Estimating forest leaf area index using satellite images : comparison of k-NN based Landsat-NFI LAI with MODIS-RSR based LAI product for Finland
Leaf area index (LAI) is a key variable for many ecological models, but it is typically not available from basic forest inventories. In this study, we (1) construct a high-resolution LAI map using k nearest-neighbor (k-NN) imputation based on National Forest Inventory data and Landsat 5 TM images (L...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/165218 2024-01-07T09:42:29+01:00 Estimating forest leaf area index using satellite images : comparison of k-NN based Landsat-NFI LAI with MODIS-RSR based LAI product for Finland Härkönen, Sanna Lehtonen, Aleksi Manninen, Terhikki Tuominen, Sakari Peltoniemi, Mikko Department of Forest Sciences 2016-08-04T09:11:01Z 15 application/pdf http://hdl.handle.net/10138/165218 eng eng Finnish Environment Institute This study was partially funded by the Carb-Bal project at Finnish Forest Research Institute (Academy of Finland, no. 128018) and the University of Helsinki (Academy of Finland, no. 128236) and partially by the CLIMFORISK (Climate change induced drought effects on forest growth and vulnerability) project (no. LIFE09 ENV/FI/000571). We thank the Finnish Forest Research Institute for providing the NFI data, and the Finnish Environment Institute for conducting atmospheric correction to the MODIS images. In addition, we are grateful to Dr. Ali Nadir Arslan from the Finnish Meteorological Institute and Dr. Kalle Eerikainen from the Finnish Forest Research Institute for their help and cooperation in the Carb-Bal project. In addition, Prof. Erkki Tomppo and For. Eng. Jouni Perasaari from the Finnish Forest Research Institute are acknowledged for pre-processing Landsat images for the major part of the study area. Härkönen , S , Lehtonen , A , Manninen , T , Tuominen , S & Peltoniemi , M 2015 , ' Estimating forest leaf area index using satellite images : comparison of k-NN based Landsat-NFI LAI with MODIS-RSR based LAI product for Finland ' , Boreal Environment Research , vol. 20 , no. 2 , pp. 181-195 . < http://www.borenv.net/BER/ber202.htm > 84927129868 a65dd026-43b5-42db-8e02-cd5664d8199f http://hdl.handle.net/10138/165218 000353934400004 other openAccess info:eu-repo/semantics/openAccess CLOUD-COVER ASSESSMENT SCOTS PINE LIGHT INTERCEPTION SHOOT STRUCTURE BOREAL FORESTS REFLECTANCE MODEL BIOMASS EQUATIONS NORWAY SPRUCE ABSORBED PAR SILVER BIRCH 4112 Forestry Article publishedVersion 2016 ftunivhelsihelda 2023-12-14T00:06:06Z Leaf area index (LAI) is a key variable for many ecological models, but it is typically not available from basic forest inventories. In this study, we (1) construct a high-resolution LAI map using k nearest-neighbor (k-NN) imputation based on National Forest Inventory data and Landsat 5 TM images (Landsat-NFI LAI), and (2) examine a moderate-resolution LAI map produced based on reduced simple ratio derived from MODIS reflectances (MODIS-RSR LM). The maps cover all the forested areas in Finland. Country-level averages of Landsat-NFI and MODIS-RSR LAI were at same level, but several geographical and land-use related differences between them were detected. Difference was the largest in the lake district of Finland and in northern Finland, and it increased with decreasing share of forests and increasing share of deciduous trees. As MODIS-RSR LAI does not take into account the sub-pixel variation in land use, Landsat-NFI LAI was found to produce more reliable estimates. Peer reviewed Article in Journal/Newspaper Boreal Environment Research Northern Finland HELDA – University of Helsinki Open Repository Norway |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
CLOUD-COVER ASSESSMENT SCOTS PINE LIGHT INTERCEPTION SHOOT STRUCTURE BOREAL FORESTS REFLECTANCE MODEL BIOMASS EQUATIONS NORWAY SPRUCE ABSORBED PAR SILVER BIRCH 4112 Forestry |
spellingShingle |
CLOUD-COVER ASSESSMENT SCOTS PINE LIGHT INTERCEPTION SHOOT STRUCTURE BOREAL FORESTS REFLECTANCE MODEL BIOMASS EQUATIONS NORWAY SPRUCE ABSORBED PAR SILVER BIRCH 4112 Forestry Härkönen, Sanna Lehtonen, Aleksi Manninen, Terhikki Tuominen, Sakari Peltoniemi, Mikko Estimating forest leaf area index using satellite images : comparison of k-NN based Landsat-NFI LAI with MODIS-RSR based LAI product for Finland |
