Abstract
Abstract. The requirement of the indoor navigation related tasks such emergency evacuation calls for efficient solutions for handling data sources. Therefore, the navigation grid extraction from existing floor plans draws attentions. To this, we have to thoroughly analyse the source data, such as Autocad dxf files. Then, we could establish a sounding navigation solution, which firstly complements the basic navigation rectangle boundaries, secondly subdivides these rectangles and finally generates accessible networks with these refined rectangles. Test files are introduced to validate the whole workflow and evaluate the solution performance. In conclusion, we have achieved the preliminary step of forming up accessible network from the navigation grids.
Highlights
Due to the urbanization process of our modern society, the indoor navigation becomes a key topic than ever, and the source data support for this subject draws researchers’ attention
The pre-processing here means the existing errors of the source file should be corrected, and we could utilize this information to further subdivide indoor space and extract the navigation information. These errors consist of the gap between lines, multi-break points for one line, and loss of semantic information in AutoCAD files
We have successfully proposed a complete solution to extract the accessible space information from the AutoCAD files
Summary
Due to the urbanization process of our modern society, the indoor navigation becomes a key topic than ever, and the source data support for this subject draws researchers’ attention. Each solution has its characteristic: hexagon shape has the best spatial utilization efficiency but suffers from moving direction statements; square shape has the disadvantage of unequal step length along octal directions; circle has the equal length from centre to boundary but with obvious gaps between units (Meulemans, van Renssen et al 2010, Zlatanova, Liu et al 2013, Krūminaitė and Zlatanova 2014). As another sounding choice, the extraction of variable size navigation grids from existing floor plans become an important approach. This paper is organized as follows: The second part describes the existing researches to extract grid networks from stored files; the third part elaborates the detail mechanism of the boundary processing; the forth part documents the accessible information extraction process; the fifth part demonstrates the experiment to validate the proposed method; the sixth part introduces a discussion of our solution by analysing the experiment result; the final part summarizes the pros and cons of our method
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