Time series analysis of optical remote sensing data for the mapping of temporary surface water bodies in sub-Saharan western Africa   总被引：2，自引：0，他引：2  

E.M. Haas  E. Bartholom  B. Combal 《Journal of Hydrology》2009,370(1-4):52-63

A map of temporary small water bodies (TSWB) at 1 km resolution was derived for the arid, semi-arid and dry sub-humid regions of sub-Saharan western Africa where the spatio-temporal distribution of actual surface water occurrence exhibits high inter- and intra-annual variability. Water bodies and humid areas have been mapped and characterized by the analysis of 10 daily small water bodies (SWB) maps based on SPOT VEGETATION (VGT) data spanning the period January 1999–September 2007. Further analysis of the SWB time series provided additional information about the seasonal recurrence of water bodies as well as their hydrological function. A map derived from a continuous time series assures the inclusion of temporary features, a clear advantage compared to other datasets, which are based on several single date observations. The method described in this paper targets at a rapid creation of TSWB maps based on the SWB time series for different time intervals and regions.An accuracy assessment has been carried out with a stratified random sampling approach and a one-stage cluster analysis that relies on high-resolution satellite data to verify the detected water bodies. The overall accuracy, considering only the commission error, is 95.4% for the whole study region, with best results in the arid and semi-arid climate zone. The method to map water bodies delivers satisfactory results, particularly for sparsely vegetated areas as well as flat areas of the study region. In more humid, more vegetated areas and in mountainous areas, the possibility of false detections increases due to surface characteristics.  相似文献   

利用SPOT卫星影像进行1:1万DLG更新的设计与研究   总被引：3，自引：1，他引：2  

杨华先  洪亮  王波  刘俊杰  闵振毅 《地理空间信息》2006,4(5):23-25

通过纠正SPOT遥感影像的方法,快速更新1∶1万地图数据,并通过多种检测手段得出更新后的地图数据的精度。  相似文献   

Detecting co-seismic displacements in glaciated regions: An example from the great November 2002 Denali earthquake using SPOT horizontal offsets   总被引：1，自引：0，他引：1  

Michael H. Taylor  Sebastien Leprince  Jean-Philippe Avouac  Kerry Sieh 《Earth and Planetary Science Letters》2008,270(3-4):209-220

We use SPOT image pairs to determine horizontal offsets associated with the Mw 7.9 November 2002 Denali earthquake in the vicinity of Slate Creek, AK. Field measurements and aerial photographs are used to further characterize the geometry of the surface rupture. Aerial photographs show that shear localization occurs where the rupture trace is linear, and distributed off-fault deformation is common at fault bends and step-overs, or at geologic contacts between rock, glacial sediments, and ice. The displacement field is generated using a sub-pixel cross correlation technique between SPOT images taken before and after the earthquake. We identify the effects of glacier motion in order to isolate the tectonic displacements associated with the Denali earthquake. The resulting horizontal displacement field shows an along-strike variation in dextral shear, with a maximum of approximately 7.5 m in the east near 144° 52′W, which decreases to about 5 m to the west near 145° 45′W. If the November 2002 earthquake represents the long-term behavior of the Denali fault, it implies a westward decrease in the long-term dextral slip rate. A possible mechanism to accommodate the westward decreasing slip on the Denali fault is to transfer fault slip to adjacent east-trending contractional structures in the western region of the central Alaskan Range.  相似文献   

The use of 3-D mapping in geological research and risks analysis: evaluation of a water supply project in the Kathmandu-Melamchi Area     

C. Bardinet  E. Bournay 《GeoJournal》1999,49(2):159-163

Using 2-D and 3-D multi satellite data (SPOT and LANDSAT TM) in a GIS allows us to produce 3-D digital elevation maps (DEM) through the techniques of remote sensing (RS) analysis and computer aided mapping. In the field of geotechnical research, since 1992, some works have been made in cooperation with ICIMOD-MENRIS, the department of Mines and Geology in Nepal, and the bilateral cooperation from both France and Germany. The use of 2-D and 3-D digital maps to geological and geotechnical research and risks analysis, concerns here the evaluation of the new water supply project Kathmandu-Melamchi proposed by WHO-UNDP and the World Bank. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

