Table 1 Influence of varying forest structure on the AGV-backscatter curve in simulated forests.
From: Understanding ‘saturation’ of radar signals over forests
Structural property | Simulated ranges (D: Denmark LR: La Rioja) | Predicted AGV range | Slope of predicted AGV-\({{\boldsymbol{\sigma }}}_{{\bf{HV}}}^{{\bf{0}}}\) curve (range or constant) | Slope of predicted AGV-\({{\boldsymbol{\sigma }}}_{{\bf{HH}}}^{{\bf{0}}}\) curve (range or constant) |
|---|---|---|---|---|
Mean stem size (i.e. mean diameter at breast height) | D: 0.01–0.1 m | 28–120 m3/ha | 0.087–0.014 dB ha/m3 | 0.044–0.007 dB ha/m3 |
D: 0.15–0.33 m | 230–418 m3/ha | 0.006–0.003 dB ha/m3 | 0.006–0.003 dB ha/m3 | |
LR: 0.08–0.19 m | 28–214 m3/ha | 0.021–0.009 dB ha/m3 | 0.020–0.009 dB ha/m3 | |
LR: 0.23–0.33 m | 325–634 m3/ha | 0.003–0.002 dB ha/m3 | 0.003–0.002 dB ha/m3 | |
Stem number density (/ha) | D: 50–5000 stems | 31–81 m3/ha | 0.039 dB ha/m3 | 0.008 dB ha/m3 |
D: 35–800 stems | 160–467 m3/ha | 0.002 dB ha/m3 | 0.001 dB ha/m3 | |
LR: 132–2400 stems | 17–212 m3/ha | 0.009 dB ha/m3 | 0.006 dB ha/m3 | |
LR: 560–1100 stems | 309–596 m3/ha | 0.001 dB ha/m3 | 0.001 dB ha/m3 | |
Mean stem height | D: 1.5–8.7 m | 0.5–132 m3/ha | 0.001 dB ha/m3 | −0.003 dB ha/m3 |
D: 10–21 m | 176–458 m3/ha | −0.002 dB ha/m3 | −0.005 dB ha/m3 | |
LR: 1–14 m | 52–170 m3/ha | 0.002 dB ha/m3 | ~0.000 dB ha/m3 | |
LR: 10–21 m | 336–524 m3/ha | −0.001 dB ha/m3 | −0.004 dB ha/m3 |
