Talk:How to Design Programs
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Our title should match the book's title, not an abbreviation.
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- Moved. --Bob Mellish 18:03, 20 December 2005 (UTC)
[edit] HTDP - Horizontal Time Dependent Positioning
Horizontal velocities across the Western United States. Colors specify speed in mm/yr and arrows specify corresponding directions of motion relative to a fixed North American plate reference frame.
The HTDP software enables users to predict horizontal displacements and/or horizontal velocities related to crustal motion in the United States and its territories. The software also enables users to update positional coordinates and/or geodetic observations to a user-specified date. HTDP supports these activities for coordinates in the North American Datum of 1983 (NAD_83) as well as in all official realizations of the International Terrestrial Reference Frame (ITRF),and all official realizations of the World Geodetic System of 1984 (WGS_84). Hence this software may be used to transform geodetic coordinates between any pair of these reference frames in a manner that rigorously addresses differences among the definitions of their respective velocity fields.
The software employs models that address both the continuous and the episodic components of crustal motion. For characterizing continuous motion, the models assume that points on the Earth's surface move with constant horizontal velocities. This assumption is generally acceptable except for the accelerated motion experienced during the years immediately following a major earthquake and for the motion associated with volcanic/magmatic activity. For characterizing the episodic motion associated with earthquakes, the models use the equations of dislocation theory.
More Info: View User's Guide and/or Revision Log Using the HTDP Software to Transform Spatial Coordinates Across Time and Between Reference Frames by Richard A. Snay [ pdf format ] Download a Zip'ed archive of the HTDP FORTRAN-77 source code, the User's Guide, Revision Log, a PC-executable and some sample data files Interactive Computations (using htdp version 2.9): Interactively predict displacements between two dates. Interactively predict velocities. Interactively update positions and/or observations to a specified date. Interactively transform positions between reference frames. Interactively transform velocities between reference frames.
See the PDF version of an article about HTDP that appeared in the Professional Surveyor magazine, November 2003 Volume 23, Number 11 —Preceding unsigned comment added by StrangerD (talk • contribs) 08:20, 31 October 2007 (UTC)
