b5219540-0170-4caf-8a0f-69c1cc6a0e7c eng Bourgine, Bernard Bureau de Recherches Géologiques et Minières (BRGM) b.bourgine@brgm.fr CEBA géoportail Institut de recherche pour le développement (IRD) ceba.geoportail@ird.fr 2017-05-04T15:02:42 ISO 19115:2003/19139 1.0 CSG67 / UTM zone 22N (EPSG:2971) EPSG 7.9 Aerial laser scanning (LIDAR) survey over French Guiana conducted by French Geological Survey (BRGM) in 1996. 1996-01-01 CEBA_ALS_BRGM_xxXXXX1996 The airborne data comprises laser elevation data acquired during an airborne geophysical survey over French Guiana in 1996. The study area, located along the coast in the south of Cayenne in French Guiana, measures 45 km x 55 km. The area is characterized by virgin forest and savannah. Most of the area is flat or slightly undulating, with elevation ranging from 0 to about 400 m above sea level. (e.g. Kaw mountain). SOCIÉTÉ ALTOA Bourgine, Bernard Bureau de Recherches Géologiques et Minières (BRGM) b.bourgine@brgm.fr Elevation GEMET - INSPIRE themes, version 1.0 INSPIRE themes 2008-06-01 geonetwork.thesaurus.external.theme.inspire-theme Americas South America France French Guiana Geounits 2016-01-01 geonetwork.thesaurus.external.place.regions laser remote sensing vegetation cover GEMET - Concepts, version 2.4 2010-01-13 geonetwork.thesaurus.external.theme.gemet local coverage labex CEBA aerial laser scanning (ALS) Cayenne Please get in touch with a point of contact. Unknown 0.35 eng elevation -51.83333 -52.5 4.33333 5 1996-01-01 1996-12-31 Bibliography : Bourgine B., Baghdadi N., Hosford S., and Daniels P., 2004. Generation of a ground-level DEM in a dense equatorial forest zone by merging airborne laser data and a top-of-canopy DEM. Canadian Journal of Remote Sensing, vol. 30, no. 6, pp. 913-926 unknown 1 http://www.researchgate.net/publication/236882502_Generation_of_a_ground-level_DEM_in_a_dense_equatorial_forest_zone_by_merging_airborne_laser_data_and_a_top-of-canopy_DEM/file/e0b49519e0e04cb0bd.pdf WWW:LINK-1.0-http--related Bourgine B., Baghdadi N., Hosford S., and Daniels P., 2004. Generation of a ground-level DEM in a dense equatorial forest zone by merging airborne laser data and a top-of-canopy DEM. Canadian Journal of Remote Sensing, vol. 30, no. 6, pp. 913-926 Flight lines were oriented N30° with a 500-m spacing, complemented by transverse flight lines oriented N120° with a 5-km spacing. Laser sampling density was approximately 7 m along flight lines (sampling frequency = 10 Hz). Laser wavelength is 905 nm and footprint size is 35 cm. The laser measurements are therefore considered as point data. The available laser data correspond to the first pulse returned, i.e. the first obstacle encountered. As these laser data were acquired for the purpose of checking the quality of the geophysical survey, particularly the flight ground clearance, a low sampling frequency was chosen and only the first pulse considered. The quality of the airborne data was assessed by examining the errors at flight-line intersections (lines N030° and N120°). Assuming that the errors related to linear interpolation carried out in the vicinity of flight-line intersections are insignificant for flat terrain (elevation <10 m), then elevation accuracy for the filtered data is estimated at around +-2 m.