Evaluation of Unmixing Methods for Impervious Surface Area Extraction From Simulated EnMAP Imagery
Distribution of impervious surface area (ISA) is an important input in a wide range of urban ecosystem studies. The future launch of the German hyperspectral satellite environmental mapping and analysis program (EnMAP) in 2019 provides new opportunities for timely and global ISA extraction. The prev...
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| Published in: | IEEE journal of selected topics in applied earth observations and remote sensing Vol. 11; no. 6; pp. 1777 - 1798 |
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| Main Authors: | , |
| Format: | Journal Article |
| Language: | English |
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IEEE
01.06.2018
The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
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| ISSN: | 1939-1404, 2151-1535 |
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| Abstract | Distribution of impervious surface area (ISA) is an important input in a wide range of urban ecosystem studies. The future launch of the German hyperspectral satellite environmental mapping and analysis program (EnMAP) in 2019 provides new opportunities for timely and global ISA extraction. The previously proposed EnMAP applications heavily relied on existing reference endmembers, which may be impractical on a global scale. To overcome this defect, we suggest to use the nonnegative matrix factorization (NMF) method to extract the endmember directly from EnMAP imagery. Three traditional unmixing method (e.g., N-Findr, pixel purity index, and independent component analysis) and four NMF-based methods with different constraints (e.g., sparseness, convex volume, and nonlinearity) were used to obtain series of endmember sets, ISA fraction, and classification maps. In results, the NMF-based methods outperformed the three traditional unmixing method, by achieving 0.5-0.6 R-squared values in the linear regression models between predicted and reference ISA percentages, and over 85% overall accuracy in ISA classification maps. We found that the NMF-based spectral unmixing methods are suitable to work with the EnMAP image, when reference endmember data are unavailable. In addition, we processed the widely used Hydice urban test image with the same methods and compared the resulting ISA percentage/classification maps with the EnMAP results, considering the different features of the Hydice and EnMAP sensors. In the results, it is proved that the EnMAP image has great potential in ISA mapping on a global scale, with reasonable overall accuracy and economical efficiency. |
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| AbstractList | Distribution of impervious surface area (ISA) is an important input in a wide range of urban ecosystem studies. The future launch of the German hyperspectral satellite environmental mapping and analysis program (EnMAP) in 2019 provides new opportunities for timely and global ISA extraction. The previously proposed EnMAP applications heavily relied on existing reference endmembers, which may be impractical on a global scale. To overcome this defect, we suggest to use the nonnegative matrix factorization (NMF) method to extract the endmember directly from EnMAP imagery. Three traditional unmixing method (e.g., N-Findr, pixel purity index, and independent component analysis) and four NMF-based methods with different constraints (e.g., sparseness, convex volume, and nonlinearity) were used to obtain series of endmember sets, ISA fraction, and classification maps. In results, the NMF-based methods outperformed the three traditional unmixing method, by achieving 0.5-0.6 R-squared values in the linear regression models between predicted and reference ISA percentages, and over 85% overall accuracy in ISA classification maps. We found that the NMF-based spectral unmixing methods are suitable to work with the EnMAP image, when reference endmember data are unavailable. In addition, we processed the widely used Hydice urban test image with the same methods and compared the resulting ISA percentage/classification maps with the EnMAP results, considering the different features of the Hydice and EnMAP sensors. In the results, it is proved that the EnMAP image has great potential in ISA mapping on a global scale, with reasonable overall accuracy and economical efficiency. |
| Author | Wang, Jinfei Feng, Boyu |
| Author_xml | – sequence: 1 givenname: Boyu orcidid: 0000-0002-8832-8590 surname: Feng fullname: Feng, Boyu email: bfeng24@uwo.ca organization: Department of Geography, University of Western Ontario, London, ON, Canada – sequence: 2 givenname: Jinfei orcidid: 0000-0002-8404-0530 surname: Wang fullname: Wang, Jinfei email: jfwang@uwo.ca organization: Department of Geography, University of Western Ontario, London, ON, Canada |
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| SubjectTerms | Accuracy Classification Computer simulation Earth Ecosystem studies Environmental mapping and analysis program (EnMAP) Evaluation Hyperspectral imaging Image classification Imagery impervious surface Independent component analysis Indexes Mapping Methods Nonlinear systems Nonlinearity nonnegative matrix factorization (NMF) Regression analysis Regression models Satellites Spatial resolution Surface area urban |
| Title | Evaluation of Unmixing Methods for Impervious Surface Area Extraction From Simulated EnMAP Imagery |
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