Geodetic laser scanning

Carter, William E.; Shrestha, Ramesh; Slatton, K. Clint

doi:10.1063/1.2825070

Cited by 71 publications

(38 citation statements)

References 6 publications

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“…2. This shows a recent Physics Today cover graphic of a new geospatial laser mapping technology that can penetrate tree cover (Carter, Shrestha, & Slatton, 2007). The authors themselves were surprised that the resulting visual representation revealed more underlying topography by showing less information.…”

Section: Increasing Spatial Reproduction Fidelitymentioning

confidence: 99%

Naïve Realism: Folk Fallacies in the Design and Use of Visual Displays

Smallman

Cook

2010

Topics in Cognitive Science

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Often implicit in visual display design and development is a gold standard of photorealism. By approximating direct perception, photorealism appeals to users and designers by being both attractive and apparently effortless. The vexing result from numerous performance evaluations, though, is that increasing realism often impairs performance. Smallman and St. John (2005) labeled misplaced faith in realistic information display Naı¨ve Realism and theorized it resulted from a triplet of folk fallacies about perception. Here, we illustrate issues associated with the wider trend towards realism by focusing on a specific current trend for high-fidelity perspective view (3D) geospatial displays. In two experiments, we validated Naïve Realism for different terrain understanding tasks, explored whether certain individuals are particularly prone to Naïve Realism, and determined the ability of task feedback to mitigate Naïve Realism. Performance was measured for laying and judging a concealed route across realistic terrain shown in different display formats. Task feedback was either implicit, in Experiment 1, or explicit in Experiment 2. Prospective and retrospective intuitions about the best display formats for the tasks were recorded and then related to task performance and participant spatial ability. Participants generally intuited they would perform tasks better with more realism than they actually required. For example, counter to intuitions, lowering fidelity of the terrain display revealed the gross scene layout needed to lay a well-concealed route. Individuals of high spatial ability calibrated their intuitions with only implicit task feedback, whereas those of low spatial ability required salient, explicit feedback to calibrate their intuitions about display realism. Results are discussed in the wider context of applying perceptual science to display design, and combating folk fallacies.

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Section: Increasing Spatial Reproduction Fidelitymentioning

confidence: 99%

Naïve Realism: Folk Fallacies in the Design and Use of Visual Displays

Smallman

Cook

2010

Topics in Cognitive Science

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“…The Airborne Laser scanner System is an active remote sensing sensor, that coupled laser fastened on an aircraft with precise kinematic positioning provided by a differential global positioning system (DGPS) to produce accurate elevation measurements (Carter, 2007). Acquisition data from Potenza city is formulated by a "Topeye MKII" system .…”

Section: Data Collection and Processingmentioning

confidence: 99%

The Laser Scan Data as a Key Element in the Hydraulic Flood Modelling in Urban Areas

Sole

Giosa

Albano

et al. 2013

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

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ABSTRACT:This paper is intended to highlight the need to use data at high spatial resolution, such as those obtained through the use of Airborne Laser Scanning (ALS) techniques, to support hydraulic models for the assessment of flood hazards in urban territory. In fact, the significant structural features (houses, walls, roads, etc.) in the city are important in relation to both the volume of the floodplain that can be occupied by the flow and the direction that the flow takes across the floodplain. ALS data can range up to several terabytes in size and is a function of the geographic scale of the mission. Also, this data is typically irregular with uneven point density. Therefore, a quick method is described to ride out the difficulties to handle the large datasets with uneven point densities and to improve the extracting of feature information for further use in Geographic Information System (GIS) analysis. Finally, a comparison is made between the maximum inundated area obtained from ALS data and that one calculated using a traditional topographic map. The results show that the high-resolution data obtained from airborne remote sensing can increase the opportunities for representation of small-scale structural elements in complex systems using two-dimensional models of flood inundation.

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“…These show gross topography for regions situated below 2000 m a.s.l., with a vertical accuracy and of about 50 cm and a density of points of 1 m 2 (Carter et al, 2007;Schulz, 2007;SWISSTOPO, 2007). Several standard ArcGIS tools using DEMs are useful for geomorphological interpretation.…”

Section: Digital Elevation Models and Arcgis Toolsmentioning

confidence: 99%

Assessing sediment dynamics from geomorphological maps: Bruchi torrential system, Swiss Alps

Theler¹,

Reynard²,

Bardou

2008

Journal of Maps

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In alpine environments, debris flows are a dangerous geomorphic process and the main sediment transport agent in mountainous watersheds. In these areas, topographic conditions and land cover often reduce accessibility to conduct field surveys, such as geomorphological mapping. Remotely sensed data, including digital elevation models, can be used to highlight and map the main geomorphologic features, to analyse characteristics of the hydrographical network and, hence, to evidence the location and the potential volumes of sediment supply zones.

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Geodetic laser scanning

Abstract: Producing surface maps at submeter resolution, even over heavily forested terrain, GLS can reveal the fine structure of such features as faults, landslides, and drainage patterns.

Cited by 71 publications

References 6 publications

Naïve Realism: Folk Fallacies in the Design and Use of Visual Displays

Naïve Realism: Folk Fallacies in the Design and Use of Visual Displays

The Laser Scan Data as a Key Element in the Hydraulic Flood Modelling in Urban Areas

Assessing sediment dynamics from geomorphological maps: Bruchi torrential system, Swiss Alps

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