in: PBricker; PBricker > 2007-01-12;
| # Posted 2007-01-13 06:45:19 | |
| walk: | There tracks are from the earlier gps units which are not nearly as precise or as capable of holding the signal as your run has shown. We found the same as Castle Craig and other runs since getting the smurf gps. |
| # Posted 2007-01-13 18:32:53 | |
| cmorse: | They were in full trailbuilding mode when I updated the map a few years ago, I'd go out, map a section, then the next week I'd find a new trail - often times I would be mapping a new trail and it would end - I'd look around, find a tool cache, then sure enough the next week the tool cache would be moved onwards again. And I know for a fact that a more trails appeared even before the first use of the new map.
A lot of those trails double back upon themselves so tightly I almost gave up on trying to map them the fieldnotes were so tight. I recall one stretch where the trail doubled back such that there were 4 or 5 parallel sections with only 10-12 feet between them - like what's the point? |
| # Posted 2007-01-13 18:34:02 | |
| cmorse: | PS - could you email me the GPS track? I'd be interested in overlaying it on the map in OCAD to see how accurate the new Sirf chipset is in relation to the mapped trails. |
| # Posted 2007-01-13 20:42:54 | |
| PBricker: | Old GPS plus a lot of creativity!
The double backing seems to be usually for getting up to the top of a steep section with only a gradual rise. And I think the bikers like the tight turns for challenges! Clint: I'll e-mail you a JPEG of the track in exchange for you telling me how to overlay the track onto a scanned map (JPEG) or an ocad map! |
| # Posted 2007-01-14 01:32:03 | |
| jjcote: | When Jon Nash and I mapped Oleta River in Miami, I thought this section of MTB trails was twisty and complicated. I've since run into a place in Littleton, MA, that has a much more perverse trail. It's really just one trail, because there are no junctions, but it keeps winding and twisting, and you keep getting the feeling that you must be close to some other section of the trail. It's something like 1/2 sq km, and I think I rode my mountain bike in there for an hour and a half once without managing to cover the entire thing. But that one was created by the motorized crowd. Pretty sure the motivation is just to make something that's challenging to ride, and to fit a lot into a small area. They remind me of Hilbert curves. |
| # Posted 2007-01-14 23:10:07 | |
| PBricker: | Yes, I thought immediatley about space-filling curves as we were doubling back on ourselves. Also thought about the convolutions of the cerebral cortex, though that's about maximizing surface area rather than length. |
| # Posted 2007-01-15 00:21:35 | |
| jjcote: | Same concept, just expanded to a higher dimension. Do you know how to cut a hole in an index card and pass your body through it? |
| # Posted 2007-01-15 04:03:58 | |
| PBricker: | You asked me that in Colorado and I drew a blank. But in this context, I figured it had to do with cutting the card in some circuitous way so as to increase the size of the perimeter of the hole. Then, rather than think about how to do this, I got lazy and googled a cool illustration of it!
http://www.puzzles.com/PuzzlePlayground/ThroughPos... |
| # Posted 2007-01-15 05:48:13 | |
| PG: | I just assumed you punch a rather small hole and then get poured through after cremation.... |
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