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Overview of Applications of Hyperspectral Satellites in Earth Observations
Published in Shen-En Qian, Hyperspectral Satellites and System Design, 2020
The CFB Wainwright trial was to demonstrate the portability of the trafficability model to different soil and vegetation ecosystems. The above ground trafficability was determined by a semi-arid prairie landscape with well-defined dry and wet seasons. The vegetation was composed of grassland with areas of deciduous trees (aspen, balsam poplar, and willow) and the topography was gentle. The hyperspectral vegetation products of land cover classes and LAI were used. Figure 3.28 shows the optimal route planning between point A and point B for a Wolf vehicle (an armored personnel carrier) and a LAV vehicle (an eight-wheeled amphibious armored reconnaissance vehicle) constrained by wet areas and vegetation. Figure 3.28a is RGB color-composite image of hyperspectral imagery acquired with an AISA sensor, while Figure 3.28b, c represents wet season and dry season conditions. Figure 3.28d presents the wet season situation and the requirement to move along tree lines as closely as possible (Ardouin et al. 2012).
Topography and Bathymetry
Published in Jochen Aberle, Colin D. Rennie, David M. Admiraal, Marian Muste, Experimental Hydraulics: Methods, Instrumentation, Data Processing and Management, 2017
Jochen Aberle, Colin D. Rennie, David M. Admiraal, Marian Muste
More recently, this restriction has been relaxed through the development of mobile deployment and data acquisition strategies. At their simplest, this can involve deploying the sensor head on a stable, mobile platform to facilitate rapid movements between survey stations. Scans are then obtained in “stop-and-go” mode, while the scanner is held stationary and then moved rapidly between scans. This approach was employed by Williams et al. (2011, 2014) to enable a high density topographic survey of the braided gravel-bedded Rees River in New Zealand. In their experimental setup, a high speed phase-based Leica 6200 scanner was mounted on a ruggedized, amphibious, all-terrain ARGO vehicle, which also incorporated GPS positioning, a panoramic camera and continuous AC power and data storage. The short-range scanner used provided very high frequency scans (less than 3 minutes for a full dome scan), but only over ranges of 40–60 m. Coverage of a 2.5 x 0.7 km reach involved over 300 individual scans, that were co-registered and georeferenced using a mobile network of GNSS-located targets, requiring between 3–5 days of field sampling per survey. Using this approach they were able to acquire a detailed time-series of surveys with typical vertical errors of 0.03 m that captured the evolution of this large braided river through a consecutive set of competent flood events (Figure 4.2.5).
Metallic Armour Materials and Structures
Published in Paul J. Hazell, Armour, 2023
The use of aluminium in domestic applications has increased dramatically since 1960 with the transport sector being the largest user. It was around the 1950s and 1960s that aluminium alloys were being used in the design of AFVs including the British combat vehicle reconnaissance (CVR) family of vehicles and the M113 APC. With the M113, the US Army wanted a lightly armoured, air-transportable, air-droppable amphibious vehicle. Aluminium-based armour seemed an appropriate route to take given the relatively low density of aluminium and the discovery that, ballistically, certain wrought alloys performed quite well.
Drag reduction design and research of high-speed amphibious vehicle’s deformable track wheels
Published in Ships and Offshore Structures, 2023
Bolong Liu, Xiaojun Xu, Dibo Pan, Yikun Feng, Shengyang Lu
Amphibious vehicles are designed to pass through the river, sea, and coastal areas. In recent years, amphibious vehicles have been widely used in military and civilian fields (Nakisa et al. 2017). In underdeveloped and post-disaster areas, amphibious vehicles can quickly cross water barriers and carry out transport and rescue missions. On offshore, amphibious vehicles can easily transport people and materials between water and land, effectively saving transition time. The high manoeuverability and carrying capacity of the amphibious vehicle also provide effective support for offshore patrols. The high-speed amphibious vehicle (HSAV) is a kind of light multi-function unmanned vehicle with high mobility on the water. It can carry different loads when passing and working in complex waters (Pan et al. 2021).