Identify overlapping active fire pixels detected by MODIS and VIIRS within ~1 km and same time period.

Paired dataset: {FRP_MODIS,i, FRP_VIIRS,i}, i=1..n

δ_i = (FRP_VIIRS,i - FRP_MODIS,i) / FRP_MODIS,i

Mean fractional difference (calibration factor r2): r2 = (1/n) Σ δ_i

FRP_MODIS,calib = FRP_MODIS × (1 + r2)

Adjust MODIS FRP to align with VIIRS statistically.

Plot calibrated MODIS vs VIIRS FRP.

Calculate statistical agreement (R², RMSE).

Fuse calibrated MODIS and VIIRS FRP.

Prefer VIIRS values; fill gaps with calibrated MODIS.

Aggregate into common spatial & temporal grid.