Biologic Markers of Air-Pollution Stress and Damage in Forests (1989) / Chapter Skim
Currently Skimming:
The Use of Remote Sensing for the Study of Air Pollution Effects in Forrests
The Use of Remote Sensing for the Study of Air Pollution Effects in Forrests
Pages 183-194
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From page 183... ...
Vogelmann Nancy J Defeo Institute for the Study of Earth, Oceans and Space Science and Engineering Research Building University of New Hampshire Durham, NH 03824 ABSTRACT Remote sensing techniques employing satellite and airborne multispectral data sets provide an accurate means of detecting, quantifying, mapping and monitoring damage in high elevation spruce/fir forests in the northeastern United States (US)
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From page 184... ...
Although images produced using this ratio are extremely accurate in mapping and quantifying forest damage levels, it is often difficult to ascertain what proportion of the damage detected is a result of a general forest decline phenomenon ("unnatural" damage) and what is attributed to "natural" conditions, such as those related to poor growing conditions, ice and wind storms, and other natural stresses.
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From page 185... ...
Numbered sad lettered area are study sites. Red grew indicate beavy forest damage.
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From page 186... ...
Areas that are blue to green showed either no major near-infrare~i reflectance changes, or increases in reflectance. Field and laboratory spectral ciata acquired for red spruce at the Camels Hump study area and for Norway spruce in West Germany suggest that a decrease in the near infrared reflectance accompanies an increase in needle damage associated with forest decline (S,9,10~.
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From page 187... ...
False color composite image from Multispectal Scanner (MSS) data of a portion of the Green Mountains of Vermont using 1973 0.65 and 0.95 Am bands, and the 0.95 ,um difference data set.
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From page 188... ...
At present, it is felt that the decrease in near-infrared reflectance noted in the 1984 data set as compared to the 1973 data set for the high-elevation coniferous regions is attributed to the general forest decline process, being related to the increased levels of mortality and decreased levels of green biomass that have been documented in this region. SPATIAL STUDIES The detection and quantification of spatial patterns of conifer forest damage in the eastern United States may be done accurately and objectively using remote sensing techniques.
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From page 189... ...
Table 1 is a summary of conifer damage for several high elevation areas in the Adirondack Mountains, Green Mountains and White Mountains. It should be made clear that these damage ratings are relative measures of forest health based on the field work done at Camels Hump.
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From page 190... ...
. FLUORESCENCE LINE IMAGER STUDIES To date, high-spectral resolution in situ and airborne sensor data sets have been acquired for forest decline sites in the northeastern United States (3,9)
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From page 191... ...
may provide information which allows separation of different damage types: forest decline damage in red spruce and winter damage/fir-wave damage in balsam fir. High-spectral resolution remote sensing systems currently available on airborne platforms will eventually be available on orbital platforms such as the NASA/ESA Earth Observing System (Eos)
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From page 192... ...
for high and low damage sites on Camels Hump, Vermont. In each, the solid curves are from low damage areas (site #1 in Fig.
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From page 193... ...
1986. Assmssing forest decline in coniferous forests of Vermont using NS-OO1 Thematic Mapper Simulator data.
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From page 194... ...
1987. Relationship of Thematic Mapper Simulator data to leaf area index of temperate coniferous forests.
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