Field validation of NDVI to identify crop phenological signatures
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...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
| Published: |
Springer
2024
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/149303 |
| _version_ | 1855514162445156352 |
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| author | Bhatti, Muhammad Tousif Gilani, Hammad Ashraf, M. Iqbal, Muhammad Shahid Munir, Sarfraz |
| author_browse | Ashraf, M. Bhatti, Muhammad Tousif Gilani, Hammad Iqbal, Muhammad Shahid Munir, Sarfraz |
| author_facet | Bhatti, Muhammad Tousif Gilani, Hammad Ashraf, M. Iqbal, Muhammad Shahid Munir, Sarfraz |
| author_sort | Bhatti, Muhammad Tousif |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | 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. |
| format | Journal Article |
| id | CGSpace149303 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2024 |
| publishDateRange | 2024 |
| publishDateSort | 2024 |
| publisher | Springer |
| publisherStr | Springer |
| record_format | dspace |
| spelling | CGSpace1493032025-10-26T12:54:49Z Field validation of NDVI to identify crop phenological signatures Bhatti, Muhammad Tousif Gilani, Hammad Ashraf, M. Iqbal, Muhammad Shahid Munir, Sarfraz crops phenology normalized difference vegetation index satellite imagery image processing time series analysis wheat remote sensing 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. 2024-10 2024-07-30T06:35:15Z 2024-07-30T06:35:15Z Journal Article https://hdl.handle.net/10568/149303 en Open Access Springer Bhatti, Muhammad Tousif; Gilani, Hammad; Ashraf, M.; Iqbal, Muhammad Shahid; Munir, Sarfraz. 2024. Field validation of NDVI to identify crop phenological signatures. Precision Agriculture, 25(5):2245-2270. [doi: https://doi.org/10.1007/s11119-024-10165-6] |
| spellingShingle | crops phenology normalized difference vegetation index satellite imagery image processing time series analysis wheat remote sensing Bhatti, Muhammad Tousif Gilani, Hammad Ashraf, M. Iqbal, Muhammad Shahid Munir, Sarfraz Field validation of NDVI to identify crop phenological signatures |
| title | Field validation of NDVI to identify crop phenological signatures |
| title_full | Field validation of NDVI to identify crop phenological signatures |
| title_fullStr | Field validation of NDVI to identify crop phenological signatures |
| title_full_unstemmed | Field validation of NDVI to identify crop phenological signatures |
| title_short | Field validation of NDVI to identify crop phenological signatures |
| title_sort | field validation of ndvi to identify crop phenological signatures |
| topic | crops phenology normalized difference vegetation index satellite imagery image processing time series analysis wheat remote sensing |
| url | https://hdl.handle.net/10568/149303 |
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