/** nes full display resolution 256x240 -> 512x480 -> 1024 -> 960 **/
The entire overworld is 4096 x 1344 pixels, 16 x 8 rooms, and 256 x 88 tiles in size.
Each room (a single screen) is 16 x 11 tiles in size (the bottom row only shows the top half of the tile). It is 256 x 176 pixels in size (if you count the bottom half of the bottom row).
Each tile, including Link himself, is 16 x 16 pixels in size.
There are seven colors used on the overworld map (though the RGB values may not be perfect):
(32, 56, 236) blue
(252, 252, 252) white
(200, 76, 12) brown
(0, 168, 0) green
(116, 116, 116) gray
(252, 216, 168) tan
(0, 0, 0) black