Replacing human interpretation of agricultural land in Afghanistan with a deep convolutional neural network

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dc.contributor.authorHamer, A. M.
dc.contributor.authorSimms, Daniel M.
dc.contributor.authorWaine, Toby William
dc.date.accessioned2021-01-18T14:51:08Z
dc.date.available2021-01-18T14:51:08Z
dc.date.issued2021-01-18
dc.description.abstractAfghanistan’s annual opium survey relies upon time-consuming human interpretation of satellite images to map the area of potential poppy cultivation for statistical sample design. Deep Convolutional Neural Networks (CNNs) have shown ground-breaking performance for image classification tasks by encoding local contextual information, in some cases outperforming trained analysts. In this study, we investigate the development of a CNN to automate the classification of agriculture from medium-resolution satellite imagery as an alternative to manual interpretation. The residual network (ResNet50) CNN architecture was trained and validated for delineating the agricultural area using labelled multi-seasonal Disaster Monitoring Constellation (DMC) satellite imagery (32 m) of Helmand and Kandahar provinces. The effect of input image chip size, training sampling strategy, elevation data, and multi-seasonal imagery were investigated. The best-performing single-year classification used an input chip size of 33 × 33 pixels, a targeted sampling strategy and transfer learning, resulting in high overall accuracy (94%). The inclusion of elevation data marginally lowered performance (93%). Multi-seasonal classification achieved an overall accuracy of 89% using the previous two years’ data. Only 25% of the target year’s training samples were necessary to update the model to achieve >94% overall accuracy. A data-driven approach to automate agricultural mask production using CNNs is proposed to reduce the burden of human interpretation. The ability to continually update CNN models with new data has the potential to significantly improve automatic classification of vegetation across yearsen_UK
dc.identifier.citationHamer AM, Simms DM, Waine TW. (2021) Replacing human interpretation of agricultural land in Afghanistan with a deep convolutional neural network. International Journal of Remote Sensing, Volume 42, Issue 8, 2021, pp. 3017-3038en_UK
dc.identifier.issn0143-1161
dc.identifier.urihttps://doi.org/10.1080/01431161.2020.1864059
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/16188
dc.language.isoenen_UK
dc.publisherTaylor and Francisen_UK
dc.rightsAttribution-NonCommercial 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/*
dc.subjectGovernment of Afghanistanen_UK
dc.subjectConvolutional Neural Networks (CNNs)en_UK
dc.subjectgradient-based optimization algorithmen_UK
dc.subjectclassification of vegetationen_UK
dc.titleReplacing human interpretation of agricultural land in Afghanistan with a deep convolutional neural networken_UK
dc.typeArticleen_UK

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