Hyperspectral vegetation indices for estimation of leaf area index

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Abstract

Spectral vegetation indices are frequently used to estimate vegetation biophysical/biochemical characteristics. In general they have been proposed to reduce spectral effects caused by external factors such as the atmosphere and the soil background. This study evaluated narrow band vegetation indices for estimation of vegetation leaf area index. The study takes advantage of using a dataset collected during a laboratory experiment. The spectral measurements have been carried out using a GER spectroradiometer. Leaf area indices were destructively acquired at the same time. Vegetation types sampled included four different types and sizes of leaves. For predicting leaf area index, five widely used vegetation indices were investigated. Narrow band vegetation indices involving all possible two band combinations of RVI, NDVI, PVI, TSAVI, and SAVI2 were computed. Cross-validation procedures were used to assess the predictive power of the regression model. We observed a significant relationship between the narrow band SAVI2 and the leaf area index (R2 =0.78, RMSE=0.57). All other narrow band indices respectively: RVI, NDVI, PVI and TSAVI had relatively lower R2 values (0.65≤ R2 ≤0.75) and higher RMSE values compared to SAVI2. Our results showed that bands from the SWIR region contain relevant information regarding to canopy LAI and are important for LAI estimation. The study demonstrates that hyperspectral data can be used to quantify leaf area index with a high accuracy.
Original languageEnglish
Title of host publicationISPRS 2006 : ISPRS mid-term symposium 2006 remote sensing : from pixels to processes, 8-11 May 2006, Enschede, the Netherlands. Enschede : ITC, 2006. 6 p.
EditorsNorman Kerle, Andrew Skidmore
Place of PublicationEnschede, The Netherlands
PublisherInternational Institute for Geo-Information Science and Earth Observation
Number of pages6
Volume36
Edition7
Publication statusPublished - 11 May 2006
EventISPRS Commission VII Symposium on 'Remote Sensing: From Pixels to Processes' 2006 - Enschede, Netherlands
Duration: 8 May 200611 May 2006
https://www.isprs.org/proceedings/XXXVI/part7/

Conference

ConferenceISPRS Commission VII Symposium on 'Remote Sensing: From Pixels to Processes' 2006
CountryNetherlands
CityEnschede
Period8/05/0611/05/06
Internet address

Keywords

  • NRS
  • ADLIB-ART-1334

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