共查询到20条相似文献，搜索用时 93 毫秒
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受较大分辨率差的影响,OLI多光谱影像与SPOT-6 Pan影像直接融合可能导致融合影像色彩失真。若将OLI多光谱影像与全色影像融合后再与SPOT-6 Pan影像融合,在选用合适融合方法的基础上可得到较好的结果。以新疆伊吾县淖毛湖遥感地质解译为例,采用IHS变换法、Brovey变换法、PCA和Gram-Schmidt Pansharpening(GS)等方法分别对OLI和SPOT-6Pan进行间接融合,并利用主观对比和水平光谱剖面对比两种方法对融合影像进行综合分析与评价。经实地查证,基于OLI与SPOT-6 Pan(GS变换融合)融合影像解译获得的地质界线综合准确率达89.5%。 相似文献
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以黑方台为典型的黄土台塬, 过量农业灌溉造成了区内地下水位上升, 诱发了大量黄土滑坡, 该文选用IKONOS影像对其进行了遥感解译。通过对比PCA变换、Brovey变换、IHS变换和Multiplative变换融合影像效果, 选用PCA变换融合影像作为分析的基础。重点分析了IKONOS影像在黑方台黄土滑坡调查中的应用。在综合分析研究区地质资料和滑坡影像特征的基础上, IKONOS影像在滑坡类型划分、滑坡周界及期次关系确定、空间分布规律和滑坡特征参数统计方面具有很好的应用前景。 相似文献
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许辉熙 《测绘与空间地理信息》2009,32(6):11-14
目前,高分辨率全色遥感影像和低空间分辨率的多光谱遥感影像融合是影像融合技术应用的主流.EN-VI 4.4遥感影像处理软件影像融合处理的工具--SPEAR提供了PCA变换、Gram-Schmid变换、Brovey变换和HSV变换4种专门用于全色与多光谱遥感影像融合的算法.以ETM+全色与多光谱遥感影像融合为例,选择熵、偏差和相关系数3个定量指标,对采用4种融合方法得到的影像进行评价.经综合评价和比较,实验的4种影像融合算法中,Gram-Schmidt变换效果最好. 相似文献
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对两个有关土地利用状况调查区域的高光谱和Quickbird数据进行了数百次算法对比实验,最终确定Sym4和Db2是曲波变换中的最佳小波函数,提出两种基于曲波变换的高光谱遥感图像融合方法,即加权法和选择法,获得了更精确的高光谱遥感融合影像.在一个研究区域,通过对高光谱数据的子带分解、脊波变换、一定融合以及它们的逆变换等曲波变换过程,表明融合的高光谱遥感影像能提供许多有利于土地类型划分和影像识别的精确七地信息.在另一个研究区域,除进行曲波变换外,还通过二次多项式计算实现了高光谱与Quickbird数据遥感影像匹配,最终从高光谱与Quickbird数据获得的遥感融合影像经日视及信息熵、相关系数等评价表明,曲波变换融合图像优于小波变换融合图像,与Brovey融合图像相近,但比PCA融合图像稍差.客观和主观评价证实,曲波变换的遥感融合方法能为高光谱遥感图像在土地利用状况调查提供更多更准确的信息. 相似文献
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以SPOT 5及ETM 遥感影像为基础数据,通过对云南昆明郊区利用PCA法和Brovey法进行影像融合,使融合后影像同时具有多光谱特性和高分辨率,提高影像的解译度。并对融合后的影像进行分类及精度分析,讨论影像融合技术在土地调查中的应用。 相似文献
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基于HIS变换和WT变换的遥感影像融合 总被引：2，自引：0，他引：2
遥感影像信息融合是近年来国际遥感领域的研究热点.传统的遥感影像融合主要是HIS变换法、加权平均法、PCA法等.利用小渡变换(WT)技术进行遥感影像融合是近年来的研究热点,但其直接舍弃了全色图像的低频率分量,在结果图像中容易出现分块效应.本文结合HIS变换和小波变换的互补性,提出了一种基于HIS变换和小波变换的遥感影像融合方法.通过实验、直观和定性分析,新方法既可以增强融合影像的空间细节表现能力,同时也很好地保留了多光谱影像的光谱信息. 相似文献
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以南京市天绘一号卫星影像为实验数据,运用IHS变换、Brovey变换、Wavelet变换、PCA、Pansharp等遥感影像融合方法对其全色和多光谱影像进行融合,并对5种方法的融合结果进行了定性和定量分析。实验结果表明,IHS变换法和Pansharp法能显著增强融合影像的光谱信息,提高融合影像的空间分辨率。 相似文献
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多时相、不同空间分辨率遥感图像数据融合能较大幅度提高融合图像的解像力,在遥感影像解译中一种好的融合方法可以提高影像的质量,从而提升影像的解译结果。本文以隆昌县为试验区,采用Brovey、PCA、HIS和Gram-Schmidt 4种融合方法对试验区ETM+影像的高空间分辨率Pan波段和多光谱432波段进行融合。通过平均值、标准差、平均梯度、信息熵、相关系数和扭曲程度对这些融合方法进行评价。评价结果表明4种融合方法都能不同程度的改善影像质量,其中Brovey融合法光谱失真度小,清晰度和空间分辨率较高,影像所含信息量丰富,更适合于隆昌ETM+影像的融合处理。 相似文献
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针对三维环境下地质灾害遥感解译成果制图需借助第三方软件,难以自动实现的问题,介绍了基于三维GIS平台iTelluro(网图)的地质灾害遥感解译成果的自动成图方法.以遥感解译专题图制图规范为依据,根据用户选择的比例尺和制图范围,从影像数据库和三维GIS图层中自动获取遥感影像图层、矢量图层、地质地理图层和解译专题图层数据,设置专题地图的渲染样式,并在基于iTelluro的地质灾害三维遥感解译系统上实现了该方法.该方法提高了地质灾害遥感解译成果的制图效率,可及时为地质灾害防治与应急提供信息产品. 相似文献
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南极是地球上对全球气候变化最敏感、响应最迅速的区域之一,针对南极冰盖变化的监测对很多领域有着十分重要的意义。本文针对南极区域选取MODIS与Land—sat ETM＋两种遥感影像,通过ENVI遥感平台,利用包括WAVELET变换法、PCA变换法、BROVEY变换法和HPF变换法等4种影像方法进行融合,并选择均值、标准差、偏差指数、相关系数等评价指标,对融合后的影像进行评价。得出结论：ETM＋影像WAVELET算法融合效果最好,而对于Modis影像PCA算法融合效果最好,两种卫星影像对不同尺度的监测都有着各自的优势。 相似文献
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《测量评论》2013,45(18):241-242
AbstractIn working out vertical heights on the Akuse-Kete Krachi chain of triangulation in the Gold Coast a fairly considerable difference was found between values of the coefficient of refraction obtained from observations taken during the day and those taken at night, the mean values being 0.069 for daylight observations to heliographs and 0.087 for night observations to lamps. This difference no doubt is due mainly to the condition of the atmosphere during the day differing from its condition during the night rather than to any effect due to different sources of light. A new chain has recently been observed in Western Ashanti, and the index of refraction for the daylight observations again gave a lower value than that obtained from the night