AI Article Synopsis
- The leaf area index (LAI) of boreal forests can be effectively estimated using satellite sensors that capture reflected radiation, particularly in the middle infrared wavelengths.
- Research indicates that the newly derived vegetation index VI3 shows a stronger correlation with LAI compared to the commonly used normalized difference vegetation index (NDVI).
- Utilizing VI3, the study found that it accounted for about 76% of the variation in field estimates of LAI, while NDVI only accounted for 46%, highlighting the importance of middle infrared radiation in these estimates.
Article Abstract
The leaf area index (LAI) of boreal forest can be estimated using reflected radiation recorded by satellite sensors. Measurements of visible and near infrared radiation are commonly used in the normalized difference vegetation index (NDVI) to estimate LAI. However, research, mainly in tropical forest, has demonstrated that LAI is related more closely to radiation of middle infrared wavelengths than of visible wavelengths. This paper derives a vegetation index, VI3, based on radiation from vegetation recorded at near and middle infrared wavelengths. For a boreal forest canopy, the relationship between VI3 and LAI was observed to be much stronger than that between NDVI and LAI. In addition, the LAI estimated using VI3 accounted for about 76% of the variation in field estimates of LAI, compared with about 46% when using the NDVI. We conclude that information provided by middle infrared radiation should be considered when estimating the leaf area index of boreal forest.
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| http://dx.doi.org/10.1093/treephys/20.11.755 | DOI Listing |
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