BACKGROUND Estimates of live-tree carbon stores are influenced by numerous uncertainties. One of them is model-selection uncertainty: one has to choose among multiple empirical equations and conversion factors that can be plausibly justified as locally applicable to calculate the carbon store from inventory measurements such as tree height and diameter at breast height (DBH). Here we quantify t...

The objectives of this study are to: (1) evaluate accuracy of tree height measurements of manual stereo viewing on a computer display using digital aerial photographs compared with airborne LiDAR height measurements; and (2) develop an empirical model to estimate stand-level aboveground biomass with variables derived from manual stereo viewing on the computer display in a Cambodian tropical sea...

Quercus mongolica secondary forest is widely distributed in the northeast of China, but it usually has low productivity, unstable structure, poor health, and biodiversity. Diameter a tree variable that commonly used for growth measurement, to provide basis management decision. Two level generalized linear mixed effects individual diameter model were developed using data from two times surveys 1...

The height of scattering phase center retrieved from InSAR data is considered to be correlated with tree height and the spatial structure of the forest stand. Though some researchers have used simple backscattering models to estimate tree height from the height of scattering center, the effect of forest spatial structure on InSAR data is not well understood yet. A three-dimensional coherent rad...

Individual tree species classification can be done using Light Detection and Ranging (LIDAR) and aerial multichannel images simultaneously. LIDAR is typically used to derive shape features and aerial images are employed to extract colour features from a dataset. Different lighting conditions are a common problem when images are utilised: the position of the sun has a significant impact on the b...

We consider the problem of finding equivalent reorderings of a sparse matrix so that the reordered matrix is suitable for parallel Ganssian elimination. The elimination tree structure is used as our parallel model. We show that the reordering scheme by Jess and Kees generates an elimination tree with minimum height among all such trees from the class of equivalent reorderings. A new height-redu...