A new kernel method for hyperspectral image feature extraction     

Bin Zhao  Wenzhi Liao  Bing Zhang 《地球空间信息科学学报》2017,20(4):309-318

Abstract

Hyperspectral image provides abundant spectral information for remote discrimination of subtle differences in ground covers. However, the increasing spectral dimensions, as well as the information redundancy, make the analysis and interpretation of hyperspectral images a challenge. Feature extraction is a very important step for hyperspectral image processing. Feature extraction methods aim at reducing the dimension of data, while preserving as much information as possible. Particularly, nonlinear feature extraction methods (e.g. kernel minimum noise fraction (KMNF) transformation) have been reported to benefit many applications of hyperspectral remote sensing, due to their good preservation of high-order structures of the original data. However, conventional KMNF or its extensions have some limitations on noise fraction estimation during the feature extraction, and this leads to poor performances for post-applications. This paper proposes a novel nonlinear feature extraction method for hyperspectral images. Instead of estimating noise fraction by the nearest neighborhood information (within a sliding window), the proposed method explores the use of image segmentation. The approach benefits both noise fraction estimation and information preservation, and enables a significant improvement for classification. Experimental results on two real hyperspectral images demonstrate the efficiency of the proposed method. Compared to conventional KMNF, the improvements of the method on two hyperspectral image classification are 8 and 11%. This nonlinear feature extraction method can be also applied to other disciplines where high-dimensional data analysis is required.  相似文献   

基于环境一号卫星遥感数据的南京市市区湖泊信息提取研究     

李冬辉  韩易 《测绘与空间地理信息》2017,(6):139-141

环境一号卫星系统是专门用于环境和灾害监测的,对地观测系统由两颗光学卫星HJ-1A和HJ-1B组成,拥有光学、红外、超光谱多种探测手段,具有大范围、全天候、动态的环境和灾害监测能力。本文以南京的环境一号卫星影像为例,运用归一化差异水体指数法提取并分析了南京市市区湖泊分布信息,得到了较为满意的结果。  相似文献   

基于物方空间几何约束最小二乘匹配的建筑物半自动提取方法   总被引：8，自引：0，他引：8  

张祖勋  张剑清  胡翔云 《武汉大学学报(信息科学版)》2001,26(4):290-295

提出了一种从数字航空立体像对半自动提取建筑物的方法。操作员通过人机界面选择房屋的种类并输入初始位置，然后经过边缘检测、直线段提取和据此房屋几何模型的线段自动编组等处理得到各房屋角点的初始位置，最后，为了获得房屋的精确定位和符合物方严格几何约束的结果，基于物方空间几何约束的最小二乘匹配平差模型用于求取房屋直线边缘和物方几何模型的最优匹配，试验表明，该方法能提高建筑物的提取精度并可为半自动建筑物提取提供一个灵活的框架。  相似文献   

基于ER Mapper的水土流失地形因子提取技术初探     

刘新华 《四川测绘》2001,24(1):10-12

介绍了新一代图像处理系统ER Mapper及其应用，分析了不同空间尺度下影响水土流失的地形因子，针对ER Mapper的图像处理功能，对地形因子的提取技术进行了初步探讨，并取得了一定的成果。  相似文献   

预测发震时间的水氡滑动变化率值及其检验   总被引：2，自引：0，他引：2  

范雪芳  王吉易 《地震》2001,21(1):85-90

介绍了水氡滑动变化率的计算公式，滑动变化率的演化与地震时间的统计关系，据此给出了水氡滑动变化率值发震时间预测的步骤、判断指标和方法。结合震例，对预测效能进行了评价。检验性预测结果表明，预测的发震期限为1－12个月，平均5．1个月。该方法可以用于强震中短期预报。  相似文献   

地震图纸数字化及数据库管理系统   总被引：7，自引：1，他引：7       下载免费PDF全文

刘政凯  王炜  张荣  俞能海  张天中  潘坚云 《地震学报》2001,23(3):314-324

介绍应用Delphi3开发的地震图纸数字化及数据库管理系统（SDDMS）．该系统功能齐全，可方便地完成地震图纸数字化、档案管理和数据分析全过程，使利用计算机分析处理历史上积累下来的地震图纸成为可能，对地震预报和地震科学研究十分有利．   相似文献   

