1. Low-cost satellite-based products
for the Web – the Example of Fire
Web Service
Theodor Foerster
GeoInfo 2010

2. Motivation
• Real-time sensor data
• Network-based data access
– Internet & Intranet
• Interoperability
• Archive
Enable web-based & interoperable data
access for GEONETCast

3. GEONETCast – satellite-based
dissemination system
• Free of charge
• 180 products - different applications
• Global products – world-wide coverage
• Real-time

4. Technical Setup – Receiving data

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. 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. 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. 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. 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. Architecture

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. Client application

13. Functionality
• Query
• Map
• Inspect

14. Integration of crowd-sourced
information
• Identify related information through Google
GeoCoding Service
• Wikipedia
• Panoramio

15. Google Earth integration
Fire events published through KML & NetworkLinks

16. Implementation
• Based on Free and Open Source Software
• GeoServer
• PostGIS
• OpenLayers / GeoExt

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. Thanks for your attention!
swsl.uni-muenster.de/research/geonetcast/
Theodor Foerster
theodor.foerster@uni-muenster.de