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Title: Evaluation of the Uncertainty in Satellite-Based Crop State Variable Retrievals Due to Site and Growth Stage Specific Factors and Their Potential in Coupling with Crop Growth Models

Journal Article · · Remote Sensing
DOI:https://doi.org/10.3390/rs11161928· OSTI ID:1628529
 [1]; ORCiD logo [2];  [3]; ORCiD logo [4];  [5];  [6];  [6]
  1. City College of New York, NY (United States). Dept. of Electrical Engineering
  2. Univ. of Wisconsin, Madison, WI (United States). Dept. of Geography; Univ. of Wisconsin, Madison, WI (United States). Nelson Institute Center for Sustainability and the Global Environment
  3. Univ. of Wisconsin, Madison, WI (United States). Nelson Institute Center for Sustainability and the Global Environment; Univ. of Wisconsin, Madison, WI (United States). Dept. of Forest and Wildlife Ecology
  4. CNR-Institute of Mediterranean Forest and Agricultural Systems, Napoli (Italy)
  5. Farmingdale State College, Farmingdale, NY (United States). Dept. of Electrical and Computer Engineering Technology
  6. City College of New York, NY (United States). Dept. of Electrical Engineering

Coupling crop growth models and remote sensing provides the potential to improve our understanding of the genotype x environment x management (G × E × M) variability of crop growth on a global scale. Unfortunately, the uncertainty in the relationship between the satellite measurements and the crop state variables across different sites and growth stages makes it difficult to perform the coupling. In this study, we evaluate the effects of this uncertainty with MODIS data at the Mead, Nebraska Ameriflux sites (US-Ne1, US-Ne2, and US-Ne3) and accurate, collocated Hybrid-Maize (HM) simulations of leaf area index (LAI) and canopy light use efficiency (LUECanopy). The simulations are used to both explore the sensitivity of the satellite-estimated genotype × management (G × M) parameters to the satellite retrieval regression coefficients and to quantify the amount of uncertainty attributable to site and growth stage specific factors. Additional ground-truth datasets of LAI and LUECanopy are used to validate the analysis. The results show that uncertainty in the LAI/satellite measurement regression coefficients lead to large uncertainty in the G × M parameters retrievable from satellites. In addition to traditional leave-one-site-out regression analysis, the regression coefficient uncertainty is assessed by evaluating the retrieval performance of the temporal change in LAI and LUECanopy. The weekly change in LAI is shown to be retrievable with a correlation coefficient absolute value (|r|) of 0.70 and root-mean square error (RMSE) value of 0.4, which is significantly better than the performance expected if the uncertainty was caused by random error rather than secondary effects caused by site and growth stage specific factors (an expected |r| value of 0.36 and RMSE value of 1.46 assuming random error). As a result, this study highlights the importance of accounting for site and growth stage specific factors in remote sensing retrievals for future work developing methods coupling remote sensing with crop growth models.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231; 80NSSC17K0339; NA16SEC4810008
OSTI ID:
1628529
Journal Information:
Remote Sensing, Vol. 11, Issue 16; ISSN 2072-4292
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

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