@InProceedings{RosaNVAASSL:2017:FoStGr,
author = "Rosa, Diogo Martins and Nelson, Bruce Walker and Valle, Dalton
Freitas do and Almeida, Juliana Schietti de and Almeida, Danilo
Roberti Alves de and Stark, Scott Christopher and Saleska, Scott
Reid and Lefsky, Michael",
title = "Forest structure gradient along a Central Amazon catena revealed
by ground LiDAR",
booktitle = "Anais...",
year = "2017",
editor = "Gherardi, Douglas Francisco Marcolino and Arag{\~a}o, Luiz
Eduardo Oliveira e Cruz de",
pages = "2301--2306",
organization = "Simp{\'o}sio Brasileiro de Sensoriamento Remoto, 18. (SBSR)",
publisher = "Instituto Nacional de Pesquisas Espaciais (INPE)",
address = "S{\~a}o Jos{\'e} dos Campos",
abstract = "We used an upward-looking rangefinder-type ground LiDAR to
describe differences in structure between Central Amazon terra
firme forest types along a topographic/soil gradient. The LiDAR
recorded 1000 last-return distances from the ground per second. At
a constant walking speed, we sampled six 150m transects per forest
type. All were located in the footprint of the LBA micromet tower
near Manaus. For each forest type along the gradient we produced
(1) a vertical profile of leaf area density (LAD); (2) a frequency
histogram of top-of-canopy (TOC) heights at 1m horizontal scale;
and (3) a variogram of these fine-scale TOC heights. LAD profiles
and TOC histograms show that topography imposes a gradient in
canopy height and in the variance of this height. Low-lying
riparian and campinarana forests on white sand have a lower and
more homogenous canopy surface. Upper slope and plateau forests on
well-drained clay and loam have a taller and more irregular canopy
surface. Differences between the two topographic extremes were
confirmed using a Canopy Height Model from airborne LiDAR.
Autocorrelation of ground LiDAR TOC heights reached 40-100m
horizontal distance in upper slope and plateau forests, but
extended to less than 20m in the sandy lower slope and riparian
forests. The long reach of spatial autocorrelation on upper slopes
and plateaus may result from (1) a matrix of lower crowns between
scattered emergents, (2) larger gaps caused by fallen emergents,
and (3) broad crowns of live emergents.",
conference-location = "Santos",
conference-year = "28-31 maio 2017",
isbn = "978-85-17-00088-1",
label = "59809",
language = "en",
organisation = "Instituto Nacional de Pesquisas Espaciais (INPE)",
ibi = "8JMKD3MGP6W34M/3PSLQBJ",
url = "http://urlib.net/ibi/8JMKD3MGP6W34M/3PSLQBJ",
targetfile = "59809.pdf",
type = "LIDAR: sensores e aplica{\c{c}}{\~o}es",
urlaccessdate = "16 jun. 2024"
}