Acta Geodaetica et Cartographica Sinica ›› 2024, Vol. 53 ›› Issue (1): 146-157.doi: 10.11947/j.AGCS.2024.20230005

• Cartography and Geoinformation • Previous Articles     Next Articles

Knowledge-guided intelligent recognition of the scale for fragmented raster topographic maps

REN Jiaxin1,2,3, LIU Wanzeng2,3,4, CHEN Jun2,3, ZHANG Lan2,3,5, TAO Yuan2,3,5, ZHU Xiuli2,3,4, ZHAO Tingting2,3,4, LI Ran2,3,4, ZHAI Xi2,3,4, WANG Haiqing2,3,4, ZHOU Xiaoguang1, HOU Dongyang1, WANG Yong6   

  1. 1. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
    2. National Geomatics Center of China, Beijing 100830, China;
    3. Key Laboratory of Spatio-temporal Information and Intelligent Services, Ministry of Natural Resources of China, Beijing 100830, China;
    4. Hubei Luojia Laboratory, Wuhan 430079, China;
    5. School of Environment and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China;
    6. Chinese Academy of Surveying and Mapping, Beijing 100830, China
  • Received:2023-01-06 Revised:2023-12-05 Published:2024-02-06
  • Supported by:
    The Major Program of the National Natural Science Foundation of China (No. 42394062); The National Key Research and Development Program of China (No. 2022YFB3904205); The Open Fund of Hubei Luojia Laboratory (No. 220100037)

Abstract: Determining the topographic map scale is a critical basis for assessing the degree of confidentiality of topographic maps. In this study, we propose a solution to the challenge of estimating the scale of fragmented raster topographic maps by leveraging a priori knowledge of scale-related features, constructing an expert knowledge image pyramid dataset (EKIPD) under guided expert knowledge, and applying deep convolutional neural network algorithms to create a hybrid intelligent model that synergistically combines knowledge, data, and algorithm. The EKIPD dataset captures a representative sample distribution of fragmented topographic maps of varying sizes, which enables us to statistically determine the optimal recognition size (ORS) for sub-map recognition. The ORS then serves as a stepping threshold to partition the topographic maps into recognizable sub-maps. Each sub-map is independently processed through the model to obtain individual predictions, which are subsequently integrated to infer the map scale. Experimental validation shows that this method achieves an accuracy of approximately 97%, demonstrating its efficacy.

Key words: intelligentized surveying and mapping, expert knowledge, hybrid intelligence, raster topographic map, scale recognition, deep convolutional neural network

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