Ming-Hsiang TsouEmail: mtsou@mail.sdsu.edu

phone: 619-5940205Fax: 619-5944938

Internet GIServices

Department of Geography, San Diego State University

CA-OES CAL(IT)2 Feb. 20, 2002

From Centralized Systems to Distributed Services

Why Internet GIServices? 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 ServerInternet Map Server Three-Tie Architecture http://map.sdsu.edu

InternetMap

Server

ArcIMS

WebServer

map.sdsu.edu

Internet

Client (Web browser)+ Java applets

Client (Web browser)+ IMS Viewer

Client (Web browser)

RegionalDatabase(GIS)

Three Types of Internet GIServicesThree 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 TechnologiesKey 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/index/0,,939407-123112,00.html

GeoMedia Web Maphttp://www.intergraph.com/gis/customers/default.asp

Internet Mapping Software Comparisons

http://map.sdsu.edu/software-demo.htm

Problems for Internet GIS packagesProblems 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 CapabilitiesCurrent 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 DevelopmentFuture Development

•Smart Mapping Software Intelligent Software Agents,

(searching requested GIS data automatically)

•Mobile devicesGPS / Cellular Phone/ PDA Integration

•Real-time GIS functions and ModelingHydrology modeling (flood control: ALERT systems),

Wide fire modeling, Earth Quake simulations, etc.

GPS Integration and Mobile GIServices