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Find “1”, Get “1”, Use “1”

Find “1”, Get “1”, Use “1”

National Atlas Delivers New Million-Scale Digital Map Data

What’s “1”?  It’s the new set of digital cartographic frameworks from The National Atlas of the United States of America®. Prepared at one million-scale (where an inch on a map is nearly 16 miles) this authoritative and integrated national dataset has twice the detail of previous versions.  Users can now easily find “one” using popular search engines or portals like Data.Gov; get it as documented data or Web map services from and other sources; and use “one” in their geospatial analyses, maps, or map mashups.

This is the first time the Federal government has ever released these basic digital map themes at 1:1,000,000-scale:

  • Boundaries (national, state, and county)
  • Transportation (roads, railroad, railroad stations, airports, and ports)
  • Surface waters (coastlines, streams, gaging stations, waterbodies, and wetlands, all fully networked)
  • Cities and towns

This new release serves as the foundation for small-scale maps and datasets on the Nation’s people, heritage, and resources. The new map data is delivered at no cost and is available on-line as a web map service from

“For more than 130 years the USGS has been the ‘go to’ source for quality maps and authoritative map content,” said USGS Director Marcia McNutt. “The new million-scale digital series continues this proud tradition, providing users with multi-million uses only limited by their imaginations.”

By moving to one million-scale, the National Atlas achieves two goals to better serve national and international audiences.  First, map features have been harmonized at the U.S. borders of Canada and Mexico with data from national mapping programs in those nations for use in the Environmental Atlas of North America.  Also, a second edition of the data that conforms to the specifications of the Global Map is ready.  Global Map is an international effort by government mapping organizations to make a consistent map of the world at one million-scale                                                                                                              

Future releases are scheduled to include:  Federal and Native American lands, Congressional Districts, U.S. Statistical areas and more.

The National Atlas of the United States® is a cooperative effort to make geographic information collected by the United States government easier to find, get, and use.  Its development is led by the U.S. Geological Survey.

For further information, visit the National Atlas website.

USGS Newsroom

More information

Parameter Value Description
Magnitude mb The magnitude for the event.
Longitude ° East Decimal degrees longitude. Negative values for western longitudes.
Latitude ° North Decimal degrees latitude. Negative values for southern latitudes.
Depth km Depth of the event in kilometers.
Place Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 1970-01-01 00:00:00 Time when the event occurred. UTC/GMT
Updated 1970-01-01 00:00:00 Time when the event was most recently updated. UTC/GMT
Timezone offset Timezone offset from UTC in minutes at the event epicenter.
Felt The total number of felt reports
CDI The maximum reported intensity for the event.
MMI The maximum estimated instrumental intensity for the event.
Alert Level The alert level from the PAGER earthquake impact scale. Green, Yellow, Orange or Red.
Review Status Indicates whether the event has been reviewed by a human.
Tsunami This flag is set to "1" for large events in oceanic regions and "0" otherwise. The existence or value of this flag does not indicate if a tsunami actually did or will exist.
SIG A number describing how significant the event is. Larger numbers indicate a more significant event.
Network The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources A comma-separated list of network contributors.
Number of Stations Used The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type The method or algorithm used to calculate the preferred magnitude for the event.
Event Type Type of seismic event.
Event ID Id of event.
Event Code An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS A comma-separated list of event ids that are associated to an event.

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