[Tagging] Help required on tagging a "wadi"

David Bannon dbannon at internode.on.net
Tue Sep 6 00:39:11 UTC 2016

On 06/09/16 08:08, Tod Fitch wrote:
>>> There are places in the desert southwest of the United States where the place you drive is exactly the water course. And these can extend for miles. Saying that one feature on the ground needs to OSM objects because they have different properties is bogus: It is one object, you drive on it 99.9% of the time, and it carries water 0.1% of the time (percentages arbitrary here and will vary from one instance to the next).

"....needs to be separate OSM objects .... bogus...." ?  No, sorry Tod, 
I disagree. The water course is made by a rain event. The road is 
something we have made, in practice just by driving along there in this 
case. Both the road and the water course will change over time but 
possibly independently of each other.   A example close to my heart is 
the road to the Finke Gorge National Park, N.T. AU. About 15 to 20Km 
from memory. When I first used it, it was almost all through the dry 
river bed. Over time, some parts are now along the banks and around 
obstacles. The road is referred to on maps and in National Park rules 
(etc), the waterway is defined by water flow, governed by the occasional 
rain  event. They have a different history, a different use and a 
different future.


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