Table 1.
Summary of biomass products used in this study
| Product | Sensor and year | Field data and year | Resolution | Forest mask | Approach | Uncertainty map | References |
|---|---|---|---|---|---|---|---|
| CMS_RF | DRL 2004–2012 |
2011–2014 | 30 m | NAIP high-res tree canopy cover | Random forest, regression tree | Percentile error (QRF) | [12, 18] |
| NBCD_NCE | Landsat + SRTM 2000 | 2000 | 30 m | NLCD 2001 | Random forest, regression tree | Quality voids | [13] |
| Blackard | MODIS 2001a |
2005–2009 | 250 m | NLCD 1992 | Cubist, regression tree | Relative error | [14] |
| Wilson | MODIS 2002–2008 |
2005–2009 | 250 m | NLCD 2001 percent tree canopy 25 % | PGNN, kNN | [15] | |
| Saatchi | MODIS + PALSAR + Landsat | 2005 | ~250 m v1b
~90 m v2b |
NLCD 2006 | MaxEntropy, parametric | Percent error | [16] |
aYear is national maps in eastern US.
bOriginal maps are in lat/lon, where v1 with 0.00222222 ≅ 250 m and v2 with 0.00083333 deg ≅ 90 m.
DRL Discrete Return Lidar, 1–2 m small footprint lidar aggregate, NAIP National Agriculture Imagery Program, QRF Quantile Regression Forests, SRTM Shuttle Radar Topography Mission, PALSAR Phased Array type L-band Synthetic Aperture Radar, PGNN Phenological Gradient Nearest Neighbor, kNN k-nearest neighbor.