Identification and Determination of Wheat Cultivated Farms Using Vegetation Index Reflectance Changes and Spatial Analysis in Western of Iran

Document Type : Research Paper

Authors

1 Faculty of climatology, Faculty of Humanities, Zanjan University, Zanjan, Iran

2 Faculty of Meteorology, Faculty of Humanities, Zanjan University, Zanjan, Iran

3 Department of Meteorology, Faculty of Geographical Sciences, Kharazmi University, Tehran, Iran

Abstract

   Mapping and spatial analysis of wheat fields are very important in studying macroeconomic and social issues, including agricultural management. Highly variable crop pattern maps and its preparation using terrestrial data are associated with many problems. The purpose of this study is to implement a practical method for extracting wheat fields by using changes in vegetation index and spatial analysis of wheat fields in western of Iran. Investigation of the changes curve of vegetation index of wheat typic farms showed that the highest amount of reflection index of wheat farms is in June and early July and after harvest the reflectance index decreases extremely. In this regard, Sentile sensor data was processed in the Earth Engine system and the 12-month vegetation index of 1398 was extracted as a data set. By introducing training data to the data set created by the support vector machine classification method, the land use of the study area was obtained in five classes. By applying altitude filter and removing the extracted fields above 3,000 meters, the distribution map of wheat fields was verified with the remaining 48 ground data. The total accuracy and the kappa coefficient were obtained 0.86 and 0.79, respectively. Since in the proposed method, more training data are given to the algorithm, the overall accuracy of the classification is increased. The spatial pattern of wheat fields with the mean function of the nearest neighbor and P_value <0.05 indicating the cluster dispersion of the fields and the Caripley function indicating the non-random scattering of wheat fields up to distances of 21,000 meters. The results of this research and its output maps can be used to obtain information for agricultural planning as well as the allocation and spatial distribution of resources and facilities.

Keywords

References

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Iranian Journal of Soil and Water Research
Volume 52, Issue 6 - Serial Number 66
August 2021
Pages 1697-1708

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