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Science Forum Index » Geology - Satellite Navigation Forum » INTRODUCING VERSION 2.9 of HTDP
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| Author |
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| Sam Wormley |
 Posted: Wed Jan 31, 2007 9:07 pm |
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Guest
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January 29, 2007
INTRODUCING VERSION 2.9 of HTDP
NOAA's National Geodetic Survey recently released version 2.9 of the
HTDP (Horizontal Time-Dependent Positioning) software for transforming
positional coordinates and/or geodetic observations across time and
between spatial reference frames. Users may also apply HTDP to predict
the velocities and displacements associated with crustal motion in any
of several popular reference frames.
Version 2.9 expands the list of permissible reference frames to include
ITRF2005 and IGS05. The International Earth Rotation and Reference
System Service (IERS) released ITRF2005 in September 2006, and the
International Global Navigation Satellite System Service (IGS) released
IGS05 shortly thereafter.
Version 2.9 also introduces dislocation models for two recent
earthquakes: (1) the magnitude 6.5 San Simeon, CA earthquake that
occurred in December 2003, and (2) the magnitude 6.0 Parkfield, CA
earthquake that occurred in October 2004. Both dislocation models were
developed by Ingrid Johanson and her colleagues at the University of
California at Berkeley. Chris Pearson of the National Geodetic Survey
converted these models into the format used by the HTDP software. Mike
Potterfield of Geodetic Solutions provided critical data for developing
the model for the San Simeon earthquake. For creating the NAD_83 (NSRS
2007) reference frame, Dale Pursell of the National Geodetic Survey
applied a prerelease copy of HTDP (Version 2.9) to update relevant GPS
observations performed in California from their respective dates of
observation to the values that would have been observed on January 1,
2007.
Users may execute HTDP (Version 2.9) interactively at
http://www.ngs.noaa.gov
by clicking their mouse on "geodetic tool kit" and then on "HTDP."
Users may also download the HTDP software and related information from
this web site. |
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