Morpheo: python package and plugin QGIS for the characterization of spatial graphs.

References:

• Claire Lagesse's PhD thesis: https://halshs.archives-ouvertes.fr/tel-01245898

Requirements:

• QGIS 3.0 minimum
• GDAL/OGR tools
• spatialite 4.2 (Use mod_spatialite)

Install as command line:

python setup.py 

From this, Morpheo will be available as command line, i.e:

morpheo --help

Install as QGIS plugin

Copy or extract the morpheo python package (found in src/) in the .qgis/python/plugins folder of your home directory. This will add a Extension/Morpheo menu.

Note that if you are using the latest version from gitlab or github, you can add a symbolic link to the src/morpheo folder in your .qgis/python/plugins folder (on OSX and Linux)

What's computed

• Viary geometries as topological graph (arcs and vertices)
• Places
• Ways
• Orhogonality, topological radius, centrality indicators on edges and ways
• Horizon from mesh structures
• Shortest/simplest path
• Shortest/simplest path with topological shortcuts from mesh structures.
• Way simplest path (simplest path in way line graph)
• Structural differences

Outputs

By default, Morpheo creates a spatialite database and a folder name morpheo_<name_of_the_datasource> where all produced shapefiles and other moprpheo data are stored.

Graph indicators

Indicators computed on ways and arcs:

CONN             real, -- connectivity
CLOSEN           real, -- closeness
SPACING          real, -- spacing
ORTHOG           real, -- orthogonality
BETWEE           real, -- betweeness
USE              real, -- stress centrality
RTOPO            real, -- topological radius
ACCES            real, -- accessibility

Geographic features computed

These are the tables computed in the working database of morpheo: these table can be accessed in qgis for debug purpose.

• edges: edges of the topological graph computed from initial data
• vertices: vertices of the topological graph command from initial data
• places: places buffers computed, including external places definitions. These or vertices of edges in 'place_edges'
• place_zedges: edges beteween places. All indicators and path are computed using these edges.
• ways: computed ways from place_edges
• shortest: last shortest computed path
• simplest: last shortest computed path
• azimuth: last azimuthal path
• mesh_shortest: last computed shortest path using structural mesh as topological shortcut
• mesh_simplest: last computed simplest path using structucal mesh as topological shortcut
• way_simplest: last computed path on ways using the simplest path in the way's line graph.
• paired_edges: Computed invariants edges between two graphs (structural diff)