Table 1 Sources of disagreement among the four national AGB maps
AGB maps | Forest mask | Grain size (m) | Spatial predictors | Extrapolation technique (parametric/non-parametric) | Year of generation of map | Allometric equation |
|---|---|---|---|---|---|---|
Saatchi et al. [16] (S) | NLCD 2006 | 93 | F(MODIS, Landsat, L-band PALSAR, GLAS, topography) | Maximum Entropy (Parametric) | 2005 | Component ratio method |
Kellndorfer et al. [17] (K) | NLCD 2001 | 30 | F(C-band InSAR, Landsat, NLCD canopy density, structure, SRTM) | Regression tree (Random forest, Non-parametric) | 2000 | Regional method |
Blackard et al. [18] (B) | In house | 250 | F(MODIS, climate variables variables, topography) | Regression tree (Cubist, Non-parametric) | 2003 | Regional method |
Wilson et al. [19] (W) | No Forest mask | 250 | F(MODIS, climate variables, topography, level III ecoregions) | Phenological gradient nearest neighborhood (Semi-parametric/Semi-nonparametric) | 2009 | Component ratio method |