Why are some Landsat TM scenes “missing” from the browse viewer?
The USGS Global Visualization tool will only display scenes that have browse images available in the inventory. Some scenes do exist in the USGS archive, but they do not yet have a corresponding browse images that has been processed. To access Landsat 5 TM data for which there is no browse, you will need to run a search on Earth Explorer to find the scene ID, and then contact Customer Services. As TM browse images become available in the future, they will be automatically added to the USGS Global Visualization tool.