat capacity,thermal conductivity and thermal diffusivity,and their relationships to soil moisture content.The results indicate that surface albedo decreases with increases in soil moisture content,s...  相似文献   

基于熵权法的我国西部地区历史地震灾害等级划分     

任静  张方浩  陈雅慧  张云芝  段乙好  谭专条  张小涛  岳冲 《地震地磁观测与研究》2022,43(1):51-62

选取1990—2019年我国西部地区258次破坏性地震事件的灾害损失资料进行空间化处理,以每次地震烈度区的面积、死亡人数、受伤人数、直接经济损失等4个灾害损失量为指标,运用熵权法确定各指标的权重系数,划分我国西部地区各市(州)的5个历史地震灾害等级.结果表明,历史地震灾害极重的区域是四川省阿坝藏族羌族自治州、青海省玉树...  相似文献   

Development of the Automatic Seeing Monitor for the Site Testing of Dome A     

Pei Chong  Yuan Xiang-Yan  Chen Hua-Lin  Zhao Jian-Lin  WEN Hai-Kun  Li Zheng-Yang 《Chinese Astronomy and Astrophysics》2012

The Antarctic site-testing campaigns have shown that Dome C is an excellent astronomical site on the earth, it is better than any of existing mid-latitude astronomical sites in the world, because of its cold and dry weather, low infrared background radiation, continuously observable time as long as 3–4 months, clear and highly transparent atmosphere, low wind speed, and the absence of dust and light pollution. And in the international astronomical community it is generally believed that Dome A with a higher altitude may be better than Dome C as a potential excellent astronomical site. In the past 3 years, although held by the Center for Antarctic Astronomy of Chinese Academy of Sciences, the site testing at Dome A has preliminarily con?rmed the many advantages of Dome A as an excellent astronomical site, but the data about the atmospheric seeing, which is an important parameter for assessing the site quality for optical observations, have not been obtained until now. Hence, on the basis of a commercial telescope with the diameter of 35 cm, we have made the hardware reformation and software development to have it operate as a DIMM (Differential Image Motion Monitor), which can simultaneously monitor both the seeing and isoplanatic angle at Dome A automatically. At present this instrument has been shipped to Antarctica by the “Xuelong” exploration ship, and will be installed at Dome A, and begin to work in early 2011. Before the shipment, by through the comparative measurements together with an existing seeing monitor at the Xinglong astronomical station, the software, hardware, as well as the installation and adjustment of the instrument, are further veri?ed by testing.  相似文献   

Peculiar early-type galaxies with central star formation     

Chong Ge  Qiu-Sheng Gu 《天体物理学报》2012,(5):485-499

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