Listar por tema "Vegetation"
Mostrando ítems 1-20 de 20
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Assessing Durum Wheat Yield through Sentinel-2 Imagery: A Machine Learning Approach
(2022)Two modeling approaches for the estimation of durum wheat yield based on Sentinel-2 data are presented for 66 fields across three growing periods. In the first approach, a previously developed multiple linear regression ... -
Crop reflectance measurements for nitrogen deficiency detection in a soilless tomato crop
(2018)Early detection of nitrogen deficit stress is essential to effectively and precisely manage crop production under greenhouse conditions. This article demonstrates the use of hyperspectral machine vision as a non-contact ... -
Drought Assessment in Nestos River Basin (N. Greece) for the Period 1955-2018
(2022)Drought is a significant meteorological phenomenon that can seriously impact natural ecosystems. Drought assessment and monitoring should be continuous in regions of high ecological importance, for the conservation of ... -
The Effect of Flexible Vegetation in Gravity Currents with Large Salinity in Composite Cross Section
(2022)In this study experiments in a laboratory tank to examine the effect of bed with vegetation on the motion of gravity currents between fresh and salt water with high salinity were performed. The shape of the tank was composite ... -
Evaluation and cross-comparison of vegetation indices for crop monitoring from sentinel-2 and worldview-2 images
(2017)Farmers throughout the world are constantly searching for ways to maximize their returns. Remote Sensing applications are designed to provide farmers with timely crop monitoring and production information. Such information ... -
Experimental and Numerical Study of Turbulent Flow in Open Channels with Impermeable and Porous Bed
(2016)In order to experimentally and numerically investigate turbulent flow in an open channel with porous (vegetated) and impermeable bed 2D Particle Image Velocimetry (PIV) and a Computational Fluid Dynamical (CFD) model were ... -
Field scale assessment of the tsharp technique for thermal sharpening of modis satellite images using venµs and sentinel-2-derived ndvi
(2021)Remotely sensed-based surface temperature is an important tool for crop monitoring and has great potential for improving irrigation management. However, current thermal satellite platforms do not display the fine spatial ... -
Further adjustment of the Defense Meteorological Satellite Program - Operational Linescan System using radar data
(2019)In the past, the Defense Meteorological Satellite Program - Operational Linescan System (DSMP/OLS) data have been successfully adjusted based on the presence of vegetation in each pixel. We propose a further adjustment ... -
Hybrid methodology for the estimation of crop coefficients based on satellite imagery and ground-based measurements
(2019)The objective of the current study was the investigation of specific relationships between crop coefficients and vegetation indices (VI) computed at the water-limited environment of Lake Karla Watershed, Thessaly, in central ... -
The impact of the instrument in velocity measurements in an open channel with a porous bed
(2017)In this study, the impact of the type of instrument used [hot-film anemometry and particle image velocimetry (PIV)] in velocity measurements in open channels with a porous bed is investigated. Individual experiments using ... -
The influence of different types of permeable bed (Flexible vegetation and inflexible rod bundle) in gravity currents
(2017)In this study, experiments were performed in a laboratory tank to investigate the effect of a permeable bed (flexible or inflexible) on the movement of gravity currents. The vegetation in the bed of the laboratory tank was ... -
MONITORING CASTOR BEANS MATURITY VIA REMOTE SENSING
(2022)Castor is a crop with an evergreen habit so artificial induced ripening is an essential precondition for mechanical harvesting of new dwarf annual hybrids. Plants water content impose a determinant effect both on preharvest ... -
Numerical modelling and analysis of turbulent flow in an open channel with submerged vegetation
(2017)Turbulent flow in an open channel whose bed is covered with vegetation is studied. Vegetation has been modeled by a series of small diameter rigid cylinders protruded vertically from the channel bed. 3-D computations were ... -
Remotely-Sensed innovative approach for the cumulative meteorological effects on cotton production
(2004)In this study an innovative approach for investigating the accumulated meteorological effects on cotton production during the growing season is presented. The quantification of the meteorological effects is based on the ... -
The role of spatial and spectral resolution on the effectiveness of satellite-based vegetation indices
(2016)Remote Sensing applications are designed to provide farmers with timely crop monitoring and production information. Such information can be used to identify crop needs or health problems and provide solutions for a better ... -
A study of flow in open channels with vegetation: Experiments and numerical models
(2017)In this study, the flow in open channels with vegetation was experimentally and numerically investigated. Particle image velocimetry (PIV) measurements and a computational fluid dynamics model are presented. In order to ... -
Thermal environment of urban schoolyards: Current and future design with respect to children’s thermal comfort
(2020)Urban outdoor thermal conditions, and its impacts on the health and well‐being for the city inhabitants have reached increased attention among biometeorological studies during the last two decades. Children are considered ... -
Transition from permeable to impermeable beds and vice versa in open channels: Effects on the velocity distribution of turbulent flow
(2014)This study investigates the impact of permeable to impermeable (and vice versa) bed transition on the velocity distribution of turbulent flow in an open channel. This experimental investigation is based on the 2D Particle ... -
Vegetation indices: Advances made in biomass estimation and vegetation monitoring in the last 30 years
(2006)During the last 30 years Vegetation Indices (VI) have been extensively used for tracing and monitoring vegetation conditions, such as health, growth levels, production, water and nutrients stress, etc. In this paper the ... -
Water Balance of Forested Mountainous Watersheds using Satellite Derived Actual Evapotranspiration
(2004)The use of actual evapotranspiration derived by satellite data at watershed scale in water balance modelling of forested mountainous watersheds is studied. Mean monthly maximum composites of the Normalized Difference ...