University of Twente Student Theses
Validation of the Leaf Area Index product from MODIS-15 for Rice using a Soil-Leaf-Canopy Radiative Transfer Model: A case study of Seville, Spain
Suarez Urrutia, Jose Alfredo (2010) Validation of the Leaf Area Index product from MODIS-15 for Rice using a Soil-Leaf-Canopy Radiative Transfer Model: A case study of Seville, Spain.
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| Abstract: | The performance of the MODIS LAI/FPAR 8-day composite product and a physically based radiative transfer model called Soil-Leaf-Canopy (SLC) were compared to identify which was capable to perform a better estimation of LAI compared to in situ measurements. The study was carried out in the zone of rice production of Seville, Spain. The performances of the MODIS product and SLC model were assessed against LAI values collected in the field using LAI-2000 during July and August of 2008. MODIS LAI/FPAR coarse resolution product (MOD15A2) was compared against in situ measurements using a disaggregation technique to estimate the fraction cover of vegetation based on NDVI retrievals from LANDSAT 7 ETM+ products. LAI from SLC was estimated by means of the model inversion with the aid of a look-up table and a iterative method of inversion (LUT). Forward modelling of the spectral reflectances was carried out prior to the inversion, using MODIS spectral reflectance product (MOD09A1) to adjust the outputs of the LUT. Estimated LAI was compared against in situ measurements to evaluate the performance of the inversion from SLC. MODIS LAI/FPAR values showed a Pearson’s correlation coefficient (R) of 0.44 against in situ measurements. Estimated LAI from SLC showed a Pearson’s correlation coefficient of 0.50. Improvements of 10% of the estimations were observed in SLC’s values compared to MODIS LAI/FPAR values. The study concludes that despite of the complex parameters required by the model, SLC’s performance is better for the prediction of LAI for rice than the MODIS LAI/FPAR product. It was also observed that improvements in the method of inversion can considerable enhance the performance of SLC. Keywords: Leaf area index (LAI), MODIS LAI/FPAR, Soil-leaf-canopy (SLC), Radiative transfer model (RTM). |
| Item Type: | Essay (Master) |
| Faculty: | ITC: Faculty of Geo-information Science and Earth Observation |
| Programme: | Geoinformation Science and Earth Observation MSc (75014) |
| Link to this item: | https://purl.utwente.nl/essays/92483 |
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