displace: Estimate horizontal displacement and velocity between two...

In htdp: Horizontal Time Dependent Positioning

Description

Returns an R data.frame containing the crustal displacement in meters and velocity in mm/yr at a specified location from time t1 to time t2. The estimated displacement equals the velocity at this location multiplied by the time difference (t2 - t1) plus all coseismic and postseismic motion that has occurred between these two times.

Usage

displace(xy, t0, t1, iopt)

Arguments

xy	A matrix of longitude and latitude coordinates in decimal degrees
t0	The starting date
t1	The ending date
iopt	The key identifying the reference frame for the input values. See iopt for a list of supported values.

Value

A data.frame with 6 columns:

de	Eastward displacement (meters)
dn	Northward displacement (meters)
du	Upward displacement (meters)
ve	Eastward velocity (mm/yr)
vn	Northward velocity (mm/yr)
vu	Upward velocity (mm/yr)

See Also

iopt

Examples

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)

htdp documentation built on May 2, 2019, 3:41 p.m.