PPT Slide

? Transforms positions and velocities between spatial reference frames [ITRFxx, WGS84 (G873), NAD 83]

? Updates positions and/or observations between dates (epochs)

? Predicts velocities due to crustal motion

? Predicts displacements between dates

? Transforms positions between the ITRF97 frame and the NAD 83 datum using 14 parameters

Horizontal Time-Dependent Positioning Software (HTDP)

http://www.ngs.noaa.gov/TOOLS/Htdp/Htdp.html

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