USGS Frequently Asked Questions

FAQ's about Remote Sensing

Does red in ASTER images always represent vegetation?

How is Gas Hydrate studied?

What is a geographic information system (GIS)?

What is Landsat 7?

Why should I take time to preview a satellite image?

How is the cloud cover calculated, and why are some scenes cloudy when the cloud cover is reported to be 0%?

Why do the Landsat 7 (ETM+) browse images look so different from the Landsat 4/5 (TM) images?

Why are there so few international Landsat scenes available from USGS?

What is remote sensing used for?

Why do some Landsat 7 browse images appear to be split midway through a scene?

Why are some of the Landsat TM browse images so blocky?

What is remote sensing?

Why is there so much color variation among the Landsat 7 browse images?

Will Corona imagery be digitized?

Get the next 20 FAQ's

Change the number of FAQ's shown to: 1 5 10 20 50 100