A polar stereographic projection is applied using coastal features as control. This projection allows all the images along the coastline to be joined into a mosaic. Landsat TM or MSS imagery has its own projection, the Spatial Oblique Mercator. This projection is nearly conformal and has little scale distortion within the sensing range. This projection incorporates the Earth's rotation with respect to the orbiting satellite.
Scale is true along the ground track.
This projection was designed to minimise distortion of the imagery as it orbits the rotating Earth. It is good for continuous mapping using Landsat imagery.