Field validation of NDVI to identify crop phenological signatures
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Published:2024-07-12
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Volume:
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ISSN:1385-2256
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Container-title:Precision Agriculture
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language:en
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Short-container-title:Precision Agric
Author:
Bhatti Muhammad TousifORCID, Gilani Hammad, Ashraf Muhammad, Iqbal Muhammad Shahid, Munir Sarfraz
Abstract
Abstract
Purpose and Methods
Crop identification using remotely sensed imagery provides useful information to make management decisions about land use and crop health. This research used phonecams to acquire the Normalized Difference Vegetation Index (NDVI) of various crops for three crop seasons. NDVI time series from Sentinel (L121-L192) images was also acquired using Google Earth Engine (GEE) for the same period. The resolution of satellite data is low therefore gap filling and smoothening filters were applied to the time series data. The comparison of data from satellite images and phenocam provides useful insight into crop phenology. The results show that NDVI is generally underestimated when compared to phenocam data. The Savitzky-Golay (SG) and some other gap filling and smoothening methods are applied to NDVI time series based on satellite images. The smoothened NDVI curves are statistically compared with daily NDVI series based on phenocam images as a reference.
Results
The SG method has performed better than other methods like moving average. Furthermore, polynomial order has been found to be the most sensitive parameter in applying SG filter in GEE. Sentinel (L121-L192) image was used to identify wheat during the year 2022–2023 in Sargodha district where experimental fields were located. The Random Forest Machine Leaning algorithm was used in GEE as a classifier.
Conclusion
The classification accuracy has been found 97% using this algorithm which suggests its usefulness in applying to other areas with similar agro-climatic characteristics.
Funder
United States Agency for International Development
Publisher
Springer Science and Business Media LLC
Reference80 articles.
1. Aasen, H., Kirchgessner, N., Walter, A., & Liebisch, F. (2020). PhenoCams for field phenotyping: Using very high temporal resolution digital repeated photography to investigate interactions of growth, phenology, and harvest traits. Frontiers in Plant Science, 11, 593. https://doi.org/10.3389/fpls.2020.00593 2. Ahmad, A., Khan, M. R., Shah, S. H. H., Kamran, M. A., Wajid, S. A., Amin, M., & Khan, I. A. (2019). Agro-ecological zones of Punjab Pakistan. Food and Agriculture Organization. 3. Ahrends, H. E., Etzold, S., Kutsch, W. L., Stöckli, R., Brügger, R., Jeanneret, F., & Eugster, W. (2009). Tree phenology and carbon dioxide fluxes: Use of digital photography for process-based interpretation at the ecosystem scale. Climate Research, 39, 261–274. https://doi.org/10.3354/cr00811 4. Akbari, E., Darvishi Boloorani, A., Neysani Samany, N., Hamzeh, S., Soufizadeh, S., & Pignatti, S. (2020). Crop mapping using random forest and particle swarm optimization based on multi-temporal sentinel-2. Remote Sensing, 12(9), 1449. https://doi.org/10.3390/rs12091449 5. Archer, K. J., & Kimes, R. V. (2008). Empirical characterization of random forest variable importance measures. Computational Statistics & Data Analysis, 52(4), 2249–2260. https://doi.org/10.1016/j.csda.2007.08.015
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