Identifying geospatial services across heterogeneous taxonomies

Geospatial services with different functions are assembled together to solve complex problems. Different taxonomies are developed to categorize these services into classes. As differences in granularity and semantics exist among these taxonomies, the identification of services across different taxonomies has become a challenge. In this paper, an approach to identify geospatial services across heterogeneous taxonomies is proposed. Using formal concept analysis, existing heterogeneous taxonomies are decomposed into semantic factors and their various combinations. With these semantic factors, a super taxonomy is established to integrate the original heterogeneous taxonomies. Finally, with the super taxonomy as a cross-referencing system, geospatial services with classes in original taxonomies are identifiable across taxonomies. Experiments in service registries and a social media-based spatial-temporal analysis project are presented to illustrate the effectiveness of this approach.     

Evaluating urban public facilities of Shenzhen by application of open source data

Abstract

This article applies open source data of public facilities through data mining, not only to evaluate the public facilities from an objective dimension, but also to reflect the sensory opinions of the group factually, eventually realizing the evaluation measurement of urban public facilities. The research takes Shenzhen city as an empirical case and chooses typical public facilities to mine data, resolve address and weight to explore the application of public facilities evaluation under dimension reduction of open source data. The empirical study consists of three parts. First, as the objective evaluation, we estimate the density distribution and per capita of public facility through data mining and address resolution. Second, as the subjective evaluation, we carry on the location analysis to high-score public facility through attention and satisfaction data of Internet evaluation. Finally, as mentioned above, we calculate the weight of objective and subjective evaluation of public facility, eventually formatting the comprehensive evaluation of public facilities.     

测量机器人的关键技术

本文提出了测量机器人概念,重点分析了测量机器人的组成框架及关键技术,聚焦定位与建图、场景感知、路径规划及多机协同等测量机器人前沿研究领域,综述了最新研究进展,并剖析了当前面临的技术难题,简述了测量机器人的发展机遇.     

基于多源遥感数据的森林火灾监测研究

以2019年5月13日黑龙江省佳木斯市同江市洪河国家级自然保护区为研究对象,基于静止气象卫星Himawari-8(H8)和极轨气象卫星MODIS数据对火灾发生经过进行还原,基于高分一号(GF-1)和高分六号(GF-6)数据进行火烧迹地识别.试验结果表明,Himawari-8及MODIS数据都可较好地反演出火灾发生地点,...     

油气管道纵断数据自动提取技术研究

作为管道工程勘测设计中的一项重要工作,纵断面测量内业数据处理具有工作量大、自动化水平低的特点,极大地影响了工作效率.针对此问题,本文设计了油气管道纵断数据提取程序,实现油气管道中线高程点加密、基于机载LiDAR点云数据的纵断数据提取、里程和角度计算等功能,并应用在实际工作当中.该系统具有易操作、高精度、高效率等优势,大...     

"大地测量学基础"课程教学改革的实践

从普通教学型院校测绘教学及测绘市场技术要求出发,针对“大地测量学基础”的课程特点,对教学内容、教学方法及教学手段进行探索与实践,分析多项保证教学质量的改革措施,达到增强教学效果和提高教学质量的目的,论述培养测绘创新人才的诱发、引导、歇留、展现的教学思想,阐述了实际教学全过程的反思,提出了未来教学的有效计划与合理化建议。     

干旱区地下水位降幅空间分布特性研究

基于GIS和地理统计学的理论、方法对所取观测井地下水位降幅数据进行空间分布特征分析。结果表明:数据服从正态分布,结构符合球状模型,空间数据存在东西方向和南北方向的二价函数趋势;地下水位降幅由北向南呈环状递减,最深降幅达30m,绿洲群大部分居于20～30m降幅之间,为地下水开采密集区,大于10m降幅的面积约69300hm2。利用Kriging最优内插法生成等值线图,可以更准确和直观地展示整个研究区的地下水资源状况、生态环境可能发生退化的区域及未来发展方向。     

空间测边交会的解法、精度估算和最佳图形探讨

本文介绍空间测边交会的三种解法。利用矩阵迹的性质,巧妙推出了实用的精度估算式,并由此得出空间测边交会的最佳图形为交会角皆是90°的四面体的结论。     

An intelligent agent based on virtual geographic environment system

On the basis of previous work, this paper designs an intelligent agent based on virtual geographic environment (VGE) system that is characterized by huge data, rapid computation, multi-user, multi-thread and intelligence and issues challenges to traditional GIS models and algorithms. The new advances in software and hardware technology lay a reliable basis for system design, development and application.     

Implementation of OGC web map service based on web service

OGC Web Map Service is one kind of OGC Portrayal Services belongs to OGC Web Service model and it provides multi-platform interoperability of spatial data set. This paper presents a method for implementing OGC Web Map Service based on Web Service technique and introduces the detailed process.