Estimation of the vegetal cover fraction in corn from information obtained with remote sensing
DOI:
https://doi.org/10.24850/j-tyca-14-05-08Keywords:
Vegetation cover fraction (FCV), vegetation indices (IV), Landsat 8, radiometer, CanopeoAbstract
The Fractional vegetation cover (FVC) is a biophysical variable related to biomass, leaf area index and crop coefficient, among others. Currently, with the wide availability of satellite images, it is possible to estimate FVC extensively using vegetation indices (VI). However, it is important to examine the relationship between VCF measured in the field and that estimated with satellite imagery to determine its reliability. The objective of this study was to examine the feasibility of estimating FVC using different VIs (NDVI, SR, SAVI and MSAVI), calculated using radiometric information and Landsat 8 imagery, and to determine the differences that exist when estimating FCV with both sources of information. The radiometric information was collected in six corn plots located in the municipality of Texcoco, State of Mexico. The results showed a good fit of the VI calculated with field information when the FVC was less than 60 %. The correlation between the FVC measured in the field and the indices estimated with satellite imagery had R2 values greater than 0.78, being slightly higher in the case of the NDVIL (R2 = 0.89), a value that suggests an acceptable degree of adjustment. It is concluded that it is feasible to estimate the FCV in a maize crop using spectral images from Landsat 8. The best fit between the field VI and the VI calculated with Landsat 8 data, for the conditions of this study, corresponded to the NDVI.
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