Abstract
Abstract. Recent years has seen an increase in the work done on indoor data mapping and modeling. The standard data models provide different ways to store and access the indoor data but the way it is done is specific to the domain in which they are used. Although models like IFC, CityGML and IndoorGML provides rich functionality, the widespread availability of indoor data is not in these formats. This paper presents a step by step methodology to convert indoor building data of existing buildings, represented in architectural drawings into a topologically consistent and semantically rich indoor spatial model. The workflow presented consists of extracting relevant geometric entities from CAD drawings, assessing their topological relationships, using it to derive semantic information of spaces and making the data available in the form of IndoorGML. Since the current IndoorGML features lack the capability to store relevant semantic information, a semantic extension to IndoorGML is also proposed. The extraction of primitive spatial elements in rectilinear buildings like walls and doors are considered for the work presented in this paper. Development of a toolkit which implements this methodology in a seamless manner is work in progress and would incorporate extraction of complex spatial elements like staircases, ramps, curvilinear walls and windows, which is out of scope of the current work presented in this paper.
Highlights
Today’s commercial CAD software is the product of years of research that began in the 1960’s and 1970’s
CAD drawings capture a rich amount of indoor information of a building using a representational standard which is in the form of primitive geometric elements like points, lines and arcs
This paper presents a workflow which focuses on extracting the relevant geometric entities from CAD drawings, assessing their topological relationships, using it to derive semantic information of spaces and making the data available in the form of IndoorGML
Summary
Today’s commercial CAD software is the product of years of research that began in the 1960’s and 1970’s. One of the primary purpose of CAD architectural plans is for designing and drafting the elements of a building using a representational standard symbology. In general these representational standards are visual in nature and are meant to be interpreted manually by professionals (Cherneff et al, 1992). CAD drawings capture a rich amount of indoor information of a building using a representational standard which is in the form of primitive geometric elements like points, lines and arcs. A need for digital interpretation process to effectively capture the components of the building is necessary
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