Landsat Missions
Question:
What is definitive ephemeris?
Answer:
An ephemeris is a set of data that provides the assigned places of a celestial body (including a manmade satellite) for regular intervals. In the context of Landsat 7, ephemeris data shows the position and velocity of the spacecraft at the time imagery is collected. Definitive ephemeris has been refined to show the position and velocity of Landsat 7 in one-minute intervals.
The Landsat Data Users Handbook provides more details on definitive ephemeris, and files can be downloaded from the Landsat Web site.
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://landsat.usgs.gov
Page Contact Information: landsat@usgs.gov
Page Last Modified: November 24, 2009
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