Results 11 to 20 of about 1,983 (164)

Detection of irrigation inhomogeneities in an olive grove using the NDRE vegetation index obtained from UAV images [PDF]

European Journal of Remote Sensing, 2019
We have developed a simple photogrammetric method to identify heterogeneous areas of irrigated olive groves and vineyard crops using a commercial multispectral camera mounted on an unmanned aerial vehicle (UAV).
J. Jorge, M. Vallbé, J. A. Soler
doaj   +2 more sources

Using Aerial Spectral Indices to Determine Fertility Rate and Timing in Winter Wheat [PDF]

Agriculture
Tiller density is indicative of the overall health of winter wheat (Triticum aestivum L.) and is used to determine in-season nitrogen (N) application.
Joseph Oakes, Maria Balota, Alexandre-Brice Cazenave, Wade Thomason   +3 more
doaj   +2 more sources

Sensitivity analysis of RapidEye spectral bands and derived vegetation indices for insect defoliation detection in pure Scots pine stands

iForest - Biogeosciences and Forestry, 2017
This study investigated the statistical relationship between defoliation in pine forests infested by nun moths (Lymantria monacha) and the spectral bands of the RapidEye sensor, including the derived normalized difference vegetation index (NDVI) and the ...
Marx A, Kleinschmit B
doaj   +2 more sources

Predicting Rice Grain Yield Based on Dynamic Changes in Vegetation Indexes during Early to Mid-Growth Stages

Remote Sensing, 2019
Predicting the grain yield during early to mid-growth stages is important for initial diagnosis of rice and quantitative regulation of topdressing. In this study, we conducted four experiments using different nitrogen (N) application rates (0⁻400 ...
Ke Zhang, Xiaokang Ge, Pengcheng Shen, Wanyu Li, Xiaojun Liu, Qiang Cao, Yan Zhu, Weixing Cao, Yongchao Tian   +8 more
doaj   +2 more sources

Design of Sliding Mode Autopilot with Steady-state Error Elimination for Autonomous Underwater Vehicles [PDF]

, 2006
Autonomous Underwater Vehicles (AUVs) have nonlinear and time-varying behaviour and unmodelled dynamics. This paper describes the design, development and evaluation of nonlinear sliding mode autopilot system for an AUV to control the speed, steering and ...
Shi, Juan, Juan Shi
core   +7 more sources

Spectral signature of leaf spot (Mycosphaerella fragariae) in strawberry plants (Fragaria x ananassa Duch) related to NDVI and NDRE index

, 2023
Introducción: El cultivo de fresa se ve seriamente afectado por diferentes enfermedades que resulta en disminución de la producción y de la calidad de la fruta.
Castellanos González, Leónides, Fajardo Rojas, Alexandra Estefania, Peláez Carrillo, Diego Alfonso   +2 more
core   +5 more sources

Porównanie wskaźników NDVI, NDRE, MSAVI i NDSI do wczesnej diagnozy problemów z plonem [PDF]

, 2023
In precision agriculture, it is possible to use satellite monitoring of fields. Satellite monitoring systems allow you to get free images with a resolution of up to 10 m per pixel, which is sufficient to determine the state of vegetation of plants on ...
Pushka, Olexandr, Kravchenko, Vasyl, Shchur, Taras, Kocira, Sławomir, Voitik, Andrii, Kutkovetska, Tetyana   +5 more
core   +1 more source

Yield Predictions of Four Hybrids of Maize (Zea mays) Using Multispectral Images Obtained from UAV in the Coast of Peru

Agronomy, 2022
Early assessment of crop development is a key aspect of precision agriculture. Shortening the time of response before a deficit of irrigation, nutrients and damage by diseases is one of the usual concerns in agriculture.
David Saravia, Wilian Salazar, Lamberto Valqui-Valqui, Javier Quille-Mamani, Rossana Porras-Jorge, Flor-Anita Corredor, Elgar Barboza, Héctor V. Vásquez, Andrés V. Casas Diaz, Carlos I. Arbizu   +9 more
doaj   +1 more source

Evaluation of Organic Camelina Crop Under Different Tillage Systems and Fertilization Types Using Proximal Remote Sensing

Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca: Horticulture, 2020
A field experiment was conducted in Southern Greece to assess Normalized Difference Vegetation Index (NDVI) and Red-Edge Normalized Difference Vegetation Index (NDRE) in estimating Camelina’s crop growth and yield parameters under different tillage ...
Foteini ANGELOPOULOU, Evangelos ANASTASIOU, Spyros FOUNTAS, Dimitrios BILALIS   +3 more
doaj   +1 more source

Evaluation of Three Portable Optical Sensors for Non-Destructive Diagnosis of Nitrogen Status in Winter Wheat

Sensors, 2021
The accurate estimation and timely diagnosis of crop nitrogen (N) status can facilitate in-season fertilizer management. In order to evaluate the performance of three leaf and canopy optical sensors in non-destructively diagnosing winter wheat N status ...
Jie Jiang, Cuicun Wang, Hui Wang, Zhaopeng Fu, Qiang Cao, Yongchao Tian, Yan Zhu, Weixing Cao, Xiaojun Liu   +8 more
doaj   +1 more source