The Experts below are selected from a list of 57 Experts worldwide ranked by ideXlab platform

Rupert Till - One of the best experts on this subject based on the ideXlab platform.

  • The frequency spectrum and geometry of the Ħal Saflieni Hypogeum appear tuned
    Journal of Archaeological Science: Reports, 2020
    Co-Authors: Kristina Wolfe, Douglas Swanson, Rupert Till
    Abstract:

    Abstract The Ħal Saflieni Hypogeum is a unique subterranean Maltese Neolithic sanctuary with a well-documented history of interest in its acoustics (Till, 2017; Debertolis et al., 2015; Reznikoff, 2014; Devereux, 2009; Skeates, 2008; Mifsud and Mifsud 1999; Devereux, 1996; Evans, 1971; Zammit, 1910; Griffiths, 1920). Previous studies have noted its unusual strongly-defined frequency spectrum (Debertolis et al., 2015), but it is unknown if this was coincidental. In this paper, we present evidence that the Hypogeum’s creators shaped the site’s geometry to create or amplify its frequency spectrum, or another property closely correlated with the spectrum. Specifically, we show that the observed spectrum required jointly fine-tuning the dimensions of multiple non-contiguous cave walls across multiple independent chambers, to a degree that seems unlikely to be coincidental. We also note that the peak frequencies are evenly spaced and resemble a whole-tone scale in music, which is also unlikely to be coincidental and suggests the spectrum itself might have held some cultural significance. Taken together, it suggests acoustic or spectral properties may have played a motivational or cultural role for the site's Neolithic creators. This work identifies one of the earliest known examples of a Manmade Structure with a significant musical element to its interior architecture.

Wolfgang-martin Boerner - One of the best experts on this subject based on the ideXlab platform.

  • polarimetric analysis of radar signature of a Manmade Structure
    IEEE Geoscience and Remote Sensing Letters, 2006
    Co-Authors: Jong-sen Lee, Ernst Krogager, Thomas L. Ainsworth, Wolfgang-martin Boerner
    Abstract:

    Identification of Manmade Structures from radar images has always been a difficult task, especially for single-polarization radar. Fully polarimetric radar, however, can provide detailed information on scattering mechanisms that could enable the target or the Structure to be identified. Complexity remains stemming from overlaps of single-bounce scattering, double-bounce scattering, and triple- and higher order bounce scattering from various components of a Manmade Structure, which makes physical interpretation a challenge. In this letter, an interesting example using polarimetric synthetic aperture radar (PolSAR) data of the Great Belt Bridge, Denmark, was presented to illustrate the capability of PolSAR in analyzing radar signatures. Polarimetric target decomposition is used to differentiate the multiple-bounce scatterings contained in the PolSAR images. Two C-band Danish EMISAR data takes, with the first obtained during the bridge's construction and the second after its completion, are used to extract the scattering characteristics of the bridge deck, bridge cables, and supporting Structures

  • Polarimetric Analysis of Radar Signature of a Manmade Structure
    2006 International Radar Symposium, 2006
    Co-Authors: Ernst Krogager, Jong-sen Lee, Wolfgang-martin Boerner, Thomas L. Ainsworth
    Abstract:

    Identification of Manmade Structures from radar images has always been a difficult task, especially for single-polarization radar. Fully polarimetric radar, however, can provide detailed information on scattering mechanisms that could enable the target or the Structure to be identified. Complexity remains stemming from overlaps of single bounce scattering, double bounce scattering and triple and higher order bounce scattering from various components of Manmade Structure that makes physical interpretation a challenge. In this paper, we will present an interesting example using polarimetric SAR data of the Great Belt Bridge, Denmark, to illustrate the capability of polarimetric SAR in analyzing radar signatures. Polarimetric target decomposition is used to differentiate the multiple bounce scattering contributions contained in the polarimetric SAR images. Two C-band Danish EMISAR data takes, the first obtained during the bridge's construction and the second after its completion, are used to extract the scattering characteristics of the bridge deck, bridge cables and supporting Structures.

Kristina Wolfe - One of the best experts on this subject based on the ideXlab platform.

