Google Earth's derived digital elevation model: A comparative assessment with Aster and SRTM data

Rusli, Noradila; Majid, Mohammad Rafee; Din, Ami Hassan Md

doi:10.1088/1755-1315/18/1/012065

Cited by 35 publications

(17 citation statements)

References 3 publications

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“…Google Earth uses SPOT or products from DigitalGlobe (e.g., IKONOS or Quickbird) that have a spatial resolution close to that of aerial photographs (Schmid et al 2014). The application geo-rectifies the imagery onto a Digital Terrain Model with an accuracy of up to ±90 m (Rusli, Majid, and Din 2014). Only snow-free and cloud-free imagery was used in the survey, and identification was supplemented with field validation where access permitted.…”

Section: Rock Glacier Classificationmentioning

confidence: 99%

An inventory of rock glaciers in the central British Columbia Coast Mountains, Canada, from high resolution Google Earth imagery

Charbonneau

Smith

2018

Arctic, Antarctic, and Alpine Research

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Little is known about the presence, distribution, age, or activity of rock glaciers in the British Columbia Coast Mountains of western Canada. Reflecting debris accumulation and mass wasting under a periglacial climate, these rock glaciers describe a geomorphic response to permafrost regimes that may or may not presently exist. An inventory of rock glacier landforms in the eastern front ranges of the Coast Mountains, using high-resolution Google Earth imagery, documented 165 rock glaciers between lat. 50°10ʹ and 52°08ʹ N. The majority of these rock glaciers occur at sites positioned between 1,900 and 2,300 m above sea level, where rain shadow effects and continental air masses result in persistent dry, cold conditions. Morphology and field observation suggest that these features contain intact ice. The rock glaciers occupy predominately northwestto northeast-facing slopes, with talus-derived rock glaciers largely restricted to north-facing slopes. Glacier-derived features outnumber talus-derived features by a ratio of 5:1. Several of the inventoried rock glaciers were located up valley from presumed Younger Dryas terminal moraines, indicating that they formed after 9390 BP. Dendrogeomorphological investigations at one rock glacier record contemporary activity that resulted in 1.3 cm/yr of frontal advance since AD 1674. This inventory is the first to document the presence of rock glaciers in the Coast Mountains and supports preliminary understandings of permafrost distribution in the southwestern Canadian Cordillera.

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Section: Rock Glacier Classificationmentioning

confidence: 99%

An inventory of rock glaciers in the central British Columbia Coast Mountains, Canada, from high resolution Google Earth imagery

Charbonneau

Smith

2018

Arctic, Antarctic, and Alpine Research

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“…The percentage slope of the adjacent area was calculated in the same way. The Pro ruler function has been shown to be sufficiently accurate for use in digital elevation models (DEM) in hydrological studies (Rusli et al, ). The mean error in elevation has been shown by Wang et al .…”

Section: Methodsmentioning

confidence: 99%

The origin and persistence of alpine vernal ponds in mineral soils

Harrison‐Day

Atkinson

Kirkpatrick

2019

Earth Surf Processes Landf

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Little is known of the processes that create and maintain vernal ponds in mineral soils in alpine environments. On the Central Plateau, Tasmania, we tested the hypotheses that vernal pond complexes on mineral soils formed in response to the underlying topography of a glacio-fluvial plain; relate to present day topography; resulted from past damming by organic accumulation; are moulded by wind. The underlying topography did not relate to the surface ponds, nor were they on steeper slopes than adjacent areas without ponds. The morphology of the ponds and the morphological and edaphic characteristics of the pond complexes and adjacent areas are consistent with an origin by organic material damming. The strongest winds orientate most ponds, rather than the aspect of the slope. Sediments were preferentially caught on sticky traps to the northeast of the ponds, away from fierce prevailing southwesterly winds. Temperature measurements and fortnightly observation showed non-concordant patterns of variation in water levels in the ponds. We deduce that the complexes of vernal ponds may have formed in previous moister conditions more favourable to organic matter accumulation, possibly in the early Holocene, and are maintained by a faster rate of accumulation of mineral and organic particles in the tussock grassland adjacent to the ponds than in the ponds themselves.

