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Open Source GIS Workshop
- 1. Open Source GIS and Spatial Data Analysis Software 2005 Crime Mapping Research Conference Jason Dalton Vice President, Research and Development Spatial Data Analytics Corporation [email protected] www.spadac.com
- 2. Reasons to attend this workshop: You need to streamline GIS data management and analysis functions You need low cost solutions to replace outdated commercial products You have a new analysis technique you’d like to try, but don’t know how to program software. You are a software developer looking to learn about open source development You don’t like paying for software
- 3. Workshop roadmap Distinction between freeware and open source Data access and manipulation GIS Viewers Data Analysis Web Mapping Spatial Databases GPS
- 4. Our Schedule 0800: Introductions, background 0815: Data Access and manipulation FWTools GDAL OGR GeoTrans R – shapefile package GeoCon 0900: Viewers ArcExplorer uDig dlgv32 0930 Break: 15 min 0945: Analysis R GeoR Geostats Spatstat Spatial 1030: Web Mapping SVG UMN Mapserver MapServer Workbench 1045: Spatial Databases PostGIS MySQL Spatial 1100: GPS Tools GPSDrive GPSBabel EasyGPS
- 5. Scope of this workshop There are thousands of Open Source software projects created each year. Which ones are included in this workshop? Windows capable Robust Vector operations Easy install Active user base Active developer base Free licensing for use
- 6. What is Open Source, and why do I care? First off, open source software is not a basement project by some college kids (OK, sometimes it is). Software that is developed according to the Open Source model is made available to anyone. Whether or not you agree with the Open Source model of software development, there are software projects that are stable, powerful, and can save you time and money at your job. Why not investigate? That’s all we’ll say about Open Source today, the rest of the workshop is all about the tools.
- 7. Data Access - Translators FWTools Collection of open source tools for translation, visualization, and reprojection OGR for vector data translation Translate SHP-> MAPINFO -> SDTS -> SHP
- 8. Data Access - Translators GeoTrans NGA sponsored software library for providing translation and reprojection to custom software. A graphical user interface wrapper program is included in the download package
- 9. Some of our tools use XML: XML = eXtensible Markup Language GML = Geography Markup Language SVG = Scalable Vector Graphics XSLT = eXtensible Style Language-Transformation VRML = Virtual Reality Markup Language RDF = Resource Description Framework
- 10. Benefits of XML structures for Geography Applications Useful for translating geo objects between platforms Compatible across operating systems Royalty free to use and distribute Text based files are searchable at the attribute level XML schemas exist for GIS functions Data encoding Visualization Spatial queries Since all XML docs are text, they can easily be created and edited by any scripting language
- 11. GML Geography Markup Language Separates content from the representation Structured geo objects in XML schema Published by the Open GIS Consortium Currently at version 2.1.1 April 2002
- 12. Benefits of GML data Multiple uses Browser Metadata Map production Custom map styling through style sheets Build custom stylesheets within your application Give users a choice of several styles with which to display data Editable maps Client, server, application level editing Sophisticated linking through XPath, XLink Link a layer of Parcels to an XML database or tax assessment Easier querying function for Web GIS (XQuery) Control over content regardless of file type or layer Allow users to download only the features necessary, filter out the rest Gives you the ability to send geographic data to any XML enabled device. 1 format suits all uses Clients, servers, PDAs, phones
- 13. SVG Scalable Vector Graphics An XML Schema definition for 2D graphics Free browser plug-in for viewer Viewer has built in zoom and pan functions Standard supported by major graphics software companies Embedded JavaScript to enable GIS functions within the file format
- 14. Cartographic features of SVG Traditional GIS shapes such as polygons, lines, points, text (rotated text) are all supported Color gradients for fills Stroke options (dash) for lines and polygon's boundaries Advanced graphics layering using opacity options Raster image backgrounds Filter effects (Shadows, etc.) High quality output and printing (Scalable) XML - linking and embedding Text on the map is searchable Coordinate transformations Objects react to user inputs Animation (vehicle tracking, stream flows, fault line movement)
- 15. Data Access - Translators GeoCon Converts Shape and MapInfo Tab files into GML and SVG graphics. What’s unique is that the SVG converter provides the user with a custom rendering interface before the SVG is created.
- 16. Data Access - Translators R – MapTools package Reads and writes shape files. Performs some GIS functions.
- 18. Data Viewers uDIG Viewer Open source viewer with very nice features. Opens major GIS file types, and connects to online geodatabases and web mapping services
- 19. Break Time!
- 20. Spatial Data Analysis R Image Contour Filled Contour
- 21. Spatial Data Analysis GeoR R package for performing spatial autocovariance analysis. Created by Paulo Ribeiro and Peter Diggle
- 23. Web Mapping UMN Mapserver (MS4W)
- 24. Spatial Databases PostgreSQL / PostGIS Spatial query engine built on a SQL compliant open source database Similar in function to ArcSDE, Oracle #g, etc.
- 25. GPS related tools EasyGPS GPSBabel CrimeStat GeoDa Other tools Honorable mention, but not covered here. They are covered elsewhere at the conference.
- 26. GPSDrive
- 27. Links to more resources www.remotesensing.org www.maptools.org www.ai-geostats.org cran.r-project.org www.spadac.com/research/ www.opensource.org
- 28. Open Source GIS and Spatial Data Analysis Software Jason Dalton Vice President, Research and Development Spatial Data Analytics Corporation [email protected] www.spadac.com