Types and constructors for spatially referenced graphs.
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SpatialGraphs.jl introduces the AbstractSpatialGraph and other subtypes. The AbstractSpatialGraph
is a Graphs.AbstractGraph, and can be weighted or directed. SpatialGraphs.jl extends the
Graphs interface, so methods from Graphs.jl work right out of the box.
An AbstractSpatialGraph is a composite type that contains an AbstractGraph in addition to
metadata that details the spatial location of each vertex in the
graph. At this time, only raster-based graph types have been developed (and
vertex locations are stored in a Rasters.Raster), but there are plans to
implement graph types for vector data as well.