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ISPRS Int. J. Geo-Inf. 2017, 6(8), 232; doi:10.3390/ijgi6080232

Extrusion Approach Based on Non-Overlapping Footprints (EABNOF) for the Construction of Geometric Models and Topologies in 3D Cadasters

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1
Key Laboratory of Virtual Geographic Environment (Nanjing Normal University), Ministry of Education, Nanjing 210023, Jiangsu, China
2
College of Geographic Sciences, Nanjing Normal University, Nanjing 210023, Jiangsu, China
3
Jiangsu Center for Collaborative Innovation in Geographic Information Resource Development and Application, Nanjing 210023, Jiangsu, China
*
Author to whom correspondence should be addressed.
Received: 25 May 2017 / Revised: 14 July 2017 / Accepted: 2 August 2017 / Published: 3 August 2017

Abstract

Extrusion is widely used to construct models in 3D cadasters. However, the basic extrusion approach only supports relatively simple conditions, and a 3D cadastral data model that supports extruded 3D models that are associated with their corresponding footprints is not available. In this paper, we present a new extrusion approach based on non-overlapping footprints (EABNOF) that supports relatively complex 3D situations. In EABNOF, overlaps between overlapping footprints of the input data are removed, which also involves splitting extrusion intervals and handling the associated cadastral objects of footprints. The newly generated non-overlapping footprints are extruded to generate primitives. To construct geometric models and topologies for cadastral objects, three judgment criteria are proposed to identify and remove redundancies from these primitives, and then primitives of the same 3D spatial unit or topological feature are merged. Considering the feasibility of using EABNOF for current cadastral data, we design a data model that associates 3D cadastral data with the footprints of 2D cadasters. We examine two types of structures on Pozi Street to verify EABNOF: a building complex and property objects. The results demonstrate that EABNOF can construct geometric models and topologies in 3D cadasters. EABNOF is based on the footprints of 2D cadastral data, and thus is particularly suited to areas with 2D cadastral data to establish 3D cadasters with low costs. View Full-Text
Keywords: 3D cadaster; extrusion; geometric model; topology 3D cadaster; extrusion; geometric model; topology
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MDPI and ACS Style

Ding, Y.; Jiang, N.; Yu, Z.; Ma, B.; Shi, G.; Wu, C. Extrusion Approach Based on Non-Overlapping Footprints (EABNOF) for the Construction of Geometric Models and Topologies in 3D Cadasters. ISPRS Int. J. Geo-Inf. 2017, 6, 232.

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