  • The frequency spectrum and geometry of the Ħal Saflieni Hypogeum appear tuned
    Journal of Archaeological Science: Reports, 2020
    Co-Authors: Kristina Wolfe, Douglas Swanson, Rupert Till
    Abstract:

    Abstract The Ħal Saflieni Hypogeum is a unique subterranean Maltese Neolithic sanctuary with a well-documented history of interest in its acoustics (Till, 2017; Debertolis et al., 2015; Reznikoff, 2014; Devereux, 2009; Skeates, 2008; Mifsud and Mifsud 1999; Devereux, 1996; Evans, 1971; Zammit, 1910; Griffiths, 1920). Previous studies have noted its unusual strongly-defined frequency spectrum (Debertolis et al., 2015), but it is unknown if this was coincidental. In this paper, we present evidence that the Hypogeum’s creators shaped the site’s geometry to create or amplify its frequency spectrum, or another property closely correlated with the spectrum. Specifically, we show that the observed spectrum required jointly fine-tuning the dimensions of multiple non-contiguous cave walls across multiple independent chambers, to a degree that seems unlikely to be coincidental. We also note that the peak frequencies are evenly spaced and resemble a whole-tone scale in music, which is also unlikely to be coincidental and suggests the spectrum itself might have held some cultural significance. Taken together, it suggests acoustic or spectral properties may have played a motivational or cultural role for the site's Neolithic creators. This work identifies one of the earliest known examples of a Manmade Structure with a significant musical element to its interior architecture.

Jong-sen Lee - One of the best experts on this subject based on the ideXlab platform.

  • polarimetric analysis of radar signature of a Manmade Structure
    IEEE Geoscience and Remote Sensing Letters, 2006
    Co-Authors: Jong-sen Lee, Ernst Krogager, Thomas L. Ainsworth, Wolfgang-martin Boerner
    Abstract:

    Identification of Manmade Structures from radar images has always been a difficult task, especially for single-polarization radar. Fully polarimetric radar, however, can provide detailed information on scattering mechanisms that could enable the target or the Structure to be identified. Complexity remains stemming from overlaps of single-bounce scattering, double-bounce scattering, and triple- and higher order bounce scattering from various components of a Manmade Structure, which makes physical interpretation a challenge. In this letter, an interesting example using polarimetric synthetic aperture radar (PolSAR) data of the Great Belt Bridge, Denmark, was presented to illustrate the capability of PolSAR in analyzing radar signatures. Polarimetric target decomposition is used to differentiate the multiple-bounce scatterings contained in the PolSAR images. Two C-band Danish EMISAR data takes, with the first obtained during the bridge's construction and the second after its completion, are used to extract the scattering characteristics of the bridge deck, bridge cables, and supporting Structures

  • Polarimetric Analysis of Radar Signature of a Manmade Structure
    2006 International Radar Symposium, 2006
    Co-Authors: Ernst Krogager, Jong-sen Lee, Wolfgang-martin Boerner, Thomas L. Ainsworth
    Abstract:

    Identification of Manmade Structures from radar images has always been a difficult task, especially for single-polarization radar. Fully polarimetric radar, however, can provide detailed information on scattering mechanisms that could enable the target or the Structure to be identified. Complexity remains stemming from overlaps of single bounce scattering, double bounce scattering and triple and higher order bounce scattering from various components of Manmade Structure that makes physical interpretation a challenge. In this paper, we will present an interesting example using polarimetric SAR data of the Great Belt Bridge, Denmark, to illustrate the capability of polarimetric SAR in analyzing radar signatures. Polarimetric target decomposition is used to differentiate the multiple bounce scattering contributions contained in the polarimetric SAR images. Two C-band Danish EMISAR data takes, the first obtained during the bridge's construction and the second after its completion, are used to extract the scattering characteristics of the bridge deck, bridge cables and supporting Structures.

Douglas Swanson - One of the best experts on this subject based on the ideXlab platform.

  • The frequency spectrum and geometry of the Ħal Saflieni Hypogeum appear tuned
    Journal of Archaeological Science: Reports, 2020
    Co-Authors: Kristina Wolfe, Douglas Swanson, Rupert Till
    Abstract:

    Abstract The Ħal Saflieni Hypogeum is a unique subterranean Maltese Neolithic sanctuary with a well-documented history of interest in its acoustics (Till, 2017; Debertolis et al., 2015; Reznikoff, 2014; Devereux, 2009; Skeates, 2008; Mifsud and Mifsud 1999; Devereux, 1996; Evans, 1971; Zammit, 1910; Griffiths, 1920). Previous studies have noted its unusual strongly-defined frequency spectrum (Debertolis et al., 2015), but it is unknown if this was coincidental. In this paper, we present evidence that the Hypogeum’s creators shaped the site’s geometry to create or amplify its frequency spectrum, or another property closely correlated with the spectrum. Specifically, we show that the observed spectrum required jointly fine-tuning the dimensions of multiple non-contiguous cave walls across multiple independent chambers, to a degree that seems unlikely to be coincidental. We also note that the peak frequencies are evenly spaced and resemble a whole-tone scale in music, which is also unlikely to be coincidental and suggests the spectrum itself might have held some cultural significance. Taken together, it suggests acoustic or spectral properties may have played a motivational or cultural role for the site's Neolithic creators. This work identifies one of the earliest known examples of a Manmade Structure with a significant musical element to its interior architecture.