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.
| Translated title of the contribution | Spectral interpretation of changes in forest using satellite scanner images |
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| Original language | Finnish |
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| Number of pages | 111 |
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| Publication status | Published - 1991 |
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| MoE publication type | C1 Separate scientific books |
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| Series | Acta forestalia Fennica |
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| Volume | 222 |
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| ISSN | 0001-5636 |
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