Papers by claudia pittiglio
PloS one, 2018
The wild boar is an important crop raider as well as a reservoir and agent of spread of swine dis... more The wild boar is an important crop raider as well as a reservoir and agent of spread of swine diseases. Due to increasing densities and expanding ranges worldwide, the related economic losses in livestock and agricultural sectors are significant and on the rise. Its management and control would strongly benefit from accurate and detailed spatial information on species distribution and abundance, which are often available only for small areas. Data are commonly available at aggregated administrative units with little or no information about the distribution of the species within the unit. In this paper, a four-step geostatistical downscaling approach is presented and used to disaggregate wild boar population density statistics from administrative units of different shape and size (polygons) to 5 km resolution raster maps by incorporating auxiliary fine scale environmental variables. 1) First a stratification method was used to define homogeneous bioclimatic regions for the analysis; ...
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International Journal of Remote Sensing, Jun 28, 2011
ABSTRACT In this article we investigate the scale dependence of spatial heterogeneity in multires... more ABSTRACT In this article we investigate the scale dependence of spatial heterogeneity in multiresolution and multisensor data using the wavelet transform. The landscape analysed with the wavelets retains the same dominant pattern irrespective of the original pixel size of the image. In agricultural areas, typically characterized by a mosaic of cultivated fields, the wavelet transform quantified consistently a median dominant scale of 512 m in the Orthophoto, Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) and Landsat Enhanced Thematic Mapper Plus (ETM + ). The dominant scale represented the dominant field size of cultivated areas. The shape of the average wavelet energy curves was also similar among the images. In semi-natural areas the wavelet transform quantified consistently a median dominant scale of 128 m in the Orthophoto and ASTER. The median dominant scale of ETM + was slightly smaller and located at 64 m. We characterized the spatial heterogeneity of agricultural and semi-natural areas in Andalucía (Spain) using multisensor data not time coincident ranging from 1 m (Orthophoto), to 15 m (ASTER) to 28.5 m (ETM + ). The contrast in vegetation cover was measured using Normalized Difference Vegetation Index (NDVI) in ASTER and ETM + and red band in Orthophoto. We performed a multiresolution analysis using a Haar two-dimension discrete wavelet transform to quantify and compare the intensity (maximum degree of contrast in vegetation cover), the dominant scale (the scale at which the maximum intensity occurs) and the wavelet energy curve (intensity plotted as a function of the scale) of different images at intervals of power of 2 within the scale range from 2 to 4096 m.
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PLOS ONE, May 16, 2018
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PLOS Neglected Tropical Diseases, Mar 9, 2020
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International Journal of Infectious Diseases, 2019
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<p>Validation results.</p
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<p>Flowchart illustrating the 4 main steps of the wild boar (WB) density modelling approach... more <p>Flowchart illustrating the 4 main steps of the wild boar (WB) density modelling approach.</p
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<p>Suitability maps for RVF amplification (a) and spread (b) are combined to produce a synt... more <p>Suitability maps for RVF amplification (a) and spread (b) are combined to produce a synthetic suitability map for RVF occurrence in livestock with nine classes corresponding to all possible combinations of amplification suitability (low/medium/high) and spread suitability (low/medium/high) (c) and a second synthetic RVF suitability map expressed as a continuous suitability index (d).</p
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<p>Blue dots indicate the outbreak locations that were identified in the RVF at-risk areas.... more <p>Blue dots indicate the outbreak locations that were identified in the RVF at-risk areas. Yellow dots indicate outbreak locations not considered to be at-risk.</p
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<p>The cluster plot of the first and second components is shown in the inset. The symbols r... more <p>The cluster plot of the first and second components is shown in the inset. The symbols represent the administrative units grouped in the 4 clusters/regions: Asian (red), eastern (pink), western (green) and southern (blue).</p
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<p>Location of Rift Valley fever outbreaks in livestock reported in Kenya and Tanzania betw... more <p>Location of Rift Valley fever outbreaks in livestock reported in Kenya and Tanzania between 1998 and 2012.</p
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<p>Risk factor weights calculated using the analytical hierarchy process, regarding RVFV am... more <p>Risk factor weights calculated using the analytical hierarchy process, regarding RVFV amplification and spread processes.</p
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<p>Risk factors associated with the amplification and spread of Rift Valley fever in livest... more <p>Risk factors associated with the amplification and spread of Rift Valley fever in livestock populations as identified by the published literature review.</p
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<p>Contribution of the different risk factor weights to model output variance.</p
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<p>Wild boar density by administrative units (original input data) and wild boar range.</p
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Papers by claudia pittiglio