Editing Automatic picture transmission (section)

=== Images ===
[[Image:NOAA_19_APT_Image.jpg|left|thumb|An APT image of western North America in visible and infrared bands]]On NOAA [[Polar Operational Environmental Satellites|POES]] system satellites, the two images are 4&nbsp;km / pixel smoothed 8-bit images derived from two channels of the [[advanced very-high-resolution radiometer]] (AVHRR) sensor. The images are corrected for nearly constant geometric resolution prior to being broadcast; as such, the images are free of distortion caused by the curvature of the Earth.

Of the two images, one is typically long-wave [[infrared]] (10.8 [[micrometers]]) with the second switching between near-visible (0.86 micrometers) and mid-wave infrared (3.75 micrometers) depending on whether the ground is illuminated by sunlight. However, NOAA can configure the satellite to transmit any two of the AVHRR's image channels.