On Tue, Dec 22, 2009 at 4:02 PM, John Smith <deltafoxtrot...@gmail.com>wrote:
> 2009/12/23 Robin Paulson <robin.paul...@gmail.com>: > > i had an idea recently, that it might be possible to map a stream or > > small river (in an area with poor aerial photo coverage) by using a > > gps in a waterproof container attached to a flotation device > > I had the same thought in about June, but decided it wasn't worth > pursuing since you would have to figure out how to recover it and > that's assuming it doesn't get snagged on something or stolen. > > About the same time someone announced a GPS received + GSM transmittor > for shoes for dimentia/alzhimers patients, the would require close > proximity to a phone network, which may not be as much of an issue in > other countries as it is here. > > _______________________________________________ > talk mailing list > talk@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk > Same idea, similar problem. Also most streams around here ends up in large rivers, it is also impossible to follow along/close to most of these streams. It can pass through large areas with no GSM coverage, so the only way to track them would be radio beacons, HF-transmitters with good power output is heavy and would require a large floatation device, something that increases the chance for snagging and also damages when passing over waterfalls. Another solution could be to follow "Whitewater" techniques for gathering tracks, though that would eliminate a lot of streams with too little waterflow to pass in river qayaks, and would interupt the tracks around waterfalls. Whitewater enthusiasts can use this as an excuse to explore river streatches that are not that common for whitewater activeties, and also long expeditions along calmer water.
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