Spectral interpretation of changes in forest using satellite scanner images.

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Acta Forestalia Fennica. 1991.222: 1-111.

Title: Spectral interpretation of changes in forest using satellite scanner images.
Alternative title: Metsän muutosten spektrinen tulkinta satelliittikeilainkuvien avulla.
Author: Häme, Tuomas
Publisher: The Society of Forestry in Finland - The Finnish Forest Research Institute
Date: 1991
Language: en
ISSN: 0001-5636
URI: http://hdl.handle.net/1975/9323
Abstract: A study was made of the spectral characteristics of sudden changes occurring in a 40x40 km forest in S. Finland in 1984-87 using satellite scanner images (Landsat Thematic Mapper and Spot images and spectroradiometer measurements). Scots pine (Pinus sylvestris) and Norway spruce (Picea abies) were the most common tree species. The changes were (1) clear felling, (2) selective thinning, (3) site preparation on clear felled areas, (4) weeding of deciduous shrubs and/or thinning of conifer seedling regeneration, (5) damage caused by the fungus Gremmeniella abietina and (6) deciduous shrub growth in regeneration areas. A computer model of spectral characteristics was developed and compared with the empirical data. G. abietina damage increased the reflectance in the visible part of the light spectrum and decreased the reflectance in the rear infrared part. Near infrared reflectance was reduced after thinning. A system for automated monitoring of changes is presented.
Subject: damage, photointerpretation, remote sensing, satellites, stand characteristics, vegetation

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