[Talk-us] NOAA Composite Shoreline

Josh Doe josh at joshdoe.com
Thu Jul 14 15:46:30 BST 2011


On Wed, Jul 13, 2011 at 4:07 PM, TC Haddad <tchaddad at gmail.com> wrote:

> As with everything, proceed with caution. The metadata for that layer
> states:
>
> "These data were automated to provide a suitable geographic
> information system (GIS) data layer depicting the historical shoreline
> for the United States. These data are derived from shoreline data that
> were produced by the NOAA National Ocean Service including its
> predecessor agencies"
>
> Checking it against other shorelines in my area (Oregon coast) shows
> that most of the river mouths are depicted in this layer before they
> had jetties, and areas of high erosion/accretion are substantially
> different. Also in one location (-124.286565  42.042545) it is showing
> an ocean pier that absolutely does not exist today. One nice thing is
> that it has a field called "SURVEYDATE" that reports that that
> particular part of the composite shoreline dates from 01/01/1928....
> so I'd pay attention to that field if you're wondering about if the
> data is worth the effort for your area...
>

Certainly, it must be compared for each region against what's in OSM, other
shoreline data, aerial imagery, survey, etc. I'm thinking the state or even
the individual counties might have the best, most accurate and up-to-date
data, so I'm checking with them.

-Josh
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