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Journal of Applied Remote Sensing • Open Access

Estimating the age of deciduous forests in northeast China with Enhanced Thematic Mapper Plus data acquired in different phenological seasons
Author(s): Dengqiu Li; Weimin Ju; Wenyi Fan; Zhujun Gu

Paper Abstract

This study investigated the ability of Landsat Enhanced Thematic Mapper Plus data acquired in leaf-on and leaf-off seasons to estimate stand age of Larix gmelinii and Betula platyphylla in northeast China. The relationships of six band reflectances, nine vegetation indices, and six texture measures with stand age were examined. Linear and multivariable regression models and multilayer perceptron neural network (MLP NN) were employed to estimate forest age based on these variables. The results indicate that reflectance in short-wave infrared bands and wetness are more significantly correlated with stand age in the leaf-on image, while reflectance in blue and green bands and greenness are more sensitive to stand age in leaf-off image. The MLP NN model can be effectively used to retrieve the stand age; the highest coefficient of determination and minimum root mean square error values of retrieved age are 0.47 and 21.3 years for Larix gmelinii, and 0.60 and 10.1 years for Betula platyphylla, respectively. The predicted age errors increased significantly when stand ages were <100 and <50 years for Larix gmelinii and Betula platyphylla, respectively. Remote sensing data acquired in the leaf-on season is more suitable for estimating forest age than that acquired in the leaf-off season over the study area.

Paper Details

Date Published: 6 March 2014
PDF: 21 pages
J. Appl. Remote Sens. 8(1) 083670 doi: 10.1117/1.JRS.8.083670
Published in: Journal of Applied Remote Sensing Volume 8, Issue 1
Show Author Affiliations
Dengqiu Li, Nanjing Univ. (China)
Weimin Ju, Nanjing Univ. (China)
Wenyi Fan, Northeast Forestry Univ. (China)
Zhujun Gu, Nanjing Xiaozhuang Univ. (China)

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