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Landsat Acquisitions

The Landsat 8 and Landsat 9 satellites are managed as a constellation and together acquire nearly 1,600 scenes each day. Data from the new acquisitions become available for download within 6 hours of acquisition.

The USGS Landsat Multi-Satellite Operations Center (LMOC) oversees and ensures the acquisitions are successful and manages any anomalies that may arise.

 Long Term Acquisition Plans

Landsat 8 and Landsat 9 acquire imagery directed by the Long Term Acquisition Plan (LTAP) established for each satellite. Each LTAP utilizes parameters such as seasonality, land definition, historical cloud cover, gain settings, and sun angle to determine the daily acquisition schedule. Nearly all day-lit imaging opportunities are scheduled for both satellites. Day-lit images are defined as images with sun elevations greater than five degrees. 

Every day, the LMOC assigns a priority to each Landsat 8 and Landsat 9 scene scheduled to be acquired (collectively known as the day’s candidate scenes), based on each satellite’s LTAP priority assignments. These assignments help optimize acquisitions by taking into account the scheduled acquisitions, as well as any special requests that may be received from the user community.

The LTAPs direct that the following acquisitions be made:

  1. Over 99 percent of descending day-lit land images between 57 degrees North (Row 21) and 57 degrees South (Row 104) latitudes where the side lap between paths is less than 50 percent.
  2. Over 91 percent of the descending day-lit land images beyond 57 degrees with decreasing priority inversely proportional to the amount of side lap between paths.
  3. Over 99 percent of open water scenes, such as the Mediterranean, Baltic, and Caribbean Seas, that complete land intervals and reefs.
  4. Nighttime, open ocean, and ascending scenes are only acquired by special request. The success rate is a function of priority and cloud cover thresholds assigned. Over 95 percent of special request images submitted are approved and are acquired.

The map below shows the geographic coverage of acquisition priorities for Landsat 8 and Landsat 9 on a typical day. Lower priority scenes (shown as purple and red) are more likely to be rejected to meet the daily limit, while the highest priority scenes (shown in green, yellow, and orange) are only rejected for spacecraft maneuvers or rare calibration events.

Geographical Display of Landsat Acquisition Priorities Example
An example of the geographic coverage of Landsat acquisition priorities.

 

Special Requests for Future Landsat Acquisitions

Special requests can be made for the acquisition of Landsat 8 or Landsat 9 scenes that do not fall within the candidate images acquired by the logic defined in the information  described above. Special requests are only needed to acquire night, low sun elevation, ocean, and ascending day-lit data, or for emergency response operations. All attempts will be made to accommodate emergency requests over other high priority activities. However, most activities, such as spacecraft maneuvers, are required and cannot be changed to acquire data.

Single Path/Row Request Form – Complete and submit this form for requests that fall in one path/row range.

Multiple Path/Row Request Form  – to custserv@usgs.gov for requests encompassing more than one path/row range. You may also send a list of path/rows with your email in a .csv format. Example file for multiple paths/rows

When you submit your requests, you will be notified when they are received. After review, you will receive another email notifying you if your request was denied or approved.

 

Landsat 7 Acquisitions

 From 2013 to April 6, 2022, Landsat 7 acquired data based on a continental acquisition strategy, in which data over Antarctica, oceanic islands, Greenland, and Row 9 and above were no longer acquired systematically. 

Starting April 6, 2022, Landsat 7 acquisitions were suspended to allow for a series of spacecraft burns to lower the satellite’s orbit by 8 kilometers (km). (Learn more about this activity

Landsat 7 imaging resumed on May 5, 2022, at a lower orbit of 697 km after the April maneuvers lowered the satellite. Data from the Landsat 7 extended science mission were released the end of August 2022. The Landsat 7 extended operations plan is to continue acquiring science data through the end of September 2022, when the mean local crossing time will be around 8:35 AM.  This News announcement contains more details about the Landsat 7 extended science mission.