Transcript NASA ARC Project
CA-OES CAL(IT)2 Feb. 20, 2002
Internet GIServices
From Centralized Systems to Distributed Services
Ming-Hsiang Tsou
Email: [email protected]
phone: 619-5940205 Fax: 619-5944938
Department of Geography, San Diego State University
Why Internet GIServices?
Flexible Information Access / Exchange
(End-Users only need a Web browser)
Information Sharing and Integration
(Access multiple Internet Map Servers at the same time – Local governments, USGS, EPA, Census, etc.)
Real-time Information Update and Distribution
Gather data from client sides (polices, firefighters), Distribute updated data from server sides (control centers)
Internet Map Server
Three-Tie Architecture http://map.sdsu.edu
Client (Web browser) + Java applets Internet Map Server ArcIMS Web Server map.sdsu.edu
Internet Client (Web browser) + IMS Viewer Client (Web browser) Regional Database (GIS)
Three Types of Internet GIServices
Data Warehouse
(Catalog & Metadata)
Interactive Internet Mapping Facilities
(Internet Map Servers)
Real-time Analytical Tools
for GIS modeling and analysis applications. (wide fire spreading model, flooding area prediction,)
Key Technologies
Internet Map Server
(ESRI’s ArcIMS, AutoDesk’s MapGuide, INTEGRAPH’s GeoMedia Web Map, SmallWorld’s Internet Application Servers, etc.)
Java Programming
(cross-platform: Java applets and Java Servlets)
XML (Extensible Markup Language)
for metadata and communication with Internet Map Servers (ArcIMS – ArcXML).
ESRI ArcIMS: http://maps.esri.com/ AutoDesk MapGuide: http://usa.autodesk.com/adsk/in dex/0,,939407-123112,00.html
GeoMedia Web Map http://www.intergraph.com/gis/ customers/default.asp
Internet Mapping Software Comparisons http://map.sdsu.edu/software-demo.htm
Problems for Internet GIS packages
•
Heterogeneous Geospatial Data Formats
• ArcIMS: Shapefiles and Images • MapGuide: Spatial Data Files (SDFs) • GeoMedia Web Map: ActiveCGM •
Security and Upgradeability
• Access control, password protection, Intranet solution • Upgrade from 100 clients to 1000 clients.
•
Customizable Interfaces and functions
• require advanced programming efforts.
• lack of on-line GIS operations and modeling functions.
NASA ARC project:
Web-based GIS and Analytical Tools
Http://map.sdsu.edu/arc
Required Web Browser: Java applets capability (IE 5.0 or Netscape 4.0 later) Suggested Screen Resolution 1024x768
Project Demonstration: http://map.sdsu.edu/arc
GPS / Remote Sensing Images Data Integration
GPS data collected by MTRP Park Rangers with their Trimble GPS units and Pathfinder Office software.
Research teams converted the GPS data sets to Shapefiles and integrate them with our ArcIMS server.
MTRP BMX (motor-crossing bicycling) GPS Data in ArcIMS
Image Overlay Function (Change Detection)
•
Image Processing
•
Image Filtering
•
Image Viewing
Current Internet GIS Capabilities
What can we do now?
On-line display (spatial features)
On-line query (attributes)
Very limited GIS functions. (Identifying, selections, buffering? ).
On-line editing new graphs/data and send back to servers.
What can we not do now?
Full GIS operations (overlay, network analysis, 3D…)
Upload a GIS Model or procedures to server side.
Integration of different vendors’ packages (ArcIMS, MapGuide, GeoMedia Web Map).
Future Development
•
Smart Mapping Software
Intelligent Software Agents, (searching requested GIS data automatically) •
Mobile devices
GPS / Cellular Phone/ PDA Integration •
Real-time GIS functions and Modeling
Hydrology modeling (flood control: ALERT systems), Wide fire modeling, Earth Quake simulations, etc.