传感器观测服务的性能评估与方法

传感器观测服务是传感网的核心服务,用于管理和获取异构传感器的元数据和观测数据.在一定的硬件和软件条件下,评估传感器观测服务的性能有助于发挥传感网监测目标地物时的最优性能.本文以服务性能的响应时间为评估标准,提出了传感器观测服务性能的评估方法.此方法分别从不同的操作和软件配置等方面进行了响应时间的评估,分析出传感器观测服务中不同操作的性能特征,提高了传感器观测服务的设计与部署效率.     

A Lightweight Approach for the Sensor Observation Service to Share Environmental Data across Europe

The importance of near real‐time access to environmental data has increased steadily over the last few years. In this article, the focus is on the European Environment Agency (EEA), which receives environmental data from a large number of providers. The heterogeneous data formats and data transfer mechanisms make the data collection and integration a difficult task for the EEA. An approach is needed for facilitating the interoperable exchange of environmental data on a large scale. A core element of this approach is the Sensor WebEnablement (SWE) technology of the Open Geospatial Consortium (OGC) which allows the standardized, interoperable, vendor and domain independent exchange of sensor data. The main contribution of this article is a lightweight profile for the OGC Sensor Observation Service that ensures the necessary interoperability for seamlessly integrating the environmental data provided by the EEA's member states and thus forms the foundation for the developed data exchange mechanisms. This is complemented by information about the resulting Sensor Web architecture and the integration into the EEA's existing IT infrastructure. In summary, this article describes a practical scenario in which SWE technology enables the exchange of near real‐time environmental data on a large scale.     

基于Web目录服务的地学传感器观测服务注册和搜索

在分布式异构网络环境下,如何根据时间、空间和尺度等因子发现地学传感器和聚集传感器观测数据已成为自适应地球观测和空间信息服务中需要解决的问题.本文提出集成OGC的目录服务和传感器观测服务的地学传感器数据的访问方法和体系架构,包含分布式地学观测服务、基于ebRIM的目录服务、SOS注册与搜索服务中间件和地学传感器门户4个部件;深入探讨了观测数据注册的流程、观测能力注册的更新、目录服务中海量历史观测数据的管理和可视化搜索等实现技术;最后,基于传感器观测服务和目录服务标准,设计和实现了服务注册原型,并用E0-1的高光谱观测数据验证了服务原型的可行性,能够有效解决传感器观测服务、观测能力和观测结果的注册、管理和搜索.     

一种构建标准电子海图网络服务的新方法

提出一种构建电子海图服务及前端应用的新方法,该方法利用WCF技术最大程度地继承了已有的电子海图成果,并通过四叉树键值实现金字塔瓦片参数与WMS参数的快速转换,使得该服务成为实用的标准电子海图网络服务。同时,利用Silverlight新技术,设计了栅格与矢量数据的统一渲染引擎,实现了多种前端富交互应用,并通过实验证明了该方法的实用性与有效性。     

Semantically Enriching an Open Source Sensor Observation Service Implementation for Accessing Heterogeneous Environmental Data Sources

Many kinds of environmental data are nowadays publicly available, but spread over the web. This article discusses using the Sensor Observation Service (SOS) standard of the Open Geospatial Consortium (OGC) as a common interface for providing data from heterogeneous sources which can be integrated to a user tailored environmental information system. In order to allow for providing user‐tailored and problem‐specific information the adjusted SOS is augmented by a semantic layer which maps the environmental information to ontology concepts. The necessary information fusion from different domains and data types lead to several specific requirements for the SOS. Addressing these requirements we have implemented a SOS which still conforms to the OGC SOS 1.0.0 standard specification. The developed SOS has been integrated in a publicly available demonstrator of our personalized environmental information system. Additionally this article discusses future consequences for the SOS, caused by the recently published SOS 2.0 specification.     

基于WINTAB标准的通用数字化仪接口程序编制

介绍了一种全新的通用数字化仪接口编制技术（WinTab)，该技术解决了由于不同厂商的数字化仪之间的不兼容性带来的接口程序编制问题，同时也在很大程度上降低了程序设计的复杂性。     

四川省标准地图服务体系建设研究

从标准地图编制的必要性出发,在参考国家及相关省份编制、发布标准地图的基础上,提出四川省标准地图服务体系的建设思路,明确地图版式、表示内容,通过建立四川省标准地图数据库,并引入基于OGC标准的地图服务发布方式,进一步完善现有标准地图服务体系,为各行各业更广泛、更便捷、更专业的应用标准地图提供基础与服务保障。     