observations, the figures being 0.073 and 0.099 respectively. For the night work three different sources of light were used, hurricane lamps for short lines, Tilley vapour-pressure lamps for lines of intermediate length, and McCaw acetylene signalling lamps by Watts for long lines. It occurred, therefore, to the writer to examine the results to see if the mean values of the index of refraction showed any variations for the different light sources, since it seemed reasonable to suppose that the constitution of the light emitted from each source would be different and hence that the coefficient of refraction might vary. 相似文献
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A. A. Lyutyy 《地理信息系统科学与遥感》2013,50(2):127-139
The author continues development of his concept of cartography as the “language of the map,” an earlier paper of this subject appearing in translation in M.S.R.S., 1985, No. 1. Although the term language has been widely used to describe cartographic communication, current theory fails to incorporate aspects of the language which provide for a comprehensive understanding of its structure and function. In particular, the language of the map and its symbolic elements cannot be explained reflexively by methods and rules of symbol and map design, since these elements were developed not before but after the existence of the language. The language of the map thus is proposed as the mechanism which provides for replicability or duplication in the way a system of mapmaking-map use functions (under diverse conditions, purposes, historical periods, and levels of training of users) through its different methods, models, and norms. Translated from: Geografiya i prirodnyye resursy, 1985, No. 3, pp. 142-151. 相似文献
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M. J. Miles 《The Photogrammetric Record》1968,6(32):196-201
The theory of the solution of the stereogram is developed from the condition that the vector triangle, formed by the base-line and the two rays from the perspective centre to a common model point, shall be in equilibrium. Using this approach the unique definition of a point in the model follows naturally from the solution of the relative orientation problem. 相似文献
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《测量评论》2013,45(91):206-210
AbstractThe observations to height Kilimanjaro were made from two ground stations, Domberg (5,081·6 ft.) and Lelatema (5,323.1 ft.) and from a point called Kibo near Kaiser Wilhelm Spitze which is regarded as the highest point on the crater rim. It was originally intended to include a third ground station, Kifaru, but it was discovered that the ice cap obstructed observations between this point and the top. 相似文献
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利用卫星测高资料推求西北太平洋海域的海洋大地水准面 总被引：3，自引：0，他引：3
本文根据卫星测高数据和海面动力地形资料，绘制了不相上下北太平洋海域局部大地水准面的精细结构图，对解决卫星测高技术中大地水准面积和海面地形的可分性问题作了初步尝试。 相似文献
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《测量评论》2013,45(23):16-20
AbstractThis paper is written primarily with the object of ascertaining how other Colonies and Dominions deal. with the adjustment of their trigonometricallevels; further, since the greater part of Nigeria is now covered by a framework of levels of primary accuracy it is of interest to examine the results. Moreover, the evaluation of the coefficient of refraction, and from it the temperature lapse-rate, is of some importance in view of the recent publication of the War Office Aneroid Tables. These tables are based on a standard lapse-rate of temperature. 相似文献
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《测量评论》2013,45(37):429-436
AbstractGauss's method of collimation is usually given scant attention in survey text-books. The following notes are based on experiments carried out at Accra in making a collimation base, the collimator being a Watts 2I-inch self-adjusting level fitted with a parallelplate micrometer. 相似文献
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