RASTER CALCULATION

 

The use of interpolated vegetation maps makes temporal comparison easy to interpret, both visually, and by allowing easy quantification of changes in vegetation abundance and range to be calculated.

These processes produce a full assessment of the changes between every pixel for the compared images. This information can be used non-spatially for estimates of direction and degree of change, or spatially for mapping outputs. Again these can be incorporated into a GIS for display over map products or aerial imagery.

The ability of spatially located samples, combined with correct interpolation and raster comparison, for assessing population change is unsurpassed as can be seen below.

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Abundance of Spartina martima on Stiffkey Low Marsh: July 1992

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Abundance of Spartina martima on Stiffkey Low Marsh: July 2002

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Changes in abundance (as % cover) of Spartina martima on Stiffkey Low Marsh: 1992 to 2002

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Changes in abundance (areal extant) of Spartina martima on Stiffkey Low Marsh: 1992 to 2002

 

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