Digital hemispherical photography(DHP) is a valuable tool for monitoring leaf area index(LAI), a key factor in ecosystem productivity and climate interactions. We compared DHP with litter traps in a temperate forest and found that at a view zenith angle around 20°, both methods aligned best. We applied a calibration model to assess site variability which significantly improved accuracy. Our findings enhance the reliability of ground-based LAI monitoring, supporting better ecosystem assessments.