三维GIS在陕西省高速公路管理中的应用设计     

程一曼  李舸  李翼 《测绘与空间地理信息》2014,(12)

应用三维GIS技术建立高速公路综合管理平台,将高速公路地理信息和其路产设施信息相结合,以三维可视化场景实现高速公路景观及信息的浏览查询、三维可视化漫游、检索和动态交互管理.基于三维GIS高速公路管理平台实现路网管理、交通监控、养护、路政等计算机辅助决策,提高了高速公路的管理水平,为最终实现高速公路运营的全数字化管理奠定了坚实的基础.  相似文献   

基于CorelDRAW的地图注记自动化配置方法研究     

房雪玲 《测绘与空间地理信息》2014,(11)

作为制图者与用图者间信息传递的桥梁,地图注记辅助地图符号,对制图要素的名称、种类、性质和数量特征等进行了标识和说明,是地图不可或缺的组成部分。曲线、文字编辑功能极强的CorelDRAW软件颇受制图人员青睐,尤其在注记配置工作中扮演着重要角色。文章从点、线、面三个角度对地图注记配置进行了理论探析,同时基于CorelDRAW 15．0 Type Library控件和VBA环境进行了二次开发,智能化地实现了点注记的四点定位、线注记的适合路径、封闭面域的构建和自定义面注记的添加,对提高地图制图的效率和美化图面效果具有十分重要的意义。  相似文献   

结合ASIFT和归一化的抗仿射变换遥感影像盲水印算法     

秦如贞  张黎明  伍庭晨  李玉  王昊 《地球信息科学学报》2021,23(10):1882-1891

针对遥感影像使用过程中,含水印影像经过仿射变换后水印与影像的同步性被破坏,导致水印无法正常检测的问题,本文提出了一种适用于遥感影像的抗仿射变换盲水印算法。首先通过ASIFT算法提取影像具有仿射不变性的特征点,根据特征尺度的大小与特征点间的欧式距离筛选适量特征点,构造对应的正方形特征区域;然后通过计算特征区域的仿射不变矩得出归一化变换函数的参数,对特征区域进行归一化处理,并以归一化特征区域的不变质心为中心提取子区域作为水印嵌入区域,对该区域进行二级离散小波变换,得到水印嵌入区域的低频信息;运用量化嵌入规则将水印嵌入到低频信息中,依次进行低频信息逆小波变换,水印嵌入前后特征区域差值图像反归一化,最后将反归一化差值图像叠加在原始影像特征区域上,完成水印的嵌入。实验选用了3000像素×3000像素的高分二号遥感影像作为载体影像,含版权信息的二值图像作为水印,实验表明：含水印的遥感影像经过旋转、平移、缩放在内的仿射变换后,仍能准确提取水印信息;算法可有效抵抗加噪、滤波、裁剪等常规水印攻击,攻击后影像提取的水印与原水印相关系数均高于0.9;水印具有良好不可感知性;在水印提取时无需原始遥感影像,属于盲水印算法。  相似文献   

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刘峡  傅容珊  郑勇  黄建平  张祖胜  孙东平 《大地测量与地球动力学》2007,27(3):6-11

????????й?????????????????????????????????????????????????????????????????????????μ??й?????α? ?????GPS???????????????????????????????:??????????????????10???????й????????????????????????10??GPS?????????????????????;?????????????????????:??????????????????????????,??????????????????????????????????????,??????????????????????黡???????????????????????????,?????????????????????????????????????????????:1)?й?????????????????????????????????????????????????????????????????????????????;2)?Щ????????????????????????????????????й??????????????????  相似文献   

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蒋锋云  王双绪  张希  张晓亮  薛富平  郑申宝  王继英 《大地测量与地球动力学》2007,27(4):21-30

??1999~2001??2001~2004????????????????嶫???GPS?????????вο?????任??????????????????????????????????????????????????????????????????????????????????????????????????????????????α??λ?????????????????????????任?ο???????????????????????????????????????????????????????????????????????????????????????????????????仯?????????????????????????  相似文献   

Carrying Capacity of Marine Region in Liaoning Province   总被引：1，自引：1，他引：1  

DI Qianbin  HAN Zenglin  LIU Guichun  CHANG Hongwei 《中国地理科学(英文版)》2007,17(3):229-235

