Results 21 to 30 of about 313 (137)

The importance of digital elevation model accuracy in X_CO2 retrievals: improving the Orbiting Carbon Observatory 2 Atmospheric Carbon Observations from Space version 11 retrieval product [PDF]

Atmospheric Measurement Techniques
Knowledge of surface pressure is essential for calculating column-averaged dry-air mole fractions of trace gases, such as CO2 (XCO2). In the NASA Orbiting Carbon Observatory 2 (OCO-2) Atmospheric Carbon Observations from Space (ACOS) retrieval algorithm,
N. Jacobs, N. Jacobs, C. W. O'Dell, T. E. Taylor, T. L. Logan, B. Byrne, M. Kiel, R. Kivi, P. Heikkinen, A. Merrelli, V. H. Payne, A. Chatterjee   +11 more
doaj   +2 more sources

Sensitivity Analysis of Digital Elevation Model In The Use of Hydrological Applications [PDF]

Rekayasa
Assessing DEMs is a critical step in hydrological applications to reduce uncertainties. This study assesses the uncertainty level of using several DEM products by comparing the derivation of watershed morphometric information in the form of hydrological ...
Sahid Sahid, Haikal Muhammad Ihsan, Muhammad Abia Saefulloh, Wiedad Diya Ulhaq   +3 more
doaj   +2 more sources

The New Landsat Collection-2 Digital Elevation Model

Remote Sensing, 2020
The Landsat Collection-2 distribution introduces a new global Digital Elevation Model (DEM) for scene orthorectification. The new global DEM is a composite of the latest and most accurate freely available DEM sources and will include reprocessed Shuttle ...
Rajagopalan Rengarajan
exaly   +3 more sources

A Global Evaluation of Radar-Derived Digital Elevation Models: SRTM, NASADEM, and GLO-30

Journal of Geophysical Research G: Biogeosciences
AbstractThis study evaluates global radar‐derived digital elevation models (DEMs), namely the Shuttle Radar Topography Mission (SRTM), NASADEM and GLO‐30 DEMs. We evaluate their accuracy over bare‐earth terrain and characterize elevation biases induced by forests using global Lidar measurements from the Ice, Cloud, and Land Elevation Satellite (ICESat)'
Charlie Marshak, Maxim Neumann, Marc Simard   +2 more
exaly   +2 more sources

Validation of Recent DSM/DEM/DBMs in Test Areas in Greece Using Spirit Leveling, GNSS, Gravity and Echo Sounding Measurements

ISPRS International Journal of Geo-Information, 2023
Recent Digital Surface, Elevation, and Bathymetric Models (DSM/DEM/DBM) aim to provide high-resolution and accurate height and depth information needed for a variety of surveying, geodetic, geophysical, and other applications. In this study, first we aim
Vassilios Grigoriadis, Vassilios D. Andritsanos, Dimitrios Natsiopoulos   +2 more
exaly   +3 more sources

COMPARATIVE ANALYSIS OF GLOBAL DIGITAL ELEVATION MODELS AND ULTRA-PROMINENT MOUNTAIN PEAKS [PDF]

ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2016
Global Digital Elevation Models (GDEMs) are datasets of vital importance for regional-scale analysis in areas such as geomorphology, [paleo]climatology, oceanography and biodiversity. In this work I present a comparative assessment of the datasets ETOPO1
C. H. Grohmann
doaj   +2 more sources

Vertical Accuracy Assessment and Improvement of Five High-Resolution Open-Source Digital Elevation Models Using ICESat-2 Data and Random Forest: Case Study on Chongqing, China

Remote Sensing
Digital elevation models (DEMs) are widely used in digital terrain analysis, global change research, digital Earth applications, and studies concerning natural disasters.
Weifeng Xu, Jun Li, Dailiang Peng, Hongyue Yin, Jinge Jiang, Hongxuan Xia, Di Wen   +6 more
doaj   +2 more sources

Evaluating the Performance of SRTM, NASADEM, and Copernicus DEM: A Case Study of the Perlis State Region

Built Environment Journal
Digital Elevation Models (DEMs) are fundamental tools for various applications including flood risk mapping, geoid modelling, and terrain analysis. The increasing availability of global DEMs (GDEMs) such as the Shuttle Radar Topography Mission (SRTM), NASADEM, and Copernicus DEM (CopDEM) has enhanced the accessibility of elevation data worldwide ...
Yong Chien Zheng, Ami Hassan Md Din
exaly   +2 more sources

Accelerated glacier mass loss in the southeastern Tibetan Plateau since the 1970s

Advances in Climate Change Research, 2023
The southeastern Tibetan Plateau (SETP) is a region in High Mountain Asia with the most serious glacier mass loss. However, long-term and large regional-scale studies that estimate glacier mass balance in this area remain limited.
Luo lanhua, Chang-Qing Ke
exaly   +3 more sources

Unlocking Tropical Forest Complexity: How Tree Assemblages in Secondary Forests Boost Biodiversity Conservation. [PDF]

Ecol Evol
Secondary forests are crucial for achieving COP15/16 conservation goals. An operational national approach was developed to identify and characterise forest ecosystems based on the dominant tree species in the canopy, serving as indicators for ecosystem extent and condition.
Souza Oliveira M, Lenormand M, Luque S, Zamora NA, Alleaume S, Aguilar Porras AC, Castillo MU, Chacón-Madrigal E, Delgado D, Hernández Sánchez LG, Ngo Bieng MA, Quesada-Monge R, Solano GS, Zúñiga PM.   +13 more
europepmc   +2 more sources