Presentation on theme: "Vegetation Mapping Low Lying Islands in the Pacific Using VHR Satellite Images Kataebati Bataua SPC-SOPAC."— Presentation transcript:
Vegetation Mapping Low Lying Islands in the Pacific Using VHR Satellite Images Kataebati Bataua SPC-SOPAC
Purpose of Vegetation Mapping (Land Cover) Picture of available coconut palm resource (alternative energy, etc.)Picture of available coconut palm resource (alternative energy, etc.) Food securityFood security Base line of vegetation cover to monitor impact of climate changeBase line of vegetation cover to monitor impact of climate change
Display GeoEye Data Texture of GeoEye data allows to separate palm and natural forest
Spectral Information False Colour Infrared Natural Colour
Vegetation Classes Coconut palm cover (3 densities !)Coconut palm cover (3 densities !) 1.Coconut plantation 2.Dense coconut 3.Scattered coconut ForestForest MangrovesMangroves ShrubShrub Settlement influenced areasSettlement influenced areas Bare Land (grass, none vegetation)Bare Land (grass, none vegetation) Water body (on the island)Water body (on the island)
Counting in MapInfo MapInfo automatically counts the number of palms within the plots using SQL select SQL Result
The number of palms is counted through a semi automatic process connecting MapInfo GIS software with Access Database software Transfer MapInfo (GIS) Access Database
Analysis in Access SumSum MinMin MaxMax MeanMean No PlotsNo Plots Area plotsArea plots Area StratumArea Stratum (Pot. No. Plots)(Pot. No. Plots)
Description of Stratum Average number of palms/hectareAverage number of palms/hectare Variability of the palm densityVariability of the palm density Exactness of countingExactness of counting For 20 plots(randomly) of 50 x 50 metres the coconut palms were counted in the stratum "Scattered Coconut" on the satellite image data. This represents an area of 17,507 m 2. This stratum covers 41,423 m 2 and theoretically 17 plots could have been analysed instead of 20. The number of palms varies from 12 (min) to 14 (max) which represents 48 or 52 palms/ha with an average of 49 palms/ha with very small standard deviation of +2 palms/ha and a standard error of + 0.6.
Needed for Productivity: Number of palms / hectare for dense standsNumber of palms / hectare for dense stands Age of palmsAge of palms Amount of hybridsAmount of hybrids Soil informationSoil information Transport distanceTransport distance 50 – 100% under estimation
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