Functions for estimating and assigning the User Equivalent Range Error (UERE) of a GPS device from calibration data.
1 2 3
Telemetry object or list of telemetry objects, preferably with DOP columns.
Return a UERE estimate even for data that are calibrated.
Consider HDOP and VDOP as being specified by the same UERE value.
Return extra details, such as the UERE's 95% confidence interval and a plot.
UERE value(s) to assign to telemetry data (see details).
Often times GPS animal tracking devices return HDOP values but do not specifiy the device's UERE necessary to transform the HDOP values into absolute errors.
uere() allows users to estimate the UERE from calibration data, where the device was left fixed over a period of time.
ctmm.fit will estimate the UERE simultaneously with the movement model, which is less reliable than using calibration data.
The calibration UERE can then be applied to tracking data during import, with
as.telemetry, or after import with the
uere()<- assignment method.
Ideally, device HDOP and VDOP values are scaled to the same UERE.
However, in many cases not all DOP values are supplied and some must be approximated.
In such cases, different UERE values need to be estimated for each set of DOP values, via the
axes argument of
c combination of properly named UERE values can then be used in assignment via
Proper names include
The UERE estimate.
The GPS device should be fixed during calibraiton.
C. H. Fleming
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.