TeachingDemos (version 2.13)

towork: Sample data downloaded and converted from a GPS unit

Description

These are GPS information from 3 trips.

Format

Data frames with the following variables.

Index

Measurement number

Time

a POSIXt, Time of measurement

Elevation

a numeric vector, Elevation in Feet

Leg.Dist

a character/numeric vector, The distance traveled in that leg (in feet for ccc)

Leg.Time

a difftime, the time of that leg

Speed

a numeric vector, Speed in mph

Direction

a numeric vector, Direction in Degrees, 0 is North, 90 is East, 180 is South, 270 is West

LatLon

a character vector, Latitude and Longitude as characters

Leg.Dist.f

a numeric vector, Length of that leg in feet

Leg.Dist.m

a numeric vector, Length of that leg in miles

Lat

a numeric vector, Numeric latitude

Lon

a numeric vector, Numeric longitude (negative for west)

Distance

a numeric vector, Distance from start in feet

Distance.f

a numeric vector, Distance from start in feet

Distance.m

a numeric vector, Distance from start in miles

Time2

a difftime, Time from start

Time3

a difftime, cumsum of Leg.Time

Details

The data frame ccc came from when I was walking back to my office from a meeting and decided to take the scenic route and started the GPS.

The data frame h2h is a trip from my office to another for a meeting. The first part is traveling by car, the last part by foot from the parking lot to the building. Speed is a mixture of distributions.

The data frame towork came from driving to work one morning (the first point is where the GPS got it's first lock, not my house). The overall trip was mostly NorthWest but with enough North and NorthEast that a simple average of direction shows SouthEast, good example for circular stats.

Examples

if( interactive() ){
  with(ccc, TkApprox(Distance, Elevation))
}