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GIS for environmental issues in the South Pacific: focus on water color

This presentation discusses the use of GIS for analyzing water color in the South Pacific, with a focus on chlorophyll concentration assessment in New Caledonia. It explores available data, integration techniques, and new algorithms for accurate assessment. The study also highlights the benefits of using GIS for environmental research and the potential for future collaborations.

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GIS for environmental issues in the South Pacific: focus on water color

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  1. GIS for environmental issues in the South Pacific: focus on water color G. Wattelez, C. Dupouy, M. Mangeas, J. Lefèvre, Touraivane, R. Frouin, A. N’Yeurt, A. Singh, H. Jacot des Combes Suva, 16 – 19 November 2015

  2. Plan • 1) GIS on the Web • Available data • Interoperability • 2) Water color in a SIG • How to integrate it • 3) New algorithm for chlorophyll concentration assessment in New Caledonia • Chlorophyll concentration assessment • Chlorophyll concentration in New Caledonia • Algorithm performance and application GIS for environmental issues

  3. Digital age • More and more data available on the Web • A phone number • Opening time • An address • Scientific data? • Bathymetric file of the world • Satellite images (NASA) • Our own data during research projects? GIS for environmental issues

  4. Research results • Many papers on the Web • OK for scientific community • What about other people? • What about data? • Available for all the concerned populations • Easy to handle • intuitive GIS for environmental issues

  5. Geographic portal • Since 2009, a lot of geographic data from scientific researches are stored and used at the UNC • Erosion in small watersheds • Risk estimation of forest fire • Evolution of water chemistry • Evolution of coastlines • … GIS for environmental issues

  6. How to show and use data from partners? • Many formats • ASCII, GeoTIFF, IMG, … • Shapefile, KML, GML, MapInfo TAB, … • Use standards for Interoperability • Open Geospatial Consortium (OGC) provides standards for sharing • WMS: images • WFS: features • WCS: coverages (raster data) GIS for environmental issues

  7. What we plan to do • IRD researchers collect and analyze satellite images (MODIS) for water color [GOPS project] • Pacific areas • Fiji • New Caledonia • Biogeochemical properties • Color Dissolved Matter (ChloéMartias – next presentation) • Chlorophyll-a concentration • Turbidity GIS for environmental issues

  8. What we plan 2 do • Integrate daily data of ocean color from MODIS in the geoportal • Add another product: chl-a concentration in New Caledonia GIS for environmental issues

  9. How chl-a concentration isassessed Rrs Products • Ocean color seen by satellite digitalized => Rrs (several wavelengths) • Rrs analyzed => products 412 Chl-a 443 SST Turbidity 667 GIS for environmental issues

  10. Chl-a concentration assessment in New Caledonia • NASA algorithm not adapted for New Caledonian waters • Created a new algorithm based on coincidences in New Caledonia • Algorithm validated on the global ocean (SeaBASS database) GIS for environmental issues

  11. Rrs measurements 412, 443, 488, 531, 555, 667 nm Chl-a concentration assessment in New Caledonia SVM model or another algorithm which could work fine (OC3) • Advantages? • Improve results of previous studies • Get an algorithm fully suited on the New Caledonia area Wattelez et al. 2015 (in press) GIS for environmental issues

  12. Image on New Caledonia July 20th, 2008 GIS for environmental issues

  13. DROPS status • Collect match-ups between in situ and remote-sensing data (biogeochemical parameters) [ChloéMartias, marine session] • Chlorophyll concentration • CDOM • Turbidity • Check if algorithms for assessments (of chl-a concentration, CDOM, …) give satisfying results • Improve results of algorithms Dupouy, Marine session GIS for environmental issues

  14. One image on Fiji (DROPS) GIS for environmental issues

  15. Prospective of our GIS study • Integrate daily data of ocean color on Fiji in a GIS, as temporal layers • Chl-a • CDOM • Turbidity • Model results • … GIS for environmental issues

  16. ThankyouverymuchVinakavakalevu GIS for environmental issues guillaume.wattelez@univ-nc.nc

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