Vegetation Change Detection in a Low Lying Atoll Island Kilifi Postgraduate climate change University of the South Pacific Kilifi Postgraduate climate change University of the South Pacific

Focus COMMUNITY PERCEPTION OF IMPACTS OF ENVIRONMENTAL AND CLIMATE CHANGE WITH SPECIFIC FOCUS ON VEGETATION CHANGES IN LOW LYING ATOLL ISLANDS: A CASE STUDY OF NANUMEA, VAITUPU AND FUNAFUTI INCOMMUNITY PERCEPTION OF IMPACTS OF ENVIRONMENTAL AND CLIMATE CHANGE WITH SPECIFIC FOCUS ON VEGETATION CHANGES IN LOW LYING ATOLL ISLANDS: A CASE STUDY OF NANUMEA, VAITUPU AND FUNAFUTI IN TUVALUTUVALU

Approach Use of individual’s perception living the study area as a tool to obtain useful information related to the topic;Use of individual’s perception living the study area as a tool to obtain useful information related to the topic; Use of GIS and remote sensing to perform mapping vegetation change with a scale of 1:10,000Use of GIS and remote sensing to perform mapping vegetation change with a scale of 1:10,000

Watersecurity

Biosecurity

Food Security

Bush Fires

Purpose for Vegetation Change Detection To determine the potential of using remote sensing in the context of vegetation change using photography with a scale of 1:10,000 in low lying atoll islands within a period of three years

Vegetation Change Detection: Mapping (satellite image) for year 2003;Mapping (satellite image) for year 2003; Mapping repeated for the 2006;Mapping repeated for the 2006; Overlay of both mappings;Overlay of both mappings; Highlighting change;Highlighting change;

Geometric Correction Essential

1.Image enhancement  To increase contrast between the vegetation types Image enhancement 2. Vegetation interpretation  Digitizing  Interpretation key

Dense coconut A clear forest among vegetation Mangrove vegetation

Raster Data - Vector Data vector data contains x, y co-ordinates, direction and distance to the next point, annotation is added to the polygonvector data contains x, y co-ordinates, direction and distance to the next point, annotation is added to the polygon raster data contains the annotation and x, y of is centreraster data contains the annotation and x, y of is centre

Vector to Raster TAB DXF ANNOTATION LAYER ERDAS RASTER

Overlay Analysis 1:10,

Change within 3 Years

Vegetation 2003

Vegetation 2006

Comparison 2003 &

Vegetation 2003

Vegetation 2006

Latest Mapping See SOPAC and LRD Website (soon)

Area Calculation Vegetation Cover 2003 – 2006 (Nanumea)

Conclusion Changes in vegetation detection were detected but very small simply because the period is too short.Changes in vegetation detection were detected but very small simply because the period is too short. Mapping vegetation change of 1:10,000 scale is possible in a low lying atoll islands within a 3 years period; Mapping vegetation change of 1:10,000 scale is possible in a low lying atoll islands within a 3 years period; Measured variables can be used later for future research;Measured variables can be used later for future research;

Thank You