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Characterizing errors in airborne Laser altimetry data to extract soil roughness / Ian J. Davenport in IEEE Transactions on geoscience and remote sensing, vol 42 n° 10 (October 2004)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 42 n° 10 (October 2004) . - pp 2130 - 2141 Titre : Characterizing errors in airborne Laser altimetry data to extract soil roughness Type de document : Article/Communication Auteurs : Ian J. Davenport, Auteur ; N. Holden, Auteur ; R.J. Gurney, Auteur Année de publication : 2004 Conférence : IGARSS 2003, International Geoscience And Remote Sensing Symposium 21/07/2003 25/07/2003 Toulouse France Proceedings IEEE Article en page(s) : pp 2130 - 2141 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] altitude [Termes IGN] cohérence des données [Termes IGN] erreur aléatoire [Termes IGN] erreur de mesure [Termes IGN] erreur moyenne quadratique altimétrique [Termes IGN] rugosité du sol [Termes IGN] surface du sol [Termes IGN] système de positionnement par satellites [Termes IGN] télémétrie laser aéroporté Résumé : (Auteur) Airborne laser altimetry has the potential to make frequent detailed observations that are important for many aspects of studying land surface processes. However, the uncertainties inherent in airborne laser altimetry data have rarely been well measured. Uncertainty is often specified as generally as 20 cm in elevation and 40 cm planimetric. To better constrain these uncertainties, we present an analysis of several datasets acquired specifically to study the temporal consistency of laser altimetry data and, thus, assess its operational value. The error budget has three main components, each with a time regime. For measurements acquired less than 50 ms apart, elevations have a local standard deviation in height of 3.5 cm, enabling the local measurement of surface roughness of the order of 5 cm. Points acquired seconds apart acquire an additional random error due to differential geographic positioning system fluctuation. Measurements made up to an hour apart show an elevation drift of 7 cm over a half hour. Over months, this drift gives rise to a random elevation offset between swathes, with an average of 6.4 cm. The root mean square planimetric error in point location was derived as 37.4 cm. We conclude by considering the consequences of these uncertainties on the principle application of laser altimetry in the U.K. intertidal zone monitoring. Numéro de notice : A2004-455 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2004.834648 En ligne : https://doi.org/10.1109/TGRS.2004.834648 Format de la ressource électronique : URl article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26975 [article]

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