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Class imbalance in unsupervised change detection – A diagnostic analysis from urban remote sensing

Leichtle, Tobias and Geiß, Christian and Lakes, Tobia and Taubenböck, Hannes (2017) Class imbalance in unsupervised change detection – A diagnostic analysis from urban remote sensing. International Journal of Applied Earth Observation and Geoinformation, 60, pp. 83-98. Elsevier. DOI: 10.1016/j.jag.2017.04.002 ISSN 0303-2434

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Official URL: http://www.sciencedirect.com/science/article/pii/S0303243417300867

Abstract

Automatic monitoring of changes on the Earth’s surface is an intrinsic capability and simultaneously a persistent methodological challenge in remote sensing, especially regarding imagery with very-high spatial resolution (VHR) and complex urban environments. In order to enable a high level of automatization, the change detection problem is solved in an unsupervised way to alleviate efforts associated with collection of properly encoded prior knowledge. In this context, this paper systematically investigates the nature and effects of class distribution and class imbalance in an unsupervised binary change detection application based on VHR imagery over urban areas. For this purpose, a diagnostic framework for sensitivity analysis of a large range of possible degrees of class imbalance is presented, which is of particular importance with respect to unsupervised approaches where the content of images and thus the occurrence and the distribution of classes are generally unknown a priori. Furthermore, this framework can serve as a general technique to evaluate model transferability in any two-class classification problem. The applied change detection approach is based on object-based difference features calculated from VHR imagery and subsequent unsupervised two-class clustering using k‐means, genetic k-means and self-organizing map (SOM) clustering. The results from two test sites with different structural characteristics of the built environment demonstrated that classification performance is generally worse in imbalanced class distribution settings while best results were reached in balanced or close to balanced situations. Regarding suitable accuracy measures for evaluating model performance in imbalanced settings, this study revealed that the Kappa statistics show significant response to class distribution while the true skill statistic was widely insensitive to imbalanced classes. In general, the genetic k-means clustering algorithm achieved the most robust results with respect to class imbalance while the SOM clustering exhibited a distinct optimization towards a balanced distribution of classes.

Item URL in elib:https://elib.dlr.de/112072/
Document Type:Article
Title:Class imbalance in unsupervised change detection – A diagnostic analysis from urban remote sensing
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Leichtle, Tobiastobias.leichtle (at) slu-web.deUNSPECIFIED
Geiß, ChristianChristian.Geiss (at) dlr.deUNSPECIFIED
Lakes, Tobiatobia.lakes (at) geo.hu-berlin.deUNSPECIFIED
Taubenböck, HannesHannes.Taubenboeck (at) dlr.deUNSPECIFIED
Date:August 2017
Journal or Publication Title:International Journal of Applied Earth Observation and Geoinformation
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:60
DOI :10.1016/j.jag.2017.04.002
Page Range:pp. 83-98
Publisher:Elsevier
ISSN:0303-2434
Status:Published
Keywords:Change detection; Object-based image analysis (OBIA); Very-high resolution (VHR) remote sensing; Class imbalance; Clustering; Urban environment
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Zivile Kriseninformation und Georisiken (old), R - Remote sensing and geoscience
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center > Geo Risks and Civil Security
German Remote Sensing Data Center > Land Surface
Deposited By: Leichtle, Tobias
Deposited On:05 Jul 2017 08:58
Last Modified:06 Sep 2019 15:16

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