美国空间规划体系的构建及启示

本文在分析美国空间规划及体系形成的基础上,从规划的法规体系、行政体系和运行体系三个方面阐述各级规划的法规、机构及规划类型,总结美国空间规划体系的特点,得出对我国空间规划体系构建的启示.     

时空信息云平台技术在国土资源信息化中的应用探讨

本文介绍了时空信息云平台的建设内容,分析了其关键技术,并以徐州市智慧国土(一期)建设为例,探讨了时空信息云平台相关技术在国土资源信息化中的应用.时空信息云平台的实践对于构建国土资源信息化新的技术框架具有重要借鉴意义.     

A Comparative Study of Various Supervised Learning Approaches to Selective Omission in a Road Network

Selective omission is necessary for road network generalisation. This study investigates the use of supervised learning approaches for selective omission in a road network. To be specific, at first, the properties to measure the importance of a road in the network are viewed as input attributes, and the decision of such a road is retained or not at a specific scale is viewed as an output class; then, a number of samples with known input and output are used to train a classifier; finally, this classifier can be used to determine whether other roads to be retained or not. In this study, a total of nine supervised learning approaches, i.e., ID3, C4·5, CRT, Random Tree, support vector machine (SVM), naive Bayes (NB), K-nearest neighbour (KNN), multilayer perception (MP) and binary logistic regression (BLR), are applied to three road networks for selective omission. The performances of these approaches are evaluated by both quantitative assessment and visual inception. Results show that: (1) in most cases, these approaches are effective and their classification accuracy is between 70% and 90%; (2) most of these approaches have similar performances, and they do not have any statistically significant difference; (3) but sometimes, ID3 and BLR performs significantly better than NB and SVM; NB and KNN perform significantly worse than MP, SVM and BLR.     

一种Brovey变换图像融合法的改进算法

分析了的Brovey变换融合算法,提出了一种新的基于Brovey变换、对数变换亮度调整的图像融合方法,试验数据的对比和分析证明了其保留多光谱影像的光谱信息.     

地面移动测量技术的发展与现状

地面移动测量技术是当前倍受关注的测量前沿技术。本文论述了地面移动测量技术的基本原理和特点，回顾了该技术的发展历史，总结了国内外研究现状，展望了今后的发展趋势与应用前景，并对研究、发展和应用这一技术提出了建议。     

Galileo开放服务导航电文特点分析

介绍了Galileo系统开放服务接口控制文件中导航信号及电文的概况,并在如何满足导航电文中各种不同参数数据的时效性、如何缩短用户接收机导航数据接收时间、如何支持多系统互操作等方面对其特点进行了分析介绍。     

A Keystone Transform Without Interpolation for SAR Ground Moving-Target Imaging

Synthetic aperture radar (SAR) image formation for a ground moving target necessitates the compensation of the unknown target trajectory. The keystone transform has been employed to remove the linear component of the range migration for the moving target, where interpolation is required. In this letter, a realization of the keystone transform avoiding interpolation is presented. The kernel of this transform, i.e., the range-frequency-dependent azimuth time rescaling, is implemented using only complex multiplications and fast Fourier transforms based on the scaling principle, which has been successfully applied in the equalization of the space-variant range cell migration in SAR processing. In addition, the moving target is coarsely focused according to the SAR geometry and the platform velocity while exploiting the scaling principle. This preliminary focusing is helpful in the isolation of the moving target from ground clutter, so as to facilitate a more refined processing with respect to each mover. SAR raw data combined with simulated echoes of moving targets are utilized to validate the presented approach     

基于GIS的水污染源数据监理与查错系统

城市生活废水、工业污水已经成为城市市政管理的重点内容,查清城市排水管网和水污染源的情况,建立专业的排水管网地理信息系统将有利于城市发展。一直以来,数据质量是GIS建设的关键,通过一个基于GIS的可视化数据监理和查错系统,阐述系统的设计方案、监理流程和功能特点。结合广州市水污染源调查项目,对监理系统在实际工程中的重点、难点应用作了说明。     

电子海图最短距离航线自动生成的改进方法

针对航路二叉树方法绕行碍航区处理不完备、效率低等缺点,提出了最短距离航线自动生成的改进方法。通过复杂碍航区路径的递归搜索和碍航区绕行规则的优化,实现了复杂情形下的航线自动生成;利用方向一致性判断、边界检测和动态包络矩形排斥等策略优化航线生成,并采用递归处理和动态判断的方式求解最短距离航线。此方法与已有的航路二叉树方法相比,在自动生成航线的质量和效率上都有明显提高。     

Signal acquisition of Luojia-1A low earth orbit navigation augmentation system with software defined receiver

Low Earth Orbit (LEO) satellite navigation signal can be used as an opportunity signal in the case of a Global Navigation Satellite System (GNSS) outage, or as ...