Accuracy Assessment of LiDAR-Derived Digital Elevation Models Based on Approximation Theory

Liu, Xiaohang; Hu, Hai; Peng, Hu

doi:10.3390/rs70607062

Cited by 23 publications

(15 citation statements)

References 26 publications

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“…Bhattacharyya et al, 2015; Ninfo et al, 2016). For example, high-resolution LiDAR DEM data with a spatial resolution of 1 m or less, and vertical accuracy of 0.15–0.25 m (Liu et al, 2015; Reutebuch et al, 2003), were successfully used to delineate paleochannels within the Welsh River catchment (Jones et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Tracing Holocene channels and landforms of the Nile Delta through integration of early elevation, geophysical, and sediment core data

et al. 2020

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Intensification of anthropogenic activities and related processes have altered the morphology of modern deltaic systems. As a result, mapping of geomorphic features, such as paleochannels, using recently acquired digital elevation data has become increasingly difficult. Using the Nile River and delta as a test site, we developed and applied procedures to map the distribution of paleochannels that existed throughout the Holocene. A high-resolution digital elevation model (DEM) derived from an early, detailed topographic sheet collection was used to minimize the impact of recent man-made topographic artifacts. The DEM-inferred paleochannel distribution was verified using direct and indirect subsurface data. Using our adopted methodology, we identified 76 main and subsidiary paleochannels with a total length exceeding (by >500 km) previously mapped paleochannels. The overwhelming majority (>80%) of the reported historical and archeological sites (29 sites) in the Nile Delta were found to be proximal (<2.5 km) to the identified paleochannels, an observation that is not obvious in any of the previous paleochannel delineations. These observations suggest that the delineated paleochannel distribution of the Nile Delta can be a useful guide for locating ancient cities currently obscured by man-made structures or buried under thick Holocene deposits. Moreover, it can potentially enhance our understanding of the geological and archeological history of the Nile Delta and has societal benefits as these channels could act as preferred pathways for groundwater flow. The advocated methods can be readily applied to river deltas worldwide where high-resolution elevation datasets acquired before the onset of heavy anthropogenic activities are available.

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Section: Introductionmentioning

confidence: 99%

Tracing Holocene channels and landforms of the Nile Delta through integration of early elevation, geophysical, and sediment core data

et al. 2020

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“…Finally, again using the SNHT method, the time series was homogenized, multiplying it with the ratio between the mean before and after shifting, produced by the breakpoint. [14]. The relationship of climatic variables with topographical parameters was assessed and the elevation has been found to be the most correlated factor [15].…”

Section: Methodsmentioning

confidence: 99%

Climatic Variations in Central Italy

Gentilucci¹,

Barbieri²,

Burt³

2018

Preprint

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The province of Macerata, Italy, is a topographically complex region which has been little studied in terms of its temperature and precipitation climatology. Temperature data from 81 weather stations and precipitation data from 55 rain gauges were obtained, and, following quality control procedures, were investigated on the basis of 3 standard periods: 1931-1960, 1961-1990 and 1991-2014. Spatial and temporal variations in precipitation and temperature were analysed on the basis of six topographic variable (altitude, distance from the sea, latitude, distance from the closest river, aspect, and distance from the crest line). Of these, the relationship with altitude showed the strongest correlation. Use of GIS software allowed investigation of the most accurate way to present interpolations of these data and assessment of the differences between the 3 investigated periods. The results of the analyses permit a thorough evaluation of climate change spatially over the last 60 years. Generally, the amount of precipitation is diminished while the temperature is increased across the whole study area, but with significant variations within it. Temperature increased by 2 to 3°C in the central part of the study area, while near the coast and in the mountains the change is between about 0 and 1°C,  with small decreases focused in the Appennine and foothill belt (-1 to 0°C). For precipitation, the decrease is fairly uniform across the study area (between about 0-200 mm), but with some isolated areas of strong increase (200-300 mm) and only few parts of territory in which there is an increase of 0-200 mm, mainly in the southern part of the coast, to the south-west and inland immediately behind the coast. The monthly temperature trend is characterized by a constant growth, while for precipitation there is a strong decrease in the amount measured in January, February and October (between 25 and 35 mm on average).

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“…Similarly, if the point A is higher than point B in a TIN-interpolated DEM, A is guaranteed to indeed be higher in the field. Isomorphism is important because it preserves the elevation order and sequence among terrain points (Liu et al, 2015). This is necessary for accuracy evaluation with interpolated LiDAR data.…”

Section: Accuracy Evaluationmentioning

confidence: 99%

Accuracy of Measuring the Bottom of a Pond by Airborne Lidar Bathymetry (Alb)

Wang

Kato

Abe

et al. 2020

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

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Abstract. Airborne Lidar Bathymetry (ALB) is a technology for characterizing the depths of shallow-water bodies in relatively transparent waters from an airborne platform using a scanning and pulsed light beam. A bathymetric LiDAR usually uses wo laser pulses: one is a near-infrared (NIR) laser pulse for land topography and the other is a green laser pulse for submarine topography. In recent years, ALB has become more popular in river and coastal surveying in Japan. The accuracy of ALB has been verified by comparison with the results of acoustic sounding or levelling. However, since the comparison with either acoustic sounding or levelling is limited to a partial comparison at a point or on a line such as a cross section, it is not suitable for overall verification for detailed terrain features. In addition, accuracy verification by comparison between the results of ALB's green laser scanning and those of NIR laser scanning has been performed in the past only on land, but not in water. As scattering of the green laser occurs when measuring in water, it is possible to affirm that the verification under actual operating conditions has not been sufficiently investigated. In this study, we conducted NIR laser scanning in a natural pond and an artificial pool when they had no water, and conducted green laser scanning when they were filled with water. Thus, the NIR laser scanning and the green laser scanning could be compared in terms of surface measurement for the same bottom of the water body. It was confirmed that the green laser in water has sufficient accuracy compared to the NIR laser in actual operation conditions.

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Accuracy Assessment of LiDAR-Derived Digital Elevation Models Based on Approximation Theory

Cited by 23 publications

References 26 publications

Tracing Holocene channels and landforms of the Nile Delta through integration of early elevation, geophysical, and sediment core data

Tracing Holocene channels and landforms of the Nile Delta through integration of early elevation, geophysical, and sediment core data

Climatic Variations in Central Italy

Accuracy of Measuring the Bottom of a Pond by Airborne Lidar Bathymetry (Alb)

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