Sarawut, Ninsawat

Osaka City University Repository

 
 
氏     名   NINSAWAT SARAWUT（ニンサワット サラウット） 
学 位 の 種 類   博士（創造都市） 
学 位 記 番 号   第 5364 号 
学位授与年月日   平成 21 年 3 月 24 日 
学位授与の要件   学位規則第４条第１項該当者 
学 位 論 文 名   Development of Web Service for Distributed Geoprocessing and Real-Time   
                    Sensor Observation using Free and Open Source Software 
                    フリーオープンソースソフトウェアを用いた分散型の空間解析およびリアル 
          タイムセンサーオブザベーションのためのウェブサービス 
論文審査委員   主 査 教授 ベンカテッシュ ラガワン  副主査 教授 中野 秀男            
          副主査 准教授 Xianfeng  SONG（中国科学院） 
 
 
論 文 内 容 の 要 旨 
Geoinformatics has played a key role at all levels of communities; especially since vast amounts 
of valuable geospatial data have become available. The near real-time utilization of geospatial 
data has been widely utilized in environmental monitoring, security management, disaster 
mitigation and so on. In order to fully utilize the available spatial data efficiently and 
time effectively, GIS has to play a critical role in not only disseminating the spatial data, 
but also by providing information and offering value-added service to potential users so as 
to support spatial decision making needs. Nowadays, the Web-GIS has very extensively developed 
and is being widely used as scores of Internet users are gaining exposure to spatial data for 
day-to-day needs. For most advanced usage, Web-GIS should include spatial analysis and spatial 
modeling capabilities for an on-demand GIS mapping. However, the essential data for accurate 
and up-to-date modeling of environmental situations also needs to be efficiently gathered. 
Real-time data acquisition and management is becoming more necessary to fulfill such needs.  
The present study proposes a comprehensive web-based GIS system enabled with spatial analysis 
functionality and coupled with real-time observation from remote field sites based on various 
open standards of OGC specifications. A distributed geoprocessing framework based on Web 
Processing Service (WPS) using real-time data as input parameters from Sensor Observation 
Service (SOS) has been newly implemented. Here, several different remote acquisition systems 
were successfully tested for compliance with standard web service framework. A prototype system 
for environmental monitoring for water quality has been developed to demonstrate the efficacy 
of integrating of several Open Web Services to develop a distributed data access and geospatial 
analysis system. Further, on-demand computation using Remote Sensing data has been 
demonstrated by implementing WPS for calculation of Sea Surface Temperature and Turbidity index 
map from ASTER image. The Remote Sensing data can be requested from distributed Web Coverage 
Services (WCS) following OGC compliant specification.  
Further, in order to promote easy understanding of analytical results, 3D geospatial data 
visualization within a web browser was implemented. In this research, the implemented system 
provide a novel solution offering a “browser-only” solution, wherein not only the existing 
static data; for example, the developed prototype system for 3D geologic modeling, can be 
visualized but also dynamic results offered through WPS can be accessed. The system is 
implemented under the multi-layer distributed web service architecture, which is based on a 
clearly demarcated Service Oriented Architecture (SOA) workflow. 
The present study will contribute to development of comprehensive analytical web-mapping 
application using a variety OGC services and facilitate gathering and processing real-time 
data from sensor networks with minimum human interaction. In addition, the prototype systems 
developed in this research are scalable, robust and well suited for distributed geospatial 
modeling. Apart from simple WPS implementation, the Web-GIS functionality could be enhanced 
based on service chaining and orchestration and execution of complex geoprocessing workflows 
using BPEL (Business Process Execution Language) engines. However, the actual implementation 
of service chaining would require development of middleware services due to existing 
incompatibilities between OGC web service and W3C standard web service. Such enhanced Web-GIS 
capabilities offer new opportunities for geoscientists to build applications for multi-layered 
dataset such as lifeline infrastructure, geological borehole data, geological maps, soil 
profiles, marine and atmospheric data. 
 
論 文 審 査 の 結 果 の 要 旨 
 
This thesis presents a new concept for Web-GIS using Open Standards and Open Geospatial 
Consortium Web Services (OWS). Based on this concept, a comprehensive Web-GIS framework for 
seamless sharing, distributed processing and visualization of both archived geospatial data 
as well as near real-time measurements derived from field sensors is proposed. The thesis also 
describes practical implementation of prototype Web-GIS systems that offer high degree of 
scalability, interoperability and customizability to cater to a variety of user needs. The 
prototype systems provide a clear demonstration on the efficacy of Free and Open Source Software 
(FOSS4G) to provide a framework to enable wider access and broader utilization of geospatial 
data. The proposed Web-GIS system is especially suitable for urban applications where 
information sharing and near real-time data processing is required for monitoring as well as 
decision making needs.  
 
Chapter 1 provides an overview of Web-GIS technology and presents the research objectives 
emerging needs for standardized geospatial services. 
Chapter 2 proposes an integrated OWS framework, enabling geospatial Data Sharing, 
Geo-processing and Visualization in distributed computing environment 
Chapter 3 outlines the implementation of service oriented Web-GIS environment using FOSS4G 
software stack and independently developed software solutions.  
Chapter 4 presents three prototype systems based on a clearly demarcated workflow comprising 
of data access, geo-processing and visualization services for on-demand spatial modeling using 
near real-time data from heterogeneous sensor network. 
Chapter 5 discusses the suitability of OWS based Web-GIS framework for environmental monitoring. 
It also proposes further enhancement such as mapping of geo-processing workflows as service 
chains. 
Chapter 6 summarizes the main conclusions of the research. 
 
The thesis defines a new Web-GIS framework based on careful evaluation of limitations in 
existing systems. Further, the results demonstrates a deep understanding of the underlying 
Open GIS Standards and expertise in implementing Open Source GIS Software solutions that have 
enabled the integration of several novel features within Web-GIS framework.  
 
The Web-GIS framework presented in the thesis offers a basis for building more complex 
applications using the emerging trends of service chaining and Web Service Orchestration. 
Further, innovative software development carried out, as a part of this research is an 
invaluable feedback to the FOSS4G community. 
 
In light of the above, the present thesis is evaluated to be of high caliber and as a significant 
contribution to Spatial Information Science as well as Environmental Science. Therefore, this 
the author of the thesis is conferred the degree of Doctor (Creative Cities). 


フリーオープンソースソフトウェアを用いた分散型の空間解析およびリアルタイムセンサーオブザベーションのためのウェブサービスの開発

http://dlisv03.media.osaka-cu.ac.jp/infolib/user_contents/youshi/5364.pdf

フリーオープンソースソフトウェアを用いた分散型の空間解析およびリアルタイムセンサーオブザベーションのためのウェブサービスの開発

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