Geodetic Toolkit: HTDP

HTDP - Horizontal Time-Dependent Positioning

HTDP is a utility that allows users to transform positional coordinates across time and between spatial reference frames.

Interactive Computations (using HTDP version 3.2.3):

• Interactively estimate horizontal velocities.
• Interactively estimate horizontal displacements between two dates.
• Interactively update positions and/or observations to a specified date.
• Interactively transform positions between reference frames and/or dates.
• Interactively transform velocities between reference frames.

More Info:

• View User's Guide [ pdf format ] and/or Revision Log  [ pdf format ]
• Download a Zip'ed (md5 813d003503a5dc680c9b2483576fd2b7) archive of the HTDP Fortran-90 source code, the User's Guide, Revision Log, and some sample data files
• This archive also contains the HTDP executable code, which should work on most computers having a recent Windows operating system.
• Relevant publications

Maps of Horizontal Velocities:

Horizontal velocities in western & eastern CONUS relative to the NAD_83(2011) realization of the North American Datum of 1983.

The green lines identify where each of the velocity models takes precedence.

Horizontal velocities in Alaska relative to the NAD_83(2011) realization of the North American Datum of 1983.

For more information, or to comment on this Web Page, contact NGS at ngs.cors.htdp@noaa.gov.

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