Post on 20-Jan-2016
Dynamic Web Pages (server)
Browser
Client Server
Web Server
HTML File
Image File
HTML File
Image File
Database
Web Script
Internet
GIS Web Servers
Browser
Client Server
Web Server
HTML File
Image File
HTML File
Image File
Database
Web Script
Internet
GIS Files
GIS Server
GIS On the Web
Map Quest
Client Software Closed Servers
Google Maps
GoogleEarth
Internet
GODM Server
JPL
ArcExplorer
ArcMap
World Wind
GODM Client
KML Files
Keyhole
i3
Open Servers
Google Maps
Map Quest
Key Issues• Parameters:
– Schedule– Resources ($, people, equipment)– Features– Performance– Data: Large amounts can kill performance
• 3 Decisions:– Client features– Web Server (GIS Server, Scripting,
Database)– Data configuration
Solutions
• Small amounts of data, static:– Files (Shapefiles and TIFFs) to download– KML files on a web site for GoogleEarth– Shapefiles with a GIS web server
• Medium amounts of data, query/search, periodic updates:– GIS web server with spatial database
• Large amounts of data, flexible, immediate updates:– Custom solution with spatial database
Client Support• Web-based clients:
– GoogleMaps– MapQuest– GODM Client– GoogleEarth Plug-in– ArcIMS (HTML, Java)
• Internet-based clients:– ArcExplorer– ArcMap– GoogleEarth– World Wind– VirtualEarth
• Client OSes:– Windows– Macintosh– Linux– UNIX
• Browsers:– IE– FireFox– Safari– Chrome?
Key Client-Side Questions
• Required features:– Web pages with 2d content?– Querying (search)?– 3d visualization?
• Web-based (GoogleEarth plug-in)?• Application based (GoogleEarth)?
• Recommendation:– 2D web site w/search– GoogleEarth support with KML files
Server Alternatives• OS:
– Windows– Linux– UNIX
• Web Server– Apache– Internet Information
Server
• Framework/Language:– ASP: VBScript– ASP: Jscript– VB.NET– C#.NET– PHP– Java– Python– Cold Fusion
Server Criteria
• We don’t have IT to support anything but windows
• IIS is easier to support than Apache and this can be changed later if desired
• Scripting Alternatives:– PHP: Fast, easy, OpenSource– ASP/VBScript: Fast, easy
• Question: Is OpenSource and issue for sponsors? (Don’t think they care)
GIS Web Serving
• All can use Shapefiles and external raster files. The issue is the Map Server and the Database– ArcIMS w/SQL Server– ArcIMS w/ArcSDE and SQL Server– Oracle Spatial– Map Server w/PostreSQL and PostGIS– GODM Server w/SQL Server– ERMapper (rasters only)
GIS Server Alternatives• Shapefiles -> Spatial Database• Rasters -> JPEG and/or PNG tile files• Alternatives:
– Map Server w/PostgreSQL & PostGIS– GODM w/SQL Server(?)– ArcIMS w/ArcSDE & SQL Server
• Issues:– High-resolution polylines– Large extent– Querying (Symbology?)– Updates
GODM Solution
• Client Environments:– Custom client with various backgrounds and
projections: GoogleMaps, MapQuest, NASA, i3
– GoogleEarth w/KML files
• Server:– GODM Server w/Custom spatial data format
(topological) inside SQL Server