共查询到20条相似文献，搜索用时 781 毫秒
1.
海洋一号C卫星（HY-1C）搭载的海岸带成像仪（coastal zone imager,CZI）为满足大幅宽成像需求,采用双相机组合成像,每台相间使用2片4色电荷耦合光敏元器件（charge-coupled device,CCD）拼接。从严密几何成像模型出发,对相机成像过程中存在的系统误差进行分析,采用一种基于探元指向角的几何定标模型,并结合CZI相机设计特点与几何特性,设计出一套针对HY-1C/CZI的几何定标方案。首先利用CZI参考基准波段影像与高精度参考影像进行绝对几何定标,采用分步迭代的方法对参考基准波段影像内外定标参数进行解算,其次进行波段间相对几何定标,最后得到所有波段影像的几何定标结果。实验结果表明,经在轨几何定标后,平面无控定位精度优于5个像元,影像几何质量得到明显改善,说明所采用的定标模型和方案合理有效。 相似文献
2.
传统的非量测相机检校方法大多依赖于高精度的室内或室外控制场,并对检校环境有较严格的要求。故提出了一种完全抛开控制点的新的相机检校方法,即线面角制约的相机迭代检校法。将该方法分别应用于陆地和水下环境,并与有控制点的相机迭代检校法进行对比分析,试验结果表明新方法的检校精度均小于1个像素,在陆地环境下,新方法的检校精度优于有控制点的相机迭代检校法。同时利用新方法进行了水下三维重建和量测,量测精度达到亚毫米级。试验结果表明新方法具有较好的灵活性和适应性,在多个环境下具有实际应用的价值。 相似文献
3.
4.
5.
6.
7.
8.
三维激光点云数据具有精度高、数据获取高效、几何信息丰富的优势,在地形数据获取方面起到了越来越重要的作用。但在实际的外业测量中,由于视场角限制,一般都难以获取待测物体完整的点云数据,发生数据缺失现象。而根据摄影测量技术生成密集的影像点云,能获取复杂区域的测量数据。针对三维激光点云数据外业采集缺失的状况,结合影像密集点云特征,提出了一种加入动态迭代因子和分步最优求解尺度的改进尺度迭代最近点(scaling iterative closest point, SICP)算法,对影像点云与三维激光点云进行配准研究。实验结果表明:基于改进的SICP算法提高了影像点云与三维激光点云的配准精度、减少了迭代次数,能有效解决不同源平台获取的点云数据融合问题。 相似文献
9.
10.
提出了一种改进的Curvelet变换的融合算法,以IKONOS影像为样本数据,融合过程中将原全色波段与多光谱影像中未参与HIS分解的波段进行加权组合,形成新全色分量,再将此分量与明度分量分别进行第二代Curvelet变换,以形成新明度分量,HIS逆变换后形成融合影像。并与改进的HIS变换融合、传统的HIS变换与Curvelet变换结合的融合算法相比较,结果表明,改进的方法能增加融合影像的信息量,降低光谱扭曲度,提高融合影像与原多光谱影像的相似度。 相似文献
11.
营口市位于辽宁省的中南部,面对渤海的辽东湾,背依鞍山市平原丘陵,东邻辽东崇山峻岭,西接盘锦市沿海平原,有辽河蜿蜒人海,海岸线绵延曲折。由于受海洋、河流的影响．营口市四季分明,气候宜人,蕴藏着丰富的滨海旅游资源,海蚀景观、地质珍迹、人文景观等资源各显异彩;尤其是海水浴场,条件极为优越,与国际上一流的海水浴场相比．毫不逊色,在某些特征上还稍胜一筹。 相似文献
12.
A. P. Tolstosheev 《Physical Oceanography》2009,19(6):358-365
A method for the estimation of the results of reconstruction of the trajectories of drifting buoys is proposed. It is based
on the comparison of the estimates of power spectral densities for the components of current velocity computed according to
three data sets: the data set of the coordinates of a drifting buoy with a built-in GPS receiver, the data set of coordinates formed on the basis of the first set but with data missing and observational errors
corresponding to the actual trajectory measurements by the Argos satellite location and data collection system by the Doppler method, and the data set of coordinates obtained as a result
of interpolation of the second set. As an example, we consider the procedure of realization of the proposed method and demonstrate
the efficiency of its application for the improvement of the reliability of reconstruction of the trajectories of drifting
buoys. 相似文献
13.
