Dataset Open Access
Nilsson, Cecilia; Dokter, Adriaan; Verlinden, Liesbeth; Shamoun-Baranes, Judy; Schmid, Baptiste; Desmet, Peter; Bauer, Silke; Chapman, Jason; Alves, Jose A.; Stepanian, Phillip M.; Sapir, Nir; Wainwright, Charlotte; Boos, Mathieu; Górska, Anna; Menz, Myles H. M.; Rodrigues, Pedro; Leijnse, Hidde; Zehtindjiev, Pavel; Brabant, Robin; Haase, Günther; Weisshaupt, Nadja; Ciach, Michał; Liechti, Felix
This package contains data, filters and visualizations from Nilsson and Dokter et al. (2019).
radar_metadata.csv: Metadata for the 84 European radars considered for this study. Includes radar code (
odim_code_3char and alternative radar code
vp_radar), radar site location (
longitude), radar site elevation (
site_altitude_asl in meters above sea level) and radar altitude range used in this study (
max_height_cut_asl in meters above sea level).
vp.zip: Vertical profiles of birds (vp) data, processed from the radar volume data following procedures described by Dokter et al. (2011), using the vol2bird algorithm in the R package bioRad. Zip file includes vp data for the 84 European radars considered for this study from September 19 to October 9, 2016 (21 days). This time period is characterized by strong passerine migration throughout Europe. Files are organized in radar (=
odim_code), date and hour directories and follow the ODIM bird profile format specification. Data can be read with the R package bioRad.
vp_processing_settings.yaml: Data selection setting for this study, based on data quality criteria. File lists for each radar the altitudes to include (
include_heights), time periods to exclude (
exclude_datetimes) and reasons for exclusion (comments). 70 of the 84 radars were retained after filtering.
vp_processed_70_radars_20160919_20161009.csv: Processed vp data for 70 radars. Is the result of processing
radar_metadata.csv using vp-processing (Desmet & Nilsson 2018). Note: includes all timestamps: day and night & those marked for exclusion (marked in
exclusion_reason). This data file forms the basis for analysis in the study.
radar_id: odim_code of the radar
HGHT: lower altitude of altitude bin (m above sea level)
u: bird ground speed towards east (m/s)
v: bird ground speed towards north (m/s)
dens: bird density (birds/km3)
dd: bird flight direction (degrees from north)
ff: bird ground speed (m/s)
DBZH: reflectivity factor (dBZ) in horizontal polarisation
mtr: migration traffic rate (birds/km/h)
day_night: timestamp occurs during
night(based on sunrise/sunset)
date_of_sunset: date at sunset, with night timestamps between midnight and sunrise belonging to the previous date
exclusion_reason: reason timestamp is excluded in vp_processing_settings.yaml (if applicable). Excluded timestamps have
vp_flowviz.csv: Input data for visualizations. Is the result of processing
vp-to-flowviz.Rmd in vp-processing (Desmet & Nilsson 2018). Aggregates data in hourly bins for 200-2000m (
altitude_band = 1) and above (
altitude_band = 2). Only altitude band 1 is used in visualizations.
flowviz.mov: Screencast of
vp_flowviz.csv visualized with Bird migration flow visualization v2 (Desmet et al. 2016, Shamoun-Baranes et al. 2016). The visualization extrapolates the migration over the entire sampling range (cropped in the screencast due to technical limitations and thus excluding the Bulgarian radar), not taking topography or water bodies into account, and shows the ground speed (length of arrows) and direction of migration over time. Note that density is not shown: low density movements can therefore appear as strong as high density movements when ground speeds are similar.
cartoviz.mov: Screencast of
vp_flowviz.csv visualized as an interactive map with CARTO. Visualization shows migration density (size of circles) and mean direction (colour) over time. The interactive map is available at https://inbo.carto.com/u/lifewatch/builder/8685140f-8d8c-4d06-9e1e-25d051d43748/embed.
Desmet P & Nilsson C (2018) Vertical profiles of birds (vp) data processing v1.0 (Version v1.0). Zenodo. https://doi.org/10.5281/zenodo.1173544
Desmet P, Aelterman B & Azijn K (2016) Bird migration flow visualization v2.0 (Version v2.0). Zenodo. https://doi.org/https://doi.org/10.5281/zenodo.5747
Dokter AM, Liechti F, Stark H, Delobbe L, Tabary P & Holleman I (2011) Bird migration flight altitudes studied by a network of operational weather radars. Journal of the Royal Society Interface 8: 30–43. https://doi.org/10.1098/rsif.2010.0116
Shamoun-Baranes J, Farnsworth A, Aelterman B, Alves JA, Azijn K, Bernstein G, Branco S, Desmet P, Dokter AM, Horton KG, Kelling S, Kelly JF, Leijnse H, Rong J, Sheldon D, Van den Broeck W, Van Den Meersche JK, Van Doren BM & van Gasteren H (2016) Innovative Visualizations Shed Light on Avian Nocturnal Migration. PLOS ONE 11(8): e0160106. https://doi.org/10.1371/journal.pone.0160106