QuickBrid影像的几何校正

普通遥感影像原始数据存在人工操作及仪器误差,其图像总会有变形。此时的遥感数据还是未作数字化加工的原始数据,这样的数据还不能直接被计算机加以分析利用,只有经过几何校正才能投入到实际应用中去[1]。所谓几何校正,就是将一幅含有几何畸变和比例尺差异的原始遥感影像通过一     

SPOT和Landsat ETM +卫星影像结合下的平潭岛防护林资源遥感研究

以SPOT PAN和Landsat ETM+卫星影像为空间信息源,通过对影像数据进行精确配准、不同分辨率的融合、多波段组合分类等处理工作,以平潭岛防护林资源为研究对象,结合地面调查数据,建立防护林资源地理信息系统.在ERDAS IMAGINE和ARC/INFO系统的支持下,得出基于防护林资源的平潭岛遥感分类体系,并对分类结果进行比较,进而分析平潭岛防护林资源的现状、特征及分布规律.     

基于人工神经网络的遥感图像分类研究

随着人工神经网络系统理论的发展,神经网络技术日益成为遥感图像分类处理的有效手段,并有逐步取代最大似然法的趋势。本文重点讨论了遥感图像分类处理研究中应用效果显著的BP神经网络方法,并在MATLAB平台下对基于BP神经网络的分类算法进行了研究,最后将它的分类结果与最大似然法的分类结果进行了精度比较分析。结果表明基于BP神经网络的遥感图像分类效果是较好的,是一种有效的图像分类方法。     

高分辨率自然伽马测井仪器研制方案设计

在国内外文献调研的基础上,针对传统的自然伽马测井仪器的特点,提出了自然伽马测井仪器实现高分辨率的技术关键,并据此进行了高分辨率自然伽马测井仪器研制的初步方案设计,按照本方案研制出的自然伽马测井仪器的纵向分辨率将由传统的0.6米提高到0.4米,曲线重复误差为7%.研制的实际开展表明该方案是科学、合理的,对其他类似研究具有很强的参考价值.     

数字科技

【国际】1．5GB／min 韩国三星电子近日发表了已研发成功的世界上运行速度最快的两种存储卡——“MMC plus”。这两种存储卡的容量均为12GB，读速为每秒40MB，写速为每秒25MB，比现有存储卡约快3倍。换句话说，这两种存储卡可在1分钟之内将保存在卡内的1千张照片或500首MP3音乐或2小时的DVD影像传输到电脑里。该存储器均采用了4GB单级单元（SLC）NAND型闪存技术，而SLC适用于一个芯片配一个存储器的方式，体现快速性，另一方面，如果采用一个芯片上有两个以上存储器的MLC方式，则能够体现大容量。     

Remote sensing of spatial patterns of urban renewal using linear spectral mixture analysis: A case of central urban area of Shanghai (1997―2000)

It is very important to integrate remote sensing with urban geography that the spectral mixture analysis technique is applied to urban land cover evolvement and its eco-environmental effect. Urban land cover is mainly composed of complicated artificial materials, which is the key factor to limit the development of the spectral mixture analysis technique. There are two main aspects in which the technique of spectral mixture analysis is applied to urban geography： one is to calculate vegetation fraction; the other is to build quantitative model of the urban impervious surface obtained from the combination between high albedo fraction and low albedo fraction. The technique of spectral mixture analysis is firstly applied to study urban renewal pattern, scale and mode which happened in Shanghai City from 1997 to 2000,     

Removing the impact of wind direction on remote sensing of sea surface salinity

Sea surface salinity (SSS) plays an important role in the sub-polar area, where intrusions with low salinity influence the deep thermohaline circulation and the meridional heal transport. SSS fields and their seasonal and inter-annual variability are thus…     

Variability of surface circulation in the South China Sea from satellite altimeter data

11-year satellite altimeter sea surface height （SSH） anomaly data from January 1993 to December 2003 are used to present the dominant spatial patterns and temporal variations of the South China Sea （SCS） surface circulation through Empirical Orthogonal Function （EOF） analysis. The first three EOF modes show the obvious seasonal variations of SSH in the SCS. EOF mode one is generally characterized by a basin-wide circulation. Mode two describes the double-cell basin scale circulation structure. The two cells were located off west of the Luzon Island and southeast of Vietnam, respectively. EOF mode three presents the mesoscale eddy structure in the western SCS, which develops into a strong cyclonic eddy rapidly from July to September. EOF mode one and mode three are also embedded with interannual signals, indicating that the SCS surface circulation variation is influenced by El Nino events prominently. The strong El Nino of 1997/98 obviously changed the SCS circulation structure. This study also shows that there existed a series of mesoscale eddies in the western SCS, and their temporal variation indicates intra-seasonal and interannual signals.     

CBERS-02图像在土地利用/覆盖动态监测中的应用

以四川省2000-2004年生态环境动态监测项目为基础，对中巴资源二号卫星（CBERS-02）遥感数据的处理方法和技术流程进行了分析和讨论，并探讨利用CBERS-02卫星遥感图像，结合GIS技术实施快速、准确、经济的大范围土地利用／覆盖状况调查．通过对遥感图像处理和信息提取，查明了研究区2000-2004年期间土地利用／覆盖状况及其动态变化．结果表明，CBERS-02卫星数据可以在土地利用／覆盖动态监测中发挥重要作用，通过与其它遥感资料和实测数据相结合，可以缩短监测周期，降低应用成本．     

DEM转化为TIN过程中的高程误差分布规律

以陕西省耀县1：5万比例尺的DEM为基准数据，以ArcView地理信息系统软件为数据处理平台，研究DEM转化为TIN过程中的高程误差特征。试验的核心环节是测定剖面高差阈值对所构建TIN地形描述精度的影响。试验结果表明，随阈值的增加，高程误差分布具有一定的规律性，通过获得其误差分布模型，为利用TIN对该区进行空间分析提供了一定的精度参考。