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•  Upcoming Events  •  NGS In The News  •
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Online Adjustment User Services
This new addition to the Geodetic Toolkit allows users to submit their data to NGS and have it processed by the popular ADJUST software that performs a least squares adjustment on horizontal, vertical angle, and/or GPS observations. The utilities includes data checking programs.
Mapping the Ionosphere: Modelling the uppermost layers of the earth's atmosphere is an essential component for accurate and rapid GPS positioning... more
The National Readjustment
NGS plans the readjustment of horizontal positions and ellipsoid heights for GPS stations in the contiguous United States. A new cutoff date for submittal of projects is announced
Lewis And Clark Bicentennial:  To honor Lewis and Clark's contributions to mapping, NGS is installing a series of commemorative markers along the route that Lewis and Clark traveled.

Upcoming Height Modernization Events

National Ocean Service News Feature: Height Modernization Provides Safer Transportation.

NEW!  NGS Height Modernization web page.
Project Proposals: Data and advice to help you plan your geodetic control surveys.
VDatum Utility: VDatum is a tool for the conversion of elevation data among 28 different vertical datums... more
State Population Centers: NGS encourages each state to set a commemorative geodetic control monument at the location of its population center as determined by the 2000 U.S. Census.
NOAA Shoreline Data Explorer provides access to the NGS Vector Shoreline Data Base... more
Mark Recovery Entry Form: Submit information on the condition of survey markers in the National Spatial Reference System through this web site.  [ Go directly to the form]
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Date Last Updated: November 15, 2004