共查询到20条相似文献，搜索用时 156 毫秒
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大气程辐射遥感图像与城市大气污染监测研究 总被引：3，自引：0，他引：3
作为对地探测的遥感技术所获取的遥感图像包含了地面和大气信息,并且主要是地面信息.利用地面反射率分布图像将遥感数字图像中弱的大气信息与强的地面目标信息分离,生成仅仅包含大气信息的大气程辐射遥感图像.利用多(高)光谱遥感数字图像中不同波段的大气程辐射遥感图像可以不受地面干扰地对城市大气污染的类型和程度(气溶胶粒径和含量)进行遥感监测.在大气污染地面观测数据(可吸入颗粒物PM10浓度)的支持下,利用MODIS多光谱遥感数字图像生成的对应多光谱大气程辐射遥感数字图像,以上海市为例进行了城市大气污染遥感监测的原理方法研究. 相似文献
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土地利用动态遥感监测 ,主要是对耕地以及建设用地等土地利用变化情况进行定期监测 ,为国家宏观决策提供比较可靠、准确的土地利用变化依据 ;以土地变更调查数据、图件为本底 ,利用遥感图像的处理与识别技术 ,从遥感图像上提取变化信息 ,标注有关土地利用及其变化特征等要素 ,制作成动态遥感监测图。针对土地利用动态遥感监测项目要求 ,论述了具体的整饰方法 相似文献
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在土地利用动态遥感监测中，变化信息提取关键问题。本讨论了运用光谱特征变异法等算法，将宁波市不同时期的SPOT、TM多个图像的光谱信息进行分析、处理与比较，并结合目视判解译，获得2001年度宁波市土地利用变化信息的方法。 相似文献
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土地利用类型变化对环境影响的遥感信息分析 总被引：1，自引：0，他引：1
利用多时相、多分辨率的Ouickbird和SPOT图像进行土地利用变化的监测,对遥感图像上的信息进行分析,利用遥感图像进行土地利用变化信息的自动发现,结合野外调查,分析了土地利用变化对周围环境的积极效应和负面影响。实践表明,对遥感图像的信息分析结合野外调查对于发现土地利用变化对环境的影响是一种有效的方法。 相似文献
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影像融合技术在土地利用动态遥感监测中的应用研究 总被引：1，自引：1，他引：0
国土资源部启动的全国土地利用动态遥感监测项目,通过分析不同时期的卫星影像,从中提取出土地利用变化信息。本文的研究工作,主要是基于作者近几年从事该项目研究与应用的实际,分别以SPOT系列数据、TM数据及QuickBird等中、高分辨率数据作为试验数据,进行影像不同融合算法试验,旨在研究多源遥感影像融合方法在动态监测项目中的应用,并对融合结果进行定性、定量两方面的比较分析,探讨适合土地利用动态遥感监测的融合方法。 相似文献
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社会经济的高速发展带动了城市的空间扩展,引起了城市土地利用结构的变化。为了对城市建设用地和城市发展规模进行合理的调控,应该对城市的扩展进行动态监测。在城区扩展动态监测方面,遥感和地理信息系统已经得到了一定的应用。本研究以湖北省武汉市为例,利用2002年7月9日陆地卫星ETM＋数据,在遥感和地理信息系统技术支持下,开展武... 相似文献
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The aim of this study is to compare the changes that occurred in the main urban land-cover classes of Ulaanbaatar city, Mongolia, during a centralized economy with those that occurred during a market economy and to describe the socio-economic reasons for the changes. For this purpose, multi-temporal remote sensing and geographical information system (GIS) data sets, as well as census data, are used. To extract the reliable urban land-cover information from the selected remotely sensed data sets, a refined parametric classification algorithm that uses spatial thresholds defined from local and contextual knowledge is constructed. Before applying the classification decision rule, some image fusion techniques are applied to the selected remotely sensed data sets to define the most efficient fusion method for training sample selection and for defining local and contextual knowledge. Overall, the study indicates that during the centralized economy significant changes occurred in a ger area of the city, whereas during the market economy the changes occurred in all areas. 相似文献
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遥感信息处理不确定性的可视化表达 总被引：2，自引：0，他引：2
如何全面、准确地度量和可视化表达遥感信息处理中不确定性的程度和空间分布方式,是遥感信息不确定性研究的关键问题之一.传统的度量方法(例如误差矩阵)是将以训练样本集为基础的度量作为总分类精度的度量,而我们需要估计模型对于"样本外数据"的性能.本文首先利用信息论和粗糙集理论等度量遥感分类影像属性信息的不确定性,提出基于像元、目标和影像的遥感信息不确定性度量指标;然后分别描述了基于不同度量指标的可视化表达方式,并对我国黄河三角洲地区的Landsat TM影像进行了分类信息不确定性度量和可视化表达实验. 相似文献
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Zhanfeng Shen Jiancheng Luo Wei Wu Xiaodong Hu 《Journal of the Indian Society of Remote Sensing》2012,40(3):357-370
Object-oriented remotely sensed images processing method has been accepted by more and more experts of remote sensing. To advance the efficiency of data processing, parallel image computing is a good choice since large volumes of data need be analyzed efficiently and rapidly. This paper presents the information extraction method based on per-parcel extraction of high-resolution remotely sensed image; to extract efficiently different information from remotely sensed image, this paper gives the research idea of image rough-classification based on large-scale and subtle-segmentation based on small-scale; to improve the efficiency of image processing, we adapt parallel computing method to solve this problem by presenting an new data-partition method. At last this paper gives the implementation of the research idea based on Message Passing Interface (MPI) and analyzes our experimental system efficiency, and the results show that the new methods can improve the efficiency of high-resolution remotely sensed image data processing efficiently and have a good application. 相似文献
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基于IHS变换和小波变换的遥感影像融合 总被引：18，自引：0，他引：18
在遥感影像融合中，IHS变换法与小波变换法具有互补性，文中把这两种方法结合起来，提出了一种基于IHS变换与小波变换的影像融合方法。通过对具体影像的实验证明，该方法是有效的，达到了预期的目的。 相似文献
