Journal
GEOCARTO INTERNATIONAL
Volume 36, Issue 18, Pages 2044-2064Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/10106049.2019.1687591
Keywords
Crop; PROSAIL; inversion; spatial resolution; spectral resolution
Categories
Funding
- ICAR-National Innovations on Climate Resilient Agriculture (NICRA) project
- IARI in-house project [CRSCIARISIL2014028260]
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Atmospheric correction using MODTRAN significantly improves LAI retrieval with Sentinel-2 MSI imagery, while lookup table inversion outperforms artificial neural network.
This study assessed the effect of atmospheric correction algorithms, inversion techniques and image spatial and spectral resolution on wheat crop LAI retrieval using Sentinel-2 MSI and Landsat-8 OLI imagery. The LAI retrievals were validated with in-situ measurements collected in farmers' fields. The MSI-based LAI retrievals improved significantly when images were atmospherically corrected using MODTRAN than using the libRadtran code. Among the two PROSAIL inversion approaches, look-up table outperforms artificial neural network for LAI retrievals. Using the best strategy of atmospheric correction and inversion, the effect of spatial resolution from 20 m (MSI) to 30 m (OLI) while using common six bands, showed non-significant improvement in LAI retrievals. The inclusion of additional two red-edge bands as available in MSI significantly reduced the uncertainly in LAI retrievals over that obtained by using six bands, while inclusion of only additional VNIR band did not show any significant effect on LAI retrievals.
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