Abstract
Abstract. Remote sensing image classification has important applications in many fields. However, the uncertainty of remote sensing image classification results will reduce its application value and reliability in these applications. Therefore, the uncertainty of remote sensing image classification results must be accurately and effectively measured. To address the shortcomings of the existing classification uncertainty measurement model in the utilization of image spatial information, this study proposes a novel uncertainty measurement model for remote sensing image classification, which considers the spatial correlation between pixels in images and the effects of local spatial heterogeneity during uncertainty measurement. Specifically, the proposed model first measures the classification uncertainty of an image at the pixel and local spatial levels on the basis of the posterior probability of image classification. Second, the local spatial heterogeneity of an image is quantified, and the proposed model uses the local spatial heterogeneity of the image as a weight to adaptively fuse the uncertainties of the pixel and local spatial levels. Accordingly, a joint uncertainty measurement index is generated for a more accurate and effective evaluation of the uncertainty of remote sensing image classification. Lastly, the classification verification experiments on three publicly available remote sensing images with different spatial resolutions confirm the validity of the proposed model. Moreover, experimental results show that the proposed model has relative superiority and better stability than the existing and commonly used uncertainty measurement models (e.g., information entropy and Eastman’s U) in improving image classification performance.
Highlights
The land cover thematic information obtained through remote sensing image classification has important application value in natural resource management (do Nascimento Bendini et al, 2019), disaster monitoring, urban planning, and decisionmaking (Cui et al, 2018; Mahdavi et al, 2019; Zhang et al, 2018; Zhang et al, 2017)
The effective and accurate evaluation of the uncertainty of remote sensing image classification results is crucial to the further application of these classification results (Chen et al, 2019; Ge, 2013; Khatami et al, 2017; Shi et al, 2015)
Some pixel-based indices or models are used to quantify the classification uncertainty of remote sensing images. The majority of these indices or models are proposed on the basis of the posterior probability of image classification (Bogaert et al, 2017; Giacco et al, 2010)
Summary
The land cover thematic information obtained through remote sensing image classification has important application value in natural resource management (do Nascimento Bendini et al, 2019), disaster monitoring, urban planning, and decisionmaking (Cui et al, 2018; Mahdavi et al, 2019; Zhang et al, 2018; Zhang et al, 2017). Some pixel-based indices or models are used to quantify the classification uncertainty of remote sensing images The majority of these indices or models are proposed on the basis of the posterior probability of image classification (Bogaert et al, 2017; Giacco et al, 2010). When using traditional uncertainty measurement models (e.g., Eastman’s U and information entropy) to estimate the uncertainty of pixels A and B, the two pixels will have the same classification uncertainty This result is unreasonable in the uncertainty assessment of remote sensing image classification.
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