Results 61 to 70 of about 940 (132)

Simultaneous Generation of Topographic Models and Manning Roughness Coefficient Maps From Tri‐Stereoscopic Satellite Images: Application to the Huarmey River, Peru

The Photogrammetric Record, Volume 41, Issue 195, July‐September 2026.
Tri‐stereoscopic PeruSat‐1 imagery enables the simultaneous generation of 0.70 m‐resolution topography and spatially distributed Manning roughness maps, achieving 0.434 m vertical accuracy. Integrated into HEC‐RAS, these products provide consistent, high‐resolution inputs that improve hydraulic modelling and flood risk assessment in data‐scarce river ...
Jorge L. Miranda‐Pita, Pedro A. Plaza‐Álvarez, Jorge Lopez‐Rebollo, Diego González‐Aguilera   +3 more
wiley   +1 more source

Evaluation of the Accuracy of Digital Elevation Model Produced from Different Open Source Data

Journal of Engineering, 2019
This study aims to estimate the accuracy of digital elevation models (DEM) which are created with exploitation of open source Google Earth data and comparing with the widely available DEM datasets, Shuttle Radar Topography Mission (SRTM), version 3, and ...
Raghad Hadi Hasan
doaj   +1 more source

Mapping of slopes for the operation of agricultural harvesters in Bandeirantes Municipality (PR)

Semina: Ciências Agrárias, 2017
The slope of terrain represents a risk factor for mechanized harvesting, leading to impediments or restrictions on agricultural operations, or even to machines toppling over in the field.
Gustavo Rodrigues Gimenes, Rone Batista Oliveira, Alessandra Fagioli da Silva, Luiz Carlos Reis, Teresinha Esteves da Silveira Reis   +4 more
doaj   +1 more source

Aplicación de percepción remota para la detección de cambios en la cobertura boscosa de la reserva ecológica Mache-Chindul

La Técnica: Revista de las Agrociencias, 2016
La Reserva Ecológica Mache-Chindul (REMACH) es una importante área estatal de vegetación natural de la costa norte de Ecuador. Esta investigación tiene como objetivo determinar cambios de la cobertura boscosa entre los años 1998 y 2004 para cuantificar ...
José Muñoz Marcillo, Elías Cuasquer Fuel, Oscar Moncayo Carreño, Diana Delgado Campuzano   +3 more
doaj   +1 more source

Evaluating the Vertical Accuracy of Global DEMs Using ICESat-2 and Its Cascading Impact on HAND-Based Flood Modeling in a Low-Gradient Coastal Plain

Remote Sensing
Driven by climate change and population growth, coastal flood risk is rising, making high-precision Digital Elevation Models (DEMs) essential for inundation simulation and risk assessment.
Yiming Sun, Dewei Wang, Xue Li, Wenli Qiao   +3 more
doaj   +1 more source

Vertical accuracy evaluation of freely available latest high-resolution (30 m) global digital elevation models over Cameroon (Central Africa) with GPS/leveling ground control points.

International Journal of Digital Earth, 2019
Digital Elevation Models (DEMs) contain topographic relief data that are vital for many geoscience applications. This study relies on the vertical accuracy of publicly available latest high-resolution (30 m) global DEMs over Cameroon. These models are (1)
Loudi Yap, Ludovic Houetchak Kandé, Robert Nouayou, Joseph Kamguia, Nasser Abdou Ngouh, Marie Brigitte Makuate   +5 more
doaj   +1 more source

ASSESSING DATA QUALITY OF REMOTELY-SENSED DEMs IN A HUNGARIAN SAMPLE AREA [PDF]

Acta Geographica Debrecina. Landscape & Environment Series, 2013
Nowadays the free-access digital elevation models are getting more and more popular. The SRTM and ASTER GDEM databases are the most widespread. However, there are numerous situations and weaknesses we have to take into account during their usage, such ...
GERGELY SZABÓ, NIKOLETTA MECSER, ANITA KARIKA   +2 more
doaj  

Assessment of the global Copernicus, NASADEM, ASTER and AW3D digital elevation models in Central and Southern Africa

Geo-spatial Information Science
Validation studies of global Digital Elevation Models (DEMs) in the existing literature are limited by the diversity and spread of landscapes, terrain types considered and sparseness of groundtruth.
Chukwuma J. Okolie, Jon P. Mills, Adedayo K. Adeleke, Julian L. Smit, Maria V. Peppa, Arif O. Altunel, Ikenna D. Arungwa   +6 more
doaj   +1 more source

Accuracy analysis and improvement of worldwide elevation models by ICESat-2 data

ISPRS Open Journal of Photogrammetry and Remote Sensing
Global or near global elevation models than TanDEM-X Edited Digital Elevation Model (EDEM), ALOS World 3D (AW3D), SRTM and ASTER GDEM (GDEM) show some systematic errors which can be determined and respected by accurate reference Digital Elevation Models (
Karsten Jacobsen, Gürcan Büyüksalih, Cem Gazioglu   +2 more
doaj   +1 more source

ecolo-zip: A global, rich and granular characterization of biogeophysical ecology for 1.5 million postal codes. [PDF]

Sci Data, 2023
Willinger D, Götz FM, Stieger S.
europepmc   +1 more source