Space Syntax

For creating depthmap axial and segment analysis on maps.

Based on:

• osmnx for openstreat map downloading
• geopandas for conversion
• depthmapX for spatial analysis

Expected running time

The computations are CPU heavy and generally not multi-thread capable. For reference here are some orientational running times so that you can an idea on what kind of analysis timeline to expect:

City, Country	Time in seconds	Time in minutes	Time in hours	Time in Days
Balchik, Bulgaria	100	1,66666666666667	0,02777777777777	0,001157407407407
Alicante, Spain	2852	47,5333333333333	0,79222222222222	0,033009259259259
Wroclaw, Poland	16500	275	4,58333333333333	0,190972222222222
Medellin, Colombia	33660	561	9,35	0,389583333333333
Montreal, Canada	46265	771,083333333333	12,8513888888889	0,535474537037038
Hamburg, Germany	106140	1769	29,4833333333333	1,22847222222222
Berlin, Germany	165709	2761,81666666667	46,0302777777778	1,91792824074074
Tokyo, Japan	7898988	131649,8	2194,16333333333	91,4234722222222

• The analysis ran on a Intel(R) Core(TM) i7-6900K CPU @ 3.20GHz with 32GB of RAM

Operation steps as a state diagram

stateDiagram-v2
    DowloadMap : download map from OSM as an ESRI shapefile
    ConvertMap : convert the ESRI shapefile to DXF 
    DXFToGraph: transform DXF to a shape file GRAPH

    [*] --> DownloadAndTransform
    DownloadAndTransform --> AxialAnalysis
    DownloadAndTransform --> SegmentAnalysis

    state DownloadAndTransform {
        [*] --> DowloadMap
        DowloadMap --> ConvertMap
        ConvertMap --> DXFToGraph
        DXFToGraph --> [*]
    }
    state AxialAnalysis {
        ShapeToAxial: convert the shape file into an axial map
        AnalyseAxial: perform axial analysis
        AxialToMIF: export axial analysis to MIF
        AxialMIFTOSHAPE: transform the MIF to SHAPE
        AxialMIFTOGEOJSON: transform the MIF to GeoJSON
        
        [*] --> ShapeToAxial
        ShapeToAxial --> AnalyseAxial
        AnalyseAxial --> AxialToMIF
        AxialToMIF --> AxialMIFTOSHAPE
        AxialMIFTOSHAPE --> AxialMIFTOGEOJSON
        AxialMIFTOGEOJSON --> [*]
    }
    state SegmentAnalysis {
        ShapeToSegment: convert the shape file into a segment map
        AnalyseSegment: perform segment analysis
        SegmentToMIF: export segment analysis to MIF
        SegmentMIFTOSHAPE: transform the MIF to SHAPE
        SegmentMIFTOGEOJSON: transform the MIF to GeoJSON

        [*] --> ShapeToSegment
        ShapeToSegment --> AnalyseSegment
        AnalyseSegment --> SegmentToMIF
        SegmentToMIF --> SegmentMIFTOSHAPE
        SegmentMIFTOSHAPE --> SegmentMIFTOGEOJSON
        SegmentMIFTOGEOJSON --> [*]
    }

Loading

Algorithm pseudocode:

1. download map from OSM as an ESRI shapefile
2. convert the ESRI shapefile to DXF
3. transform DXF to a shape file GRAPH
4. convert the shape file into an axial map
   1. performing axial analysis
   2. exporting axial analysis to MIF
   3. transform the MIF to SHAPE
   4. transform the MIF to GeoJSON
5. convert the shape file into a segment map
   1. performing segment analysis
   2. exporting segment analysis to MIF
   3. transform the MIF to SHAPE
   4. transform the MIF to GeoJSON

License

GNU General Public License v3.0