Results 211 to 220 of about 52,927 (253)

Airborne lidar measurements for Cryosat validation

IEEE International Geoscience and Remote Sensing Symposium, 2003
Airborne laser measurements provide a detailed capability to measure the geometry of an ice surface with an accuracy of 5-25 cm over a large range of spatial scales (1 m to 100's of km), either as along-track profiles or scanning lidar swath mapping transects, thus providing a useful calibration and validation tool for Cryosat measurements.
René Forsberg, Kristian Keller, S. M. Jacobsen   +2 more
openaire   +1 more source

Robust watermarking of airborne LiDAR data

Multimedia Tools and Applications, 2018
This paper presents a novel robust approach developed specially for watermarking airborne LiDAR data, which consist of a large cloud of geo-referenced points and has some unique characteristics. The approach consists of the following steps: (1) Defining the marker circular areas, in which the watermark bit will be embedded; (2) Dividing the marker ...
Bogdan Lipus, Borut Zalik
openaire   +1 more source

Airborne Lidar Measurements of Aerosols

Optical Remote Sensing of the Atmosphere, 1993
Aerosols are now recognized as having a significant impact on global climate. Aerosols affect climate directly via scattering and absorption, and indirectly through their effect on cloud properties, generally acting in a manner that counteracts the warming induced by greenhouse gases such as CO2[Charlson et al., 1992; Fouquart and Isaka, 1992; Penner ...
William B. Grant, Edward V. Browell, Bruce E. Anderson, Syed Ismail   +3 more
openaire   +1 more source

DFVLR airborne lidar system

Conference on Laser and Electrooptical Systems, 1976
The DFVLR-Lidar-System VI is made for airborne use to measure aerosol mass concentration over greater areas than it is possible from ground stations. It consists of a Nd-glass laser as a transmitter and a parabolic mirror as a receiver. Technical data are given in Table I.
C. Werner, W. Michl
openaire   +1 more source

Airborne cw Doppler Lidar - ADOLAR

Coherent Laser Radar, 1995
For the airborne measurement of the wind field, knowledge of the exact velocity and orientation of the plane is mandatory. Any small deviation in these parameter will cause an error in the estimation of the wind field. The conical scanning airborne cw CO2 Doppler lidar ADOLAR has been designed to gain experience concerning the correction of the ...
openaire   +2 more sources

Airborne Lidar Measurements Of Aerosols

SPIE Proceedings, 1988
The airborne lidar system of the Aerosol Research Branch, NASA Langley Research Center, has been used since 1978 to study the behavior of the stratospheric aerosol on a global scale. The system, in its current configuration, can operate at a wavelength of either 0.6943 pm (ruby laser) or 0.530 μm (frequency doubled Nd:YAG laser).
M P. McCormick, G S. Kent
openaire   +1 more source

Airborne Doppler lidar wind measurements

Conference Digest. 2000 Conference on Lasers and Electro-Optics Europe (Cat. No.00TH8505), 2000
Summary form only given. Study of the atmospheric wind field is fundamental for the understanding and prediction of the weather development. To overcome the spatial limitations of ground based observations, airborne measurements are recognised as excellent tools to study atmospheric processes.
openaire   +2 more sources

LiDAR-guided analysis of airborne hyperspectral data

2009 First Workshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing, 2009
This paper describes a new framework to the collection and fusion of multisensor airborne LiDAR and hyperspectral data. We describe a data fusion philosophy that provides a spatially precise positioning of hyperspectral data based on discrete first and last return LiDAR data.
K. Olaf Niemann, Gordon Frazer, Rafael Loos, Fabio Visintini   +3 more
openaire   +1 more source

Effects of ocean waves on airborne lidar imaging

Applied Optics, 1996
The effects of ocean waves on lidar imaging of submerged objects are investigated. Two significant consequences of wave focusing or defocusing are quantified: (a) intensification of near-surface backscatter in which the mean return is increased relative to that for a flat interface, and (b) spatial-temporal modulations of the backscattered return.
J W, McLean, J D, Freeman
openaire   +2 more sources

Geometry based airborne LIDAR data compression

2013 IEEE International Conference on Multimedia and Expo (ICME), 2013
Airborne LIDAR data often consumes hundreds of gigabytes. Existing LIDAR data compression schemes can compress the file to 5%-23% of the original size. Even after compression, the compressed data size is still in the order of gigabyte, which makes it impractical for many applications. This paper proposes a novel geometry based compression scheme.
Xiaoling Li, Wenjun Zeng 0001, Ye Duan
openaire   +1 more source