Graphic constraints mainly deal with aspects of perceptibility such as size, width and separability. Categorical data
consist entirely of area features where each category is assigned a different color fill. Depending on the color, different
parameters for minimum perceptibility may apply. Furthermore, symbolization effects have to be considered since the line weight of the outlines of polygons or regions is affected by scale change. Figure 2 presents an overview of distance
related constraints within and between patches for both vector and raster data