Analysis of agronomic drought over North Africa using remote sensing satellite data

2021 ◽  
Author(s):  
Mehrez Zribi ◽  
Simon Nativel ◽  
Michel Le Page
Keyword(s):  
Remote Sensing ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
North Africa ◽  
Vegetation Cover ◽  
Remote Sensing Data ◽  
Study Region ◽  
Semi Arid Region ◽  
Anomaly Index

<p>This paper aims to analyze the agronomic drought in a highly anthropogenic  semi-arid region, North Africa. In the context of the Mediterranean climate, characterized by frequent droughts, North Africa is particularly affected. Indeed, in addition to this climatic aspect, it is one of the areas most affected by water scarcity in the world. Thus, understanding and describing agronomic drought is essential. The proposed study is based on remote sensing data from TERRA-MODIS and ASCAT satellite, describing the dynamics of vegetation cover and soil water content through NDVI and SWI indices. Two indices are analyzed, the Vegetation Anomaly Index (VAI) and the Moisture Anomaly Index (MAI). The dynamics of the VAI is analyzed for different types of regions (agircultural, forest areas). The contribution of vegetation cover is combined with the effect of soil water content through a new drought index combining the VAI and MAI. A discussion of this combination is proposed on different study areas in the study region. It illustrates the complementarity of these two informations in analysis of agronomic drought.</p>

scholarly journals Analysis of Agronomic Drought in a Highly Anthropogenic Context Based on Satellite Monitoring of Vegetation and Soil Moisture

2021 ◽  
Vol 13 (14) ◽  
pp. 2698
Author(s):  
Mehrez Zribi ◽  
Simon Nativel ◽  
Michel Le Page
Keyword(s):  
Land Cover ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Vegetation Cover ◽  
Drought Index ◽  
Global Analysis ◽  
Satellite Monitoring ◽  
Study Region ◽  
Anomaly Index

This paper aims to analyze agronomic drought in a highly anthropogenic, semiarid region, the western Mediterranean region. The proposed study is based on Moderate-Resolution Imaging Spectroradiometer (MODIS) and Advanced SCATterometer (ASCAT) satellite data describing the dynamics of vegetation cover and soil water content through the Normalized Difference Vegetation Index (NDVI) and Soil Water Index (SWI). Two drought indices were analyzed: the Vegetation Anomaly Index (VAI) and the Moisture Anomaly Index (MAI). The dynamics of the VAI were analyzed as a function of land cover deduced from the Copernicus land cover map. The effect of land cover and anthropogenic agricultural activities such as irrigation on the estimation of the drought index VAI was analyzed. The VAI dynamics were very similar for the shrub and forest classes. The contribution of vegetation cover (VAI) was combined with the effect of soil water content (MAI) through a new drought index called the global drought index (GDI) to conduct a global analysis of drought conditions. The implementation of this combination on different test areas in the study region is discussed.

scholarly journals Improved simulation of soil water content by the combination of ground and remote sensing data

2014 ◽  
Vol 47 (1) ◽  
pp. 739-751 ◽  
Author(s):  
Lorenzo Gardin ◽  
Piero Battista ◽  
Lorenzo Bottai ◽  
Marta Chiesi ◽  
Luca Fibbi ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Remote Sensing Data ◽  
Sensing Data

scholarly journals Soil water content and actual evapotranspiration predictions using regression algorithms and remote sensing data

2020 ◽  
Vol 241 ◽  
pp. 106346
Author(s):  
Roberto Filgueiras ◽  
Thomé Simpliciano Almeida ◽  
Everardo Chartuni Mantovani ◽  
Santos Henrique Brant Dias ◽  
Elpídio Inácio Fernandes-Filho ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Remote Sensing Data ◽  
Actual Evapotranspiration ◽  
Sensing Data ◽  
Regression Algorithms

Inverting Study on Soil Water Content Based on Harmonic Analysis and Hyperspectral Remote Sensing

2017 ◽  
Vol 37 (10) ◽  
pp. 1028001 ◽  
Author(s):  
姜雪芹 Jiang Xueqin ◽  
叶 勤 Ye Qin ◽  
林 怡 Lin Yi ◽  
李西灿 Li Xican
Keyword(s):  
Remote Sensing ◽  
Harmonic Analysis ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Hyperspectral Remote Sensing

scholarly journals Separation of soil and canopy reflectance signatures of Mid German agricultural soils

2011 ◽  
Vol 51 (No, 7) ◽  
pp. 296-303 ◽  
Author(s):  
T. Behrens ◽  
K. Gregor ◽  
W. Diepenbrock
Keyword(s):  
Remote Sensing ◽  
Soil Properties ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content ◽  
Vegetation Index ◽  
Near Infrared ◽  
Field Experiments ◽  
Agricultural Soils ◽  
Soil Reflectance

Remote sensing can provide visual indications of crop growth during production season. In past, spectral optical estimations were well performed in the ability to be correlated with crop and soil properties but were not consistent within the whole production season. To better quantify vegetation properties gathered via remote sensing, models of soil reflectance under changing moisture conditions are needed. Signatures of reflected radiation were acquired for several Mid German agricultural soils in laboratory and field experiments. Results were evaluated at near-infrared spectral region at the wavelength of 850 nm. The selected soils represented different soil colors and brightness values reflecting a broad range of soil properties. At the wavelength of 850 nm soil reflectance ranged between 10% (black peat) and 74% (white quartz sand). The reflectance of topsoils varied from 21% to 32%. An interrelation was found between soil brightness rating values and spectral optical reflectance values in form of a linear regression. Increases of soil water content from 0% to 25% decreased signatures of soil reflectance at 850 nm of two different soil types about 40%. The interrelation of soil reflectance and soil moisture revealed a non-linear exponential function. Using knowledge of the individual signature of soil reflectance as well as the soil water content at the measurement, soil reflectance could be predicted. As a result, a clear separation is established between soil reflectance and reflectance of the vegetation cover if the vegetation index is known.

Predicting Soil Water Content through Remote Sensing of Vegetative Characteristics in a Turfgrass System

Crop Science ◽  
2008 ◽  
Vol 48 (2) ◽  
pp. 763-770 ◽  
Author(s):  
Jason K. Dettman-Kruse ◽  
Nick E. Christians ◽  
Michael H. Chaplin
Keyword(s):  
Remote Sensing ◽  
Water Content ◽  
Soil Water ◽  
Soil Water Content
Sign in / Sign up

Export Citation Format

Share Document