共查询到19条相似文献，搜索用时 156 毫秒
1.
一、数字城市的概念 目前，数字城市研究风起云涌，虽然对数字城市还没有一个严格准确的定义，但对其都有共性的认识。首先，数字城市以现实城市为基准，是对物质城市的数字模拟和仿真。其次，数字化城市以空间信息技术、虚拟现实技术为基础，以地理信息系统为平台。再次，数字城市具有智能化、网络化的特点。 相似文献
2.
3.
4.
5.
《广东海洋大学学报》2021,(4)
【目的】探究海洋生态适宜性的评价方法,为优化海域开发利用空间、保护海洋生态环境和促进沿海社会经济可持续发展提供重要参考基准。【方法】建立以层次分析法和德尔菲法为基础的海域开发利用生态适宜性评价指标体系,给出了指标权重,并以青岛近岸海域为例,利用地理信息系统(GIS),综合评价了青岛市近岸海域开发利用的生态适宜性程度。【结果】青岛近岸部分海域的生境质量较差,生态脆弱性指数较高,海域开发利用的生态适宜性较低。【结论】结合规划约束限制条件,得出生态适宜性程度不同的空间分布,为优化青岛海洋空间规划提供技术支撑。 相似文献
6.
VR-GIS技术在城市“数字防洪”中的应用 总被引：7，自引：1，他引：6
虚拟现实地理信息系统(VR-GIS)是一门综合虚拟现实和地理信息系统特征的新型技术,以此为基础构建的城市数字防洪系统在防洪决策中发挥了积极的辅助作用。本文以哈尔滨城区段三维数字防洪系统的开发为背景,探讨了VR-GIS应用于城市数字防洪的关键技术及其实现方法,包括防洪三维虚拟场景的构建技术,仿真数据库的建立与联合查询,洪水动态模拟等方面的相关技术和实现方法,为数字防洪系统提供了基础研究平台。 相似文献
7.
8.
海洋功能区划管理信息系统 总被引：5，自引：0，他引：5
海洋开发利用和保护已成为全球的热点。如何合理地利用海洋资源是未来社会经济可持续发展的重大问题。海洋功能区划是为实现海洋资源、社会经济可持续发展的重要举措。海洋功能区划管理信息系统是在地理信息系统的支持下,以海洋功能区划数据、基础地理数据和遥感数据为地理实体对象,集知识、分析、决策和服务为一体的系统。该系统从应用角度为空间数据管理和信息共享提供了一种可行的解决方案。本文以福建省海洋功能区划管理信息系统的建设为例,对系统的总体结构、功能、数据库和系统集成等方面进行了探讨。 相似文献
9.
马智民 《地球科学与环境学报》1996,(2)
数字正射像片（ｄｉｇｉｔａｌｏｒｔｈｏｐｈｔｏｓ）以其迅速、快捷的生产方式和详实、可靠的信息数据特性可以作为地理信息系统的一种新的信息源。本文论述了数字正射像片在地理信息系统中的应用，首次在矢量数据和栅格数据混合数据结构的图形工作站上，对数字正射像片应用于地理信息系统的原理、方法和数据流程进行了尝试。 相似文献
10.
《地球信息科学学报》2006,8(4):147-148
第1期《地球信息科学》创刊10年——编辑部的承诺和期望…(1)·地球信息科学论坛地球信息科学的新天地……………………………陈述彭(3)多云多雨环境遥感研究与应用分析………………………………林珲,邵芸,杨立民(7)中国数字海洋构建基准与关键技术………………………苏奋振,杜 相似文献
11.
GPU accelerated marine data visualization method 总被引：1，自引：0，他引：1
The study of marine data visualization is of great value. Marine data, due to its large scale, random variation and multiresolution in nature, are hard to be visualized and analyzed. Nowadays, constructing an ocean model and visualizing model results have become some of the most important research topics of ‘Digital Ocean'. In this paper, a spherical ray casting method is developed to improve the traditional ray-casting algorithm and to make efficient use of GPUs. Aiming at the ocean current data, a 3D view-dependent line integral convolution method is used, in which the spatial frequency is adapted according to the distance from a camera. The study is based on a 3D virtual reality and visualization engine, namely the VV-Ocean. Some interactive operations are also provided to highlight the interesting structures and the characteristics of volumetric data. Finally, the marine data gathered in the East China Sea are displayed and analyzed. The results show that the method meets the requirements of real-time and interactive rendering. 相似文献
12.
This study focuses on China's coastal area and its marine economic development. Applying the information diffusion method, the study establishes a kernel density function and its decomposition using a marine economic per capita as the index of the model to depict the dynamic evolution law and the internal influential factors of the Chinese marine economy during 1996–2013. The relative development rate was introduced to analyze the spatial differences in the marine economy's development. In this way, space and time dimensions fully characterized the evolution of the Chinese marine economy. Additionally, the influence of growth and inequality in the process of its development can be analyzed. The study shows that the Chinese marine economy as a whole has been growing, and regional marine economic development is relatively coordinated. In addition, the marine economy began to develop even more rapidly after 2004. There are three factors affecting the dynamic evolution of China's marine economy: first, the most influential mean effect, followed by, second, the variance effect, and third, the least influential residual effect. The biggest influence on the dynamic evolution of the marine economy is the improvement of the development level of the marine economy in the coastal area. Meanwhile, due to the existence of inequality, provinces at higher development levels are more dispersed. Furthermore, the existence of the residual effect weakens the influence of the mean effect, and the influence on the dynamic evolution of the marine economy continuously increases. In the analysis of the influencing factors of the evolution and spatial difference of marine economic development, the level of opening to the outside world, the level of investment in fixed assets and the industrial structure have a positive role in promoting economic development. However, capital investment in scientific human research has a negative correlation with economic development, and does not pass the significant test. The difference in regional development levels and development speed is also very apparent; namely, the provinces with higher development levels generally displayed faster development speeds while those with lower development levels showed slower development speeds across the four periods analyzed. 相似文献
13.
