Composite Site Productivity Index (CSPI) v2.0.0 for the conterminous United States: 30 m multi-metric composite

Version 2.0.0 of the Composite Site Productivity Index (CSPI) for the 48 conterminous United States at 30 m (EPSG:4326). Where v1.0.0 provided a single-metric Environmental Site Index, v2.0.0 delivers a true multi-metric composite. The headline product (CSPI_v2_5component_30m.tif) is the z-score weighted average of five independently fitted productivity layers, sigma-clipped at +/-3 and rescaled to 0-100: (1) Environmental Site Index (ESI v7), (2) Biomass Growth Increment from FIA remeasurement pairs, (3) asymptotic aboveground biomass (Chapman-Richards), (4) Miami-model NPP from PRISM climate, and (5) MOD17 satellite NPP. Both NPP formulations are retained as independent components because each captures a distinct productivity signal and prior analysis showed both perform well. Coverage correction: an earlier internal v2 composite used only the Miami NPP, which had been derived from a truncated climate input and was therefore empty over New England and the coastal Pacific Northwest. The climate inputs were regenerated from intact source data and MOD17 NPP was added as a second NPP component; this release has complete CONUS coverage including northern Maine, Oregon, and Washington. Forest-masked, 1 km aggregate, and composite-scale uncertainty layers accompany the headline composite, along with the ESI predicted-site-index products and the component input layers.