L3A - Summary of Airborne LiDAR transects collected by EBA in the Brazilian Amazon

The shapefile provides the exact location and the attributes of the LiDAR transects including sampling method, sampling criteria, if the field data is available, who is the field data owner, the average metrics, and other relevant information. The metrics were extracted from the original point cloud, including basic outlier cleaning. The EBA project collects the LiDAR transects between 2016 and 2018. Each transect covered 375 ha (12.5 km × 300 m) by emitting full-waveform laser pulses from a Trimble Harrier 68i airborne sensor (Trimble; Sunnyvale, CA) aboard a Cessna aircraft (model 206). The average point density was set at four returns per square meters, the field of view was equal to 30°, the flying altitude was 600 m, and transect width on the ground was approximately 494 m. Global Navigation Satellite System (GNSS) data were collected on a dual-frequency receiver (L1/L2). The pulse footprint was set to be below 30 cm, based on a divergence angle between 0.1 and 0.3 milliradians. Horizontal and vertical accuracy were controlled to be under 1 m and under 0.5 m, respectively.

Metadata included in the shapefile:

1. Transect = Transect id (unique identification).
2. Field_data = researcher or project who own the field data.
3. Hyperspect = presence of hyperspectral data.
4. Obs = Contact person that requested the transect.
5. Campaign = 1 between 2016 and 2017. 2 between 2017 and 2018.
6. Criteria = Study criteria to orient allocation.
7. Datafile = name of datafile.
8. Elev_maxim = maximum height meters.
9. Elev_mean = mean height in meters.
10. Elev_mode = Height mode in meters.
11. Elev_stdde = Height standard deviation in meters.
12. Elev_varia = Height variance.
13. Elev_cv = Coefficient of variation for height.
14. Elev_iq = 75th percentile minus 25th percentile for height in meters.
15. Elev_skewn = Skewness for height.
16. Elev_kurto = Kurtosis for height.
17. Elev_aad = Height average absolute deviation in meters.
18. Elev_mad_m = Mean absolute deviation for height in meters.
19. Elev_mad_1 = not clear yet.
20. Elev_l1 = L-moment 1 distance for height
21. Elev_l2 = L-moment 2 distance for height
22. Elev_l3 = L-moment 3 distance for height
23. Elev_l4 = L-moment 4 distance for height
24. Elev_l_cv = Coefficient of variation for L-moment .
25. Elev_l_ske = Skewness for L-moment.
26. Elev_l_kur = Kurtorsis for L-moment.
27. Elev_p05 = Percentile 5 for height in meters.
28. Elev_p20 = Percentile 20 for height in meters.
29. Elev_p25 = Percentile 25 for height in meters.
30. Elev_p30 = Percentile 30 for height in meters.
31. Elev_p40 = Percentile 40 for height in meters.
32. Elev_p50 = Percentile 50 for height in meters.
33. Elev_p60 = Percentile 60 for height in meters.
34. Elev_p70 = Percentile 70 for height in meters.
35. Elev_p75 = Percentile 75 for height in meters.
36. Elev_p80 = Percentile 80 for height in meters.
37. Elev_p90 = Percentile 90 for height in meters.
38. Elev_p95 = Percentile 95 for height in meters.
39. Elev_p99 = Percentile 99 for height in meters.
40. Canopy_rel = not clear yet.
41. Elev_sqrt = Quadratic mean for hieght
42. Elev_curt = Cubic mean for height
43. Profile_ar = not clear yet.
44. Random = Yes, if transect was random selected inside the criteria.
45. Epsg = Coordinate system.
46. eba_map = transects included in the biomass map for 4th National Communication
47. overlap = transects overlapping more than 45%.