海洋科学的前沿-“数字海洋” 总被引：9，自引：0，他引：9
本文所提出的“数字海洋”,系基于当前世界各国极为关注的“数字地球”发展前景 ,其事关我国海洋科学进入21世纪信息时代所面临的挑战和机遇。对此,从“数字地球”概念及其所涉及的新理论和高新技术 ,到中国“数字地球”中的“数字海洋”有待顺应发展,作了概述。同时 ,重点就“数字海洋”技术与目标和建设的设想等作了探讨。 相似文献
14.
15.
数字地球是当前网络G IS领域的研究与开发热点之一,其中,大量的空间数据在空间数据库中的组织和存储,以及在网络上的传输是数字地球系统中的两个重要技术。本文通过"数字南海"的开发实践,从国家信息安全角度出发探讨了自主设计与研发空间关系数据库模型和网络传输协议的若干技术方法。提出了以面向对象的ORM源模型设计空间数据库概念模型,以擅长语义表达的IDEF1X模型设计空间数据库逻辑模型和以关系数据库实现空间数据库存储模型的技术方案。并运用异步非阻塞套接字和多线程等技术在TCP/IP网络传输协议上,设计并实现了空间数据应用传输协议,使得空间数据在数字地球的客户端三维显示系统与服务器端的空间数据服务器系统之间能够高效安全地传输,实现Google Earth类似的操作功能,包括空间数据的流式传输和渐进式传输等,适应了数字地球的要求,并保证了空间数据的安全性,可为我国数字地球系统的自主开发与研制提供参考和借鉴。 相似文献
16.
The concentrations of natural radionuclide210Po in various components of the marine organisms of North China coastal waters are described and its contribution to the radiation
exposure of marine organisms and man are estimated. Data on its concentrations in different species show that, in general,
its concentration in crustaceans and molluses is higher than that in fish, where its concentrations in liver and gut are much
higher than that in bone and muscle. An estimation of the dose to marine organisms and man due to exposure to210Po is very necessary for any assessment of the impacts of man-made radionuclides from coastal nuclear power installations. 相似文献
17.
以Google Earth为代表的第一代数字地球平台,利用球面剖分瓦片,构建了2.5维静态的数字地球表面,实现了地表空间数据的集成、建模和应用,但没有涉及地表上下的空间。本文阐述了球体大圆弧QTM八叉树剖分的规则、瓦块体系的几何特征及其编码原理,设计并实现了瓦块编码到空间直角坐标之间的互换算法,并利用C++和OSG等主流语言,构建了真三维数字地球可视化平台的雏形框架;实现了球面和球体的任意剖分、地表上下空间实体的可视化建模及简单三维空间分析。初步展示了球体瓦块的新一代数字平台在天地一体化空间大数据集成、管理、建模与应用中的优势及前景。研究表明,球体大圆弧QTM八叉树网格,具有简单、规整、几何特征明晰、适宜作为全球离散空间的坐标基准,利于空间实体建模与可视化等特点,可作为构建新一代数字地球平台的数据模型基础。 相似文献
18.
通过对滨州近海海域海底沉积物测试数据及海岸带陆域土壤地球化学分析,对滨州海岸带陆域土壤和海底沉积物中7种重金属(Hg,Cd,Pb,Cu,Zn,Cr,Ni)的空间分布特征进行了研究,并绘制了各指标含量陆海联合分区图。分析结果表明,滨州市海岸带重金属元素含量基本上均低于国标规定的海洋一类沉积物的最高标准,仅有个别元素含量超过一级标准值,表明局部存在一定的重金属污染。从滨州海岸带重金属含量空间分布上来看,除Hg元素外,其余重金属元素含量呈现一定的规律,基本上陆域含量高于海域含量,且大部分元素都呈现出陆域城镇值高,郊区值低的态势。区内化工企业较发达,Ni,Cr属于中度变异区,Cd,Hg,Pb属于高度变异,受人为影响因素较大,考虑区内土壤及海底沉积物重金属富集主要来源于工业"三废"。 相似文献
19.
High frequency ground wave radar (HFGWR) has unique advantage in the survey of dynamical factors, such as sea surface current, sea wave, and sea surface wind in marine conditions in coastal sea area. Compared to marine satellite remote sensing, it involves lower cost, has higher measuring accuracy and spatial resolution and sampling frequency. High frequency ground wave radar is a new land based remote sensing instrument with superior vision and greater application potentials. This paper reviews the development history and application status of high frequency wave radar, introduces its remote-sensing principle and method to inverse offshore fluid, and wave and wind field. Based on the author's "863 Project", this paper recounts comparison and verification of radar remote-sensing value, the physical calibration of radar-measured data and methods to control the quality of radar-sensing data. The authors discuss the precision of radar-sensing data's inversing on offshore fluid field and application of the assimilated data on assimilation. 相似文献