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The title says it all, really. I am wondering what area is covered by a dataset which is one arc second wide.



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2 Answers 2

You might want to check out this page. Essentially, one degree longitude = 111km * cos(latitude)

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At sea level at the equator:

second of angle is one sixtieth of this amount: about 30 meters or 100 feet.


Arc-seconds of latitude remain nearly constant, while arc-seconds of longitude decrease in a trigonometric cosine-based fashion as one moves toward the earth's poles.

Arc seconds aren't really a great way to measure distance. Is there no possibility of using a ruler tool in your GIS or any kind of distance function?




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