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5602.2 - A Novel Method for Reconstructing Broken Contour Lines Extracted from Scanned Topographic Maps

Wednesday, July 5
3:10 PM - 3:30 PM
Location: Delaware B

It is known that after segmentation and morphological operations on scanned topographic maps, gaps occur in contour lines. It is also well known that filling these gaps and reconstruction of contour lines with high accuracy and completeness is not an easy problem. In this paper, a novel method is proposed dedicated in automatic or semiautomatic filling up caps and reconstructing broken contour lines in binary images. The key part of end points’ auto-matching and reconnecting is deeply discussed after introducing the procedure of reconstruction, in which some key algorithms and mechanisms are presented and realized, including multiple incremental backing trace to get weighted average direction angle of end points, the max constraint angle control mechanism based on the multi-ple gradient ranks, combination of weighted Euclidean distance and deviation angle to determine the optimum matching end point, bidirectional parabola control, etc. Lastly, experimental comparisons based on typically samples are complemented between proposed method and the other representative method, the results indicate that the former holds higher accuracy and completeness, better stability and applicability.

Feng Wang

Beilin district, Yanta road middle, No. 1, Xi’an, Shan’xi, China
Xi'an Institute of Surveying and mapping

Wang Feng, male, born in1981, from xi'an, shan'xi province, china. PH.D candidate, surveying and mapping engineer, main research direction is designing and producing digital map, designing and building spatial database, database-driven cartograph, GIS system application and development, scaned-map image recognition and processing, 3D simulation and modeling. Email: bjzxgsb@163.com.

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Pingzhi Liu

Researcher
Xian institute of Surveying and Mapping

Liu Pingzhi was born in Hunan province, China, in 1964. He received the B.S. , M.S. degrees and Ph.D. degree in Cartographic and Geographic Information Engineering from Zhengzhou institute of Surveying and Mapping, in 1984 , 1992 and 2005.
From 1996 to 2001, he was a Senior Engineer with Xian institute of Surveying and Mapping. Since 2001, he has been an Researcher with Xian institute of Surveying and Mapping. His research interests include Intelligent Acquisition and Quality Control of Geographic Information , Geospatial Database and Geographic Information Applications and Services.

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Yun Yang

Xi'an Institute of Surveying and mapping

Yang Yun, female, born in1969, PH.D, main research direction is science of surveying and mapping, image processing, intelligent recognition.

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Wei Haiping

Zhengzhou Institute of Surveying and Mapping

Wei Haiping, male, born in1967, PH.D, main research direction is spatial database, GIS application and development, geographical information servic development.

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Samantha T. Arundel

Research Geographer
U.S. Geological Survey

Samantha received her Ph.D. in geography from Arizona State University in 2000, and was an assistant and associate professor at Northern Arizona University until 2009, when she joined the USGS. There she has served as elevation and hydrography specialist for the Applied Research and Technology Branch. During this time, she led the development team in automating contour production for the USTopo product; and most recently, served as the program manager for the automation of the National Elevation Dataset production, in its transition from EROS to the NGTOC. Recently Sam moved to the Center of Excellence in Geographic Information Science, where she is a research geographer conducting terrain semantics studies.

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