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USGS Frequently Asked Questions
FAQ's about Remote Sensing
What should I do if I have a question pertaining to ASTER Level 1 data that is not addressed in the
Customer Support Center
?
Why is there so much color variation among the Landsat 7 browse images?
Why are some of the Landsat TM browse images so blocky?
Why do some Landsat 7 browse images appear to be split midway through a scene?
Why should I take time to preview a satellite image?
Why do the Landsat 7 (ETM+) browse images look so different from the Landsat 4/5 (TM) images?
How is the cloud cover calculated, and why are some scenes cloudy when the cloud cover is reported to be 0%?
Could you give a brief description of ASTER and its sensor systems?
What on-line resources are available to learn more about ASTER?
What is Landsat 7?
What is the difference between a Band and a Channel?
Does red in ASTER images always represent vegetation?
Why measure the magnetic field at the Earth’s surface? Wouldn’t satellites be better suited for space-weather studies?
What film type is best for me?
What is meant by resolution of an aerial photograph?
What is CIR, B/W, BIR, and natural color?
Is there an index map for available ASTER images?
What is meant by focal length?
Why are there so few international Landsat scenes available from USGS?
What do the different colors in a CIR aerial photograph represent?
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