Editing Transport network analysis (section)

===Service areas===
A network service area is analogous to a [[Buffer (GIS)|buffer]] in unconstrained space, a depiction of the area that can be reached from a point (typically a service facility) in less than a specified distance or other accumulated cost.<ref>{{cite book |last1=deSmith |first1=Michael J. |last2=Goodchild |first2=Michael F. |last3=Longley |first3=Paul A. |title=Geospatial Analysis: A Comprehensive Guide to Principles, Techniques, and Software Tools |date=2021 |edition=6th revised |chapter=7.4.3 Service areas | chapter-url=https://www.spatialanalysisonline.com/HTML/index.html?service_areas.htm}}</ref> For example, the preferred service area for a fire station would be the set of street segments it can reach in a small amount of time. When there are multiple facilities, each edge would be assigned to the nearest facility, producing a result analogous to a [[Voronoi diagram]].<ref>{{cite web |title=v.net.alloc command |url=https://grass.osgeo.org/grass78/manuals/v.net.alloc.html |website=GRASS GIS documentation |publisher=OSGEO |access-date=17 March 2021}}</ref>