I have converted a raster to a polygon, dissolved the polygons into singlepart, and tried to calculate areas using Calculate Geometry. Many of the areas are 'zero' or are areas that are obviously not correct.
How can I fix this?
When I calculate the areas for the undissolved polygons they appear to be correct. They are just subdivided into grid cells with the same spatial resolution as the Landsat image from which they are derived (30m x 30m). So, one grid cell has an area of 900 sq meters. The problem is that I need the grid cells dissolved so I can determine the exact number of polygons and their respective areas, hence the use of the dissolve tool.
The defined projection is WGS UTM Zone 9N (the same as the Landsat image) and it has never been changed.