Carrying capacity is one of important studies on coordinating development of population,resources,and environment.At present,the researches on it mainly concentrate on the carrying capacity for population and economy,such as the water resources carrying capacity,the land resources carrying capacity,the environment carrying capacity,etc.Based on the related theories and methods,this paper creatively proposed the concept and meaning of carrying capacity of marine region,and formed the appraisal system.According to the developing situation of marine economy of Liaoning Province in recent years,and by employing the method of the state space,this paper also measured the carrying capacity and carrying state of marine region and discussed the sustainable problems of marine economy of Liaoning.The research results show that the carrying state of marine region of Liaoning is in the state of overloading at present,but taking a favorable turn.  相似文献   

基于HVCE-RBFNN的矿区地表三维形变监测研究     

周文韬  张文君  缪骏懿  申锐  訾应昆 《大地测量与地球动力学》2022,42(5):520-525

提出一种融合赫尔默特方差分量估计和径向基函数神经网络(HVCE-RBFNN)的三维形变计算方法,结合GNSS和InSAR监测数据,解算甘肃省金昌市金川西二采矿区的地表三维形变场。结果表明,基于HVCE-RBFNN方法获取的三维形变结果精度高于传统方法,其东西向、南北向和垂直向的均方根误差(RMSE)分别为20.85 mm、7.41 mm和34.47 mm,3个方向的最大形变量分别为228 mm、300 mm和193 mm,采空区形变空间分布符合开采沉陷规律。  相似文献   

基于手绘图件的考古遗址三维建模方法     

林冰仙  周良辰  盛业华  闾国年 《地球信息科学学报》2014,(3):349-357

考古遗址是研究古代人类活动的重要场所。重建考古遗址三维模型对于历史回溯、古环境恢复和古迹保护等考古工作均具有重要的意义。传统考古发掘过程中普遍采用的手绘图件难以实现考古现场环境的模拟与再现,也不能准确地反映出遗址中文化层与其所包含地物的空间关系。近年来,考古学家引入各类勘察新技术用于考古文化层与遗迹的三维建模,但这些方法无法应用于已完成发掘工作的遗址三维重建。针对这一问题,本文提出一种以考古发掘过程中普遍采用的手绘图件为数据源的考古遗址三维建模方法。该方法以探方为基本建模单元,将考古文化层与遗迹分开建模,利用探方分布图及探方图建立考古文化层三维模型,利用遗迹图建立考古遗迹三维模型,并以三维实体布尔运算方法,将两者无缝整合,构建完整的田野考古遗址三维模型。最后,以湖南澧县八十垱东区为研究区,验证了本文相关研究成果的有效性与实用性。实践证明,该方法能够充分利用传统考古过程中积累的大量资料,有助于将传统考古学在宏观尺度下的定性描述转化为现代"数字考古"中微观尺度的定量描述。  相似文献   

Aquifer heterogeneity determination through the slope method     

Zekai Şen  Essam Wagdani 《水文研究》2008,22(12):1788-1795

In arid‐region wadis, groundwater storage lies within shallow Quaternary alluvium deposits, which are connected with the present‐day hydrological cycle and, therefore, are replenished due to occasional runoff and flash flood occurrences. The groundwater resources are precious in these environments; therefore, their potentiality must be assessed with care in the best manner. The aquifer potentiality is calculated after the storativity and transmissivity parameter estimations, which require rather long‐duration field tests with restrictive assumptions in the theoretical model developments, such as the homogeneity and isotropy. It is the main purpose of this paper to expose the fundamentals of the slope‐matching procedure (SMP) and its application for short‐duration field tests in arid‐region aquifers. In this manner, the subsurface hydrogeological behaviours of the bored land pieces at and around the well locations are prospected in a detailed and refined manner. It is shown that in many cases the classical techniques are appropriate, inconvenient and inapplicable with conclusive reliable results and conclusions. The application of the SMP is presented for some aquifer tests from the central western part of the Kingdom of Saudi Arabia. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献   

Investigation on strength and stability of jointed rock mass using three‐dimensional numerical manifold method     

L. He  X. M. An  X. B. Zhao  Z. Y. Zhao 《国际地质力学数值与分析法杂志》2013,37(14):2348-2366

This paper proposes a numerical model for jointed rock masses within the 3‐D numerical manifold method (NMM) framework equipped with a customized contact algorithm. The strength of rock sample containing a few sets of discontinuities is first investigated. The results of models with simple geometries are compared with the available analytical solutions to verify the developed computer code, whereas models with complex geometries are simulated to better understand the fundamental behavior and failure mechanism of jointed rock mass. Furthermore, the stability of jointed rock mass in an underground excavation is studied, where rock failure process is determined by the 3‐D NMM simulation. The simulation results provide valuable guidance on excavation process design and stabilization design in rock engineering practice. Copyright © 2012 John Wiley & Sons, Ltd.  相似文献