# Pq Question

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When a pocket query is executed based on distance (say... 25 miles from a point) which method of distance is used, the Pythagorean theorem method or the great circle calculation?

Also, does anyone know the algorithm for converting from DD MM.SSS to UTM ?

I don't know for certain, but I'm guessing the folks doing such things know the world isn't flat and used great circle math. (They already have that math in other places on the site...)

There are a number of resources to answer the second question. One such is:

http://www.uwgb.edu/dutchs/UsefulData/UTMFormulas.HTM

I could be wrong but I believe topozone.com has a converter for UTM

Also, does anyone know the algorithm for converting from DD MM.SSS to UTM ?

I think they actaully use the "dull pencil and old piece of string" method

Also, does anyone know the algorithm for converting from DD MM.SSS to UTM ?

I really like Fizzymagic's little GeoCalc program. No installation necessary - Just download it and run it. I converts the various types of coordinates and does distance and projection calculations too. RM

Also, does anyone know the algorithm for converting from DD MM.SSS to UTM ?

If you only have a couple of points to convert, you could also enter them into your GPSr and them change the units to UTM to convert them.

Nah, I'm writing a program that figures out specific things. So I need to know HOW to do it rather than have a program that does it for me.

Edited by Team VaxCave
No, I'm writing a program that figures out specific things. So I need to know HOW to do it rather than have a program than does it for me.

Thanks, I totally missed that post.

I can't read or write. *sigh*

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