On Friday, 23 January 2015 from 8:00 a.m. to 5:00 p.m. (USA Mountain Time), we will be performing scheduled maintenance, which may cause temporary disruptions to our Web site, applications, and FTP. We apologize for any inconvenience this may cause you.
white = pixels in the northern hemisphere.
black = coastline and graticule pixels overlaid.
grey = pixels in southern hemisphere (no data values are displayed for these pixels).