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Low-cost satellite-based products for the Web – the Example of Fire Web Service

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Low-cost satellite-based products for the Web – the Example of Fire Web Service

  1. 1. Low-cost satellite-based products for the Web – the Example of Fire Web Service Theodor Foerster GeoInfo 2010
  2. 2. Motivation • Real-time sensor data • Network-based data access – Internet & Intranet • Interoperability • Archive Enable web-based & interoperable data access for GEONETCast
  3. 3. GEONETCast – satellite-based dissemination system • Free of charge • 180 products - different applications • Global products – world-wide coverage • Real-time
  4. 4. Technical Setup – Receiving data
  5. 5. Interoperability • Establish common understanding on concepts • Web Services – Common interfaces available through the Web – HTTP & XML • Open Geospatial Consortium – Not-for-profit – international voluntary consensus standards organization
  6. 6. OGC Web Feature Service • Web Services for feature data on the web – HTTP & XML – GML – Features can be queried by featuretype – Query is expressed through Filter Encoding • Operations – GetCapabilities – DescribeFeatureType – GetFeature – Insert (WFS-transactional)
  7. 7. Technical setup – Web GEONETCast data server OGC Web Coverage Service OGC Web Map Service Clients getMap getCoverage Query real-time and historic data through interoperable Web Services OGC Web Feature Service getFeature GML / KML
  8. 8. MODIS data • Moderate Resolution Imaging Spectroradiometer [Justice et al. 1998] • Operated by NASA – Surface Reflectance – Land surface temperature – Vegetation index – Fire Products [Giglio et al. 2002] – Land Cover – Biological productivity
  9. 9. FireWebService • Desaster management • Based on MODIS fire product (mod 14) • Identify potential fires – Fire detection algorithm – Raster  fire events as points – Confidence value • Processed from GEONETCast data
  10. 10. Architecture
  11. 11. Data insert <wfs:Insert> <de.fws:modisfiredata> <de.fws:the_geom> <gml:Point> <gml:coordinates decimal="." cs="," ts""> 168.143,-16.252</gml:coordinates> </gml:Point> </de.fws:the_geom> <de.fws:appearancedate>2010-06- 21T15:13:21Z</de.fws:appearancedate> <de.fws:line>1177</de.fws:line> <de.fws:sample>506</de.fws:sample> <de.fws:confidence>100.0</de.fws:confidence> <de.fws:adjcloud>0</de.fws:adjcloud> <de.fws:adjwater>0</de.fws:adjwater> ... <de.fws:stddevdt>1.2</de.fws:stddevdt> </de.fws:modisfiredata> </wfs:Insert>
  12. 12. Client application
  13. 13. Functionality • Query • Map • Inspect
  14. 14. Integration of crowd-sourced information • Identify related information through Google GeoCoding Service • Wikipedia • Panoramio
  15. 15. Google Earth integration Fire events published through KML & NetworkLinks
  16. 16. Implementation • Based on Free and Open Source Software • GeoServer • PostGIS • OpenLayers / GeoExt
  17. 17. Conclusion • Web-based access to GEONETCast data – Real-time & historical data – Fire Web Service • Interoperability – WFS & KML • Free and Open Source Software – GeoServer, GeoExt, OpenLayers • Open issues – Performance & endurance – Validation of results
  18. 18. Thanks for your attention! swsl.uni-muenster.de/research/geonetcast/ Theodor Foerster theodor.foerster@uni-muenster.de

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