This animation was created by the AIMS Data Centre in conjunction with the Long Term Monitoring Project. Data was collected using the manta tow method at various reefs. These data were interpolated using IDW (Inverse Distance Weight) function to create a grid for each year. IDW is available in the package gstat for the language R. The interpolation used a fixed radius of 1 degree. Any cell in the grid which contained less than three points was assigned a no data value.