| Autor: |
Paulo Cesar Sentelhas, Mark L. Gleason, Robert C. Seem, W. F. Pfender, Anna Dalla Marta, Kwang Soo Kim, Terry J. Gillespie, Forrest W. Nutter, S. Elwynn Taylor, Simone Orlandini, Leonard B. Coop |
| Rok vydání: |
2010 |
| Předmět: |
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| Zdroj: |
Agricultural and Forest Meteorology. 150:871-880 |
| ISSN: |
0168-1923 |
| DOI: |
10.1016/j.agrformet.2010.02.006 |
| Popis: |
Leaf wetness duration (LWD) models based on empirical approaches offer practical advantages over physically based models in agricultural applications, but their spatial portability is questionable because they may be biased to the climatic conditions under which they were developed. In our study, spatial portability of three LWD models with empirical characteristic s-aR Hthreshold model, a decision tree model with wind speed correction, and a fuzzy logic model - was evaluated using weather data collected in Brazil, Canada, Costa Rica, Italy and the USA. The fuzzy logic model was more accurate than the other models in estimating LWD measured by painted leaf wetness sensors. The fraction of correct estimates for the fuzzy logic model was greater (0.87) than for the other models (0.85-0.86) across 28 sites where painted sensors were installed, and the degree of agreement k statistic between the model and painted sensors was greater for the fuzzy logic model (0.71) than that for the other models (0.64-0.66). Values of the k statistic for the fuzzy logic model were also less variable across sites than those of the other models. When model estimates were compared with measurements from unpainted leaf wetness sensors, the fuzzy logic model had less mean absolute error (2.5 h day −1 |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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