Dave F. wrote: >Sent: 29 September 2009 10:29 PM >To: Peter Childs >Cc: talk@openstreetmap.org >Subject: Re: [OSM-talk] Field boundaries > >Peter Childs wrote: >> 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. >> >> Peter. >> >I wouldn't be such as slave to your GPS. >We all know of the apocryphal stories of GPS slaves who drive off cliff >faces. > >Just because you didn't walk to the corner doesn't mean you didn't >survey it. >If you're aware that the hedge isn't actually fat then don't map it as >such, do it as you saw it. >Your eyes are the most important/accurate piece of surveying equipment. >If your minds not to hot though, take a camera/paper/pen. > >If fields boundaries are straight, I rarely walk the whole perimeter, >just parts of those boundaries & extrapolate. > >Either that, or train you dogs to do as you order :-)
Or better still, train dogs to walk only under hedges and fit them with a GPS :-) Cheers Andy _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
