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Question:

How do I search for and download ascending (nighttime) scenes?

Answer:

Ascending (nighttime) Landsat data can be searched and downloaded from EarthExplorer

  1. Access EarthExplorer.
  2. On the Search Criteria tab, enter the coordinates of your area of interest, or select the area on the map interface. 
  3. On the Data Set tab, select the desired Landsat dataset(s).
  4. On the Additional Criteria tab for each dataset, change the Day_Night selection to Night.
  5. Click the Results tab. You can now download the data. 

Ascending (nighttime) WRS-2 Path/Row numbers are different than descending (daytime) Path/Rows; f you know the daytime path/row or coordinates, and want to know the nighttime path/row, access the WRS-2 Path/Row to Latitude/Longitude Converter.

Note: If the coordinates are known, you can skip step 1.

  1. Enter the daytime path/row into the first section and click Convert. The Latitude/Longitude coordinates will be displayed above the map.
  2. Click on the 'Convert from Latitude/Longitude to WRS-2 Path/Row' button, and enter in the coordinates displayed.
  3. Click Ascending Node, and then Convert.
  4. The nighttime (ascending) path and row will be displayed above the map.
  5. Use the coordinates or nighttime path/row in your search on EarthExplorer, using the instructions above.

Note: Cloud cover values for night scenes will always be zero for Landsat images. This FAQ explains why.