At 2011-02-17 22:21, Toby Murray wrote:
On Fri, Feb 18, 2011 at 12:09 AM, Val Kartchner <val...@gmail.com> wrote:
> On Thu, 2011-02-17 at 08:57 -0500, Phil! Gold wrote:
>> (TopOSM also shows a lot of intermittent streams from the USGS National
>> Hydrography Dataset.)
>
> Can we get this USGS dataset loaded? It would be more accurate than
> tracing from satellite images, and much quicker too.
http://wiki.openstreetmap.org/wiki/NHD
It has already been imported in some areas. Check the "Basins and
per-basin sign-ups" section on the above page for details. There has
not been an effort to do a nation-wide import though. As I understand
it, the tools have been provided for local people to do it on their
own. I have been meaning to look at this for Kansas...
Do look carefully at the results. In some places in the central/high
deserts of CA, the NHD contained many thousands of poorly-connected streams
that rarely seemed to correlate with actual features in surveys or
satellite imagery. A lot of this is the nature of water in the desert - it
tends to be very thin and to move around over time. The result was trouble
with object density and download sizes, server throttling violations, all
with no real benefit.
--
Alan Mintz <alan_mintz+...@earthlink.net>
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