Design of content-based retrieval system in remote sensing image database     

Li Feng  Zeng Zhiming  Hu Yanfeng  Fu Kun 《地球空间信息科学学报》2013,16(3):191-195

To retrieve the object region efficaciously from massive remote sensing image database, a model for content-based retrieval of remote sensing image is given according to the characters of remote sensing image application firstly, and then the algorithm adopted for feature extraction and multidimensional indexing, and relevance feedback by this model are analyzed in detail. Finally, the contents intending to be researched about this model are proposed.  相似文献   

Combined object-based classification and manual interpretation–synergies for a quantitative assessment of parcels and biotopes     

Stefan Lang  Elisabeth Schöpfer  Tobias Langanke 《国际地球制图》2013,28(2):99-114

Recent technical advances in remote sensing data capture and spatial resolution lead to a widening gap between increasing data availability on the one hand and insufficient methodology for semi-automated image data processing and interpretation on the other hand. At the interface of GIS and remote sensing, object-based image analysis methodologies are one possible approach to close this gap. With this, methods from either side are integrated to use both the capabilities of information extraction from image data and the power to perform spatial analysis on derived polygon data. However, dealing with image objects from various sources and in different scales implies combining data with inconsistent boundaries. A landscape interpretation support tool (LIST) is introduced which seeks to investigate and quantify spatial relationships among image objects stemming from different sources by using the concept of spatial coincidence. Moreover, considering different categories of object fate, LIST enables a change categorization for each polygon of a time series of classifications. The application of LIST is illustrated by two case-studies, using Landsat TM and ETM as well as CIR aerial photographs: the first showing how the tool is used to perform object quantification and change analysis; the latter demonstrating how superior aggregation capabilities of the human brain can be combined with the fine spatial segmentation and classification. Possible fields of application are identified and limitations of the approach are discussed.  相似文献   

Per-pixel and object-oriented classification methods for mapping urban land cover extraction using SPOT 5 imagery     

Mustafa Neamah Jebur  Helmi Zulhaidi Mohd Shafri  Mahyat Shafapour Tehrany 《国际地球制图》2013,28(7):792-806

To have sustainable management and proper decision-making, timely acquisition and analysis of surface features are necessary. Traditional pixel-based analysis is the popular way to extract different categories, but it is not comparable by the achievements that can be achieved through the object-based method that uses the additional characteristics of features in the process of classification. In this paper, three types of classification were used to classify SPOT 5 satellite image in mapping land cover; Support vector machine (SVM) pixel-based, SVM object-based and Decision Tree (DT) pixel-based classification. Normalised Difference Vegetation Index and the brightness value of two infrared bands (NIR and SWIR) were used in manually developed DT classification. The classification of the SVM (pixel based) was generated using the selected groups of pixels that represent the selected features. In addition, the SVM (object based) was implemented by using radial-based function kernel. The classified features were oil palm, rubber, urban area, soil, water and other vegetation. The study found that the overall classification of the DT was the lowest at 69.87% while those of SVM (pixel based) and SVM (object based) were 76.67 and 81.25%, respectively.  相似文献   

Morphometric Comparisons Between Rogen Terrain and Hummocky Terrain     

《自然地理学》2013,34(4):319-336

Visual interpretation of aerial photography suggests that certain geomorphological similarities exist between the hummocky terrain of central Alberta, Canada, and the Rogen terrain of Nunavut, Canada. This study statistically compares the two landform types based on measures of depression shapes and ridge orientations. Comparison of depression shapes indicates that two of three sample areas chosen from the hummocky terrain study area are statistically similar to those of the Rogen terrain study area. Analysis of ridge orientations indicates the ridge crests from two of three hummocky terrain sample areas, and ridge crests from within the Rogen terrain study site all exhibit a preferred trend. Variability in the process of formation may explain why only particular areas throughout the hummocky terrain exhibit patterns similar to the Rogen terrain and others do not. Statistical similarities in two-dimensional form between the hummocky terrain of central Alberta and the Rogen terrain of the Northwest Territories however, suggest that these landforms may have a common or similar origin.  相似文献   