An attempt has been made to estimate the fishery potentials of the EEZ of India on the basis of data on primary and secondary production. The total column primary production and zooplankton production have been calculated to be 265·9 and 9 million tonnes of carbon per year, respectively. From these values the fishery potential has been estimated as 2·5 million tonnes per year. To this, if we add the estimated demersal fish catch, being 1·2 million tonnes per year, the total potential yield comes to 3·7 million tonnes per year. Since the present average total catch is about 1·6 million tonnes in a year, the fish catch could be doubled. 相似文献
14.
1992年，联合国21世纪议程提出了综合管理的概念，并认为它是海岸管理的最重要目标，而海岸管理的目的就是改进业已存在的管理实践的效率和效果。在21世纪议程的实施过程中，沿海国家面临着巨大的困难，即：为了使综合管理在实践中具有可操作性而建立适合的政府机构。韩国正是在国家范围和次一级区域进行这项工作的实验场所。这项工作的最重要成就是在1996年成立了具有综合协调各涉海部门职能的韩国海洋事务与渔业部（MOMAF）。这篇文章的内容主要来自于这些观察，即韩国政府为建立海岸带综合机制而进行了各种努力，特别是1992年联合国环发大会召开后到1997年初海洋事务与渔业部成立了海岸带管理处这段时间里开展的各种工作，文章重点在于评价在建立海岸带综合机制的过程中综合的概念是如何被应用并被挑战的。文章提出了在东亚地区沿海国家开展合作的可能区域的建议。 相似文献
15.
天然气水合物地球化学特征 总被引：4，自引：0，他引：4
天然气水合物是在低温、高压以及有足够气体供应条件下形成的一种天然气(主要为甲烷)与水组成的似冰状固态化合物。天然气水合物中包含的甲烷碳是全球甲烷资源的重要组成部分,是一种数量巨大的潜在能源[1]。而且由于甲烷的温室效应,天然气水合物分解释放的甲烷进入大气中会严重 相似文献
16.
17.
18.
I. E. Timchenko A. A. Primalenny V. D. Yarin E. F. Vasechkina E. M. Igumnova 《Physical Oceanography》2001,11(4):367-378
We use many-year archival observations of hydrologic and hydrobiologic state of the Sea of Azov for the identification of
the structure of a model of its ecosystem. The ecosystem model, supplemented with expert estimates of bioresource consumption
(fish reserve), contamination level, and possible ecologic fines for violation of the sea natural state, is formalized by
the method of system dynamics. Hereat, the major part of influence functions is found in terms of observational data with
application of self-organization algorithms. We also present the results of simulated experiments with the model of the ecosystem,
which enable us to analyse scenarios of its behaviour under the influence of various external factors (wind, river discharge,
water exchange with the Black Sea, etc.).
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献
19.
Values of root mean square slope 0 and its variations -0 are estimated using the brightness field of an image of the surface of the sea near a speck of light. When 0 and -0 are defined it is highly important to take into account direct as well as dissipated solar radiation.The space-time analysis of the structure of the image brightness field is performed. This gives an opportunity to estimate dispersion relationship and the running effect of a brightness contrast packet. Comparison of the parameters obtained with the theoretical dispersion ratio of internal waves (IW) allows one to make a conclusion that IW surface manifestations are recorded in a frame.UDK 551.463.5 相似文献
20.
Yu. D. Chashechkin 《Physical Oceanography》2011,20(5):317-324
The methods of perturbation theory and integral representations are used to analyze the general properties of a system of
equations of the mechanics of inhomogeneous fluids including the equations of momentum, mass, and temperature transfer. We
also consider various submodels of this system, including the reduced systems in which some kinetic coefficients are equal
to zero and degenerate systems in which the variations of density or some other variables are neglected. We analyze both regularly
perturbed and singularly perturbed solutions of the system. In the case of reduction or degeneration of solutions, the order
of the system decreases. In this case, regularly perturbed solutions are preserved (with certain modifications) but the number
of singularly perturbed components participating in the formation of the boundary layers on contact surfaces and their analogs
in the bulk of the fluid, i.e., the elongated high-gradient interlayers, decreases. The interaction between all components
of the currents is nonlinear, despite the fact that their characteristic scales are different. 相似文献