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“…El incremento de la oferta de información topográfica en formato de Modelos Digitales de Elevación (MDE) derivados de sensores espaciales satelitales y aerotransportados, han empujado aún más el empleo de la modelación 2D (Yan et al, 2015). Los MDE son una de las principales entradas de datos de elevación tipo ráster para la modelación hidrodinámica 2D (Musa et al, 2015), en el cual para cada posición X,Y es contendida el valor de elevación Z dentro la matriz de información, y es obtenida comúnmente a partir de plataformas satelitales u aerotransportadas (Ruslin et al, 2014). Los MDE se clasifican dependiendo si consideran todos los elementos de la superficie (MDS) o solamente el suelo desnudo a nivel del terreno (MDT).…”

Section: Introductionunclassified

Modelación Hidráulica 2D de Inundaciones en Regiones con Escasez de Datos. El Caso del Delta del Río Ranchería, Riohacha-Colombia

2018

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ResumenSe planteó una estrategia metodológica que solventa la escasez de datos para la modelación 2D de inundaciones en un delta. Digitalizando la elevación disponible en Google Earth TM e integrada con secciones levantadas en el río y datos topográficos, se obtuvo una nube de puntos topográfica. Esta fue posteriormente interpolada a una red de triángulos irregular, y finalmente, la generación de un Modelo Digital del Terreno. Se simuló bidimensionalmente (IBER v2.3.2) un evento de inundación y una medida estructural (dique) para proteger una comunidad vulnerable. El desbordamiento se presentó solamente en el tramo final del cauce, por tanto, no influyó sobre el área urbana de la ciudad de Riohacha. El dique lograría evitar artificialmente las inundaciones en la zona protegida, pero aumentando el riesgo por inundación ante posibles fallas debido a crecidas de mayor magnitud. De acuerdo a los resultados, la metodología planteada es útil para el cálculo de áreas inundables en zonas deltaicas y apoyo a la toma decisiones en regiones con escases de datos. Palabras clave: modelación 2D; IBER; inundación; modelo digital de terreno 2D Hydraulic Flood Modeling in Data-Scarce Regions The Case of Ranchería River Delta, Riohacha-Colombia AbstractA methodological approach which overcomes the lack of data available for 2D hydrodynamic modeling in deltaic floodplains is proposed. By digitizing the elevation data available in Google Earth TM and integrating them with river cross sections data surveyed on the field, plus additional topographic data available, a topographic point cloud was obtained. This was later interpolated in a Triangulated Irregular Network, and finally, a Digital Terrain Model was generated. A two-dimensional simulation (with IBER v2.3.2) for a flood event together with a solution alternative including a structural measure (levee) to protect a vulnerable community were carried out. Overflow occurred only in the final stretch of the riverbed. Therefore, it did not influence the urban area of the city of Riohacha. The levee would artificially avoid the flooding on the target area for protection but increasing the flood risk due to possible failure that would occur when a swelling river occurs. Based on results, the proposed methodology is useful for determining flood prone areas in deltaic zones and well supports decision making in data-scarce regions.

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Google Earth's derived digital elevation model: A comparative assessment with Aster and SRTM data

Cited by 35 publications

References 3 publications

An inventory of rock glaciers in the central British Columbia Coast Mountains, Canada, from high resolution Google Earth imagery

An inventory of rock glaciers in the central British Columbia Coast Mountains, Canada, from high resolution Google Earth imagery

The origin and persistence of alpine vernal ponds in mineral soils

Modelación Hidráulica 2D de Inundaciones en Regiones con Escasez de Datos. El Caso del Delta del Río Ranchería, Riohacha-Colombia

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