[Talk-us] National Wetlands Inventory
rjhale at northrivergeographic.com
Thu Aug 12 18:05:31 BST 2010
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..
Randal Hale, GISP
North River Geographic Systems, Inc.
ESRI Business Partner and Authorized Trainer
423.653.3611 rjhale at northrivergeographic.com
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 <sejohnson8 at gmail.com
> <mailto:sejohnson8 at gmail.com>> 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.
> "Wretches, utter wretches, keep your hands from beans." -Empedocles
> On Thu, Aug 12, 2010 at 12:12, Ian Dees <ian.dees at gmail.com
> <mailto:ian.dees at gmail.com>> 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
> <neroute2 at gmail.com <mailto:neroute2 at gmail.com>> 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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