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NetworkModel_EU is a spatial modelling framework for analysing access to services across European countries. It combines road-network travel-time computation in GeoDMS with facility-location optimisation in Julia, to answer where a service network's facilities should be and how far today's network is from that.

The model is developed by Object Vision b.v. as part of the CRISP-EU project for JRC.

Two lines of work

	Branch	Question	Pages
Pharmacies (current, September 2026)	ServiceAccess	By how much could accessibility improve at equal cost, or cost fall at equal accessibility? A facility-location LP on the road OD, swept over the price of a location, gives a Pareto frontier of number of locations vs population travel, with today's network placed on it — for 42 study areas.	Pharmacy service access · Lambda sweep method · Pharmacy results September 2026
Schools (2025–early 2026)	—	Which schools to keep open, balancing travel against scale inefficiency (under-enrolment)?	Service allocation procedure

How it works

1. OD matrix — GeoDMS builds the road network from the TomTom extract and computes travel times between populated 1 km² grid cells and candidate facility locations, exporting the results as Arrow files.
2. Facility location — Julia (JuMP + HiGHS) reads those files and solves which facilities to open, and how clients are assigned, under the chosen objective.
3. Back to GeoDMS — the open/closed decisions are read back for mapping and accessibility indicators on the 1 km grid.

Pages

• Pharmacy service access — the ServiceAccess branch: components, data flow, how to run it
• Lambda sweep method — the model, the λ-sweep, the rounding, the scenarios, the scope rules
• Pharmacy results September 2026 — headline results from the results deck
• Service allocation procedure — the school-era formulation and solvers
• Installation of Julia — how to install Julia and the required packages

The repository's README on the ServiceAccess branch carries the same material next to the code.