Ascending Landsat scenes can be searched for, then either downloaded or requested for processing through EarthExplorer.
To search for nighttime scenes, you can use either the daytime (descending) path/row, nighttime (ascending) path/row, or the coordinates of your area of interest. If none of this information is known, you can select your area of interest on the map.
Note: Nighttime path/row numbers are not the same as daytime path/row numbers.
To search for nighttime (ascending) scenes, follow these steps:
- Access EarthExplorer.
- On the Search Criteria tab, enter the daytime path/row, nighttime path/row, or coordinates. If you don't know this information, you can click on your desired location on the map to create a red placemark.
Note: You must be on the Search Criteria tab to create a red placemark on the map.
- On the Data Set tab, select the desired Landsat Archive dataset(s).
- On the Additional Criteria tab for each dataset, change the Day_Night selection to Night.
- Click the Results tab. Once the results are returned, scenes can either be downloaded or a request can be submitted for processing.
If 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.
- Enter the daytime path/row into the first section and click Convert. The Latitude/Longitude coordinates will be displayed above the map.
- Click on the 'Convert from Latitude/Longitude to WRS-2 Path/Row' button, and enter in the coordinates displayed.
- Click Ascending Node, and then Convert.
- The nighttime (ascending) path and row will be displayed above the map.
- 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.