Surveys and satellites: Evaluating crop condition monitoring strategies using field observations and vegetation health indices

Abstract

The ability to make reliable, data‐driven crop yield assessments for risk management depends on the quality of the underlying data. This study compares US state‐ and national‐level data from 1986 through 2023 for 10 major field crops using two widely applied approaches: the USDA survey‐based crop condition index (CCIndex) and satellite‐derived vegetation health (VH) indices. The goals are to characterize seasonal tendencies, quantify yield variance, and examine responses to climatic anomalies using both crop monitoring systems. Results indicate that the onset of natural senescence during the reproductive stage marks a critical turning point, as weekly VH indices correlate significantly with yield in the early to mid‐season but lose predictive skill as canopy greenness diminishes; conversely, the CCIndex maintains or even strengthens its yield association through the late season across most crops. Climate‐response analyses reveal that CCIndex ratings adequately capture the nonlinear effects of precipitation and temperatures, whereas VH response is weaker. Collectively, findings support a phenology‐aware blended monitoring strategy—leveraging VH indices for early detection and the CCIndex for late‐season yield relevance and agronomic nuance. This multi‐decadal, multi‐crop evaluation establishes a robust baseline for operational crop‐condition predictability and highlights opportunities to fuse survey and remote‐sensing data to enhance yield forecasting and climate resilience.