[Realtime-feed-users] Help understanding difference in location description between Atom title and CAP headline

[Fee, Jeremy]

CAP alerts are generated by an older system that still uses Flynn-Engdahl
region names.  Our newer systems use cities from geonames.org .

We plan to update our CAP alert generator, but currently have other
priorities.  CAP alerts will eventually use the same information displayed
by the ATOM and other feeds on this page:

http://earthquake.usgs.gov/earthquakes/feed/v1.0/



The format that provides access to all event information as it was
contributed, including CAP alerts, is the GeoJSON detail feed:

http://earthquake.usgs.gov/earthquakes/feed/v1.0/geojson_detail.php


Links to GeoJSON detail feeds are included as a "detail" feature property
in GeoJSON summary feeds.


Thanks,

Jeremy


On Mon, May 4, 2015 at 1:25 PM, Fee, Jeremy <jmfee at usgs.gov> wrote:

> Forwarding to the realtime-feed-users list, realtime-feeds is only for
> announcements.
>
>
> From: Steve Hakusa
> Date: Mon, 4 May 2015 13:17:12 -0400
>
> Hi,
>
> I'm looking to understand the difference between the location reported in
> the Atom feed entry title vs that reported in the attached CAP alert
> headline.
>
> It appears that the Atom title is an approximation of the epicenter
> location, represented in kilometers from the nearest large-ish city, and
> the CAP headline is a (frequently different) nearby city.
>
> 1. Can you explain how the cities are chosen in each case?
> 2. Is there a reason that the two are different?
>
> The CAP headlines look somewhat inaccurate when the earthquake is far out
> to sea and the closest city is hundreds of kilometers away.
>
> Here are a few examples, pulled from
> http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/4.5_week.atom currently
> lists
>
> <entry>
> <id>urn:earthquake-usgs-gov:us:20002b5q</id>
> <title>M 4.9 - *103km SSE of Iranshahr, Iran*</title>
> <updated>2015-05-04T11:49:33.310Z</updated>
> <link rel="alternate" type="text/html" href="
> http://earthquake.usgs.gov/earthquakes/eventpage/us20002b5q"/>
> <link rel="alternate" type="application/cap+xml" href="
> http://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/us20002b5q.cap"/>
>
> vs us20002b5q.cap
>
> <headline>EQ 4.9 *Chabahar, Iran* - PRELIMINARY REPORT</headline>
>
> Similarly:
>
> <entry>
> <id>urn:earthquake-usgs-gov:us:20002b3h</id>
> <title>M 4.7 - *64km S of Pirgos, Greece*</title>
> <updated>2015-05-04T12:11:39.421Z</updated>
> <link rel="alternate" type="text/html" href="
> http://earthquake.usgs.gov/earthquakes/eventpage/us20002b3h"/>
> <link rel="alternate" type="application/cap+xml" href="
> http://earthquake.usgs.gov/earthquakes/feed/v1.0/detail/us20002b3h.cap"/>
>
> vs us20002b3h.cap
>
> <headline>EQ 4.7 *Iraklion, Crete, Greece* - PRELIMINARY REPORT</headline>
>
>
> Thanks!
> Steve
>
>
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