40 years mangrove development in kiribati n.
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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

40 Years Mangrove Development in Kiribati

Pacific Islands GIS&RS User Conference 27th to 30th November

Suva

Kataebati Bataua

laura majuro marshall islands
Laura, Majuro, Marshall Islands

1983 = 187 hectares

2000 = 140 hectares

Green = New vegetation

Red = Loss of vegetation

steps
Steps:
  • Scanning of map
  • Linear geometric rectification towards satellite image
  • Delineation of vegetation classes on map
  • Rasterising map and satellite image interpretation
  • Overlay analysis
tarawa 40 years difference
Tarawa 40 Years Difference

Mangroves are growing not shrinking !

investigated islands
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
possible sources of vegetation increase
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 ?
possible human influence for vegetation increase
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 ?
slide22

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

Thanks