[GeoStL] ARC filtering
- From: Glenn <GLNash@xxxxxxxxxx>
- To: geocaching@xxxxxxxxxxxxx
- Date: Sat, 16 Aug 2003 19:11:49 -0500
-
While researching one thing, i found this gem...
I have been asked many time how we cah search for caches that are a few
miles off of the interstate while traveling.. The answer was always... I
donno.
The answer NOW is "by using ARC filtering" which is just
what ya want you want to do. note from forum..
- RE: ARC filtering: Nope, it's new, and it's not yet available
in public versions of GPSBabel; you'll have to look at the CVS version to
see it. It allows you to filter points based on their distance from an
arc, which in GIS terminology is a series of connected line segments.
It's most useful in determining, say, which geocaches are within 10 miles
of Interstate 80 between New York and Chicago (assuming you can get
sufficient data on the locations of geocaches to actually make that query
worthwhile.)
- Another new filter that's in the CVS version of GPSBabel but not yet
generally available is polygon filtering, which can locate just the
points that fall within a specified polygonal region. This might be
useful for determining which caches fall within a particular state park,
county, or other large area.
Just released.... a new version of GPS bable that ARC
filters!!! Now How do ya do it??? I donno, but it is
worth looking into for traveling.
glenn
---------------------
Glenn
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