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Applicability of leaf area index products for boreal regions of Sweden

Tagesson, Torbern LU ; Eklundh, Lars LU and Lindroth, Anders LU (2009) In International Journal of Remote Sensing 30(21). p.5619-5632
Abstract
Leaf area index (LAI) of boreal ecosystems were estimated with optical instruments at the Laxemar and the Forsmark investigation areas in Sweden. The aim was to study the relationship between LAI and the normalized difference vegetation index (NDVI) from Landsat-5 and SPOT and evaluate the applicability of the MODIS (Moderate Resolution Imaging Spectroradiometer) LAI product for small boreal regions. Relationships between ground-estimated LAI and NDVI were significant for coniferous, deciduous and mixed forest sites in Laxemar. For Forsmark, effective LAI was correlated to NDVI for all sites. LAI estimated from NDVI was also used for evaluating accuracy of the MODIS LAI product. The comparison showed no correlation between MODIS LAI and... (More)
Leaf area index (LAI) of boreal ecosystems were estimated with optical instruments at the Laxemar and the Forsmark investigation areas in Sweden. The aim was to study the relationship between LAI and the normalized difference vegetation index (NDVI) from Landsat-5 and SPOT and evaluate the applicability of the MODIS (Moderate Resolution Imaging Spectroradiometer) LAI product for small boreal regions. Relationships between ground-estimated LAI and NDVI were significant for coniferous, deciduous and mixed forest sites in Laxemar. For Forsmark, effective LAI was correlated to NDVI for all sites. LAI estimated from NDVI was also used for evaluating accuracy of the MODIS LAI product. The comparison showed no correlation between MODIS LAI and NDVI-based LAI in Forsmark whereas there was in Laxemar. MODIS LAI was on average 2.28 higher than NDVI-based LAI and it also showed larger scatter. Scale issues were the main explanation to high MODIS LAI, since the heterogeneous landscapes with open areas (given a value of zero in the NDVI estimates) was seen as forest in the large pixels of the MODIS LAI product. Therefore, we do not recommend using the MODIS LAI product in small boreal regional landscapes, such as the Forsmark and Laxemar investigation areas. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
remote sensing, SPOT, leaf area index, MODIS
in
International Journal of Remote Sensing
volume
30
issue
21
pages
5619 - 5632
publisher
Taylor & Francis
external identifiers
  • wos:000271449100007
  • scopus:70449380010
ISSN
1366-5901
DOI
10.1080/01431160802695709
language
English
LU publication?
yes
id
e21fdfde-dffb-48ff-83dc-692ebc6a129b (old id 1260585)
date added to LUP
2009-04-06 11:46:17
date last changed
2017-12-10 03:48:32
@article{e21fdfde-dffb-48ff-83dc-692ebc6a129b,
  abstract     = {Leaf area index (LAI) of boreal ecosystems were estimated with optical instruments at the Laxemar and the Forsmark investigation areas in Sweden. The aim was to study the relationship between LAI and the normalized difference vegetation index (NDVI) from Landsat-5 and SPOT and evaluate the applicability of the MODIS (Moderate Resolution Imaging Spectroradiometer) LAI product for small boreal regions. Relationships between ground-estimated LAI and NDVI were significant for coniferous, deciduous and mixed forest sites in Laxemar. For Forsmark, effective LAI was correlated to NDVI for all sites. LAI estimated from NDVI was also used for evaluating accuracy of the MODIS LAI product. The comparison showed no correlation between MODIS LAI and NDVI-based LAI in Forsmark whereas there was in Laxemar. MODIS LAI was on average 2.28 higher than NDVI-based LAI and it also showed larger scatter. Scale issues were the main explanation to high MODIS LAI, since the heterogeneous landscapes with open areas (given a value of zero in the NDVI estimates) was seen as forest in the large pixels of the MODIS LAI product. Therefore, we do not recommend using the MODIS LAI product in small boreal regional landscapes, such as the Forsmark and Laxemar investigation areas.},
  author       = {Tagesson, Torbern and Eklundh, Lars and Lindroth, Anders},
  issn         = {1366-5901},
  keyword      = {remote sensing,SPOT,leaf area index,MODIS},
  language     = {eng},
  number       = {21},
  pages        = {5619--5632},
  publisher    = {Taylor & Francis},
  series       = {International Journal of Remote Sensing},
  title        = {Applicability of leaf area index products for boreal regions of Sweden},
  url          = {http://dx.doi.org/10.1080/01431160802695709},
  volume       = {30},
  year         = {2009},
}