Early Results of Simultaneous Terrain and Shallow Water Bathymetry Mapping Using a Single-Wavelength Airborne LiDAR Sensor

Fernández-Diaz, Juan Carlos; Glennie, C. L.; Carter, William E.; Shrestha, Ramesh; Sartori, Michael; Singhania, Abhinav; Legleiter, Carl J.; Overstreet, B. T.

doi:10.1109/jstars.2013.2265255

Cited by 59 publications

(53 citation statements)

References 29 publications

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“…These "raw" point clouds are then processed using various algorithms [2] that may consider both the distribution and intensity of the returns, in order to classify the returns as most likely being from vegetation, human engineered structures, or the 'bare earth.' Or, when the ALS utilizes a laser with a wavelength that penetrates water, points may also be classified as most likely being from the surface, within, or the bottom of water bodies, including streams, lakes and near shore coastal waters [3].…”

Section: Introductionmentioning

confidence: 99%

Now You See It… Now You Don’t: Understanding Airborne Mapping LiDAR Collection and Data Product Generation for Archaeological Research in Mesoamerica

et al. 2014

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Abstract:In this paper we provide a description of airborne mapping LiDAR, also known as airborne laser scanning (ALS), technology and its workflow from mission planning to final data product generation, with a specific emphasis on archaeological research. ALS observations are highly customizable, and can be tailored to meet specific research needs. Thus it is important for an archaeologist to fully understand the options available during planning, collection and data product generation before commissioning an ALS survey, to ensure the intended research questions can be answered with the resultant data products. Also this knowledge is of great use for the researcher trying to understand the quality and limitations of existing datasets collected for other purposes. Throughout the paper we use examples from archeological ALS projects to illustrate the key concepts of importance for the archaeology researcher.

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Section: Introductionmentioning

confidence: 99%

Now You See It… Now You Don’t: Understanding Airborne Mapping LiDAR Collection and Data Product Generation for Archaeological Research in Mesoamerica

et al. 2014

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“…This criteria was meant to improve upon the capabilities obtained with the single-wavelength Aquarius lidar bathymetric sensor described in [16]. The Titan bathymetric channel is designed based on a performance specification of 1.5/Kd considering a flying height of 400 m above water and a benthic reflectivity of 20%.…”

Section: Bathymetric Capabilitiesmentioning

confidence: 99%

Capability Assessment and Performance Metrics for the Titan Multispectral Mapping Lidar

et al. 2016

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Abstract:In this paper we present a description of a new multispectral airborne mapping light detection and ranging (lidar) along with performance results obtained from two years of data collection and test campaigns. The Titan multiwave lidar is manufactured by Teledyne Optech Inc. (Toronto, ON, Canada) and emits laser pulses in the 1550, 1064 and 532 nm wavelengths simultaneously through a single oscillating mirror scanner at pulse repetition frequencies (PRF) that range from 50 to 300 kHz per wavelength (max combined PRF of 900 kHz). The Titan system can perform simultaneous mapping in terrestrial and very shallow water environments and its multispectral capability enables new applications, such as the production of false color active imagery derived from the lidar return intensities and the automated classification of target and land covers. Field tests and mapping projects performed over the past two years demonstrate capabilities to classify five land covers in urban environments with an accuracy of 90%, map bathymetry under more than 15 m of water, and map thick vegetation canopies at sub-meter vertical resolutions. In addition to its multispectral and performance characteristics, the Titan system is designed with several redundancies and diversity schemes that have proven to be beneficial for both operations and the improvement of data quality.

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“…Whereas coastal mapping is the main application of ALB, state-of-the art sensors also enable surveying of smaller inland water bodies and especially clear gravel-bed rivers (Hilldale and Raff, 2008;Kinzel et al, 2013;Fernandez et al, 2014;Mandlburger et al, 2015a). This was mainly made possible by two facts: (i) the increased measurement rate lead to a much higher sampling density (dozens of points per m 2 ), and (ii) by narrowing the beam divergence the laser footprint diameter on the surface was brought down from 2-5 m to approximately 0.5 m for a standard flying height of 500-600 m above ground/water level (Fernandez et al, 2014;Doneus et al, 2015). With those mission parameters capturing of small to medium rivers (width: 5-25 m, depth: 0-4 m) became feasible.…”

Section: Introductionmentioning

confidence: 99%

“…However, the planar mapping resolution of ALB is limited by the size of the laser footprint which, in turn, is constrained by eye safety considerations (Guenther et al, 2000;Fernandez et al, 2014;Doneus et al, 2015). Precise capturing of blocks or boulders with a diameter of less than 50 cm is therefore impossible with typical ALB setups.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a Novel Uav-Borne Topo-Bathymetric Laser Profiler

Mandlburger¹,

Pfennigbauer²,

Wieser³

et al. 2016

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:We present a novel topo-bathymetric laser profiler. The sensor system (RIEGL BathyCopter) comprises a laser range finder, an Inertial Measurement Unit (IMU), a Global Navigation Satellite System (GNSS) receiver, a control unit, and digital cameras mounted on an octocopter UAV (RiCOPTER). The range finder operates on the time-of-flight measurement principle and utilizes very short laser pulses (<1 ns) in the green domain of the spectrum (λ=532 nm) for measuring distances to both the water surface and the river bottom. For assessing the precision and accuracy of the system an experiment was carried out in October 2015 at a pre-alpine river (Pielach in Lower Austria). A 200 m longitudinal section and 12 river cross sections were measured with the BathyCopter sensor system at a flight altitude of 15-20 m above ground level and a measurement rate of 4 kHz. The 3D laser profiler points were compared with independent, quasi-simultaneous data acquisitions using (i) the RIEGL VUX1-UAV lightweight topographic laser scanning system (bare earth, water surface) and (ii) terrestrial survey (river bed). Over bare earth the laser profiler heights have a std. dev. of 3 cm, the water surface height appears to be underestimated by 5 cm, and river bottom heights differ from the reference measurements by 10 cm with a std. dev. of 13 cm. When restricting the comparison to laser profiler bottom points and reference measurements with a lateral offset below 1 m, the values improve to 4 cm bias with a std. dev. of 6 cm. We report additionally on challenges in comparing UAV-borne to terrestrial profiles. Based on the accuracy and the small footprint (3.5 cm at the water surface) we concluded that the acquired 3D points can potentially serve as input data (river bed geometry, grain roughness) and validation data (water surface, water depth) for hydrodynamic-numerical models.

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Early Results of Simultaneous Terrain and Shallow Water Bathymetry Mapping Using a Single-Wavelength Airborne LiDAR Sensor

Cited by 59 publications

References 29 publications

Now You See It… Now You Don’t: Understanding Airborne Mapping LiDAR Collection and Data Product Generation for Archaeological Research in Mesoamerica

Now You See It… Now You Don’t: Understanding Airborne Mapping LiDAR Collection and Data Product Generation for Archaeological Research in Mesoamerica

Capability Assessment and Performance Metrics for the Titan Multispectral Mapping Lidar

Evaluation of a Novel Uav-Borne Topo-Bathymetric Laser Profiler

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