[Talk-us] US Hydrographic Data
ian.dees at gmail.com
Thu May 1 18:10:30 BST 2008
I e-mailed the folks at the NHD about obtaining all the data for the US in
one chunk. They responded:
We offer full national coverage of the NHD database on DVD. This includes
all medium resolution, and available high resolution NHD. This
is a April 2008 snapshot of the database. We have two versions of national
exports, SDE 9.1, or shapefiles.
ArcSDE 9.1 Exports: 8.6 GB on 2 DVDs, requiring 20 GB of space when
Shapefiles: 17 GB on 5 DVDs, requiring 42 GB of space when unzipped and
I will ask them to send the DVDs and post the data online if we are
interested in uploading it as a dataset.
On Wed, Apr 30, 2008 at 11:24 AM, Ian Dees <ian.dees at gmail.com> wrote:
> It appears that in order to get your data to appear on the FTP site, you
> must first request it via their web extract tool:
> http://nhdgeo.usgs.gov/help/HowTo.html (which is meant to be viewed from
> their tool at http://nhdgeo.usgs.gov/viewer.htm).
> On Wed, Apr 30, 2008 at 10:59 AM, Adam Schreiber <sadam at clemson.edu>
> > On Tue, Apr 29, 2008 at 9:14 PM, Adam Schreiber <sadam at clemson.edu>
> > wrote:
> > > On Tue, Apr 29, 2008 at 6:15 PM, Matthew Perry <perrygeo at gmail.com>
> > wrote:
> > > > Feel free to try it out and let me know how it works. The script
> > is
> > > > available at
> > http://perrygeo.googlecode.com/svn/trunk/gis-bin/nhd_to_osm.py
> > It works very well on my sub-basin, 03060101. I worry about the
> > length of the ways though. If anyone downloads an area adjacent to
> > the lakes in my area, they would be pulling in a rather large way, in
> > this case a closed way. Should large bodies of water be segmented and
> > be joined using a multipolygon relation?
> > Also, for the "holes" created by islands will those be easy to add in
> > later when the script is updated to handle them?
> > Cheers,
> > Adam
> > _______________________________________________
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