Retrieval algorithm for microwave surface emissivities based on multi-source, remote-sensing data: An assessment on the Qinghai-Tibet Plateau   总被引：1，自引：0，他引：1  

WANG YongQian  SHI JianCheng  LIU ZhiHong  PENG YingJie  LIU WenJuan 《中国科学:地球科学(英文版)》2013,(1):93-101

The Qinghai-Tibet Plateau plays a very important role in studying severe weather in China and around the globe because of its unique characteristics. Moreover, the surface emissivities of the Qinghai-Tibet Plateau are also important for retrieving surface and atmospheric parameters. In the current study, a retrieval algorithm was developed to retrieve the surface emissivities of the Qinghai-Tibet Plateau. The developed algorithm was derived from the radiative transfer model and was first validated using simulated data from a one-dimensional microwave simulator. The simulated results show good precision. Then, the surface emissivities of the Qinghai-Tibet Plateau were retrieved using brightness temperatures from the advanced microwave-scanning radiometer and atmospheric profile data from the moderate resolution imaging spectroradiometer. Finally, the features of the time and space distribution of the retrieved results were analyzed. In terms of spatial characteristics, a spatial distribution con- sistency was found between the retrieved results and surface coverage types of the Qinghai-Tibet Plateau. In terms of time characteristics, the changes in emissivity, which were within 0.01 for every day, were not evident within a one-month time scale. In addition, surface emissivities are sensitive to rainfall. The reasonability of the retrieved results indicates that the algorithm is feasible. A time-series surface emissivity database on the Qinghai-Tibet Plateau can be built using the developed algorithm, and then other surface or atmospheric parameters would have high retrieval precision to support related geological re- search on the Qinghai-Tibet Plateau.  相似文献   

抑螺防病林建设中生物材料的筛选及抑螺机理研究进展   总被引：1，自引：0，他引：1  

孙启祥  彭镇华 《湿地科学与管理》2013,(3):8-11

血吸虫病是一种严重危害人们身体健康的重大传染病,林业血防生态工程建设是防治血吸虫病的有效手段,生物材料的筛选是林业血防建设的重要环节。阐述了抑螺防病林建设中生物(植物、微生物)材料筛选及研究进展,并从钉螺生理响应和解剖结构等方面系统分析了生物材料抑螺机理。  相似文献   

基于GIS的坡面泥石流危险性评价     

蒋艾君  吴亮  彭强  吕飞扬  李天兴 《测绘与空间地理信息》2013,(9)

综合不同的泥石流评价因子对泥石流危险性进行了研究,利用地理信息系统（ GIS）来计算潜在的泥石流危险区域。选取虹口乡高原村与庙坝村共处坡面为研究区域,在ArcGIS中生成研究区域的坡面立体图。选取适当的评级指标,确定了流域内主要的泥石流影响因子。采用层次分析法得出各主要因子的权重值,将各因子划分为五个不同等级,并分别对各个因子进行数值化和归一化处理。利用ArcGIS形成各评价因子专题层,再分别给不同评价栅格赋权重值,最终运用叠置分析与插值分析得出研究坡面的不同色带所表示的危险等级区划图,从而实现单坡面泥石流危险性的评价。  相似文献   

基于GIS和物联网的特种行业管理信息系统的设计与实现     

吴亚南  池天河  彭玲 《测绘通报》2013,(7):88-91

针对我国特种行业的管理现状,提出一种结合GIS和物联网的特种行业管理信息系统的概念,阐述该系统的体系架构、主要功能模块及系统所涉及的三网融合、室内三维建模、智能GIS分析等关键技术,并重点介绍GIS技术和物联网技术在特种行业自动化、网络化、数字化管理方面的重要应用。  相似文献   

MapGIS与MapStar在城市地图更新多边形拓扑重建中的应用研究     

彭丕洪  郭先春  马霞 《北京测绘》2013,(1):44-46,54

多边形拓扑重建是城市地图更新建库工作中关键性的一步,针对MapStar中拓扑重建的存在的问题,笔者采用MapGIS建拓朴,MapStar赋属性两者相结合的一种方法,能快速完成的多边形拓扑关系的重建,提高建库速度,实验证明,采用此方法,在城市地图更新建库工作过程中可提高30%-40%的工作效率。  相似文献   

基于决策树的机载LiDAR点云数据分类     

杜娜娜  彭军还 《测绘科学》2013,(3):118-120

本文采用基于决策树的人工智能方式,通过对点云数据分割、提取分割片轮廓,手动设置地物的约束条件来提取LiDAR点云中的地物。两组实验表明,本文的方法能够成功提取点云数据中的建筑物、车辆等地物;要提高精度,需增加点云密度,因此本文方法适用于较平坦的城镇地区。  相似文献   

