It's been my experience way back when in a past life that the Wetlands
Inventory (while busier and therefore appears to have more data) really
wasn't all that great spatially. We would use it for a reference for
mapping - as in "there should be a wetland here" and then interpret the
correct location of the wetland. I would just use it as a reference and
use the NHD..
Randy
--
Randal Hale, GISP
North River Geographic Systems, Inc.
ESRI Business Partner and Authorized Trainer
http://www.northrivergeographic.com
http://wordpress.northrivergeographic.com
423.653.3611 [email protected]
On 8/12/2010 12:40 PM, Ian Dees wrote:
Hmm. It sounds like we want the "routability" of the NHD reach-code
system with the accuracy and completeness of the Wetland Inventory.
I wonder if there's some "gotcha" in the FWS dataset that would make
it inappropriate to use. For example, I see a lot of freshwater areas
that are really inundation/flood control areas in my area. It would be
difficult for an import to tell the difference between those two things.
On Thu, Aug 12, 2010 at 11:35 AM, Steven Johnson <[email protected]
<mailto:[email protected]>> wrote:
I'm not an expert on either of these data sets, but I know enough
to say that USGS sponsored the development of the NHD, largely to
replace the old digital line graph (DLG) products. NHD serves as a
multi-purpose inventory of surface waters, grouped by watershed.
OTOH, FWS sponsored development of Natl Wetlands Inventory,
largely as a basis for habitat suitability. The data may overlap,
but they serve two different purposes/missions.
SEJ
----
"Wretches, utter wretches, keep your hands from beans." -Empedocles
On Thu, Aug 12, 2010 at 12:12, Ian Dees <[email protected]
<mailto:[email protected]>> wrote:
I wonder if our friends at the USGS know about this data. If
they do, there must be a good reason why they aren't using it
for NHD, since I was under the impression that NHD was the
authoritative dataset for waterways in the US.
On Thu, Aug 12, 2010 at 10:46 AM, Nathan Edgars II
<[email protected] <mailto:[email protected]>> wrote:
I'm wondering if anyone has any experience with the
National Wetlands
Inventory: http://www.fws.gov/wetlands/
At first glance it looks like better-quality data than the
NHD for
both wetlands and water.
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