唐山7.8级地震前后地下流体动态异常演化特征   总被引：6，自引：2，他引：6       下载免费PDF全文

邵永新  李君英  田山  李一兵 《地震工程学报》2001,23(1):26-29

以30口水动态及油井动态观测井1973年至1978年的观测资料为基础，对唐山7．8级地震前后水动态和油井动态异常的演化过程进行了分析研究，认为该次地震前后水动态演化过程可分为4个阶段。异常首先在震中区附近出现，然后异常区向外围区扩展，并呈现多点集中的特点。在中短期阶段异常明显向震中区收缩、迁移。在临震阶段在震中区附近形成高异常集中区。  相似文献   

Application of the Geo-Anomaly Unit Concept in Quantitative Delineation and Assessment of Gold Ore Targets in Western Shandong Uplift Terrain,Eastern China   总被引：1，自引：0，他引：1  

Chen  Yongqing  Zhao  Pengda  Chen  Jianguo  Liu  Jiping 《Natural Resources Research》2001,10(1):35-49

A number of large and giant ore deposits have been discovered within the relatively small areas of lithospheric structure anomalies, including various boundary zones of tectonic plates. The regions have become the well-known intercontinental ore-forming belts, such as the circum-Pacific gold–copper, copper–molybdenum, and tungsten–tin metallogenic belts. These belts are typical geological anomalous areas. An investigation into the hydrothermal ore deposits in different regions in the former Soviet Union illustrated that the geologic structures of ore fields of almost all major commercial deposits have distinct features compared with the neighboring areas. These areas with distinct features are defined as geo-anomalies. A geo-anomaly refers to such a geologic body or a combination of bodies that their composition, texture–structure, and genesis are significantly different from those of their surroundings. A geo-anomaly unit (GU) is an area containing distinct features that can be delineated with integrated ore-forming information using computer techniques on the basis of the geo-anomaly concept. Herein, the GU concept is illustrated by a case study of delineating the gold ore targets in the western Shandong uplift terrain, eastern China. It includes: (1) analyses of gold ore-forming factors; (2) compilation of normalized regional geochemical map and extraction of geochemical anomalies; (3) compilation of gravitational and aeromagnetic tectonic skeleton map and extraction of gravitational and aeromagnetic anomalies; (4) extraction of circular and linear anomalies from remote-sensing Landsat TM images; (5) establishment of a geo-anomaly conceptual model associated with known gold mineralization; (6) establishment of gold ore-forming favorability by computing techniques; and (7) delineation and assessment of ore-forming units. The units with high favorability are suggested as ore targets.  相似文献   

美国中西部沙山地区环境变化的遥感研究   总被引：18，自引：4，他引：18  

赵英时 《地理研究》2001,20(2):213-219

文章选择了典型半干旱地区———美国中西部的沙山为研究区,利用陆地卫星TM、MSS图像数据,采用线性光谱混合模型(LSMM)、穗帽变换、指数提取等方法,提取反映环境变化的沙地、湿地、水域、草地等信息,并研究典型半干旱地区———Nebraska近20年来的环境变化及其与气候变化的关系。  相似文献   

土壤水取样技术应用基础研究——土壤水提取量与土壤含水量关系   总被引：1，自引：0，他引：1       下载免费PDF全文

荆继红  韩双平 《地球学报》2001,22(4):380-383

土壤水取样技术在环境地质研究领域，特别是包气带污染质迁移，集聚研究，浅层地下水的污染预测与防治，盐渍土改良及农业生态研究等方面具有重要的应用价值。因而，以实验资料为依据。研究了土壤水取样技术某些重要应用基础问题，重点描述了土壤水取样器在4种不同岩性中的土壤水提取量与土壤含水量的关系，岩性中的土壤水提取量与土壤吸力的关系，并建立了相应的相关方程，以及对影响土壤水取样速率和取样量主要因素等问题进行了分析。  相似文献