Table 1. Details of airborne lidar data collections.
| Data Characteristics | Initial Collection | Final Collection | ||
|---|---|---|---|---|
| Tapajos | Ducke Res. | Tapajos | Ducke Res. | |
| Lidar System | Leica ALS50-II | Leica ALS50-II | ALTM 3100EA | ALTM 3100EA |
| Flight Altitude | 700–900 m | 700–900 m | 600 m | 600 m |
| Divergence | 15 mrad | 15 mrad | 25 mrad | 25 mrad |
| Footprint Size at nadir | 10 cm | 10 cm | 15 cm | 15 cm |
| Pulse Frequency | 118 kHz | 118 kHz | 50 kHz | 50 kHz |
| Acquisition Date | 06-07/2008 | 06-07/2008 | 08/2012 | 02/2012 |
| Minimum return density (m-2) | 10 | 10 | 4 | 4 |
| Ground return density (m-2) | 0.44 | 0.83 | 0.49 | 0.19 |