Validation of MODIS and GEOV1 fPAR Products in a Boreal Forest Site in Finland
Remote sensing of the fraction of absorbed Photosynthetically Active Radiation (fPAR) has become a timely option to monitor forest productivity. However, only a few studies have had ground reference fPAR datasets containing both forest canopy and understory fPAR from boreal forests for the validatio...
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| Format: | Article |
| Language: | English |
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MDPI AG
2015-01-01
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| Series: | Remote Sensing |
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| Online Access: | http://www.mdpi.com/2072-4292/7/2/1359 |
| _version_ | 1819290963276726272 |
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| author | Titta Majasalmi Miina Rautiainen Pauline Stenberg Terhikki Manninen |
| author_facet | Titta Majasalmi Miina Rautiainen Pauline Stenberg Terhikki Manninen |
| author_sort | Titta Majasalmi |
| collection | DOAJ |
| description | Remote sensing of the fraction of absorbed Photosynthetically Active Radiation (fPAR) has become a timely option to monitor forest productivity. However, only a few studies have had ground reference fPAR datasets containing both forest canopy and understory fPAR from boreal forests for the validation of satellite products. The aim of this paper was to assess the performance of two currently available satellite-based fPAR products: MODIS fPAR (MOD15A2, C5) and GEOV1 fPAR (g2_BIOPAR_FAPAR), as well as an NDVI-fPAR relationship applied to the MODIS surface reflectance product and a Landsat 8 image, in a boreal forest site in Finland. Our study area covered 16 km2 and field data were collected from 307 forest plots. For all plots, we obtained both forest canopy fPAR and understory fPAR. The ground reference total fPAR agreed better with GEOV1 fPAR than with MODIS fPAR, which showed much more temporal variation during the peak-season than GEOV1 fPAR. At the chosen intercomparison date in peak growing season, MODIS NDVI based fPAR estimates were similar to GEOV1 fPAR, and produced on average 0.01 fPAR units smaller fPAR estimates than ground reference total fPAR. MODIS fPAR and Landsat 8 NDVI based fPAR estimates were similar to forest canopy fPAR. |
| first_indexed | 2024-12-24T03:31:05Z |
| format | Article |
| id | doaj.art-38d9ff917893495fa71cf850fc6abf6f |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-12-24T03:31:05Z |
| publishDate | 2015-01-01 |
| publisher | MDPI AG |
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| series | Remote Sensing |
| spelling | doaj.art-38d9ff917893495fa71cf850fc6abf6f2022-12-21T17:17:12ZengMDPI AGRemote Sensing2072-42922015-01-01721359137910.3390/rs70201359rs70201359Validation of MODIS and GEOV1 fPAR Products in a Boreal Forest Site in FinlandTitta Majasalmi0Miina Rautiainen1Pauline Stenberg2Terhikki Manninen3Department of Forest Sciences, University of Helsinki, P.O. Box 27, FI-00014 Helsinki, FinlandDepartment of Forest Sciences, University of Helsinki, P.O. Box 27, FI-00014 Helsinki, FinlandDepartment of Forest Sciences, University of Helsinki, P.O. Box 27, FI-00014 Helsinki, FinlandFinnish Meteorological Institute, P.O. Box 503, FI-00101 Helsinki, FinlandRemote sensing of the fraction of absorbed Photosynthetically Active Radiation (fPAR) has become a timely option to monitor forest productivity. However, only a few studies have had ground reference fPAR datasets containing both forest canopy and understory fPAR from boreal forests for the validation of satellite products. The aim of this paper was to assess the performance of two currently available satellite-based fPAR products: MODIS fPAR (MOD15A2, C5) and GEOV1 fPAR (g2_BIOPAR_FAPAR), as well as an NDVI-fPAR relationship applied to the MODIS surface reflectance product and a Landsat 8 image, in a boreal forest site in Finland. Our study area covered 16 km2 and field data were collected from 307 forest plots. For all plots, we obtained both forest canopy fPAR and understory fPAR. The ground reference total fPAR agreed better with GEOV1 fPAR than with MODIS fPAR, which showed much more temporal variation during the peak-season than GEOV1 fPAR. At the chosen intercomparison date in peak growing season, MODIS NDVI based fPAR estimates were similar to GEOV1 fPAR, and produced on average 0.01 fPAR units smaller fPAR estimates than ground reference total fPAR. MODIS fPAR and Landsat 8 NDVI based fPAR estimates were similar to forest canopy fPAR.http://www.mdpi.com/2072-4292/7/2/1359canopy absorption modelLAI-2000TRAC |
| spellingShingle | Titta Majasalmi Miina Rautiainen Pauline Stenberg Terhikki Manninen Validation of MODIS and GEOV1 fPAR Products in a Boreal Forest Site in Finland Remote Sensing canopy absorption model LAI-2000 TRAC |
| title | Validation of MODIS and GEOV1 fPAR Products in a Boreal Forest Site in Finland |
| title_full | Validation of MODIS and GEOV1 fPAR Products in a Boreal Forest Site in Finland |
| title_fullStr | Validation of MODIS and GEOV1 fPAR Products in a Boreal Forest Site in Finland |
| title_full_unstemmed | Validation of MODIS and GEOV1 fPAR Products in a Boreal Forest Site in Finland |
| title_short | Validation of MODIS and GEOV1 fPAR Products in a Boreal Forest Site in Finland |
| title_sort | validation of modis and geov1 fpar products in a boreal forest site in finland |
| topic | canopy absorption model LAI-2000 TRAC |
| url | http://www.mdpi.com/2072-4292/7/2/1359 |
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