SPOT卫星影像在德尔尼铜矿区域地质研究中的应用     

史仁灯  杨经绥  李海兵  王希斌  郑新华 《地质通报》2000,19(4):355-360

利用卫星遥感影像对青海省德尔尼铜矿区的区域地质做了判释性研究 :( 1)判释出 3条左旋平移断层及一组羽式构造 ,并测得其中一条断层的左旋平移距离为 12 50m ,而在以往 1∶2 0万和 1∶5万的地质填图中均未发现这 3条断层的平移性质 ;( 2 )判释出作为蛇绿岩组成部分的地幔橄榄岩呈现与一般岩浆岩不同的影像特征。  相似文献   

基于TM和SPOT5影像融合的土地利用分类及精度比较——以朝阳区为例   总被引：1，自引：0，他引：1  

肖汉 《城市地质》2010,5(1):19-23

本文基于TM和SPOT5的影像在ERDASIMAGINE环境中进行融合,在融合前后分别对TM图像与融合后图像进行土地利用分类,对比分类精度并进行定性和定量的解释和分析。本文给出了实验的详细步骤以及完整的评价报告。研究结果表明,融合后图像分类精度有明显提高。对融合后影像进行土地利用分类,在测绘与地图更新、土地利用与城市规划、生态环境监测和政府规划决策等中,具有广阔的应用前景。  相似文献   

SPOT5在矿山监测中的应用   总被引：13，自引：0，他引：13  

况顺达  赵震海 《地质与勘探》2005,41(3):79-82

为了快速监控矿山的实际开采情况与矿山的登记现状之间的差异,维护矿产资源管理秩序,打击无证采矿、越界采矿,保护生态环境,促进依法办矿和科学办矿,先利用SPOT5图像进行目标确定,然后野外检查.通过研究发现,利用遥感手段对煤矿、砂石(建筑用材料)、铝土矿等矿山的监测效果明显.  相似文献   

南京东部地区露采矿山遥感动态监测          下载免费PDF全文

李向前  苏一鸣  朱叶飞  荆慧 《江苏地质》2009,33(2):191-195

以SPOT卫星数据为主要信息源,通过不同时相对比,对南京东部地区露天采矿活动进行了动态监测,详细查明了不同时间段露采矿山的空间展布特征,分析了矿山开采对景观、环境的影响,探讨其与社会经济发展、政府决策之间的内部联系。  相似文献   

Analysis of the landscape change at River Basin scale based on SPOT and TM fusion remote sensing images: a case study of the Weigou River Basin on the Chinese Loess Plateau     

Dong Xiaofeng  Liu Lichen  Wang Jianhua  Shi Jin  Pan Jinghu 《International Journal of Earth Sciences》2009,98(3):651-664

Eco-environmental changes which generally manifest as the ecological landscape changes are mainly affected by natural and human factors. Through complex interaction, natural factors and human activities alter the landscape structure and decide the service function of regional ecosystem. With the development of geographical information system (GIS) and satellite remote sensing (RS) techniques, the researches on quantitative analysis of landscape changes have made great strides forward. In this paper, the landscape change dynamics in the Weigou River basin have been investigated by the combined use of high-resolution RS images and GIS techniques. The objectives are to determine the landscape transition rates among landscape types and to quantify changes of various landscape indexes using FRAGSTATS, one of the spatial pattern analysis programs for categorical maps. Under man–machine interactive interpretation method, all of the 10-m resolution SPOT + TM images are classified into six primary types (farmland, forest, grassland, water, construction area and desert) and 12 sub-types based on the interpretation key which was established based on 1947 filed pictures in the Weigou River basin. A field check on the data accuracy shows that the total interpretation accuracy approaches 97.53%. Significant land-use change has taken place in the Weigou River basin over the six years from 1998 to 2004 due to rehabilitation measures. The results show that there has been a notable decrease in farmland mainly due to conversion to forest and grassland, the landscape heterogeneity and evenness has increased, and there is a greater connectivity. The dominance of farmland patch has decreased. And hence the ecological environment has started to develop in a reversing direction. The study of the integration of high-resolution RS images and GIS technique is an effective approach to analyze the landscape changes at river basin scale.  相似文献   

SPOT5 HRS生成DEM精度评价分析   总被引：2，自引：2，他引：0  

储美华  洪志刚  崔红霞 《测绘科学》2005,30(3):99-100

描述了从SPOT5HRS生成DEM的不同方法,将来源于SPOT5三立体影像的不采用控制点情况下生成的DEM与高精度的参考DEM对比,对HRS生成的DEM进行精度分析评价,证明了在我国西部无图区利用SPOTHRS立体像对生成DEM的可行性。  相似文献