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A comparative analysis of different pixel and object-based classification algorithms using multi-source high spatial resolution satellite data for LULC mapping

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Abstract

The preparation of accurate LULC is of great importance as it is used in various studies ranging from change detection to geospatial modelling. Literature offers studies comparing different classification algorithms/approaches to prepare LULC maps. However, still there is a lack of studies that can provide a comprehensive analysis on widely used classification algorithms. Hence, in the present study, nine different pixel- and object-based classification algorithms have been used to compare their relative effectiveness in generating remotely sensed LULC maps. The algorithms include maximum likelihood, neural network, support vector machine (linear, polynomial, RBF (radial basis function), sigmoid kernels), random forest (RF) and Naive Bayes for pixel-based classification and maximum likelihood algorithm for object-based classification (OBC) approach. Additionally, the study has analysed the impact of different types of satellite datasets (i.e., high resolution image and resolution merged images of same resolution) on relative effectiveness of the algorithms in classifying the satellite imageries accurately. High resolution (5 m) satellite image LISS 4 MX70, resolution merged satellite images (5 m) LISS 3 merged with LISS 4 mono and LISS 3 merged with IRS-1D are employed for classification. 27 LULC maps (9 classification algorithms * 3 images) are evaluated for comparing classification algorithms. The accuracy assessment of the images is carried out using confusion matrix and Mc Nemar’s test. It has been observed that (1) the performance of all classification algorithms differs from each other and (2) resolution merged data impacts classification accuracy differently when compared to other satellite image of same spatial resolution. RF and OBC are identified as potential classifiers with majority of datasets. The results suggest that due to heterogeneity in urban land-use, it is difficult to achieve higher overall accuracy in classifying a large urban area using 5 m resolution satellite dataset. Moreover, visual examination of LULC should be considered for choosing better classification approach as pixel-based approach produces salt-pepper effect in LULC, whereas OBC produces visually smoothened LULC and identifies even smaller objects in urban landscape. The comparative evaluation of different image types reveal that RF performs better with all images, however, the performance of OBC was found to be improved with original high-resolution data.

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Availability of data and material

There are no linked research data sets for this submission. The data that has been used is confidential.

Code availability

ERDAS® IMAGINE 2016, ArcGIS 10.5 and R version 3.3.2 softwares are used in this manuscript.

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Acknowledgements

The authors extend their appreciation to the Deanship of Scientific Research at King Khalid University for funding this work under grant number (RGP2/194/42). The authors are thankful to National Aeronautics and Space Administration (NASA) and U.S. Geological Survey (USGS) for providing freely available Landsat data, used in this manuscript. The authors are thankful to Geoinformatics laboratory, TERI School of Advanced Studies for providing access to software.

Funding

This research received partial grant from United Nations University-Institute for the Advanced Study of Sustainability. The authors extend their appreciation to the Deanship of Scientific Research at King Khalid University for funding this work.

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The author AB and CKS prepared the concept of manuscript. Analysis was conducted by AB, JM and supervised by CKS. Draft writing was done by AB, SP, JM and edited by SP, SG, and CKS.

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Correspondence to Chander Kumar Singh.

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Balha, A., Mallick, J., Pandey, S. et al. A comparative analysis of different pixel and object-based classification algorithms using multi-source high spatial resolution satellite data for LULC mapping. Earth Sci Inform 14, 2231–2247 (2021). https://doi.org/10.1007/s12145-021-00685-4

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