This document discusses several open source web mapping frameworks: OpenLayers, ExtJS, and GeoExt. OpenLayers is a JavaScript library that supports OGC standards and has a large user and developer community. ExtJS is a JavaScript framework for building rich web applications with user interface components like forms and tables. GeoExt brings together OpenLayers and ExtJS to allow building of spatial rich internet applications with maps integrated with user interface elements like toolbars, legends, and tables.

1. Open Source WebMapping

2. Architecture

3. Architecture

4. Architecture

5. Architecture
● Compliance with Standards
● OSGeo Certified/Incubation
● Available resources
– Documentation
– Examples
– Articles
– Use cases
● Community activity
● Personal Preferences

6. Architecture

7. Architecture

8. OpenLayers
● Javascript API
● Supports OGC Standards
● OSGeo Project
● Big user and developer community

9. OpenLayers
● Lots of formats (WMS, WFS, GML, SLD, …)
● Several map controls (Zoom, pan, TOC, Scale, …)
● Spatial editing
●
Interaction with 3rd party services (OSM, Google,
Yahoo, Bing Maps, Geonames, …)
● Easy to Learn
● Nice and useful example galley
USE THE SOURCE

10. OpenLayers
● MAP

11. OpenLayers
● LAYERS

12. OpenLayers
● LAYERS

13. OpenLayers
● CONTROLS

14. OpenLayers
● CONTROLS

15. ExtJS
● Javascript API
● Dual-license
● Developed and Supported by Sencha
● Big user community
● For building Rich Web Applications
● Rich UI interfaces

16. ExtJS
● Lots of fields: numeric, text, date, checbox &
groups, combobox, fielsets, …
● Forms and Tables
● Windows, Panels, Tabs and Trees
● Animations
● Dynamic Charting
● Supports XML, JSON

17. ExtJS
● FORMS & FIELDS

18. ExtJS
● WINDOWS, TABS, TABLES, TREE

19. GeoExt
● OpenLayers is good for maps, though it has
few and limited UI components
● ExtJS has lots of UI components and
functionality but … mapping is lacking
● GeoExt brings both together to allow easy
building of Spatial RIA

20. GeoExt
● Map in windows, panels and tabs
● TOC in a tree
● Map controls in toolbars
● Feature information in forms, tables
● Legend Panel
● Scale Combobox

21. GeoExt
● MAP IN WINDOW

22. GeoExt
● FEATURES AND TABLES

23. GeoExt
● SCALE COMBOBOX AND LAYER TREE

24. Spatial RIA

25. Spatial RIA

26. Conclusions
● Big diversity of Open Source software
● Big modularity is an healthy advantage
● Powerful frameworks available
● It's fun and easy to learn
● The big question is: CAN YOU DO
IT???