新疆英巴扎地区植被动态变化的监测与分析   总被引：10，自引：1，他引：9  

王让会 《国土资源遥感》1999,10(1):43-48

分别采用1983年、1992年及1996年的全色航片,彩红外航片及JERS-1/VNIR数字合成影像,编制不同时期塔里木河中游英巴扎地区植被类型图,并在ARC/INFO软件支持下分析植被面积及植被分布格局的动态变化,揭示了植被变化的自然及人为因素,总结了遥感与GIS相结合研究植被变化及其它资源环境问题的优越性。  相似文献   

全国土地动态监测系统总体研究--全国耕、林、草地总量和土地动态监测分析决策支持系统   总被引：1，自引：0，他引：1  

寇有观  吴敏 《国土资源遥感》1999,(1):319

讨论了全国土地动态监测系统的目标、任务和可行性,提出了系统总体设计思路和土地利用分类编码标准。  相似文献   

An intercomparison of GEOSAT, TOPEX and ERS1 measurements of wind speed and wave height     

I. R. Young 《Ocean Engineering》1999,26(1):67

Mean monthly values of altimeter wind speed and wave height are compared with data from NDBC buoys. As a result of these comparisons, corrections are made to the raw data products available from these satellites. Data from the GEOSAT, TOPEX and ERS1 missions corrected in this fashion are used to show that there have been no measurable changes in the global wind and wave climate during the 10 years spanned by these various missions. It is proposed that the corrected values of wind speed and wave height provide the basis for the formation of a long-term global data base which spans the periods of these multiple missions.  相似文献   

青藏高原北缘库木库里盆地的遥感初步解译   总被引：1，自引：1，他引：0       下载免费PDF全文

程维明  张明刚  张辉 《盐湖研究》1999,7(4):9-14

从地质构造、水系、地层和岩性、地貌类型和道路交通几个方面,对青藏高原北缘库木库里盆地的遥感图象进行了初步解译,并据此进行了综合分析。  相似文献   

地震灾害损失评估数据库的设计与建立──以唐山地震为例     

张渊智  朱博勤  魏成阶  于天旭  张宗科 《遥感学报》1996,(1)

建立地震灾害损失评估数据库是以ＩＬＷＩＳ和ＰＣＡＲＣ／ＩＮＦＯＧＩＳ软件为工作平台。它能支持矢量格式的专题图件、栅格形成的遥感数据及关系表中的属性数据；它还可以实现矢量－栅格转换；而且数据库中的属性数据作为一个独立的关系表格存贮，并对应于其相关的空间单元。该数据库是以１９７６年唐山地震的航空遥感资料为基础，主要分３步进行。第一：建立地震区的基础地理数据库，包括：地理坐标、河流水系、县级行政区、公路、铁路和居民点；第二：应用航空遥感数据（航空影象）进行震区建筑物倒毁、生命线工程破坏及场地震害的分类分级，建立地震灾害数据库；第三：在ＧＩＳ支持下，生成高烈度区包络线，并进行地震灾害据失评估。  相似文献   

LiDAR-based fluvial remote sensing to assess 50–100-year human-driven channel changes at a regional level: The case of the Piedmont Region,Italy     

S. Bizzi  H. Piégay  L. Demarchi  W. Van de Bund  C.J. Weissteiner  F. Gob 《地球表面变化过程与地形》2019,44(2):471-489

Remote Sensing (RS) technology has recently offered new and promising opportunities to analyze river systems. In this paper, we present a calibration of characteristic Hydraulic Scaling Law (HSL) using a regional database of river geomorphic features. We consistently linked discharge with channel geometry features for estimated Bankfull Channel Depth (eBCD), Active Channel Width (ACW), and Low Flow water Channel Width (LFCW), which are continuously available from RS data along the river course. We then used historical information and external sources of information on channel reaches that were relatively unaffected by human pressure over periods ranging from a few decades to a century (measured in comparable geographical areas) to infer relatively Unaltered HSLs (rUHSLs). Adopting rUHSL validated with available local historical evidence on channel geometry, we were able to assess historical changes in channel geometry consistently over the entire region and within the studied temporal window. The case study was conducted for the Po basin in the Piedmont Region, north-west Italy. From our analysis, it emerges that regionally 74% of the river network has riverbed incisions exceeding 1 m, while 66% of channels have halved their historical widths with a total of 617 ha of land subtracted from the active channel. LFCW is, on average, wider in Alpine rivers compared with those located in the North Apennines. Although it is currently not possible to measure the accuracy of these estimates, the evidence generated is coherent with available historical information, characteristic hydraulic scaling laws, evidence from relatively unaltered reaches and the available literature on local fluvial systems. This methodology provides robust, novel and quantitative information regarding decadal to secular channel changes that have occurred on a regional scale. This new layer of information enriches our ability to rationally address assessments of large-scale past and future channel trajectories. © 2018 John Wiley & Sons, Ltd.  相似文献   

