The influence of surface canopy water on the relationship between L-band backscatter and biophysical variables in agricultural monitoring

• Surface Canopy Water (SCW) affects radar backscatter, cross ratio and RVI. SCW the relations between L-band observables crop biophysical variables. has a confounding influence on VOD estimation. Overpass time daily patterns in affect retrieval of parameters. The presence surface water canopy backscatter. However, its relationship backscatter parameters not been investigated. aim this study was to quantify variables interest agricultural monitoring. In study, we investigated effect co- cross-polarized ratios (VH/VV HV/HH), vegetation index (RVI) dry biomass, content (VWC), plant height leaf area (LAI). addition, estimated optical depth (VOD) with internal VWC analysis based data collected during field experiment Florida, USA 2018. A corn scanned truck-mounted, fully polarimetric, along continuous monitoring (dew, interception) soil moisture every 15 min for 58 days. pre-dawn destructive sampling conducted measure biomass. Results showed that can increase up 2 dB lower (CRs) Spearman's rank correlations were, average, 0.2 higher compared wet vegetation. from generally than those vegetation, which led different fitting parameter (so-called b ) values linear fit VWC. results presented here underscore importance considering particular, they highlight overpass time, impact dew interception have interest.