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Learning Cartographic Building Generalization with Deep Convolutional Neural Networks

Institute of Cartography and Geoinformatics, Leibniz University Hannover, Appelstraße 9a, 30167 Hannover, Germany
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ISPRS Int. J. Geo-Inf. 2019, 8(6), 258; https://doi.org/10.3390/ijgi8060258
Received: 16 April 2019 / Revised: 22 May 2019 / Accepted: 27 May 2019 / Published: 30 May 2019
(This article belongs to the Special Issue Multidimensional and Multiscale GIS)
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Abstract

Cartographic generalization is a problem, which poses interesting challenges to automation. Whereas plenty of algorithms have been developed for the different sub-problems of generalization (e.g., simplification, displacement, aggregation), there are still cases, which are not generalized adequately or in a satisfactory way. The main problem is the interplay between different operators. In those cases the human operator is the benchmark, who is able to design an aesthetic and correct representation of the physical reality. Deep learning methods have shown tremendous success for interpretation problems for which algorithmic methods have deficits. A prominent example is the classification and interpretation of images, where deep learning approaches outperform traditional computer vision methods. In both domains-computer vision and cartography-humans are able to produce good solutions. A prerequisite for the application of deep learning is the availability of many representative training examples for the situation to be learned. As this is given in cartography (there are many existing map series), the idea in this paper is to employ deep convolutional neural networks (DCNNs) for cartographic generalizations tasks, especially for the task of building generalization. Three network architectures, namely U-net, residual U-net and generative adversarial network (GAN), are evaluated both quantitatively and qualitatively in this paper. They are compared based on their performance on this task at target map scales 1:10,000, 1:15,000 and 1:25,000, respectively. The results indicate that deep learning models can successfully learn cartographic generalization operations in one single model in an implicit way. The residual U-net outperforms the others and achieved the best generalization performance. View Full-Text
Keywords: cartography; map generalization; deep convolutional neural networks; geometry simplification cartography; map generalization; deep convolutional neural networks; geometry simplification
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Feng, Y.; Thiemann, F.; Sester, M. Learning Cartographic Building Generalization with Deep Convolutional Neural Networks. ISPRS Int. J. Geo-Inf. 2019, 8, 258.

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