面向对象高分辨率影像信息提取中的尺度效应研究   总被引：1，自引：0，他引：1  

张俊  王宝山  吕宝庆 《北京测绘》2010,(1):11-14

研究了遥感信息提取中的尺度效应问题,进行了影像对象分形维数、紧凑度、面积、均值、标准差和与邻域均值差分等指标的实验研究,发现所有类别对象的这些指标值都会随尺度变化发生不同程度的变化,相同的地物在不同的尺度上的表现均是不同的,不同目标在影像上具有的特征值、尺度是不同的,需要在最佳尺度影像中提取感兴趣信息。  相似文献   

SPOT地面场定标与星上定标结果的比较分析   总被引：5，自引：0，他引：5  

田庆久  郑兰芬  童庆禧 《遥感学报》1998,2(1):13-18

本文研究是在遥感辐射定标场选择的基础。利用６Ｓ大气辐射传输模型进行ＳＰＯＴ遥感数据的定标和地物的光谱反射率反演,即在遥感器飞越辐射定标场上空,在定标场选择若干像元区,测量遥感器对应的各波段地物的光谱反射率和大气光谱参量,并利用大气辐射传输模型给出遥感器人瞳处各光谱带的辐射亮度,最后确定它与遥感器对应输出的数字量化的数量关系,求解定标系数。然后,对相应的研究训练区的遥感数据进行大气辐射校正,进而反演训练区内的地物光谱反射率。最后,通过将反演值与实地测量的地物光谱反射率进行对比分析,来估算定标不确定度,并比较说明两种不同方式定标差异及优势和限制。  相似文献   

Monitoring glacier and supra-glacier lakes from space in Mt. Qomolangma region of the Himalayas on the Tibetan Plateau in China   总被引：6，自引：2，他引：4  

Alfred Stein 《山地科学学报》2009,6(3):211-220

Because of the large number and remoteness, satellite data, including microwave data and optical imagery, have commonly been used in alpine glaciers surveys. Using remote sensing and Geographical Information System （GIS） techniques, the paper presents the results of a multitemporal satellite glacier extent mapping and glacier changes by glacier sizes in the Mt. Qomolangma region at the northern slopes of the middle Himalayas over the Tibetan Plateau. Glaciers in this region have both retreated and advanced in the past 35 years, with retreat dominating. The glacier retreat area was 3.23 km2 （or o.75 km^2 yr^-1 during 1974 and 1976, 8.68 km^2 （or 0.36 km^2 yr^-1 during 1976 and 1992, 1.44 km^2 （or 0.12 km^2 yr^-1） during 1992-2ooo. 1.14 km^2 （or 0.22 km^2 yr^-1 during 2000-2003, and 0.52 km^2 （or 0.07 km^2 yr^-1 during 2003-2008, respectively. While supra-glacier lakes on the debris-terminus of the Rongbuk Glacier were enlarged dramatically at the same time, from 0.05 km^2 in 1974 increased to 0.71 km^2 in 2008, which was more than 13 times larger in the last 35 years. In addition, glacier changes also showed spatial differences, for example, glacier retreat rate was the fastest at glacier termini between 5400 and 5700 m a.s.l than at other elevations. The result also shows that glaciers in the middle Himalayas retreat almost at a same pace with those in the western Himalayas.  相似文献   

遥感地学分析与中国遥感事业——纪念陈述彭先生逝世一周年     

杨晓梅  周成虎 《地理信息世界》2009,7(5):14-16

作为一代科学宗师,陈述彭先生是我国遥感地学分析的先驱、是遥感应用研究的开创者,陈述彭先生的逝世,不仅是我国遥感界甚至整个科学界的一大损失。值此逝世一年之际,回顾陈先生开创和繁荣遥感事业的历程,深刻缅怀陈述彭院士在推动我国地理学、地图学、遥感应用、地理信息系统等学科发展中的卓越贡献,以表达我们对他的敬意。  相似文献