| Title: | Nomadic Pectoral Sandpiper Movement Data |
| Version: | 0.0.1 |
| Description: | Provides satellite tracking data from nomadic pectoral sandpipers published in Kempenaers and Valcu (2017) <doi:10.1038/nature20813>. The data can also serve as benchmark data for clustering movement tracks. |
| License: | CC BY 4.0 |
| Encoding: | UTF-8 |
| RoxygenNote: | 8.0.0 |
| Depends: | R (≥ 4.0) |
| Suggests: | data.table |
| LazyData: | true |
| NeedsCompilation: | no |
| Packaged: | 2026-05-27 14:57:35 UTC; mihai |
| Author: | Mihai Valcu  [aut,
cre],
Bart Kempenaers [ctb] |
| Maintainer: | Mihai Valcu <mvalcu@gwdg.de> |
| Repository: | CRAN |
| Date/Publication: | 2026-05-30 09:00:02 UTC |
nomads: Nomadic Wader Movement Data
Description
Provides satellite tracking data from nomadic pectoral sandpipers.
Author(s)
Maintainer: Mihai Valcu mvalcu@gwdg.de (ORCID)
Authors:
Mihai Valcu mvalcu@gwdg.de (ORCID)
Other contributors:
Bart Kempenaers bart.kempenaers@bi.mpg.de [contributor]
Satellite telemetry locations of male pectoral sandpipers
Description
A processed dataset of Argos satellite telemetry locations for male pectoral sandpipers, Calidris melanotos, tracked during the Arctic breeding season.
Usage
pesa
Format
A data.table with 129536 rows and 7 variables.
If data.table is installed when the dataset is loaded, pesa is returned
as a keyed data.table.
- id
Individual male identifier.
- time
Timestamp of the Argos location fix, as POSIXct in UTC.
- latitude
Latitude in decimal degrees.
- longitude
Longitude in decimal degrees.
- site_id
Residency site identifier. Non-site id points are
NA- locationClass
Argos location class.
Details
Use-sites were identified in the original analysis using
density-based spatial clustering (DBSCAN). This dataset provides a useful
benchmark because the original DBSCAN parameters, \epsilon and
MinPts, were tuned using a subset of males for which the expected
classification was known. Additionally all identified use-sites were
also checked visually, with a small number of manual corrections
applied where needed. See Kempenaers and Valcu (2017)
doi:10.1038/nature20813 for details.
Source
Kempenaers, B. and Valcu, M. (2017). Breeding site sampling across the Arctic by individual males of a polygynous shorebird. Nature. doi:10.1038/nature20813
Data and analysis code were made available at doi:10.17605/OSF.IO/VX2MK under an Open Data Commons Open Database License.
References
Kempenaers, B. and Valcu, M. (2017). Breeding site sampling across the Arctic by individual males of a polygynous shorebird. Nature. doi:10.1038/nature20813
Examples
data(pesa)
head(pesa)
dim(pesa)
names(pesa)
# Number of locations per bird
table(pesa$id)
# Time span covered by the dataset
range(pesa$time)