1. Web Services - The User Experience Allan Doyle, adoyle@eogeo.org DSTT WGISS 19

2. DSTT Web Services2 What users want. Instant gratification Fast response Smooth “feel” Rich experience

3. WGISS 19DSTT Web Services3 What the web delivers Page by page user interfaces Entire page reloads to update small bits of information We have gotten used to this (traditionally)

4. WGISS 19DSTT Web Services4 What has been tried HTML Frames –Allows some information to stay on the screen while smaller amounts are updated Animated GIF –Adds “life” to a page without too much download lag –Can be quite annoying Java –Long download times –Not as compatible among platforms as hoped

5. WGISS 19DSTT Web Services5 More recent developments Flash –Initially a closed, single-vendor tool –More recently, not so closed, still single- vendor SVG –Very open standard –Poorly implemented Javascript –Initially had compatibility problems –Becoming easier to deliver across platforms now

6. WGISS 19DSTT Web Services6 Thick clients are no longer taboo Initially Disguised as “plug-ins” –Real Media –Windows Media Player –Quicktime Now people are willing to download if “cool” enough –NASA World Wind –Keyhole

7. WGISS 19DSTT Web Services7 New ideas are emerging RSS –“Really simple syndication” –Thick clients or web clients –Provides an information stream –People feel connected

8. WGISS 19DSTT Web Services8 AJAX - Asynchronous JavaScript + XML © 2004 Adaptive Path, LLC

9. WGISS 19DSTT Web Services9 © 2004 Adaptive Path, LLC

10. WGISS 19DSTT Web Services10 © 2004 Adaptive Path, LLC

11. WGISS 19DSTT Web Services11 Gmail Google Groups Google Suggest Google Maps Flikr Amazon’s A9 AJAX Applications

12. WGISS 19DSTT Web Services12 AJAX - Asynchronous JavaScript + XML http://www.adaptivepath.com/publication s/essays/archives/000385.phphttp://www.adaptivepath.com/publication s/essays/archives/000385.php

13. WGISS 19DSTT Web Services13 3 demos Thick client –Open source, “osgPlanet” (pre-release) –Shows 3d view of world using OGC WMS –Provides local caching for performance Flash client –Provides map of world with clickable countries –Map shows news events in/about the country –Developed by Clive Best, JRC AJAX –Google maps with some “hacks”

14. WGISS 19DSTT Web Services14 URLs Demo 1 –http://www.remotesensing.org/tiki- view_blog.php?blogId=2 Demo 2 –http://www.eogeo.org Demo 3 –http://weblog.infoworld.com/udell/gems/gmap2_flash.ht ml –http://www.gnik.com/maps/google/ –http://www.gnik.com/wiki/GoogleMaps