A method is provided for setting, by a processor, a minimum and maximum symbol size for rendering at different zoom levels on a digital map. In another embodiment of the invention, the size of overlay features, such as line widths, received by a processor is automatically adjusted for different zoom levels depending on the average size of map features, such as polygons. In one example, line widths are decreased, and/or made partially transparent, as the map views are zoomed out, finally being altogether eliminated. In one embodiment, the system automatically analyzes received data to determine an appropriate way to map the data.