INTRODUCING VERSION 3.0 of the HTDP SOFTWARE
NOAA’s National Geodetic Survey recently released version 3.0
of the Horizontal Time-Dependent Positioning (HTDP3.0) software for
transforming positional coordinates and/or geodetic observations across
time and between spatial reference frames. Users may also
apply HTDP3.0 to predict velocities and displacements associated with
crustal motion in any of several popular reference frames; including
NAD 83, WGS 84, and ITRF.
HTDP3.0 introduces a new model for horizontal crustal velocities across
western CONUS within the region bounded in latitude by 31ºN
and 49ºN and in longitude by 100ºW and
125ºW. Developed by Dr. Robert McCaffrey, this
velocity model represents western CONUS as a collection of elastic,
rotating crustal blocks that are separated by geologic
faults. Dr. McCaffrey used 4,890 GPS-derived horizontal
velocities, 170 fault slip rates, and 258 fault slip vectors to
estimate various model parameters (block motion, internal block
deformation, and fault slip rates).
HTDP3.0 also introduces a model for the displacements associated with
the magnitude 7.9 Denali earthquake that devastated central Alaska on
November 3, 2002. This earthquake model was developed by
researchers at the University of Alaska at Fairbanks.
Users may execute HTDP3.0 interactively at http://www.ngs.noaa.gov/TOOLS/Htdp/Htdp.shtml.
Users may also download the HTDP software, the HTDP User Guide, and
other related information from this web site.
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Last updated by ngs.webmaster
on Monday, 19-May-2008 10:42:11 EDT
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