Results 291 to 300 of about 51,150 (345)

The effects of wavelet compression on digital elevation models (DEMs)

IEEE International IEEE International IEEE International Geoscience and Remote Sensing Symposium, 2004. IGARSS '04. Proceedings. 2004, 2004
This paper investigates the effects of lossy compression on floating-point digital elevation models using the discrete wavelet transform. The compression of elevation data poses a different set of problems and concerns than does the compression of images.
openaire   +1 more source

Development of digital elevation models (DEMs) for agricultural applications

2018
Topographic data collected using RTK-DGPS-equipped farm vehicles during field operations could add additional benefits to the original capital investment in the equipment through the development of high accuracy field-DEMs. Repeated surveys of elevation data from repeated field operations may improve DEM accuracy over time.
openaire   +2 more sources

An evaluation of available digital elevation models (DEMs) for geomorphological feature analysis

Environmental Earth Sciences, 2020
A digital elevation model (DEM) is an essential dataset for many land feature analyses, such as geomorphological feature analyses, which are very important for many types of studies. The present study involved the evaluation of five of the most common DEMs and their derived geomorphological features in the Humrat Assahn basin.
Majed Ibrahim, Alia Al-Mashaqbah, Barbara Koch, Pawan Datta   +3 more
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A digital elevation model based method for a rapid estimation of flood inundation depth

Journal of Flood Risk Management, 2019
In recent years, the acquisition of data from multiple sources, together with improvements in computational capabilities, has allowed to improve our understanding on natural hazard through new approaches based on machine learning and Big Data analytics ...
S. Manfreda, C. Samela
semanticscholar   +1 more source

Evaluation of TanDEM-X 90 m Digital Elevation Model

International Journal of Remote Sensing, 2019
German Aerospace Center (DLR), EADS Astrium GmbH and Infoterra GmbH alliance came up with the idea of taking DTED-2 (Digital terrain elevation data, level-2) specifications to even higher standard of HRTE-3 (High resolution terrain elevation, level-3) in
A. Altunel
semanticscholar   +1 more source

Using Iterative Orthophoto Refinements to correct Digital Elevation Models (DEM's)

1991
Abstract : A new technique is described that can be used to correct the digital elevation data obtained using digital correlation methods on terrain stereoimages. The new technique takes advantage of the speed of modern computers and the inherent geometric relationship between elevation data and orthophotographs to provide speedy, accurate and nearly ...
openaire   +1 more source

Digital elevation model (DEM) and shaded relief image of Okmok Caldera, 2010

2012
In response to significant morphologic changes in Okmok Caldera due to the phreatomagmatic eruption of Okmok volcano in 2009, a new digital elevation model was acquired to document and quantitatively assess the new volcanic features and altered hydrology within the caldera.This DEM dataset provides elevation data derived from a stereo pair of Worldview-
J. R. Schaefer, J. F. Larsen, J. A. Unema   +2 more
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Machine Learning for Enhancement of Global Digital Elevation Models (DEMs)

2023
Chukwuma John Okolie, Mills, Jon, Adedayo Kelvin Adeleke, Smit, Julian Lloyd   +3 more
openaire   +1 more source

Accuracy assessment of a low-cost UAV derived digital elevation model (DEM) in a highly broken and vegetated terrain

Measurement, 2019
Emre Akturk, A. Altunel
semanticscholar   +1 more source

Effects of vertical accuracy of digital elevation model (DEM) data on automatic lineaments extraction from shaded DEM

Advances in Space Research, 2019
A. Soliman, Ling Han
semanticscholar   +1 more source