A unit whose first Member is a Resolution cell and whose second member is the grey shade assigned to that resolution cell by a Digital count. A Landsat MSS Pixel represents about 0.44 hectares (1.09 acres) on the ground. One Landsat MSS Frame contains about 7.36 x 106 pixels, each described by one of 64 radiance values. A Landsat ETM+ or TM pixel represents about 0.09 hectares (0.22 acres) on the ground. Each Landsat TM pixel is described by one of 256 radiance values. (All values given for DN (digital number) Data only.)