Example with shaded urban Example with shaded urban area: Davis, Californiaarea: Davis, California

Linear extentLinear extent-- Defined as Defined as the distance from the the distance from the geographic center of the geographic center of the location to the furthest point location to the furthest point of the geographic extent of of the geographic extent of the location.the location.

Locality Types: Named PlaceLocality Types: Named PlaceNamed PlaceNamed Place – Used to refer to traditional and non-traditional features – Used to refer to traditional and non-traditional features (towns, cities, mountains, ranches, highway mile markers, townships, (towns, cities, mountains, ranches, highway mile markers, townships, intersections). Use geographic center for the coordinates. intersections). Use geographic center for the coordinates.

Example: Jean, NevadaExample: Jean, Nevada

Named PlaceNamed Place – Small town – Small town

Named Place – RemoteNamed Place – Remote

A locality that does not have a clear boundary on the map. A locality that does not have a clear boundary on the map.

Olancha, Olancha,

CaliforniaCalifornia

Extent is Extent is half the half the distance to distance to the center of the center of the next the next nearest nearest named named place place (or feature), (or feature), which is which is Grant, CA.Grant, CA.

Named Place – JunctionNamed Place – JunctionJunction of Hwy 80 and Hwy 9, Hidalgo, New MexicoJunction of Hwy 80 and Hwy 9, Hidalgo, New Mexico

Measure the extent of the junction as if it were a named place. Use the Measure the extent of the junction as if it were a named place. Use the following standards for extent: following standards for extent:

10 m for two lane city street or highway, 10 m for two lane city street or highway, 20 m for four lane highway20 m for four lane highway30 m for large highways with medians30 m for large highways with medians

Distance from a Distance from a named place using named place using the center of the the center of the named place as a named place as a starting point. Used starting point. Used with a heading to with a heading to give direction and give direction and distance from distance from named place.named place.

These can be with These can be with a direction, direction a direction, direction and distance, and distance, direction along a direction along a path, etc.path, etc.

Offsets:Offsets: ““5 miles north of Beatty, on US 95”5 miles north of Beatty, on US 95”

Locality Types: Offsets by roadLocality Types: Offsets by road

Error is smaller for by road than by air (5.261 miles), as there is Error is smaller for by road than by air (5.261 miles), as there is no error in direction for offsets by road.no error in direction for offsets by road.

Comparing OffsetsComparing Offsets