SUPPORT VECTOR MACHINE CLASSIFICATION OF OBJECT-BASED DATA FOR CROP MAPPING, USING MULTI-TEMPORAL LANDSAT IMAGERY
Crop mapping and time series analysis of agronomic cycles are critical for monitoring land use and land management practices, and analysing the issues of agro-environmental impacts and climate change. Multi-temporal Landsat data can be used to analyse decadal changes in cropping patterns at field...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2012-07-01
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| Series: | The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| Online Access: | https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XXXIX-B7/185/2012/isprsarchives-XXXIX-B7-185-2012.pdf |
| _version_ | 1811309904824107008 |
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| author | R. Devadas R. J. Denham M. Pringle |
| author_facet | R. Devadas R. J. Denham M. Pringle |
| author_sort | R. Devadas |
| collection | DOAJ |
| description | Crop mapping and time series analysis of agronomic cycles are critical for monitoring land use and land management practices, and
analysing the issues of agro-environmental impacts and climate change. Multi-temporal Landsat data can be used to analyse decadal
changes in cropping patterns at field level, owing to its medium spatial resolution and historical availability. This study attempts to
develop robust remote sensing techniques, applicable across a large geographic extent, for state-wide mapping of cropping history in
Queensland, Australia. In this context, traditional pixel-based classification was analysed in comparison with image object-based
classification using advanced supervised machine-learning algorithms such as Support Vector Machine (SVM).
<br><br>
For the Darling Downs region of southern Queensland we gathered a set of Landsat TM images from the 2010–2011 cropping
season. Landsat data, along with the vegetation index images, were subjected to multiresolution segmentation to obtain polygon
objects. Object-based methods enabled the analysis of aggregated sets of pixels, and exploited shape-related and textural variation, as
well as spectral characteristics. SVM models were chosen after examining three shape-based parameters, twenty-three textural
parameters and ten spectral parameters of the objects.
<br><br>
We found that the object-based methods were superior to the pixel-based methods for classifying 4 major landuse/land cover classes,
considering the complexities of within field spectral heterogeneity and spectral mixing. Comparative analysis clearly revealed that
higher overall classification accuracy (95%) was observed in the object-based SVM compared with that of traditional pixel-based
classification (89%) using maximum likelihood classifier (MLC). Object-based classification also resulted speckle-free images.
Further, object-based SVM models were used to classify different broadacre crop types for summer and winter seasons. The
influence of different shape, textural and spectral variables, and their weights on crop-mapping accuracy, was also examined.
Temporal change in the spectral characteristics, specifically through vegetation indices derived from multi-temporal Landsat data,
was found to be the most critical information that affects the accuracy of classification. However, use of these variables was
constrained by the data availability and cloud cover. |
| first_indexed | 2024-04-13T09:50:39Z |
| format | Article |
| id | doaj.art-111929ad2afc4914acc86d340298434e |
| institution | Directory Open Access Journal |
| issn | 1682-1750 2194-9034 |
| language | English |
| last_indexed | 2024-04-13T09:50:39Z |
| publishDate | 2012-07-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| spelling | doaj.art-111929ad2afc4914acc86d340298434e2022-12-22T02:51:37ZengCopernicus PublicationsThe International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences1682-17502194-90342012-07-01XXXIX-B718519010.5194/isprsarchives-XXXIX-B7-185-2012SUPPORT VECTOR MACHINE CLASSIFICATION OF OBJECT-BASED DATA FOR CROP MAPPING, USING MULTI-TEMPORAL LANDSAT IMAGERYR. Devadas0R. J. Denham1M. Pringle2Remote Sensing Centre, Ecosciences Percinct, GPO Box 2454, Brisbane, Queensland 4001, AustraliaRemote Sensing Centre, Ecosciences Percinct, GPO Box 2454, Brisbane, Queensland 4001, AustraliaRemote Sensing Centre, Ecosciences Percinct, GPO Box 2454, Brisbane, Queensland 4001, AustraliaCrop mapping and time series analysis of agronomic cycles are critical for monitoring land use and land management practices, and analysing the issues of agro-environmental impacts and climate change. Multi-temporal Landsat data can be used to analyse decadal changes in cropping patterns at field level, owing to its medium spatial resolution and historical availability. This study attempts to develop robust remote sensing techniques, applicable across a large geographic extent, for state-wide mapping of cropping history in Queensland, Australia. In this context, traditional pixel-based classification was analysed in comparison with image object-based classification using advanced supervised machine-learning algorithms such as Support Vector Machine (SVM). <br><br> For the Darling Downs region of southern Queensland we gathered a set of Landsat TM images from the 2010–2011 cropping season. Landsat data, along with the vegetation index images, were subjected to multiresolution segmentation to obtain polygon objects. Object-based methods enabled the analysis of aggregated sets of pixels, and exploited shape-related and textural variation, as well as spectral characteristics. SVM models were chosen after examining three shape-based parameters, twenty-three textural parameters and ten spectral parameters of the objects. <br><br> We found that the object-based methods were superior to the pixel-based methods for classifying 4 major landuse/land cover classes, considering the complexities of within field spectral heterogeneity and spectral mixing. Comparative analysis clearly revealed that higher overall classification accuracy (95%) was observed in the object-based SVM compared with that of traditional pixel-based classification (89%) using maximum likelihood classifier (MLC). Object-based classification also resulted speckle-free images. Further, object-based SVM models were used to classify different broadacre crop types for summer and winter seasons. The influence of different shape, textural and spectral variables, and their weights on crop-mapping accuracy, was also examined. Temporal change in the spectral characteristics, specifically through vegetation indices derived from multi-temporal Landsat data, was found to be the most critical information that affects the accuracy of classification. However, use of these variables was constrained by the data availability and cloud cover.https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XXXIX-B7/185/2012/isprsarchives-XXXIX-B7-185-2012.pdf |
| spellingShingle | R. Devadas R. J. Denham M. Pringle SUPPORT VECTOR MACHINE CLASSIFICATION OF OBJECT-BASED DATA FOR CROP MAPPING, USING MULTI-TEMPORAL LANDSAT IMAGERY The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| title | SUPPORT VECTOR MACHINE CLASSIFICATION OF OBJECT-BASED DATA FOR CROP MAPPING, USING MULTI-TEMPORAL LANDSAT IMAGERY |
| title_full | SUPPORT VECTOR MACHINE CLASSIFICATION OF OBJECT-BASED DATA FOR CROP MAPPING, USING MULTI-TEMPORAL LANDSAT IMAGERY |
| title_fullStr | SUPPORT VECTOR MACHINE CLASSIFICATION OF OBJECT-BASED DATA FOR CROP MAPPING, USING MULTI-TEMPORAL LANDSAT IMAGERY |
| title_full_unstemmed | SUPPORT VECTOR MACHINE CLASSIFICATION OF OBJECT-BASED DATA FOR CROP MAPPING, USING MULTI-TEMPORAL LANDSAT IMAGERY |
| title_short | SUPPORT VECTOR MACHINE CLASSIFICATION OF OBJECT-BASED DATA FOR CROP MAPPING, USING MULTI-TEMPORAL LANDSAT IMAGERY |
| title_sort | support vector machine classification of object based data for crop mapping using multi temporal landsat imagery |
| url | https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XXXIX-B7/185/2012/isprsarchives-XXXIX-B7-185-2012.pdf |
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