Results 1 to 10 of about 199,504 (303)

Drought Monitoring With Spectral Indices Calculated From Modis Satellite Images In Hungary [PDF]

open access: yesJournal of Environmental Geography, 2015
In this study a new remote sensing drought index called Difference Drought Index (DDI) was introduced. DDI was calculated from the Terra satellite’s MODIS sensor surface reflectance data using visible red, near-infrared and short-wave-infrared spectral ...
Gulácsi András, Kovács Ferenc
doaj   +4 more sources

Rapid Identification of Main Vegetation Types in the Lingkong Mountain Nature Reserve Based on Multi-Temporal Modified Vegetation Indices [PDF]

open access: yesSensors, 2023
Nature reserves are among the most bio-diverse regions worldwide, and rapid and accurate identification is a requisite for their management. Based on the multi-temporal Sentinel-2 dataset, this study presents three multi-temporal modified vegetation ...
Wenjing Fang   +4 more
doaj   +2 more sources

Evaluation of Broadband and Narrowband Vegetation Indices for the Identification of Archaeological Crop Marks

open access: yesRemote Sensing, 2012
Several studies in the past have examined the spectral capability of multispectral and hyperspectral imagery for the identification of crop marks, while recent studies have applied different vegetation indices in order to support remote sensing ...
Diofantos G. Hadjimitsis   +2 more
doaj   +3 more sources

Comparison the accuracies of different spectral indices for estimation of vegetation cover fraction in sparse vegetated areas

open access: yesEgyptian Journal of Remote Sensing and Space Sciences, 2011
Quantitative estimation of canopy biophysical variables are very important in different studies such as meteorology, agriculture and ecology, so knowledge of the spatial and temporal distribution of these variables would be highly beneficial.
Susan Barati   +4 more
doaj   +3 more sources

Assessing the Robustness of Vegetation Indices to Estimate Wheat N in Mediterranean Environments

open access: yesRemote Sensing, 2014
Remotely sensed vegetation indices have been extensively used to quantify plant and soil characteristics. The objectives of this study were to: (i) compare vegetation indices developed at different scales for measuring canopy N content (g∙N∙m−2) and ...
Davide Cammarano   +3 more
doaj   +3 more sources

State of Major Vegetation Indices in Precision Agriculture Studies Indexed in Web of Science: A Review

open access: yesAgriculture, 2023
Vegetation indices provide information for various precision-agriculture practices, by providing quantitative data about crop growth and health. To provide a concise and up-to-date review of vegetation indices in precision agriculture, this study focused
Dorijan Radočaj   +3 more
doaj   +1 more source

UAV-Derived Spectral Indices for the Evaluation of the Condition of Rye in Long-Term Field Experiments

open access: yesAgriculture, 2022
The aim of the study was to evaluate the effect of various fertilization treatments, including nitrogen, potassium and phosphorus fertilization, in long-term experiments for selected UAV (unmanned aerial vehicle)-derived spectral vegetation indices (NDVI—
Elżbieta Wójcik-Gront   +2 more
doaj   +1 more source

VEGETATION INDICES FOR IRRIGATED CORN MONITORING [PDF]

open access: yesEngenharia Agrícola, 2020
Monitoring of large agricultural lands is often hampered by data collection logistics at field level. To solve such a problem, remote sensing techniques have been used to estimate vegetation indices, which can subsidize crop management decision-making ...
Francisco C. G. Alvino   +4 more
doaj   +1 more source

Estimating the Reduction in Cover Crop Vitality Followed by Pelargonic Acid Application Using Drone Imagery

open access: yesAgronomy, 2023
Cultivation of cover crops is a valuable practice in sustainable agriculture. In cover crop management, the method of desiccation is an important consideration, and one widely used method for this is the application of glyphosate.
Eliyeh Ganji   +2 more
doaj   +1 more source

UAV Hyperspectral Data Combined with Machine Learning for Winter Wheat Canopy SPAD Values Estimation

open access: yesRemote Sensing, 2023
Chlorophyll is an important indicator for monitoring crop growth and is vital for agricultural management. Therefore, rapid and accurate estimation of chlorophyll content is important for decision support in precision agriculture to accurately monitor ...
Qi Wang   +5 more
doaj   +1 more source

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