Structuring the skies: Diel dynamics of migratory animal movement in the lower atmosphere - Data 1 (height envelopes and peak times)

Seasonal measures from 143 NEXRAD sites of fights height envelopes and timing of peak migration within 24-hour phases as measured as hour after sunset. Flight height envelopes (containing 50% and 75% of activity) include the envelope starting height (<i>mean_start_height_m</i>), width (<i>mean_envelope_width_m</i>), and ending height (<i>mean_end_height_m</i>). Additionally, we provide the height envelopes calculated for summed traffic across the entire peak activity window (±1SD) per season per season (columns I-K). This approach yields different, albeit correlated, height envelopes and gives a metric for defining entire season passage, rather than the mean of scan-level envelopes (the approach used for the 50% and 75% envelopes in columns C-H). The timing of peak migration is measured in hours after sunset including the mean (<i>mean_peak_hr_after_sunset</i>), median timing (<i>median_peak_hr_after_sunset</i>), and standard deviation (<i>sd_peak_hr_after_sunset</i>).