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高分辨率多光谱影像城区建筑物提取研究 总被引：4，自引：2，他引：2
城区高空间分辨率遥感数据由于存在大量同物异谱和异物同谱现象,应用传统的基于像元光谱分类的方法进行建筑物分类提取难以取得满意的效果。本文发展了一种从高分辨率Ikonos卫星影像上基于知识规则的面向对象分类提取城区建筑物方法,包括如下步骤：(1)融合1m全色和4m多光谱波段影像,生成1m分辨率的多光谱融合影像;（2）分割融合影像;（3）执行基于对象光谱的最近邻监督分类;（4）应用模糊逻辑分类器结合光谱、空间、纹理和上下文特征等知识规则进行建筑物分类。精度统计结果表明,本文提出的分类方法提取城区建筑物取得了93%的精度。 相似文献
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Poonam S. Tiwari H. Pande Ashwini Kumar Pandey 《Journal of the Indian Society of Remote Sensing》2009,37(2):223-231
Automatic road extraction from remotely sensed images has been an active research in urban area during last few decades. But
such study becomes difficult in urban environment due to mix of natural and man-made features. This research explores methodology
for semiautomatic extraction of urban roads. An integrated approach of airborne laser scanning (ALS) altimetry and high-resolution
data has been used to extract road and differentiate them from flyovers. Object oriented fuzzy rule based approach classifies
roads from high resolution satellite images. Complete road network is extracted with the combination of ALS and high-resolution
data. The results show that an integration of LiDAR data and IKONOS data gives better accuracy for automatic road extraction.
The method was applied on urban area of Amsterdam, The Netherlands. 相似文献
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面向多分辨率层次结构的遥感影像分析方法 总被引：5，自引：0，他引：5
朱国宾 《武汉大学学报(信息科学版)》2003,28(3):315-320
将输入数据源经过扩展分段处理，形成具有不同分辨率层次结构的影像目标。通过构建同层次目标之间、不同分辨率层次目标之间的关系，将目标识别、目标语义提取以及影像信息提取集成在单一的平台完成。 相似文献
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C. R. Suribabu J. Bhaskar T. R. Neelakantan 《Journal of the Indian Society of Remote Sensing》2012,40(4):699-708
The rapid growth of urban population in India is a cause of concern among country??s urban and town planners for efficient urban planning. The drastic growth of urban areas has resulted in sharp land use and land cover changes. In recent years, the significance of spatial data technologies, especially the application of remotely sensed data and geographical information systems (GIS) has been widely used. The present study investigates the urban growth of Tiruchirapalli city, Tamilnadu using IRS satellite data for the years 1989, 1992, 1995, 1998, 2001, 2004, 2007, and 2010. The eight satellite images are enhanced using convolution spatial enhancement method with Kernel (7?×?7) edge enhance function. Supervised classification method is used to classify the urban land use and land cover. The GIS is used to prepare the different layers belonging to various land uses identified from remotely sensed data. The analysis of the results show the drastic increase of built up area and reduced green cover within the city boundary limit. 相似文献
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Eco-Geomorphological zonation of The Bangaram Reef, Lakshadweep 总被引：1，自引：0，他引：1
Benidhar Deshmukh Anjali Bahuguna Shailesh Nayak V. K. Dhargalkar T. G. Jagtap 《Journal of the Indian Society of Remote Sensing》2005,33(1):99-106
Coral reefs, which are known for rich biological diversity and productivity, are being threatened throughout the world by various natural and anthropogenic activities. The present study concentrates on establishing methodology to zone the geo-morphological and ecological zones of the Bangaram reef (of atoll type), Lakshadweep islands, using remotely sensed data and adequately supported by field data. Classification system has been evolved to zone the reefs. Comparative studies have also been carried out using image processing techniques in order to establish the suitable technique for studying the Indian reefs. The IRS LISS III images representing three different tidal conditions of the period 1998-2000 were analyzed. The unsupervised classification of both the raw images as well as principal component images gave similar information. The classified product was subjected to contextual editing. Misclassification among various classes was found to increase with the increase in the depth of the water column present over the reef. The zones identified on the image are central deep lagoon, reef knolls (rising steeply from the central deep lagoon floor), reef edge, reef platform, coralline shelf, broad shallow sandy-bottomed lagoon, beach and two islets. The zonation has helped in getting information on the presence of live corals on the Bangaram reef. This kind of study is a valuable input in assessing the health of the reefs and its diversity. 相似文献