Horizontal Time Dependent Positioning

Provides bindings to the National Geodetic Survey (NGS) Horizontal Time Dependent Positioning (HTDP) utility, v3.2.5, written by Richard Snay, Chris Pearson, and Jarir Saleh of NGS. HTDP is a utility that allows users to transform positional coordinates across time and between spatial reference frames. See < https://www.ngs.noaa.gov/TOOLS/Htdp/Htdp.shtml> for more information.


RHTDP provides R bindings to the NGS Horizontal Time-Dependent Positioning utility, v3.2.5, written by Richard Snay, Chris Pearson, and Jarir Saleh of NGS. HTDP allows users to transform positional coordinates across time and between spatial reference frames.

RHTDP is a work-in-progress; currently only crustal displacement and velocity calculations are implemented. Transformations between reference frames are planned, as well as integration with the sp package.

Installation

# Development version from GitHub:
# install.packages("devtools")
devtools::install_github("jbuonagurio/RHTDP")

Usage

Following exercises 1 and 2 in the HTDP User's Guide, the following example estimates the displacement that occurred at point 'beta' during the Loma Prieta earthquake (M=7.1) of October 18, 1989. The NAD_83(2011/CORS96/2007) reference frame is used (iopt=1).

beta <- matrix(data=c(-121.7722, 36.6698), nrow=1)
t0 <- as.Date("1989-10-16")
t1 <- as.Date("1989-10-18")
displace(beta, t0, t1, 1)

R output:

            de         dn           du        ve       vn        vu
1 -0.001449719 0.07401263 -0.004262457 -25.82612 37.15177 -1.329391

HTDP displacement:

 HTDP (VERSION v3.2.5    ) OUTPUT

 DISPLACEMENTS IN METERS RELATIVE TO NAD_83(2011/CORS96/2007)
 FROM 10-16-1989 TO 10-18-1989 (month-day-year)
 FROM 1989.789 TO 1989.795 (decimal years)

NAME OF SITE             LATITUDE          LONGITUDE            NORTH    EAST    UP 
beta                     36 40 11.28000 N  121 46 19.92000 W    0.074  -0.001  -0.004

HTDP velocity:

 HTDP (VERSION v3.2.5    ) OUTPUT

VELOCITIES IN MM/YR RELATIVE TO NAD_83(2011/CORS96/2007)


          beta                    
LATITUDE   =  36 40 11.28000 N  NORTH VELOCITY =  37.15 mm/yr
LONGITUDE  = 121 46 19.92000 W  EAST VELOCITY  = -25.83 mm/yr
ELLIPS. HT. =      0.000 m      UP VELOCITY    =  -1.33 mm/yr
X = -2696934.816 m              X VELOCITY     =  -9.71 mm/yr
Y = -4354426.684 m              Y VELOCITY     =  33.37 mm/yr
Z =  3788064.740 m              Z VELOCITY     =  29.01 mm/yr

Supported values for iopt are below; see the User's Guide for more information. Alternatively, use the iopt() function to list these within R. Note that option 4 (WGS_72) has been removed.

Key Reference Frame
1 NAD_83(2011/CORS96/2007) (North American plate fixed)
2 NAD_83(PA11/PACP00) (Pacific plate fixed)
3 NAD_83(MA11/MARP00) (Mariana plate fixed)
5 WGS_84(transit) (NAD_83(2011) used)
6 WGS_84(G730) (ITRF91 used)
7 WGS_84(G873) (ITRF94 used)
8 WGS_84(G1150) (ITRF2000 used)
9 WGS_84(G1674) (ITRF2008 used)
10 WGS_84(G1762) (IGb08 used)
11 SIO/MIT_92 (ITRF91 used)
12 ITRF88
13 ITRF89
14 ITRF90 or (PNEOS90/NEOS90)
15 ITRF91
16 ITRF92
17 ITRF93
18 ITRF94
19 ITRF96
20 ITRF97 or IGS97
21 ITRF2000 or IGS00/IGb00
22 ITRF2005 or IGS05
23 ITRF2008 or IGS08/IGb08

Warning

HTDP exclusively uses 14-parameter transformations between reference frames. If you require rigorous transformations between various realizations of NAD83, use NADCON/GEOCON/GEOCON11.

Chuck Ghilani of Penn State has an excellent presentation covering the recommended transformation process between different epochs and datums.

News

Reference manual

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install.packages("htdp")

0.1.4 by John Buonagurio, 3 years ago


https://github.com/jbuonagurio/RHTDP


Report a bug at https://github.com/jbuonagurio/RHTDP/issues


Browse source code at https://github.com/cran/htdp


Authors: John Buonagurio [aut, cre] , National Geodetic Survey [cph] (Author of included HTDP code)


Documentation:   PDF Manual  


MIT + file LICENSE license


Imports Rcpp

Linking to Rcpp


See at CRAN