Free open source gis

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  • Open Source Software Image Map(OSSIM) Udig is from Refractions
  • OGC(R) standards are technical documents that detail interfaces or encodings. Software developers use these documents to build open interfaces and encodings into their products and services. These standards are the main "products" of the Open Geospatial Consortium and have been developed by the membership to address specific interoperability challenges. Ideally, when OGC standards are implemented in products or online services by two different software engineers working independently, the resulting components plug and play, that is, they work together without further debugging
  • is developed using openlayers


  • 1. Free and Open Source GIS an introduction to open-source spatial software/GIS
  • 2. What is Free &Open Source GIS?Why use Free Open Source GIS?Why teach Free open source GIS?Different types of Free open Source GISMisconceptions about Free Open SourceGIS
  • 3. What is Free &open source GIS?  The freedom to use the software, for any purpose.  The freedom to study how the software works and to change / adapt it to fit your needs. The freedom to redistribute copies.  The freedom to distribute copies of your modified software to others, allowing the community to benefit from your changes
  • 4. FOSS4G:Free and OpenSourceSoftware forGeospatialOSGEO:The OpenSourceGeospatialFoundation
  • 5. Why Use Open Source GIS? Supported by huge development & support community Community is very passionate about helping each other and continually improving softwareLow start-up costs It is now possible to install a complete GIS stack without paying a cent - LEGALLYSecurity Arguably more secure than proprietary software Backed by large development community Complex Bugs are found and fixed quickly
  • 6. Why Use Open Source GIS? (cont’d)Works on all major platforms (Mac, Linux, Windows)Nothing is missing, Desktop GIS, Spatial Database Storage, Server... Tons of analysis tools (No licensing worries) Community developed add-onsWorks with existing GIS data Import .shp files, most major formats Export to most major formats Support all Major file formats Vector formats and Raster Formats(Import and Export or directly works on the base format)
  • 7. Why Teach Open Source GIS?1. Basic exploration on GIS Softwares and Projects2. Becoming an increasingly necessary job skill, Companies with existing GIS(Packages) are interested in using open source GIS softwares3.Makes GIS marketable to smaller firms and non-profits4. Drives innovation, through sharing of knowledge & source code5. Code is open and human-readable for developers.
  • 8. The Stack of Free GIS Free Alternatives For Your GIS NeedsQuantum GIS - Desktop GIS - (Geographic Resources Analysis Support System) PostGIS - Spatial Database - Server for Online Publishing/ Data Sharing - Web Application Programming Interface (API) are many more options, but these are good so far.
  • 9. Open GIS Desktop Softwares
  • 10. Quantum GIS (QGIS) Desktop application – very user friendly Can work directly with .shp file, and too many to list Any Platform – Windows, Mac, Linux FREE Plugins available (Similar to Firefox add-ons) Allow spatial analysis, 3-D analysis, statistical analysis... User interface for GRASS tools. (Default) PostGIS interface. (Default) Map Server export(Default)
  • 11. GRASSGeographic Resources Analysis Support SystemGRASS is developed by a worldwide network ofdevelopers who continue to release new GRASS versionsregularly.GRASS is used for used for geospatial data managementand analysis, image processing, graphics/map production,spatial modelling, and visualization.
  • 12. GRASSGeographic Resources Analysis Support System Geospatial data management Analysis Image processing Graphics/maps production Spatial modeling Visualization Tons of tools + functions = Very complex analysis Now theres a simple user interface through QGISGRASS is an official project of the Open Source Geospatial Foundation.
  • 13. GDALGDAL is a translatorlibrary for rastergeospatial dataformats...It also comes with avariety of usefulcommand line utilitiesfor data translationand processing.
  • 14. With GDAL tools you can:Report information about a file.Copy a raster file, with control ofoutput format.Warp an image into a newcoordinate system.Contours from DEM.Tools to analyze and visualize DEMs.Build a quick mosaic from a set ofimages.Rasterize vectors into raster file.Transform coordinates.
  • 15. Free Open GIS Databases
  • 16. PostgreSQL + PostGISPostgreSQL is a powerful, open source object-relational database systemgood spatial databaseConforms to Open Geospatial Consortium standards(ArcSDE can connect to it)Secure storage for both spatial and non spatial dataColumn level permissions granularityPostGIS "spatially enables" the PostgreSQL server, allowing it to be used as a backend spatial database for (GIS), much like ESRIs SDE
  • 17. Spatial Lite• The SpatiaLite extension enables SQLite to support spatial data too [aka GEOMETRY], in a way conformant to Open GIS specifications.• Supports all spatial data formats with open GIS specifications• supports importing and exporting from / to shape files
  • 18. Free open source Web GIS
  • 19. The Procedure Web GIS(Open Source)
  • 20. Map ServerMapServer is an Open Source geographic data rendering enginewritten in C. Beyond browsing GIS data, MapServer allows youcreate “geographic image maps”, that is, maps that can directusers to content.MapServer was originally developed by the University ofMinnesota (UMN) For Net project in cooperation with NASA,A map file may have zero, one or more OUTPUTFORMAT objectdeclarations, defining available output formats supportedincluding formats like PNG, GIF, JPEG, GeoTIFF, SVG, PDF andKML.
  • 21. OpenLayersJavaScript Library, including APISimilar to Google Maps APIMakes building dynamic mapping webpagesVERY easyProvides the tools needed to easily add amap to a webpageAllows overlaying your own dataCan display map tiles and markers loadedfrom any source
  • 22. Common Misconceptions about Open Source GIS Software• Not robust application.• No Commercial Support.• Opposite to proprietary Packages/ Softwares.• No regional/specific support.• Incompatible.• substandard compared to proprietary software
  • 23. Now What?Quantum GIS is a great place to start…If youve ever used a GIS, youll feel right at home! Tutorial users start with OSGeo4W
  • 24. Tutorials / User GuidesQGIS:, and more: