Island instantaneous coastline extraction based on the characteristics of regional statistics of multispectral remote sensing image

本研究采用IkOnOS遥感图像,选取波谱特征区,通过区域像元统计并计算各波段权重系数,将影像进行波谱归一化处理,使归一化的影像岛陆与海水特征更明显。在此基础上,采用最大类间方差法确定最佳分割阈值,对归一化的影像进行二值化,从而提取海岛岸线。该方法采用特征曲线法进行水陆分离,得到的二值图像保持了原图的有效边缘,采用二值形态学提取的海岸线连续可靠、信噪比高。结果表明,该方法简单、快速,能有效提取海岸线,具有实用价值。This study adopted IKONOS remote sensing images and selected spectral characteristic areas, through regional pixel statistics and calculating weight coefficients of each band, processed the images with the spectral normalized method, which made the features of islands, land and water features more obviously in the images.On this basis, the OTUS was used to determine the optimal segmentation threshold, and the normalization image binarization was made, thus the island coastline was extracted.This method used the characteristic curve method to separate the land and water, obtained the binarization images and maintained the original edge effectively.The coastline that was extracted by Binary Morphology was continuous, reliable and high signal-to-noise ratio.The results showed that this method could extract the coastline fast, simply and effectively, which had the practical value

Analysis on the land use and cover change in Tianjin Binhai New Area based on the remote sensing

采用全国土地分类系统,基于lAndSAT卫星TM遥感影像与天津滨海新区1:50,000地形图,进行相应数据处理,编制出2000年、2005年、2010年三期滨海新区土地利用/覆盖分类图,并运用土地利用转移矩阵对近10年来天津滨海新区土地利用/覆盖变化进行定量分析。在此基础上,进一步分析了经济、人口等驱动因子对土地利用/土地覆盖的影响。结果表明:十年间,滨海新区的建筑用地面积增加显著,而绿地、湿地、滩涂等高生态价值的土地向建筑用地、未利用地等开发建设用地大幅度转化,后五年变化尤为显著。This paper carries out quantitative analysis on the land use/cover(LU/C) change of Tianjin Binhai New Area in recent 10 years through using land use transition matrix from the three-stage LU/C classification maps of 2000, 2005 and 2010 drafted by means of the National Land Classification System of China based on Landsat TM satellite remote sensing image and the Tianjin Binhai New Area 1:50 000 relief maps.On this basis, the impact of such driving factors as the economy and population on LU/C is further analyzed.The results show that the area of the building land in Binhai New Area has increased significantly over the ten years, and the greenland, wetland, and shoals of high ecological value have been dramatically transformed into the building land and unused land for the development and construction, and the change is more significant in the later five years

基于CFD/CSD耦合的导弹舵面颤振数值研究

导弹弹身的存在对舵面附近的流场起到了重要的影响作用,单纯的翼面颤振并不能直接模拟导弹舵面的颤振情况。本文在基于CFD/CSD耦合的基础上,采用紧耦合的耦合方式、基于RBF插值的网格变形方法和基于虚功原理的气动载荷交换方法,以AGARD445.6机翼为研究对象,研究了AGARD445.6机翼作为导弹舵面的颤振特性,并对比单独AGARD445.6机翼的颤振特性,结果表明弹身对舵面的颤振特性呈现出复杂的影响规律,并且在亚声速和跨声速会有明显的不同。同时本文研究了导弹舵面在弹身的不同安装位置对颤振特性的影响,为舵面安装位置提供理论依据

几何不确定性区间分析及鲁棒气动优化设计

不确定性因素会导致飞行器偏离预先设计的气动性能，造成气动性能下降甚至产生严重的后果。针对工程中无法给出准确的几何不确定性概率分布以及跨声速条件下非线性气动问题，对几何不确定性的非概率参数化建模进行了研究，并结合Kriging代理模型及最优化方法建立了快速非线性区间分析方法。采用该方法对对称翼型进行不确定性分析，获得了气动性能参数的定量变化区间。在区间不确定性分析基础上建立了鲁棒优化设计流程。基于区间序关系及区间可能度转换模型将单目标区间不确定性优化问题转化为多目标确定性优化问题，并采用基于Pareto熵的自适应多目标粒子群优化算法对优化问题进行寻优。考虑几何不确定性以及升力、力矩、面积约束，以阻力性能为目标对超临界翼型进行了鲁棒优化设计，与确定性优化设计结果对比表明考虑不确定性时，可得到综合鲁棒性更优的翼型

Analysis on land use and cover change based on the remote sensing in Tianjin Binhai New Area

采用全国土地分类系统,基于lAndSAT卫星TM遥感影像与天津滨海新区1∶50 000地形图,进行相应数据处理,编制出2000年、2005年、2010年三期滨海新区土地利用/覆盖分类图,并运用土地利用转移矩阵对近10年来天津滨海新区土地利用/覆盖变化进行定量分析。在此基础上,进一步分析了经济、人口等驱动因子对土地利用/土地覆盖的影响。结果表明:10年间,滨海新区的建筑用地面积增加显著,而绿地、湿地、滩涂等高生态价值的土地向建筑用地、未利用地等开发建设用地大幅度转化,后5年变化尤为显著。Using the National Land Classification System and based on Landsat TM satellite remote sensing image and the Tianjin Binhai New Area 1 ∶ 50 000 relief maps,three stages(2000,2005 and 2010) of land use/cover classification maps for Binhai New Area were drafted,and using the transition matrix of land use for nearly 10 years of land use/cover change in Tianjin Binhai New Area,the quantitative analysis was made.On this basis,the impacts of driving factors,such as economy and population on the land use/cover were further analyzed.The results showed that :over the ten years,in Binhai New Area,the construction land's area increased significantly,and the green land,wetland and beaches with high ecological value increasingly transformed into the construction land and unused land for development and construction,and it became more significant in later five years.国家海岛保护与管理专项(1511310700072