Ground-based canopy transmittance and satellite remotely sensed measurements for estimation of coniferous forest canopy structure

Ground-based measurements of forest canopy transmittance provide a ready means of estimating intercepted photosynthetically active radiation (IPAR) for use in calibrating satellite remotely sensed estimates of forest canopy structure. The relationship between canopy transmittance and Landsat Themati...

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Bibliographic Details
Published in:Remote sensing of environment 1991-06, Vol.36 (3), p.179-188
Main Authors: Lathrop, Richard G., Pierce, Lars L.
Format: Article
Language:English
Subjects:
BOSQUE DE CONIFERAS
CANOPY
CONIFEROUS FORESTS
COUVERT
CUBIERTA DE COPAS
Earth Resources And Remote Sensing
ENERGIA SOLAR
ENERGIE SOLAIRE
FORET RESINEUSE
FOTOSINTESIS
INTERCEPTION
LARIX OCCIDENTALIS
LEAF AREA
LEAF AREA INDEX
MEASUREMENT
MEDICION
MESURE
MONTANA
OPTICAL PROPERTIES
PHOTOSYNTHESE
PHOTOSYNTHESIS
PHOTOSYNTHETICALLY ACTIVE RADIATION
PINUS CONTORTA
PINUS PONDEROSA
PROPIEDADES OPTICAS
PROPRIETE OPTIQUE
PSEUDOTSUGA MENZIESII
REMOTE SENSING
SOLAR ENERGY
SUPERFICIE FOLIAR
SURFACE FOLIAIRE
TELEDETECCION
TELEDETECTION
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Summary:Ground-based measurements of forest canopy transmittance provide a ready means of estimating intercepted photosynthetically active radiation (IPAR) for use in calibrating satellite remotely sensed estimates of forest canopy structure. The relationship between canopy transmittance and Landsat Thematic Mapper (TM) near IR/red radiance ratio data was examined for a temperature coniferous forest study site in northwestern Montana. Semivariogram analysis showed that the canopy transmittance and the TM near IR/red ratio had a similar spatial autocorrelation structure. Due to the fine scale patchiness of the forest canopy, the canopy transmittance and TM data were averaged at the coarser scale of the hillslope terrain units for regression analysis. These hillslope averaged data sets showed a strong linear relationship ( R 2 = 0.66). The transmittance measurements were converted to leaf area index (LAI) but comparison with previous results obtained for coniferous forests in Oregon (Peterson et al., 1987) shows some differences in the relationship between LAI and TM near IR/red ratio.
ISSN:0034-4257
1879-0704
DOI:10.1016/0034-4257(91)90055-B