topic_facet |
CLOUD-COVER ASSESSMENT SCOTS PINE LIGHT INTERCEPTION SHOOT STRUCTURE BOREAL FORESTS REFLECTANCE MODEL BIOMASS EQUATIONS NORWAY SPRUCE ABSORBED PAR SILVER BIRCH 4112 Forestry |
description |
Leaf area index (LAI) is a key variable for many ecological models, but it is typically not available from basic forest inventories. In this study, we (1) construct a high-resolution LAI map using k nearest-neighbor (k-NN) imputation based on National Forest Inventory data and Landsat 5 TM images (Landsat-NFI LAI), and (2) examine a moderate-resolution LAI map produced based on reduced simple ratio derived from MODIS reflectances (MODIS-RSR LM). The maps cover all the forested areas in Finland. Country-level averages of Landsat-NFI and MODIS-RSR LAI were at same level, but several geographical and land-use related differences between them were detected. Difference was the largest in the lake district of Finland and in northern Finland, and it increased with decreasing share of forests and increasing share of deciduous trees. As MODIS-RSR LAI does not take into account the sub-pixel variation in land use, Landsat-NFI LAI was found to produce more reliable estimates. Peer reviewed |
author2 |
Department of Forest Sciences |
format |
Article in Journal/Newspaper |
author |
Härkönen, Sanna Lehtonen, Aleksi Manninen, Terhikki Tuominen, Sakari Peltoniemi, Mikko |
author_facet |
Härkönen, Sanna Lehtonen, Aleksi Manninen, Terhikki Tuominen, Sakari Peltoniemi, Mikko |
author_sort |
Härkönen, Sanna |
title |
Estimating forest leaf area index using satellite images : comparison of k-NN based Landsat-NFI LAI with MODIS-RSR based LAI product for Finland |
title_short |
Estimating forest leaf area index using satellite images : comparison of k-NN based Landsat-NFI LAI with MODIS-RSR based LAI product for Finland |
title_full |
Estimating forest leaf area index using satellite images : comparison of k-NN based Landsat-NFI LAI with MODIS-RSR based LAI product for Finland |
title_fullStr |
Estimating forest leaf area index using satellite images : comparison of k-NN based Landsat-NFI LAI with MODIS-RSR based LAI product for Finland |
title_full_unstemmed |
Estimating forest leaf area index using satellite images : comparison of k-NN based Landsat-NFI LAI with MODIS-RSR based LAI product for Finland |
title_sort |
estimating forest leaf area index using satellite images : comparison of k-nn based landsat-nfi lai with modis-rsr based lai product for finland |
publisher |
Finnish Environment Institute |
publishDate |
2016 |
url |
http://hdl.handle.net/10138/165218 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Boreal Environment Research Northern Finland |
genre_facet |
Boreal Environment Research Northern Finland |
op_relation |
This study was partially funded by the Carb-Bal project at Finnish Forest Research Institute (Academy of Finland, no. 128018) and the University of Helsinki (Academy of Finland, no. 128236) and partially by the CLIMFORISK (Climate change induced drought effects on forest growth and vulnerability) project (no. LIFE09 ENV/FI/000571). We thank the Finnish Forest Research Institute for providing the NFI data, and the Finnish Environment Institute for conducting atmospheric correction to the MODIS images. In addition, we are grateful to Dr. Ali Nadir Arslan from the Finnish Meteorological Institute and Dr. Kalle Eerikainen from the Finnish Forest Research Institute for their help and cooperation in the Carb-Bal project. In addition, Prof. Erkki Tomppo and For. Eng. Jouni Perasaari from the Finnish Forest Research Institute are acknowledged for pre-processing Landsat images for the major part of the study area. Härkönen , S , Lehtonen , A , Manninen , T , Tuominen , S & Peltoniemi , M 2015 , ' Estimating forest leaf area index using satellite images : comparison of k-NN based Landsat-NFI LAI with MODIS-RSR based LAI product for Finland ' , Boreal Environment Research , vol. 20 , no. 2 , pp. 181-195 . < http://www.borenv.net/BER/ber202.htm > 84927129868 a65dd026-43b5-42db-8e02-cd5664d8199f http://hdl.handle.net/10138/165218 000353934400004 |
op_rights |
other openAccess info:eu-repo/semantics/openAccess |
_version_ |
1787423468704235520 |