pf_sda_filter: Use 'sda' to identify extreme locations

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

Use sda to identify extreme locations

Description

Use sda to identify extreme locations

Usage

pf_sda_filter(x, spdf, vmax, ang, distlim)

Arguments

x	data from pf_obs_type()
spdf	turn speed filter on/off (logical; default is TRUE)
vmax	max travel rate (m/s)
ang	angles of outlier location "spikes" (default is c(15,25) deg); ang = NA turns off sda filter in favour of speedfilter
distlim	lengths of outlier location "spikes" in km (default is c(2.5, 5) m); distlim = NA turns off sda filter in favour of speedfilter. Either ang = NA or distlim = NA are sufficient.

Details

sda is a vectorized implementation of the Argos filter presented in Freitas et al. (2008) Mar Mamm Sci 24:315-325. This function checks for errors returned by sda and falls back to using the simpler speedfilter if an error is returned. Both sda and speedfilter are native implementations of those from the trip package (MD Sumner: https://github.com/Trackage/trip).

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