Details

Title

Area collapse algorithm computing new curve of 2D geometric objects

Journal title

Geodesy and Cartography

Yearbook

2017

Volume

vol. 66

Numer

No 1

Publication authors

Keywords

shape analysis ; Polygon collapse ; medial axis ; geometry processing ; spatial database

Divisions of PAS

Nauki Techniczne

Abstract

The processing of cartographic data demands human involvement. Up-to-date algorithms try to automate a part of this process. The goal is to obtain a digital model, or additional information about shape and topology of input geometric objects. A topological skeleton is one of the most important tools in the branch of science called shape analysis. It represents topological and geometrical characteristics of input data. Its plot depends on using algorithms such as medial axis, skeletonization, erosion, thinning, area collapse and many others. Area collapse, also known as dimension change, replaces input data with lower-dimensional geometric objects like, for example, a polygon with a polygonal chain, a line segment with a point. The goal of this paper is to introduce a new algorithm for the automatic calculation of polygonal chains representing a 2D polygon. The output is entirely contained within the area of the input polygon, and it has a linear plot without branches. The computational process is automatic and repeatable. The requirements of input data are discussed. The author analyzes results based on the method of computing ends of output polygonal chains. Additional methods to improve results are explored. The algorithm was tested on real-world cartographic data received from BDOT/GESUT databases, and on point clouds from laser scanning. An implementation for computing hatching of embankment is described.

Publisher

Commitee on Geodesy PAS

Date

2017.06.30

Type

Artykuły / Articles

Identifier

ISSN 2080-7636

DOI

10.1515/geocart-2017-0004

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