[gis_info] Rivers GIS data question

Erik Fernandez ef at oregonwild.org
Mon Nov 2 15:40:50 PST 2009


Thanks to all those who responded, very much appreciated.  Here's what I
heard back from a handful of folks.
Pretty much everyone pointed me toward the NHD
website<http://nhd.usgs.gov/>and data. While it's not a straight
forward download (you need to select
your area of interest/scope) it sounds like this will be the new standard
and is the one being regularly updated and maintained.

However, an easy work around was also suggested which is to just use
definition query to only select named rivers... for example:
"name" NOT LIKE ''
note: last quotation is actually two apostrophes with no space in between.
This creates a data set showing all named streams which functionally hides
all small tributaries without having to use a 1:100k accuracy layer.

If you want even more potential refinement it sounds like there are ways to
generalize the NHD data using flowline thinning.

Thanks again,
Erik


-- 
Erik Fernandez
Wilderness Coordinator
Oregon Wild, formerly ONRC
(503) 283-6343 x202

Protecting and restoring Oregon's wildlands, wildlife, and waters since
1974. Donate today at www.oregonwild.org!
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