1. A computer-implemented method comprising: analyzing content of a tile, the tile being representative of at least one of a map image or a map overlay; selectively encoding the tile into an encoded file format comprising a first format that has transparency ability or a second format that does not have transparency ability, the selectively encoding comprising: when the analyzed content includes a portion of a transparent region, selectively encoding the tile into the first format that has the transparency ability; when the analyzed content includes a substantial portion of opaqueness, selectively encoding the tile into the second format that does not have the transparency ability; and communicating the tile within the encoded file format for rendering by at least one of a client or a browser.