Geographic Object-based Image Analysis for Small Farmlands using Machine Learning Techniques on Multispectral Sentinel-2 Data | [Proceedings of the Pakistan Academy of Sciences: A. Physical and Computational Sciences • 2024]

Author(s):

1. Najam Aziz: Department of Computer Systems Engineering, University of Engineering and Technology, Peshawar, 25120 Pakistan; National Center for Big Data & Cloud Computing (NCBC), University of Engineering and Technology Peshawar, 25120 Pakistan

2. Nasru Minallah: Department of Computer Systems Engineering, University of Engineering and Technology, Peshawar, 25120 Pakistan; National Center for Big Data & Cloud Computing (NCBC), University of Engineering and Technology Peshawar, 25120 Pakistan

3. Muhammad Hasanat: Department of Computer Systems Engineering, University of Engineering and Technology, Peshawar, 25120 Pakistan; National Center for Big Data & Cloud Computing (NCBC), University of Engineering and Technology Peshawar, 25120 Pakistan

4. Muhammad Ajmal: Department of Agricultural Engineering, University of Engineering and Technology Peshawar, 25120 Pakistan

Abstract:

This study intends to classify the land cover of an area especially small farmlands using object-based image analysis (OBIA) method and evaluates the performance of a supervised classifier. Multi-spectral Sentinel-2 imagery which is freely available is used and four supervised classifiers are applied to it. The study area was divided into four major classes namely Urban, Wheat, Tobacco, and other vegetation with varying accuracy values. The imagery was ifrst resampled to 10 m spatial resolution and then NDI45 is layer stacked to it. A widely used MRS technique is used for delineating the objects in the imagery. Finally, classification is done through four supervised classifiers k-Nearest Neighbour (kNN), Bayes classifier, Decision Tree (DT), and Random Forest (RF). The accuracy was evaluated through a confusion matrix. The results show that Sentinel-2 imagery is capable of producing thematically detailed land cover maps via the Geographic Object-Based Image Analysis (GEOBIA) approach with accuracies of k-NN 95%, Bayes classifier 88%, DT 81% and RF 79%.

Page(s): 41-49

DOI: 10.53560/PPASA(61-1)795

Published: Journal: Proceedings of the Pakistan Academy of Sciences: A. Physical and Computational Sciences, Volume: 61, Issue: 1, Year: 2024

Keywords:

Sentinel2 , segmentation , Classification , geospatial analysis , Landcover , GEOBIA

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