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Dimensionality Reduction and Classification of Hyperspectral Images Using Object-Based Image Analysis

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Abstract

Object-based image analysis (OBIA) has attained great importance for the delineation of landscape features, particularly with the accessibility to satellite images with high spatial resolution acquired by recent sensors. Statistical parametric classifiers have become ineffective mainly due to their assumption of normal distribution, vast increase in the dimensions of the data and availability of limited ground sample data. Despite pixel-based approaches, OBIA takes semantic information of extracted image objects into consideration, and thus provides more comprehensive image analysis. In this study, Indian Pines hyperspectral data set, which was recorded by the AVIRIS hyperspectral sensor, was used to analyse the effects of high dimensional data with limited ground reference data. To avoid the dimensionality curse, principal component analysis (PCA) and feature selection based on Jeffries–Matusita (JM) distance were utilized. First 19 principal components representing 98.5% of the image were selected using the PCA technique whilst 30 spectral bands of the image were determined using JM distance. Nearest neighbour (NN) and random forest (RF) classifiers were employed to test the performances of pixel- and object-based classification using conventional accuracy metrics. It was found that object-based approach outperformed the traditional pixel-based approach for all cases (up to 18% improvement). Also, the RF classifier produced significantly more accurate results (up to 10%) than the NN classifier.

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Authors and Affiliations

  1. Department of Geomatics Engineering, Gebze Technical University, 41400, Gebze, Kocaeli, Turkey

    Taskin Kavzoglu, Hasan Tonbul, Merve Yildiz Erdemir & Ismail Colkesen

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  1. Taskin Kavzoglu
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  2. Hasan Tonbul
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  3. Merve Yildiz Erdemir
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  4. Ismail Colkesen
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Correspondence to Taskin Kavzoglu.

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Kavzoglu, T., Tonbul, H., Yildiz Erdemir, M. et al. Dimensionality Reduction and Classification of Hyperspectral Images Using Object-Based Image Analysis. J Indian Soc Remote Sens 46, 1297–1306 (2018). https://doi.org/10.1007/s12524-018-0803-1

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  • DOI: https://doi.org/10.1007/s12524-018-0803-1

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