By means of ab-initio calculations on the basis of the FPLAPW method, we compared the energy loss near edge structure (ELNES) of carbon K edges in crystalline phenanthrene and its isomer, anthracene. In these two organic compounds, different non-equivalent carbon atoms can result in distinct K edge spectra due to the different carbon-carbon bond lengths, as a characteristic behavior of the mole...

Soil fertility affects crop yield and quality. A quick, accurate evaluation of soil is crucial for agricultural production. Few satellite image-based studies have quantified during the growth period. Therefore, this study proposes a new approach to quantitative fertility. Firstly, optimal spectral variables were selected using integration an extreme gradient boosting (XGBoost) algorithm with va...

Remote sensing identification and classification of crops is the use remote for estimating crop planting area timely accurate monitoring growth plant diseases insect pests in advance to make product output estimate key premise study using Sentinel-1 Sentinel-2 satellite, by random forest algorithm, traditional optical wavelengths vegetation index The backward scattering field red edge informati...

Near-nadir observations by the Multispectral Instrument (MSI) onboard the Sentinel-2 and the Operational Land Imager (OLI) onboard Landsat 8 were collected during two Simultaneous Nadir Overpasses (SNO). Multispectral images with 10, 20, and 30 m resolution from a spatially uniform area in the Saharan desert were acquired for direct comparison of MSI and OLI TopOf-Atmosphere (TOA) reflectances....

Surface soil moisture (SSM) is a major factor that affects crop growth. Combined microwave and optical data have been widely used to improve the accuracy of SSM retrievals. However, influence vegetation indices derived from red-edge spectral bands multi-spectral on retrieval has not sufficiently analyzed. In this study, we retrieved wheat-covered surfaces using Sentinel-1/2 data. First, modifie...