Quantifying geological structures of the Nigde province in central Anatolia,Turkey using SRTM DEM data   总被引：1，自引：0，他引：1  

A. C. Demirkesen 《Environmental Geology》2009,56(5):865-875

A digital terrain model and a 3D fly-through model of the Nigde province in central Anatolia, Turkey were generated and quantitatively analyzed employing the shuttle radar topographic mission (SRTM) digital elevation model (DEM). Besides, stream drainage patterns, lineaments and structural–geological features were extracted and analyzed. In the process of analyzing and interpreting the DEM for landforms, criteria such as color and color tones (attributes of heights), topography (shaded DEM and 3D fly-through model) and stream drainage patterns were employed to acquire geo-information about the land, such as hydrologic, geomorphologic, topographic and tectonic structures. In this study, the SRTM DEM data of the study region were experimentally used for both DEM classification and quantitative analysis of the digital terrain model. The results of the DEM classification are: (1) low plain including the plains of Bor and Altunhisar (20.7%); (2) high plain including the Misli (Konakli) plain (28.8%); (3) plateau plain including the Melendiz (Ciftlik) plateau plain (1.0%); (4) mountain including the Nigde massif (33.3%); and (5) high mountain (16.2%). High mountain areas include a caldera complex of Mt Melendiz, Mt Hasan and Mt Pozanti apart from the Ala mountains called Aladaglar and the Bolkar mountains called Bolkarlar in the study region (7,312 km²). Analysis of both the stream drainage patterns and the lineaments revealed that the Nigde province has a valley zone called Karasu valley zone (KVZ) or Nigde valley zone (NVZ), where settlements and agricultural plains, particularly the Bor plain in addition to settlements of the Bor town and the central city of Nigde have the most flooding risk when a heavy raining occurs. The study revealed that the NVZ diagonally divides the study region roughly into two equal parts, heading from northeast to southwest. According to the map created in this study, the right side of the NVZ has more mountainous area, where the Aladaglar is a wildlife national park consisting of many species of fauna and flora whereas the left side of the NVZ has more agricultural plain, with exception of a caldera complex of Mt Melendiz and volcanic Mt Hasan. The south of the study region includes the Bolkarlar. In addition, the Ecemis fault zone (EFZ) lying along the Ecemis rivulet, running from north to south at the west side of the Aladaglar, forms the most important and sensitive location in the region in terms of the tectonics.  相似文献   

基于MapGIS的地质图数字化误差来源和对策   总被引：1，自引：0，他引：1  

方杰  徐芬  何虎军  李煜航  魏翔 《地下水》2009,31(2):120-121

误差的减小要从数字化的各个环节入手,从数字化的一开始就要控制,重点是减少源误差和避免误差的传播.结合具体实例,利用数字化流程对各个环节进行分析,查出了主要的4个误差来源,并提出数字化前误差减少与数字化中误差减少的具体方法.  相似文献   

关于建设数字郑东新区的构想   总被引：4，自引：0，他引：4  

王家耀  张震宇  武洪涛 《地域研究与开发》2004,23(2):88-91

郑东新区是一个新规划的城区,在城市建设的同时进行信息化建设将比其它城市具有更大的优势和发展机遇。文章探讨了数字郑东新区的总体框架、空间基础设施、标准体系建设,以及在信息化建设中的重点电子工程。并提出了加强组织体系建设、制订信息化战略、加强信息安全保障、完善融资体系等保障措施。  相似文献   

基于遥感和GIS的区域生态环境分类研究   总被引：4，自引：2，他引：2  

田雨  林宗坚  李成名  乔平林 《测绘科学》2004,29(1):26-28

本文以石羊河流域为例,研究了基于卫星遥感数据与数字高程模型的区域生态环境分类方法。其研究 机理是:利用遥感技术获取相关生态环境专题信息,运用GIS空间分析技术自动生成流域范围的生态环境边界, 形成了一种科学的区域生态环境分类方法。  相似文献   

Instrumental and digital coronagraphy for the observation of the Uranus satellites’ upcoming mutual events     

