On 4/9/2012 12:00 AM, Clifford Snow wrote:
On Sun, Apr 8, 2012 at 10:39 PM, Martijn van Exel <[email protected]
<mailto:[email protected]>> wrote:
Hi,
Remapping in CA, I come across some weird stuff.
Here's some NHD 'data':
http://www.openstreetmap.org/?__lat=35.17764&lon=-119.12641&__zoom=16
<http://www.openstreetmap.org/?lat=35.17764&lon=-119.12641&zoom=16>
Either the aerial imagery is way off here, or this is just bad data.
If it is, I presume that there has been a review of this data before
import, this is the exception, and the vast majority of imported NHD
objects actually do represent reality. I hope.
--
Martijn van Exel
Are you talking about the water - lakes and ponds? From reading
nmixter's diary, he/she has posted comments about mapping farms. One
comment suggested taking the import to the talk-us mailing list. BTW - I
did just drive through some farm land in Western Washington. Farmers
had dug temporary canals to help drain (or so I assumed) the water from
the field so they could plant. I probably wouldn't map it unless they
were permanent.
Yes, I see a lot of water features that are just not corroborated by the
aerial imagery, which could mean one of at least three things:
1) The aerial imagery is out of date
2) The NHD data is out of date
3) The NHD data represents something I don't understand (the future, a
temporary situation (which should not be in OSM), something underground?)
--
Martijn van Exel
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