Landsat/Sentinel Cross calibration data for Australia

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observations_bba.parquet Co-incident Landsat 7 ETM+ and Sentinel-2 surface reflectance pairs, using the JRSRP S2ARD product (Sentinel-2 L2A with BRDF adjustment). Each row represents a matched pixel observation, containing raw surface reflectance for 6 spectral bands from both sensors (blue, green, red, NIR, SWIR1, SWIR2), acquisition date, day of year, year, UTM easting/northing, UTM zone, WGS84 lon/lat, and Sentinel-2 satellite ID.This is the primary dataset for cross-sensor fusion and fractional cover analysis, and represents the recommended Sentinel-2 processing chain for use with the JRSRP fractional cover model. observations_aba.parquet Co-incident Landsat 7 ETM+ and Sentinel-2 surface reflectance pairs, using the legacy in-house Sentinel-2 surface reflectance product (L1C-based atmospheric correction with BRDF adjustment).Shares an identical schema with observations_bba, allowing direct comparison of the two Sentinel-2 processing chains against the same Landsat 7 ETM+ baseline.A systematic seasonal bias has been identified in this product relative to Landsat, which motivated the development of the BBA processing chain. Retained here to support ongoing comparison and validation work. calibration_coefficients.parquet Linear regression coefficients for fusing Sentinel-2 BBA surface reflectance to the Landsat 7 ETM+ baseline, derived from the co-incident observation pairs in observations_bba. Coefficients are provided per spectral band (blue, green, red, NIR08, SWIR16, SWIR22) and per Sentinel-2 satellite, reflecting the sensor-specific calibration approach.To apply: calibrated_reflectance = intercept + slope × s2_reflectance.Applying these coefficients is a prerequisite for fractional cover prediction using the JRSRP model, and for meaningful comparison between Sentinel-2 and Landsat time series. dea_nbart.parquet Geoscience Australia DEA Landsat NBART surface reflectance extracted at co-incident Landsat/Sentinel-2 observation points, provided as an independent reference product for validation.Contains six spectral bands (blue, green, red, NIR, SWIR-1, SWIR-2) stored as reflectance values (converted from raw integer DN via ×0.0001 scaling at export time). Includes WGS84 lon/lat and UTM x, y, and zone for spatial reference.When joining to the observation tables, use x, y, and zone as keys rather than lon/lat, to avoid floating point precision issues introduced during reprojection. Currently covers a subset of the full observation set and will be expanded to complete spatial and temporal coverage in future releases.