M. Assafin  R.P. Campos  D.N. da Silva Neto  A.H. Andrei 《Planetary and Space Science》2008,56(14):1882-1887

Ground-based observations of faint satellites nearby their planets with 1-2 m class telescopes usually do not allow for high quality astrometry and photometry, due to saturation by the primary or to poor S/N ratio on the satellite images, generally embedded on the scattered light of the planet. Earth-based observations of the Uranus satellites’ upcoming mutual events in 2007-2008 are no exception. In most cases, the event will take place at 4 arcs or less from the planet, with “planet minus satellite” brightness differences of 10 magnitudes. So as to make feasible the observations of these important phenomena, we have developed a prototype of a coronagraph of simple design making use of good quality commercial optical systems. Pilot tests made with this coronagraph with a telescope of show that it is possible to obtain S/N ratios of 50 or higher for 10 s exposures, for satellites as close as 2 Uranus radii from the planet center. We have also developed numerical algorithms which perform digital coronagraphy in the images, with the elimination of the influence of the planets’ scattered light. This procedure considerably improves the S/N ratio of the satellite images (with or without a coronagraph instrument) and shall be applied in the reduction of the observations of the Uranus events so as to achieve the highest possible photometric and astrometric quality.  相似文献   

地震勘探时空域双曲滤波因子的特点与提高信噪比的能力   总被引：6，自引：2，他引：4       下载免费PDF全文

李月  杨宝俊  林红波  袁野  郝雪  刘晓华 《地球物理学报》2008,51(5):1557-1566

为改善强随机噪声背景中地震勘探资料信噪比（S/N）,提出了混沌振子算法;该算法可实现对未知同相轴的确定. 本文的时空域双曲滤波（hyperbolic time\|distance relation filter,HTDF）是上述算法的后续处理,即处理得到存在的弱同相轴.HTDF的理论基础是最小平方滤波和混沌振子算法. 为说明滤波过程与效果,对于包括一个反射同相轴的地震记录进行了多道滤波因子计算. 结果表明,与一个输出道相应的双曲滤波因子组具有复杂的时频域结构,突出的特点是振幅谱“波动式陷频”表现;弥补或消除这个不足的方法是与输出道相应的多个滤波因子之间存在的振幅谱“互补”性.利用相同随机噪声背景下的共炮点理论记录,经与域双曲速度滤波、褶积滤波处理方法比较,在振幅谱、子波初至、零相位性、S/N改善等方面,HTDF的滤波效果优于另外两种.最后探讨了该滤波技术的机理,包括同相轴内各子波间的相似性,以及对组内因子实施的多次有效相加处理.  相似文献   

High precision photogrammetry for monitoring the evolution of the NW flank of Stromboli volcano during and after the 2002–2003 eruption     

P. Baldi  M. Coltelli  M. Fabris  M. Marsella  P. Tommasi 《Bulletin of Volcanology》2008,70(6):703-715

  相似文献   

子区中位数衬值滤波法及弱小异常识别   总被引：15，自引：2，他引：13  

史长义  张金华  黄笑梅 《物探与化探》1999,23(4):250-257

提出一种新的数据处理方法---子区中位数衬值滤波法.该法采用子区模拟背景场的空间变异,以EDA技术计算异常临界值,用衬值为基准度量场值的起伏变化,较好地解决了弱小异常的识别问题.初步应用效果良好.  相似文献   

Terrain complexity and reduction of topographic data     

Yue-Hong Chou  Pin-Shuo Liu  Raymond J. Dezzani 《Journal of Geographical Systems》1999,1(2):179-198

Digital terrain data are useful for a variety of applications in mapping and spatial analysis. Most available terrain data are organized in a raster format, among them being the most extensively-used Digital Elevation Models (DEM) of the U.S. Geological Survey. A common problem with DEM for spatial analysis at the landscape scale is that the raster encoding of topography is subject to data redundancy and, as such, data volumes may become prohibitively large. To improve efficiency in both data storage and information processing, the redundancy of the terrain data must be minimized by eliminating unnecessary elements. To what extent a set of terrain data can be reduced for improving storage and processing efficiency depends on the complexity of the terrain. In general, data elements for simpler, smoother surfaces can be substantially reduced without losing critical topographic information. For complex terrains, more data elements should be retained if the topography is to be adequately represented. In this paper, we present a measure of terrain complexity based on the behavior of selected data elements in representing the characteristics of a surface. The index of terrain complexity is derived from an estimated parameter which denotes the relationship between terrain representation (percentage surface representation) and relative data volume (percentage DEM elements). The index can be used to assess the required volume of topographic data and determine the appropriate level of data reduction. Two quadrangles of distinct topographic characteristics were examined to illustrate the efficacy of the developed methodology.  相似文献   

数字摄影测量生产辅助系统的开发与应用     

王朗月 《测绘与空间地理信息》1999,22(4):19-20

结合作者在生产过程中开发数字摄影测量辅助系统的经验,对开发数字摄影测量辅助系统的目标、原则、注意事项以及目前该系统的功能等进行了参考性介绍,并根据生产应用的经验,对开发数字产品生产辅助系统的重要性提出了自己的观点。  相似文献