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Auteur S. Soudarissanane |
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Aeolian beach sand transport monitored by terrestrial laser scanning / Roderik Lindenbergh in Photogrammetric record, vol 26 n° 136 (December 2011 - February 2012)
[article]
Titre : Aeolian beach sand transport monitored by terrestrial laser scanning Type de document : Article/Communication Auteurs : Roderik Lindenbergh, Auteur ; S. Soudarissanane, Auteur ; S. de Vries, Auteur ; et al., Auteur Année de publication : 2011 Article en page(s) : pp 384 - 399 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] données lidar
[Termes IGN] érosion éolienne
[Termes IGN] géomorphologie
[Termes IGN] lasergrammétrie
[Termes IGN] littoral
[Termes IGN] Pays-Bas
[Termes IGN] sable
[Termes IGN] surveillance géologique
[Termes IGN] transport éolienRésumé : (Auteur) Morphodynamic changes at sandy coasts, as are dominant in the Netherlands, are typically monitored at yearly intervals by means of airborne laser scanning. Meanwhile it is recognised that beach morphodynamics is not a regular process and is strongly correlated to meteorological conditions. A series of 25 terrestrial laser scans of a beach experiment is analysed, obtained during a time period of 88 hours, characterised by changing weather conditions including strong wind and rain. It is shown that after a conversion to a cylindrical grid, different deformation regimes can be identified and rates of elevation changes below 1 mm per hour can be detected. Simultaneously, an analysis of distances between targets through time demonstrates the sensitivity of the used measurement set-up to the harsh weather conditions. Numéro de notice : A2011-493 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2011.00659.x En ligne : http://dx.doi.org/10.1111/j.1477-9730.2011.00659.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31387
in Photogrammetric record > vol 26 n° 136 (December 2011 - February 2012) . - pp 384 - 399[article]Scanning geometry: Influencing factor on the quality of terrestrial laser scanning points / S. Soudarissanane in ISPRS Journal of photogrammetry and remote sensing, vol 66 n° 4 (July - August 2011)
[article]
Titre : Scanning geometry: Influencing factor on the quality of terrestrial laser scanning points Type de document : Article/Communication Auteurs : S. Soudarissanane, Auteur ; Roderik Lindenbergh, Auteur ; Massimo Menenti, Auteur ; Peter J.G. Teunissen, Auteur Année de publication : 2011 Article en page(s) : pp 389 - 399 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] angle de visée
[Termes IGN] balayage laser
[Termes IGN] bruit atmosphérique
[Termes IGN] mesurage électronique de distances
[Termes IGN] réflectance de surface
[Termes IGN] semis de points
[Termes IGN] télémétrie laser terrestreRésumé : (Auteur) A terrestrial laser scanner measures the distance to an object surface with a precision in the order of millimeters. The quality of the individual points in a point cloud, although directly affecting standard processing steps like point cloud registration and segmentation, is still not well understood. The quality of a scan point is influenced by four major factors: instrument mechanism, atmospheric conditions, object surface properties and scan geometry. In this paper, the influence of the scan geometry on the individual point precision or local measurement noise is considered. The local scan geometry depends on the distance and the orientation of the scanned surface, relative to the position of the scanner. The local scan geometry is parameterized by two main parameters, the range, i.e. the distance from the object to the scanner and the incidence angle, i.e. the angle between incoming laser beam and the local surface normal. In this paper, it is shown that by studying the influence of the local scan geometry on the signal to noise ratio, the dependence of the measurement noise on range and incidence angle can be successfully modeled if planar surfaces are observed. The implications of this model is demonstrated further by comparing two point clouds of a small room, obtained from two different scanner positions: a center position and a corner position. The influence of incidence angle on the noise level is quantified on scans of this room, and by moving the scanner by 2 m, it is reduced by 20%. The improvement of the standard deviation is significant, going from 3.23 to 2.55 mm. It is possible to optimize measurement setups in such a way that the measurement noise due to bad scanning geometry is minimized and therefore contribute to a more efficient acquisition of point clouds of better quality. Numéro de notice : A2011-296 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2011.01.005 En ligne : https://doi.org/10.1016/j.isprsjprs.2011.01.005 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31075
in ISPRS Journal of photogrammetry and remote sensing > vol 66 n° 4 (July - August 2011) . - pp 389 - 399[article]Réservation
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