Authors
Dmitriev N.
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Degree
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Senior Lecturer, Ural State University of Railway Transport |
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E-mail
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dmitrievnikita13@gmail.com |
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Location
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Yekaterinburg |
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Articles
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Method of reconstruction of values on topographic maps for creating of digital terrain modelWe propose a complex method of reconstruction of values on topographic maps for creating of digital
terrain models by use of produced hypsographic plans and recognized values of altitude marks.
These digital terrain models can be used further as base for decision support system or geographic information
system. Reconstruction is based on interpretation of the plan as weighted directed graph.
Nodes of the graph are contour lines; edges are possibilities of direct transition between two nearestneighbor
contour lines. Weights are values of slopes between two lines. Missed values are finding by
algorithm based upon breadth-first search that analyze subspaces between hypsographic curves with
morphological operations. Mistaken altitude marks are deleted by using comparison of results produced
by started breadth-first search from different nodes. Formulas for morphological analysis and
calculation of slopes are presented. Method is tested on prepared topographic maps based on digital
terrain models generated with diamond-square algorithm. Preparing involves deleting of intermediate
values and replacing indexed values and altitude marks with wrong numbers. Method reconstructs all
values without any mistakes with recognition error up to 37% and speed of 4.1 seconds per megapixel
and can be used in work of geodesic companies.
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