GEOID09

Last update 2010/01/29

GEOID09 is a refined hybrid model of the geoid
in the United States and other territories,
which supersedes the previous models
GEOID06, GEOID03, GEOID99, GEOID96, GEOID93, and GEOID90.

For GEOID09 in CONUS regions, heights range
from a low of -50.68 meters (magenta) in the Atlantic Ocean
to a high of 3.44 meters (red) in the Labrador Strait.
However, these geoid heights are only reliable within CONUS
due to the limited extents of the data used to compute it.

This model is intended
FOR CONVERTING BETWEEN NAD83 and NAVD88 ONLY.

For reference only, model GEOID09BETA is available

Data
• Interactive GEOID09 computations
• Download GEOID09 Files

Information
• The Official NGS GEOID Page
• Readme file for GEOID09
• Technical details
• Geophysics of the Geoid
• On-Line Papers
• The Geoid Research Page
• Acknowledgements
• FAQ

Related Pages
• USGG2009
• USGG2003
• GEOID03
• DEFLEC09
• GPS/bench mark data set for GEOID09

Have a geoid question?
• Contact the Geoid Team