Environmental “Education”: The Last Measure Of Man     

《The Professional geographer》2013,65(3):263-264

Promotion of nonacademic geography is a logical response to curtailment of opportunity for new teaching careers. Yet this necessary redirection of effort must be accompanied by renewed dedication to education and especially to nonprofessional undergraduate education. The case for geography in the liberal arts curriculum may well be a strong one, but questions about what we can offer need to be raised more frequently among ourselves if we are to respond effectively when such questions are asked by outsiders.  相似文献   

缅甸其培水电站恩梅开江断裂构造特征及活动性评价     

肖雄  王道永  周琳雄 《华北地震科学》2013,31(2):53-58

综合野外地质调查、氡气测量、石英形貌扫描(SEM)等资料,认为恩梅开江断裂中-晚元古代为一条韧性剪切带,但在喜马拉雅期发生了脆性变形,表现为一条由多条脆性断层叠加于韧性剪切带的断裂带。断裂新构造活动期主要集中在上新世到更新世。全新世以来活动性较弱,对水电站工程建设影响微弱。  相似文献   

矿液致裂作用对苗儿山矿田花岗岩型脉状铀矿床多期成矿的制约     

方适宜 《国外铀金地质》2012,(1):9-15,56

运用矿液致裂理论与多种测试技术,详细研究了桂北苗儿山矿田花岗岩型脉状铀矿床矿脉的形态与内部结构,获知成矿时矿液的压力大于围岩的静压力,矿脉由矿液压裂作用形成。在此基础上讨论了矿液致裂对花岗岩型脉状铀矿床多期成矿的控制。  相似文献   

中国铁矿资源现状与铁矿实物地质资料筛选   总被引：6，自引：0，他引：6  

崔立伟  夏浩东  王聪  易锦俊  孔令湖  陈佳 《地质与勘探》2012,48(5):894-905

依据我国铁矿资源的类型、成矿区（带）和赋存特点,概述了当前我国铁资源的状况,提出了铁矿资源进行实物地质资料筛选要考虑的因素。结果表明：中国铁矿床类型齐全,以沉积-变质型为主,岩浆型、接触交代-热液型次之;我国铁矿床成矿条件复杂,大型、超大型矿床少,贫矿多、富矿少,且伴（共）生有益组分多,但呈现相对集中分布的特点,主要包括鞍山-本溪、攀西-滇中、冀东-密云、长江中下游、鄂西-湘西北、邯郸-邢台等6个成矿区（带）,新疆地区铁矿资源潜力巨大,是未来找矿的重点;铁矿资源实物地质资料筛选应考虑铁矿床成矿规模、成因类型、成矿时代、成矿区（带）等因素,兼顾具有典型、潜力巨大的铁矿床作为筛选对象。  相似文献   

甘肃地质找矿突破的可行性分析 ——《甘肃省加强找矿３年突破行动方案（２０１２—２０１４）》解读     

张新虎  刘建宏 《甘肃地质》2012,(2):1-5

为实现甘肃省经济社会转型跨越发展,甘肃省政府下发了关于加强地质找矿工作的意见,出台了加强找矿3年突破行动方案。作为方案起草者,文章从地质找矿面临的形势和要求、甘肃矿产资源潜力分析等方面,就加强找矿3年突破行动计划作进一步解读,明确总体目标和任务,了解方案的运作机制,对国有地勘单位提出了推进地质找矿工作的新要求,即＂大规模大作为、高标准高质量、快节奏快发展＂,对全省资源领域、矿产资源勘查、开发工作具有指导意义。  相似文献   

涡轮钻具叶片型线设计及流场模拟分析研究          下载免费PDF全文

赵洪波  刘宝林  王建强  王瑜 《探矿工程》2012,39(11):29-32

涡轮叶片的型线设计对涡轮钻具的性能影响很大。以外径为127mm地质钻探用涡轮钻具为例,采用五次多项式来设计涡轮叶片的型线,使用SOLIDWORKS三维造型软件绘制了涡轮叶片的三维模型,并导入ANSYSFLOTRANCFD模块,对不同粘度下的涡轮叶片的水力性能进行了分析,获得了较为直观的速度场和压力场分布状况。结果证明,通过CFD分析,可以很好地将叶片型线的缺陷和不同状态下的涡轮钻具水力性能展现出来,对涡轮叶片的水力性能预测具有指导作用。  相似文献