Qing Xu

Qing Xu
International Centre for Bamboo and Rattan

PhD

About

21
Publications
2,858
Reads
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287
Citations
Introduction
(Remote Sensing - Assisted) Forest Inventory and Analysis
Additional affiliations
January 2015 - present
University of Illinois, Urbana-Champaign
Position
  • PostDoc Position
January 2015 - January 2016
University of Illinois, Urbana-Champaign
Position
  • PostDoc Position
March 2014 - April 2014
Univerisity of Eastern Finland
Position
  • Exercise course teacher in Advanced GIS

Publications

Publications (21)
Article
Full-text available
There are two distinct types of domains, design- and cross-classes domains, with the former extensively studied under the topic of small-area estimation. In natural resource inventory, however, most classes listed in the condition tables of national inventory programs are characterized as cross-classes domains, such as vegetation type, productivity...
Article
The planning of wood procurement requires reliable information about the species-specific timber assortments on which the economic value of a production forest depends. The timber assortments refer to the stem volumes of the sawlog and pulpwood fractions, specified in terms of both timber quality and allowable log dimensions, e.g., the stem diamete...
Article
We aim to improve the predictive mapping of stem volume with airborne laser scanning (ALS) data acquired in Laos by adapting the area-based approach (ABA) to a tropical context. Separating laser returns of bushes from main stories with a cutoff threshold is a step very important to the ABA. The adaptation focused here on applying global and plot-ad...
Article
Full-text available
Due to an oversight by the authors there is a correction necessary in this publication [1]. We would like to change the word “phase” to “step” throughout the manuscript. We apologize for any inconvenience caused to readers.[...]
Article
We aimed to investigate how the spatial pattern of a forest attribute is connected with design-based sampling efficacy in relation to the selection of plot size and quantity, expressed together by the cruise percent (CP). Spatially random or aggregated patterns of stem volume (m3/ha) with various hierarchical strengths were generated as model plant...
Article
Full-text available
The individual tree detection (ITD) using airborne laser scanning (ALS) data suffers from the problem of underestimating forest total attributes, caused by deficient detectability of suppressed trees. A new method is proposed in this study to retrieve height information for suppressed trees in order to improve the estimation of forest total stem vo...
Article
Diameter distribution is essential for calculating stem volume and timber assortments of forest stands. A new method was proposed in this study to improve the estimation of stem volume and timber assortments, by means of combining the Area-based approach (ABA) and individual tree detection (ITD), the two main approaches to deriving forest attribute...
Article
Full-text available
This study evaluated the accuracy of boreal forest above-ground biomass (AGB) and volume estimates obtained using airborne laser scanning (ALS) and RapidEye data in a two-phase sampling method. Linear regression-based estimation was employed using an independent validation dataset and the performance was evaluated by assessing the bias and the root...
Conference Paper
Remarkably relevant to the global greenhouse gas emissions, tropical forests are of substantial meaning in battle against the climate change. In line with the Three-Tier accuracies of carbon inventory proposed by the International Panel on Climate Change, airborne laser scanning (ALS) has shown potential in favoring tropical forest mapping with top...
Article
As a spatial source of forest data, the forest stand is the basic unit for forest management and planning. Computerized segmentation of a diverse range of remote sensing material has been studied for delineating stands in various forest types, but is relatively rare under tropical conditions. In line with REDD+, which advocates sustainable forest m...
Article
Relative radiometric correction methods have been widely used to correct ground illumination difference in multi-temporal satellite data. ALOS (Advanced Land Observing Satellite) data starts to play an important role in forest and carbon assessment, such as the REDD (Reducing Emissions from Deforestation and forest Degradation) program. The objecti...
Article
In this study, the potential of remote sensing in tropical forests is examined in relation to the diversification of sensors. We report here on the comparison of alternative methods that use multisource data from Airborne Laser Scanning (ALS), Airborne CIR and ALOS AVNIR-2 to estimate stem volume and basal area, in Laos. Multivariate linear regress...

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