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40 Years Mangrove Development in Kiribati

40 Years Mangrove Development in Kiribati. Pacific Islands GIS&RS User Conference 27 th to 30 th November Suva Kataebati Bataua. Laura, Majuro, Marshall Islands. 1983 = 187 hectares 2000 = 140 hectares. Green = New vegetation. Red = Loss of vegetation.

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40 Years Mangrove Development in Kiribati

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  1. 40 Years Mangrove Development in Kiribati Pacific Islands GIS&RS User Conference 27th to 30th November Suva Kataebati Bataua

  2. Laura, Majuro, Marshall Islands 1983 = 187 hectares 2000 = 140 hectares Green = New vegetation Red = Loss of vegetation

  3. Rectification of Historical Aerial Photographs, Majuro

  4. Old Vegetation Maps & recent Satellite Images

  5. Steps: • Scanning of map • Linear geometric rectification towards satellite image • Delineation of vegetation classes on map • Rasterising map and satellite image interpretation • Overlay analysis

  6. Overlay Analysis

  7. Results Overlay Analysis

  8. Table of Change (Butaritari)

  9. Areas of ChangeButaritari

  10. Increase MangroveButaritari (2)

  11. Betio, Tarawa

  12. Tarawa

  13. Tarawa 40 Years Difference Mangroves are growing not shrinking !

  14. Kiribati

  15. Changes Tarawa

  16. Mangrove Increase Marakei

  17. Mangrove Increase Marakei

  18. Mangrove Change Onotoa

  19. Investigated Islands • 1 Makin, 2 Butaraitari, 3 Marakei, 4 Tarawa, 5 Maiana, 6 Aranuka, 7 Onotoa, 8 Tamana and 9 Arorae • Only in Makin slight decrease of vegetation

  20. Possible Sources of Vegetation Increase • Sea level fall ? • Geometric correction wrong ? • Interpretation of black and white aerial photographs 1969 partly wrong ? • Satellite image interpretation wrong ? • Changing water flow ?

  21. Possible Human Influence for Vegetation Increase • Environmental education ? • Coconut planting programmes after 1969 • Less need for mangrove as fire wood ? • Alternative fuel • Better drinking water • Better living conditions for mangroves ?

  22. Kiribati’s population is growing but the vegetation is growing as well (if trend continues) Thanks

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