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Application of Landscape Metrics and Object-Oriented Remote Sensing to Detect the Spatial Arrangement of Agricultural Land

Author

Listed:
  • Safdary Rezvan

    (Department of Environment, Faculty of Natural resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran)

  • Soffianian Alireza
  • Pourmanafi Saeid

    (Department of Environmental Sciences, Faculty of Natural Resources, Isfahan University of Technology, Isfahan, Iran)

Abstract

This study aims to investigate crop selection and spatial patterns of agricultural fields in a drought-affected region in Isfahan Province, central Iran. Based on field surveys portraying growth stages of the main crops including wheat, alfalfa, vegetables and fruit trees, three Landsat 8 operational land imager (OLI) images were acquired on March 15 (L1), June 27 (L2) and October 1 (L3), 2015. After performing radiometric and atmospheric corrections, Normalized Difference Vegetation Index (NDVI) maps of the images were produced and introduced to the Multi-Resolution Segmentation algorithm to delineate agricultural fields. An NDVI-based decision algorithm was then developed to identify crops devoted to each field. Finally, a set of landscape metrics including Number of Patches (NP), mean patch size (MPS), mean shape index (MSI), perimeter-to-area ratio (PARA) and Euclidian Nearest Neighborhood Distance (ENN) was utilized to evaluate their respective spatial formation. The results showed that nearly 46% of fields are devoted to wheat indicating that the landscape has been dramatically shifted towards wheat monoculture farming. Moreover, the farmers’ inclination to grow crops in large fields (approximate area of 1 ha) with more regular geometric shapes are considered as an effective way of optimising water use efficiency in areas experiencing significant water shortage.

Suggested Citation

  • Safdary Rezvan & Soffianian Alireza & Pourmanafi Saeid, 2022. "Application of Landscape Metrics and Object-Oriented Remote Sensing to Detect the Spatial Arrangement of Agricultural Land," Quaestiones Geographicae, Sciendo, vol. 41(1), pages 25-35, March.
    • Handle: RePEc:vrs:quageo:v:41:y:2022:i:1:p:25-35:n:4
    DOI: 10.2478/quageo-2022-0002
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