sda_int: sda_int: filter track for speed, distance and angle.

In ianjonsen/foieGras: Fit Continuous-Time State-Space and Latent Variable Models for Quality Control of Argos Satellite (and Other) Telemetry Data and for Estimating Changes in Animal Movement

sda_int: filter track for speed, distance and angle.

Description

Create a filter index of a track for "bad" points with a combination of speed, distance and angle tests.

Usage

sda_int(x, smax, ang = c(15, 25), distlim = c(2.5, 5))

Arguments

x	fG_format object passed from pf_obs_type()
smax	maximum speed, in km/h
ang	minimum turning angle/s in degrees
distlim	maximum step lengths in km

Details

This is an implementation based on that in the package trip by MD Sumner (https://github.com/Trackage/trip).

Value

logical vector, with FALSE values where the tests failed

References

Freitas, C., Lydersen, C., Fedak, M. A. and Kovacs, K. M. (2008), A simple new algorithm to filter marine mammal Argos locations. Marine Mammal Science, 24: 315?V325. doi: 10.1111/j.1748-7692.2007.00180.x

ianjonsen/foieGras documentation built on Jan. 17, 2025, 11:15 p.m.