Ключевые слова: abstract, america, atlas, background, bitmap, black, borders, boundaries, boundary, chart, contour, country, cut, design, detail, detailed, diagram, digital, geography, graphic, graphics, high, illustration, isolated, map, mask, mercator, nation, national, outline, raster, resolution, rhode island, shaded, shading, shadow, shape, silhouette, state, states, surface, texture, united, usa, white,