next_lat_long

Given a current location (latitude and longitude), speed, direction (in radians), and time elapsed (in seconds),
this function calculates the next latitude and longitude. The calculations are based on the assumption of a constant
speed and direction during the elapsed time.

Process GPS and accelerometry data to generate walk bouts. A walk bout is a period of activity with accelerometer movement matching the patterns of walking with corresponding GPS measurements that confirm travel. The inputs of the 'walkboutr' package are individual-level accelerometry and GPS data. The outputs of the model are walk bouts with corresponding times, duration, and summary statistics on the sample population, which collapse all personally identifying information. These bouts can be used to measure walking both as an outcome of a change to the built environment or as a predictor of health outcomes such as a cardioprotective behavior. Kang B, Moudon AV, Hurvitz PM, Saelens BE (2017) <doi:10.1016/j.trd.2017.09.026>.

Lauren Blair Wilner

walkboutr

Generate Walk Bouts from GPS and Accelerometry Data

Stephen J Mooney

next_lat_long function

<dl><dt>latitude</dt>
<dd>The current latitude in decimal degrees.</dd>
<dt>longitude</dt>
<dd>The current longitude in decimal degrees.</dd>
<dt>speed</dt>
<dd>The speed in kilometers per hour.</dd>
<dt>direction</dt>
<dd>The direction of movement in radians from due north (0 radians).</dd>
<dt>dt</dt>
<dd>The elapsed time in seconds.</dd></dl>

Arguments

Calculate next latitude and longitude based on current location, speed, direction, and time elapsed. — next_lat_long

<dl>

<dt>latitude</dt>
<dd>The current latitude in decimal degrees.</dd>


<dt>longitude</dt>
<dd>The current longitude in decimal degrees.</dd>


<dt>speed</dt>
<dd>The speed in kilometers per hour.</dd>


<dt>direction</dt>
<dd>The direction of movement in radians from due north (0 radians).</dd>


<dt>dt</dt>
<dd>The elapsed time in seconds.</dd>

</dl>

next_lat_long: Calculate next latitude and longitude based on current location, speed, direction, and time elapsed.

Description

Usage

Value

Arguments