Peter Childs wrote: >Sent: 28 September 2009 3:42 PM >Cc: talk@openstreetmap.org >Subject: Re: [OSM-talk] Field boundaries > >2009/9/28 Mark Williams <mark....@blueyonder.co.uk>: >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA1 >> >> courtland.yoc...@mindspring.com wrote: >>> I've been thinking a bit about this from a very different perspective - >that of parks and other open public areas where you might not have a chance >to walk the perimeter ... for instance, you've a dog who really doesn't >want that boring walk around the edge, but bobs and weaves all about the >space and this might be one of only a couple of potential visits you might >be able to make to the site. I think that an accumulation of unordered >points over time either by one person or multiple people who capture GPS >information _incidentally_ would be useful in defining the core of the >public (or private, in the case of tractors on farmland) space. There's no >need to gather tracks, merely points. Let the accumulation of points >define the space. This is something of a corollary to the notion of >"wisdom of the crowd" and it can be seen in action in the United States on >major thoroughfares, such as the interstate highways, where the >accumulation of multiple tracks over time can be u >> sed to define a way. >>> >>> user id on openstreemap = ceyockey >>> >>> ________ >> >> If I'm out walking with the dogs, I tend to not go near the edge UNLESS >> I'm mapping, because they won't crawl under hedges if I'm already a fair >> way off, but will do so happily if it doesn't take them far. I suspect >> I'm not the only one, so you'd end up with a ludicrously fat hedge. >> >> I also tend not to go into corners & will often stop a little before the >> end of a field. >> >> Mark > >I think this is a case of "Better to have a park with a ludicrously >fat hedge than no hedge, or field at all. With average GPS only giving >an accuracy of around 10-50 meters its not going to be far out anyway. > Whoooh! Thats a bit ancient. With a modern high sensitivity receiver you should be generally around 5m of error and certainly not more than 10m if you are in sight or an SBAS Egnos/Wass satellite and your GPS can use it.
Cheers Andy _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