公益性标准地图服务设计研究

针对我国标准地图服务中存在的不足,从服务公众和繁荣发展地图市场的角度出发,突破已有服务模式,调整扩充地图种类,变换地图表现形式,提出了公益性标准地图服务的设计思路,其将为广大用户提供更加现势化、人性化、专业化的服务,为我国下一步标准地图服务升级提供参考。     

地理空间传感网融合服务技术与应用

感知覆盖和网络通信对传感器网络监测的准确性、全面性以及数据传输具有重要意义。针对连续立体空间中传感器节点部署问题,提出了一种基于三维有限控制集的节点部署方法。首先采用一定的离散化尺寸将连续立体空间离散化,提取出一组可以代表连续空间中无限侯选位置的三维有限控制集;然后基于三维有限控制集构建考虑通信的最大覆盖模型。水下空间是一种典型的连续立体空间,一些水质监测变量在水下空间存在垂直方向的差异性,以水质监测为例,进行水下节点部署仿真,对空间离散化造成的误差进行分析,对比该方法和其他方法的覆盖效果。结果表明,提出的立体空间中节点部署方法可以有效部署节点,利用较少的节点达到较高的覆盖度,并且在部署节点数目较少的时候,仍可以保证节点之间的通信。

     

The Spatial Data Transfer Standard: A Catalyst for Change

The Spatial Data Transfer Standard (SOTS), as a standard, is somewhat of a paradox. Standards help to establish order and promote stability. As such, SDTS serves both as a standard and a catalyst for change. Beyond being the first major geographic information systems(GIS) standard, SOTS has invoked—and continues to invoke—significant changes throughout federal organizations and other' organizations that interact with them. The changes inspired by SDTS focus attention on the importance of GIS standards. This importance, in turn, is the underlying force in creating a GIS standards infrastructure. The infrastructure provides a mechanism/process for developing, approving, and coordinating GIS standards in the federal, national, and international communities.     

IHO海洋测绘地理空间数据新标准分析与思考

IHO海洋测绘地理空间数据新标准S-100是海洋测绘地理空间数据新的国际标准,其重要性不言而喻.然而由于该标准出现时间不长,并且抽象难以理解,为此,在深入学习ISO 19100系列标准、IHO相关标准的基础上,对S-100进行了分析总结.首先指出了S-57存在的问题,分析了S-100的主要优点;对S-100标准中涉及但...     

一种新的布设沉降观测点的方法

一些构筑物,不能按常规方法埋设观测点,介绍一种新的布设沉降观测点的方法一粘合观测点法,并通过工程实践,对新观测点稳固性进行了统计、分析。     

提高基础地理信息服务水平方法研究

基础地理数据库的建设适应了各行业应用的需要,随着应用需求的不断深入,网络技术的不断发展,GISWeb服务已成为改变基础地理信息服务的重要手段之一,本文论述了现有基础地理数据库服务的形式及存在的问题并采用GIS Web服务对基础地理数据库的提出了要求。     

Progress and challenges in the architecture and service pattern of Earth Observation Sensor Web for Digital Earth

The Earth Observation (EO) Web is the data acquisition and processing network for digital Earth. The EO Web including Data Web and Sensor Web has become one of the most important aspects of the Digital Earth 2020. This paper summarised the history of the development and status quo of the major types of EO data web service systems, including architecture, service pattern and standards. The concepts, development and implementation of the EO Sensor Web were reviewed. Furthermore, we analysed the requirements on the architecture of the next-generation EO Sensor Web system, namely Spaceborne-Airborne-Ground integrated Intelligent EO Sensor Web system, and highlighted the virtualization, intelligent, pervasive and active development tendency of such system.     

基于MSD标准框架实现制图环境下的地图服务资源调用

采用MSD标准框架下的接口方式,将包含坐标信息的制图环境和包含属性信息的地图服务资源进行一体化整合。利用该技术实现的系统已经应用于日常的城市规划设计服务中,且具有一定的推广价值。     

数字化城市管理新模式标准体系建设

随着体制改革的加快、越来越多的高新技术手段的应用,建立和实施新的技术标准体系迫在眉睫。在管理体制的变革进程中,旧有的管理模式、作业流程、技术标准被修改或破除,而新体制下的管理模式、作业流程、作业标准体系又亟待建立和实施。特别是数字化城管对数字化技术的依赖程度非常高．如果没有各项标准作为前提．也无法发挥作用。因此．数字化城市管理系统的开发、推广和应用是以标准体系的建立为前提的,没有各个阶段相应的标准规范,数字化城管新模式将寸步难行。