Missions and Sensors

National Land Imaging (NLI) was an interagency effort (begun in 2006) to develop a long-term plan to achieve technical, financial, and managerial stability for operational land imaging.
The Worldwide Reference System (WRS) is a global notation used in cataloging Landsat data. Landsat 8 and Landsat 7 follow the WRS-2, as did Landsat 5 and Landsat 4. Landsat 1, Landsat 2, and Landsat 3 followed WRS-1.
The LDCM Long Term Acquisition Plan (LTAP-8) and the Landsat 7 Long Term Acquisition Plan (LTAP) direct the acquisitio
The Landsat satellites are not considered tasking, and data acquisition requests are not available to the general public.
Landsat Multispectral Scanner (MSS) images consist of four spectral bands with 80 meter spatial resolution. Approximate scene size is 170 km north-south by 185 km east-west (106 mi by 115 mi).
There is no difference between the two terms in reference to Landsat data sets. For most Landsat products we refer to them as bands, however, for the AVHRR data they are referred to as channels.