火烧迹地信息遥感快速提取方法研究     

高中灵  汪小钦  周小成 《国土资源遥感》2005,(4):38-41,i0002

利用福建省福州地区ETM图像，在分析火烧迹地光谱特征的基础上，研究了火烧迹地信息遥感快速提取方法。文中设置了4种提取方案，即监督分类法、NDVI参与的监督分类法、NDVI差值法及谱间关系法，最后，对提取结果进行了精度评价。  相似文献   

多维分形奇异功率谱分析与应用          下载免费PDF全文

李庆谋;  ;  刘少华; 《地球物理学进展》2005,20(4)

地球物理信号中普遍含有噪声，消除噪声是地球物理信号处理中的关键技术之一.奇异功率谱分析（SSA）是在状态空间（又称相空间）中研究（系统）动力学、非线性科学与混沌现象的方法.本文在状态空间中通过SSA分解，研究、应用地球物理序列的尺度不变性进行多维分形滤波：通过在状态空间的SSA分解，构造了经验正交函数系（EOF）；在EOF子空间中定义了两种尺度与测度后，发现了两种测度与尺度皆在多个尺度范围内存在尺度不变性；利用这种尺度~测度的尺度不变性，设计、实现了多维分形奇异功率谱(MSSA)滤波模型；处理解释了大洋钻探（ODP）1143A孔岩芯自然反射性（NGR）资料；Fourier功率谱分析结果证明，MSSA能有效地压制噪声，提取有用信号.研究得出，嵌入维数对MSSA基本无影响（小于1/1000），多维分形滤波器（MSSA）能有效压制噪声或提取有用信号.  相似文献   

校园典型地物波谱特性数据库系统研究     

陈香菱  张振勇  董健  任朋飞 《国土资源信息化》2007,(6):23-24,25

通过对山东科技大学若干典型地物如植被、水体、岩石的波谱特征测定、波谱图像处理,获得了较详细的地物波谱数据。结合当前地物波谱的研究现状及成果,建立了一个便于查询山东科技大学地物波谱特性的数据库系统。同时研究了地物波谱的动态变化规律,为进一步遥感数据分类等应用提供基础数据,为学生进行遥感实验提供基础资料。  相似文献   

http://www.sciencedirect.com/science/article/pii/S1674987113000613     

Yangfan Deng  Zhongjie Zhang  Weiming Fan  Marta Perez-Gussinye 《地学前缘(英文版)》2014,5(2):193-203

The effective elastic thickness （Te） represents the thickness of the elastic layer or the flexural rigidity of the lithosphere, the equivalent of which can be calculated from the spectral analysis of gravity and topographic data. Studies of Te have profound influence on intracontinental deformation, and coupling of the tectonic blocks. In this paper, we use the multitaper spectral estimation method to calculate the coherence between Bouguer gravity and topography data, and to obtain the Te map of South China. Through the process of correction, we discuss the relationships of Te versus heat flow, and Te versus seismicity. The results show that Te distribution of South China is affected by three factors：the original age, which controls the basic feature;the Mesozoic evolution, which affects the Te distribution;and the neotectonic movement, which shaped the final distribution. The crust age has a positive correlation with the first-order Te distribution;thus the Yangtze Craton has a relatively higher Te （about 50 km） whereas the Te in Cathaysia block is only 10e20 km. By analysis and comparison among the tectonic models of South China, the Te distribution can be well explained using the flat-subduction model. As is typical with neotectonics, the region with a higher heat flow is related with a lower Te. The seismicity does not have a clear relationship with Te, but the strong seismicity could cause a low Te. Seismogenic layer （Ts） has a similar trend as Te in the craton, whereas in other areas the relationship is complex.  相似文献   

Observations of the temperature and polarization anisotropies with Boomerang 2003     

W.C. Jones  P.A.R. Ade  J.J. Bock  J.R. Bond  J. Borrill  A. Boscaleri  P. Cabella  C.R. Contaldi  B.P. Crill  P. de Bernardis  G. De Gasperis  A. de Oliveira-Costa  G. De Troia  G. Di Stefano  E. Hivon  A.H. Jaffe  T.S. Kisner  A.E. Lange  C.J. MacTavish  S. Masi  P.D. Mauskopf  A. Melchiorri  T.E. Montroy  P. Natoli  C.B. Netterfield  E. Pascale  F. Piacentini  D. Pogosyan  G. Polenta  S. Prunet  S. Ricciardi  G. Romeo  J.E. Ruhl  P. Santini  M. Tegmark  M. Veneziani  N. Vittorio   《New Astronomy Reviews》2006,50(11-12):945

The Boomerang experiment completed its final long duration balloon (LDB) flight over Antarctica in January 2003. The focal plane was upgraded to accommodate four sets of 145 GHz polarization sensitive bolometers (PSBs), identical to those to be flown on the Planck HFI instrument. Approximately, 195 hours of science observations were obtained during this flight, including 75 hours distributed over 1.84% of the sky and an additional 120 hours concentrated on a region covering 0.22% of the sky. We derive the angular power spectra of the cosmic microwave background (cmb) temperature and polarization anisotropies from these data. The temperature anisotropies are detected with high signal to noise on angular scales ranging from several degrees to 10 arcminutes. The curl-free (EE) component is detected at 4.8σ, and a two-sigma upper limit on the curl (BB) component of 8.6 μK² is obtained on scales corresponding to 0.5°. Both the temperature and polarization anisotropies are found to be consistent with a concordance ΛCDM cosmology that is seeded by adiabatic density perturbations. In addition to the cmb observations, Boomerang03 surveyed a 300 square degree region centered on the Galactic plane. These observations represent the first light for polarization sensitive bolometers, which are currently operational in two South-Pole based polarimeters, as well as Planck HFI, at frequencies ranging from 100 to 350 GHz (3 mm to 850 μm).  相似文献   

不同场地条件下的土层地震反应对比分析     

尹力峰  王坚  谭明  陈建波 《内陆地震》2007,21(4):297-303

选择新疆地区的地震动衰减关系,采用概率方法计算了位于同一构造区的两个场地(A场地和B场地)的地震危险性,两个场地以基岩峰值加速度为标志的场地地震危险性结果相近。通过现场勘察与检测,场地A与场地B均为岩性不同的两个一元结构,岩性分别以砂砾石和粉土为主。采用一维土层反应等效线性化的计算方法得出场地A和场地B的土层反应。通过地震反应谱的特征分析,表明硬场地和软场地的强度和周期(或频率)特征是不同的,同时讨论了它们测试与判定中存在的问题。  相似文献   

用T-矩阵法分析降水粒子在微波段下的Z_(DR)特性     

陈康  王庆安 《气象科学》2000,20(4)

本文采用Ｔ－矩阵方法从理论计算的角度分析了在Ｘ、Ｃ和Ｓ波段下不同轴比、大小和相态的扁椭球降水粒子的差反射率因子ＺＤＲ,对为三种波长的双线偏振雷达实际运用提出了更合理的解释,得到若干有用的结论。文中还对Ｔ－矩阵方法的准确性进行地评价。  相似文献