Adequacy of pseudo-direct georeferencing of terrestrial laser scanning data for coastal landscape surveying against indirect georeferencing
|Author(s)||Jaud Marion1, Letortu Pauline2, Augereau Emmanuel1, Le Dantec Nicolas1, 3, Beauverger Mickael1, Cuq Veronique2, Prunier Christophe1, Le Bivic Rejanne1, Delacourt Christophe1|
|Affiliation(s)||1 : Univ Bretagne Occidentale, IUEM, UMR 6538, Lab Domaines Ocean, Technopole Brest Iroise,Rue Dumont Durville, F-29280 Plouzane, France.
2 : Univ Bretagne Occidentale, IUEM, UMR 6554, LETG Brest Geomer, Technopole Brest Iroise, Plouzane, France.
3 : DTecEMF, CEREMA Ctr Etudes & Expertise Risques Environm Mo, Plouzane, France.
|Source||European Journal Of Remote Sensing (Taylor & Francis Ltd), 2017 , Vol. 50 , N. 1 , P. 155-165|
|WOS© Times Cited||10|
|Keyword(s)||Terrestrial laser scanning, coastal monitoring, direct georeferencing, indirect georeferencing, multi-temporal surveys, geomorphological evolution|
The georeferencing process is crucial to the accuracy of terrestrial laser scanner (TLS) data, in particular in the context of diachronic studies relying on multi-temporal surveys. The use of Ground Control Points in the georeferencing process can however be complex when confronted with the practical constraints of coastal surveying. A simple and quick alternative method called "pseudo-direct georeferencing" is proposed in the present paper. This method involves internal inclinometers to measure roll and pitch angles and a centimetric GPS to measure the position of the TLS center and the position of one backsight target. When assessing the transformational uncertainty by using a set of independent ground validation points for both classical indirect and proposed pseudo-direct methods, we respectively obtain root mean square errors of 4.4 cm for the indirect method and 3.8 cm for the pseudo-direct method.