Extracting Migrant Flight Orientation Profiles Using Polarimetric Radar

Stepanian, Phillip M.; Horton, Kyle G.

doi:10.1109/tgrs.2015.2443131

Cited by 36 publications

(35 citation statements)

References 26 publications

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“…We used the WSRLIB package (Sheldon ) to determine migrant track (flight direction with respect to the ground) and heading (orientation of body axis) from radial velocity and correlation coefficient (ρ HV ), respectively, from 55 to 1995 m above ground level (a.g.l.) following Browning & Wexler () and Stepanian & Horton (). When necessary, radial velocity measures were dealiased following Sheldon et al .…”

Section: Methodsmentioning

confidence: 99%

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Navigating north: how body mass and winds shape avian flight behaviours across a North American migratory flyway

et al. 2018

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The migratory patterns of birds have been the focus of ecologists for millennia. What behavioural traits underlie these remarkably consistent movements? Addressing this question is central to advancing our understanding of migratory flight strategies and requires the integration of information across levels of biological organisation, e.g. species to communities. Here, we combine species-specific observations from the eBird citizen-science database with observations aggregated from weather surveillance radars during spring migration in central North America. Our results confirm a core prediction of migration theory at an unprecedented national scale: body mass predicts variation in flight strategies across latitudes, with larger-bodied species flying faster and compensating more for wind drift. We also find evidence that migrants travelling northward earlier in the spring increasingly compensate for wind drift at higher latitudes. This integration of information across biological scales provides new insight into patterns and determinants of broad-scale flight strategies of migratory birds.

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Section: Methodsmentioning

confidence: 99%

“…). We restricted polarimetric azimuth displays (a computation of the correlation coefficient, ρ HV , to derive heading) to fits with > 15% of the variance explained (when fitting ρ HV to a sinusoid) and an average standard deviation in heading direction that was < 20° (Stepanian & Horton ; Horton et al . ).…”

Section: Methodsmentioning

confidence: 99%

Navigating north: how body mass and winds shape avian flight behaviours across a North American migratory flyway

et al. 2018

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“…There is a substantial literature on the use of radar for studying migration and other aspects of aeroecology that spans 70 years (Lack & Varley, 1945;Horton et al, 2016). In addition the added potential of the national upgrade to dual-polarization is only now being explored (Stepanian & Horton, 2015). In addition the added potential of the national upgrade to dual-polarization is only now being explored (Stepanian & Horton, 2015).…”

Section: More Knowledge From Fewer Datamentioning

confidence: 99%

Toward a predictive macrosystems framework for migration ecology

Kelly

Horton

Sykes³

2016

Global Ecol. Biogeogr.

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Concern about the sustainability of intercontinental‐scale migration systems grows apace with global change. Traditional organism‐centred approaches to this problem have provided insights at the population level, but not at the systems level. We are sceptical that an accumulation of data from a species‐by‐species approach will yield an understanding of these systems in the near term. As an alternative, we advocate a new research programme that grows from an explicitly system‐based framework that leverages existing Earth observation infrastructure to make inferences directly at the macrosystem level. We illustrate how this approach can be used to generate and test system‐level predictions, using NEXRAD radar data as an example. We urge organismal ecologists to recognize that some of the most urgent migration questions are at the macrosystem scale and that tackling these questions requires an interdisciplinary approach if we are to make progress at a pace that exceeds that of climate change.

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“…The characteristics of birds and insects are presented in [16]- [19]. Besides, [20] demonstrates the effectiveness of the image processing techniques together This is an Accepted Manuscript of an article published by IEEE in IEEE Transactions on Geoscience and Remote Sensing, available online: https://doi.org/10.1109/TGRS.2017.2696263…”

Section: Introductionmentioning

confidence: 96%

Narrow-Band Clutter Mitigation in Spectral Polarimetric Weather Radar

Yin

Unal

Russchenberg

2017

IEEE Trans. Geosci. Remote Sensing

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Abstract-In this paper, a new clutter suppression method named the moving double spectral linear depolarization ratio (MDsLDR) filter is put forward to mitigate narrow-band clutter in weather radars. The narrow-band clutter observed in the Doppler domain includes: 1) stationary clutter such as ground clutter and 2) non-stationary clutter such as artifacts caused by the radar system itself or external sources. These artifacts are difficult to remove because they are not confined to specific azimuth and range bins. Based on the difference of the spectralpolarization feature and the spectral continuity of precipitation and clutter, MDsLDR filter can remove ground clutter, artifacts and noise. The performance of the newly proposed filter is assessed by data collected by the Doppler-polarimetric IRCTR Drizzle Radar (IDRA). Three precipitation cases are considered in this paper: moderate/light precipitation, convective precipitation with hook-echo signature and light precipitation with severe artifact contamination. Furthermore, the implementation of the MDsDLR filter requires relatively low computation complexity, so that the MDsLDR filter can be operated in real time.

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Extracting Migrant Flight Orientation Profiles Using Polarimetric Radar

Cited by 36 publications

References 26 publications

Navigating north: how body mass and winds shape avian flight behaviours across a North American migratory flyway

Navigating north: how body mass and winds shape avian flight behaviours across a North American migratory flyway

Toward a predictive macrosystems framework for migration ecology

Narrow-Band Clutter Mitigation in Spectral Polarimetric Weather Radar

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