Summarise spatial interaction theory, drop the PC4 page, remove duplicate titles
Spatial Interaction Models is now a summary in our own words rather than a
near-verbatim reproduction of the Tinbergen discussion paper. It works through
the gravity model, Wilson's entropy-based family and Alonso's General Theory of
Movement, cites the original authors directly, and closes with what the theory
means in practice for accessibility work. The key point for this wiki is made
explicit: the balancing factors of a doubly constrained model are a potential
accessibility term and a competition correction. De Vries, Nijkamp & Rietveld
remain credited as the review followed, and References gains Wilson (1967),
Alonso (1978), Bikker (1987), Hua (1999) and Fotheringham & O'Kelly (1989).
GTFS and Public transport routing now link to the worked GeoDMS implementation
at geodms.nl/networkmodel_pbl/docs/create-routable-network-from-gtfs-files.html.
Removed the Dutch PC4 travel time matrix page. Its content is folded into
Applications in English, keeping both download links with their CC BY-SA 3.0 NL
terms, the method notes on NWB versus OSM, the hand-added Wadden ferry links,
junction penalties and BAG-weighted zone points, and the VPRO Nederland van
Boven link. The centroid figure moves to Zoning and spatial units with a caption
that matches what it actually shows.
Removed the leading H1 from all content pages, since GitHub renders the page
title from the filename and the heading appeared twice. Headings in Network
optimisation algorithm are demoted one level so its structure still nests.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Drop dashes, trim bold, add world and EU models, link to geodms.nl
Writing style: remove em and en dashes throughout, and reduce bold to the
places where it functions as a label rather than as emphasis.
Home: extend the scope table with the worldwide and European network models
alongside the PBL model, and reference all three from Applications, References
and the sidebar. Accessibility indicators and Network data sources now point at
the world model for settlement-rank measures and at the EU model for service
allocation.
Links: prefer geodms.nl over the GeoDMS GitHub wiki for network functions,
impedance, connect, connected_parts, service_area and the OD long to wide
example, and objectvision.nl for land use and the social domain.
Replace three dead links inherited from the old wiki: the PBL 2001 report now
resolves to the RIVM library PDF, and the Suriname project page and the nu.nl
article are gone, so those mentions keep their text without a hyperlink.
All 52 external URLs checked; all internal wiki links and images resolve.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Restructure wiki as a method reference for accessibility modelling
Position this wiki as the method/theory layer, distinct from the
objectvision.nl portfolio page, the project-specific networkmodel_pbl
documentation, and the GeoDMS software reference. Standardise on English.
Structure now follows the modelling chain: concepts, networks, origins and
destinations, computation, indicators, applications.
New pages with full content:
- Accessibility indicators: six indicator families with formulas, trade-offs
and a question-to-indicator selection table
- Travel impedance, Distance decay functions, Shortest path and the Dijkstra
algorithm, Network centrality (formulas moved out of Accessibility)
- Euclidean versus network distance, Zoning and spatial units,
Network data sources, Glossary, References
New pages as outlines, marked as such:
- Building a routable network, Travel speeds per mode, Connecting origins and
destinations to the network, Isochrones and catchment areas,
Public transport routing, GTFS
Existing pages:
- Home rewritten as a real table of contents with a scope table
- Accessibility rewritten around the Geurs & van Wee framework
- OSM and NWB translated to English; corrected the NWB claim that it contains
no cycle or foot paths (a separate cycle-path file is published)
- Applications rewritten with actual projects, replacing a dead link
- Titles and cross-references added to OD matrix, network optimisation and
spatial interaction models
Removed two orphaned Dutch MediaWiki leftovers whose content is now covered by
Euclidean versus network distance and Applications; both were unreachable from
any navigation and carried a broken image link.
All internal wiki links and image references verified to resolve.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Updated Network optimisation algorithm (markdown)
Updated Network optimisation algorithm (markdown)
Updated Network optimisation algorithm (markdown)
Updated Network optimisation algorithm (markdown)
Updated Network optimisation algorithm (markdown)
Updated Network optimisation algorithm (markdown)
Updated Network optimisation algorithm (markdown)
Updated Network optimisation algorithm (markdown)
Updated Network optimisation algorithm (markdown)
Updated Network optimisation algorithm (markdown)
Updated Network optimisation algorithm (markdown)
Updated Network optimisation algorithm (markdown)
Created Network optimisation algorithm (markdown)