A thematic raster is a raster with associated attributes. Normally, rasters present spatial information as pixel values. The numeric value of the pixel represents the attribute for that pixel. Neighboring pixels with the same pixel value collectively represent a surface feature. In thematic rasters, the pixel values are associated to any number of attributes, which can be viewed using the Attribute Manager. In Focus, the attributes for a thematic raster are stored in a vector segment in its file.
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