Resolution and File Sizes
Each pixel in a five metre resolution image will show five metres on the ground. This resolution causes a small, coarse file, which is ideal for an overview or site plan. For more detail, you can get a 0.25 metre image.
Files are available in most standard image formats such as JPEG, BMP, GeoTIFF, MrSID, however some raster file formats do not support georeferencing.