影响华南汛期持续性强降水年际变化的大气环流和海温异常     

林爱兰  谷德军  李春晖  郑彬  彭冬冬 《热带气象学报》2022,38(1):1-10

利用1961—2017年中国地面观测站日降水资料、全球大气多要素和海表温度月资料,分析华南区域持续性强降水过程的气候特征,诊断并比较与华南前汛期、后汛期区域持续性强降水年际变化相关的大气环流和海表温度异常特征。结果表明,3—12月华南都可能出现持续性强降水过程,其中汛期4—9月的占了94.4%。伴随着区域持续性强降水的年际变化,华南本地垂直上升运动显著异常是前汛期和后汛期的共同点,但前汛期、后汛期在华南及周边环流异常、水汽输送来源以及海温异常分布等方面都存在一定差异。在前汛期华南区域持续性强降水偏重年,赤道西太平洋区域海温偏低,由于大气罗斯贝波响应使西太平洋副热带高压偏强,热带西太平洋向华南区域水汽输送加强,从而有利于区域持续性强降水偏重。后汛期华南区域持续性强降水偏重年的海温异常分布是赤道中东太平洋区域正异常、东印度洋至西太平洋暖池区负异常,海温异常通过西北太平洋副热带高压、南海热带季风强度、水汽输送和垂直环流等多方面,导致后汛期区域持续性强降水偏重。   相似文献   

Comprehensive Marine Observing Experiment Based on High-Altitude Large Unmanned Aerial Vehicle(South China Sea Experiment2020 of the “Petrel Project”)     

Xuefen ZHANG  Liangxu LI  Rongkang YANG  Ran GUO  Xia SUN  Jianping LUO  Hongbin CHEN  Daxin LIU  Kebing TANG  Wenwu PENG  Xiaodong HAN  Qiyun GUO  Xiaoxia LI  Xikun FEI 《大气科学进展》2021,38(4):531-537

In collaboration with 12 other institutions, the Meteorological Observation Center of the China Meteorological Administration undertook a comprehensive marine observation experiment in the South China Sea using the Yilong-10 high-altitude large unmanned aerial vehicle(UAV). The Yilong-10 UAV carried a self-developed dropsonde system and a millimeter-wave cloud radar system. In addition, a solar-powered unmanned surface vessel and two drifting buoys were used. The experiment was further supported by an intelligent, reciprocating horizontal drifting radiosonde system that was deployed from the Sansha Meteorological Observing Station, with the intent of producing a stereoscopic observation over the South China Sea. Comprehensive three-dimensional observations were collected using the system from 31 July to2 August, 2020. This information was used to investigate the formation and development processes of Typhoon Sinlaku(2020). The data contain measurements of 21 oceanic and meteorological parameters acquired by the five devices, along with video footage from the UAV. The data proved very helpful in determining the actual location and intensity of Typhoon Sinlaku(2020). The experiment demonstrates the feasibility of using a high-altitude, large UAV to fill in the gaps between operational meteorological observations of marine areas and typhoons near China, and marks a milestone for the use of such data for analyzing the structure and impact of a typhoon in the South China Sea. It also demonstrates the potential for establishing operational UAV meteorological observing systems in the future, and the assimilation of such data into numerical weather prediction models.  相似文献   

新的构造控矿类型——螺旋构造控矿     

李睿  任军丽  彭玉鲸  郭嘉琨  殷悦 《吉林地质》2012,(3):1-7

概括天宝山新兴角砾岩筒铅锌矿,山东七宝火山岩型金矿,安徽铜陵凤凰山铜矿,辽宁簸箕山磷矿,辽宁清源红透山铜(锌)矿等构造控矿实例的解读,表明它们可建立一种新的构造控矿类型——螺旋构造控矿。受幔团螺旋运动上冲的地幔热柱多级浸演化的幔枝构造制约。  相似文献   

中国东北兴蒙—吉黑造山带贝加尔运动、萨拉伊尔运动、兴凯运动及泛非运动等之比较     

苑凤华  彭玉鲸  周晓东  李文锁 《吉林地质》2012,(4):1-13,27

近一个世纪以来,中国东北兴蒙—吉黑造山带及毗邻地域发生在前寒武纪末期或寒武纪的一场造山运动,一直为国内外地质学家所关注。先后提出过:贝加尔运动、萨拉伊尔运动、兴凯运动、泛非运动等来描述或界定这场伟大的造山作用。本文综合区域已有实际资料:区域性角度不整合-磨拉石建造出现的时限,造山花岗岩的测年数据,变质热事件的记录,构造活动残留的遗迹等,界定该期构造运动相对最符合贝加尔运动或兴凯运动创建之原意。而创建兴凯运动的典型区,其时限的可确定性和认知度尤佳,故建议在这诸多用语中,精选"兴凯运动"一语为最宜。  相似文献