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We recently published a review paper on 58 R packages created to process or analyze tracking data. However, R packages are dynamic, new packages are created, old packages get updated and some even disappear or get deprecated due to lack of maintenance. For that reason, we created a CRAN Task View (CTV) on tracking packages.


In this new post from the sftraj series, we now present a detailed conceptual model for movement, from the basic location to a complete trajectory. Essentially, this is the logics behind sftraj.


“There is a raccoon that looks stuck on the gate… his head is stuck in a can… Any chance you know what to do in this situation? (pic attached).” Talk about a weird email to receive first thing in the morning, coffee in hand, as I arrived at the UF Fort Lauderdale Research and Education Center, in Davie, FL. Curious, I opened the attachment to see what appears to be a young raccoon hanging on for dear life at the top of a chain-link fence with an aluminum soup can firmly stuck around its head like a Halloween costume gone wrong.


We now have a problem, a team, and use cases to consider for our sftraj package. In order to be relevant, we also need to know what does already exist in R, what other projects have attempted to deal with trajectories and tracking data, and what lessons can we learn from this. In this post of the sftraj series, we thus review the state of affairs in the R world.


After introducing the problem and our team in the previous blog post, we now present in this second post of the ‘sftraj’ series a brief overview of the sftraj package as projected, and how we will work to implement it. Most importantly, we also ask your help, and explain how you (developers and users!) can contribute to the success of sftraj.




Research project on raccoon home ranges and ecological flows

Wood Storks

Research project on Wood Stork movement ecology.

Movement Ecology

Movement Ecology research developed by the Mablab


Development of packages and resources for R.


Navigation of seabirds on the vast ocean, and the role of infrasound

Project BioBlitz

BioBlitzes: Citizen-science biodiversity surveys.


Romain Dejeante

Romain is a master student who studies the effect of urban area on spatial patterns of raccoons.

Jenicca Poongavanan

Jenicca started her Master’s research working with movement models, specifically on seabirds.

Matt Boone

Matt is the Biological Scientist and data manager for the lab, and leads all citizen-science activities.

Valeria Guerrero

Valeria was an intern in charge of updating the Raccoon Ecology Database in 2018.

Rocío Joo

Rocío is a postdoctoral research associate who started in 2018, as a movement statistician.

Caitlin Jarvis

Caitlin was a technician working on the Raccoon project in 2017–2018.

Mel Moreno

Mel was an Intern working on creating beautiful maps in 2017.

Alexis Bruant

Alexis did his Master thesis on Wood Storks reproductive success in 2017.

Balázs Dukai

Balázs worked as a Google Summer of Code student in 2016 and 2017.

Simona Picardi

Simona defended her PhD on wood stork movement ecology in 2019, focusing on migration strategies and their fitness consequences.

David Bucklin

David was the Biological Scientist in the lab from 2015 to 2017.

Recent Publications

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(2019). Navigating through the R packages for movement. JAE.

PDF URL Preprint

(2018). Movement responses of roe deer to hunting risk. J. Wildl. Manag..


Recent Talks

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Introducing sftrack: A framework for movement data in R
Aug 3, 2020 12:00 AM
Replicability and Reproducibility in Movement Ecology
Aug 3, 2020 12:00 AM
Successes and failures of movement ecology
Aug 3, 2020 12:00 AM
Trash pandas in their natural environment — Or how raccoons use and abuse human trash
Aug 3, 2020 12:00 AM
sftrack, a R package for movement data
Mar 11, 2020 3:00 PM
How Citizen Scientists are Contributing to Science
Nov 21, 2019 6:30 PM
Endangered Species of Florida in the Face of Climate Change
Nov 15, 2019 3:00 PM
Wood Storks, from Everglades birds to urban dwellers
Oct 24, 2019 6:30 PM
Raccoons and their pathogens
Sep 17, 2019 6:00 PM