Home / Neighborhood Graph / Neighborhood Graph Specification
NeighborhoodGraph
Where Places Become Interactive.
NeighborhoodGraph is an AGPL-3.0+ open-source platform for housing intelligence, ownership transparency, digital twins, infrastructure analysis, community memory preservation, cooperative housing management, and AI-powered community intelligence.
The platform combines property intelligence, GIS mapping, ownership research, infrastructure visualization, digital twin technology, citizen reporting, historical preservation, and artificial intelligence into a unified community knowledge ecosystem.
Vision
NeighborhoodGraph seeks to create an open, transparent, and community-focused platform that helps citizens, researchers, planners, housing advocates, municipalities, and developers better understand the places where people live.
The platform is designed to transform disconnected public records, maps, imagery, infrastructure data, and community knowledge into interactive experiences and actionable insights.
Core Features
Core Architecture Module
Platform Framework
- Modular architecture
- Plugin ecosystem
- Event-driven architecture
- Multi-tenant deployments
- Federated deployments
- REST API
- GraphQL API
- SDK support
- Extension framework
- Open governance framework
Property Intelligence Module
Property Analysis
- Open-source AVM
- Fair market value estimation
- Comparable sales analysis
- Property scoring
- Historical valuation tracking
- Appreciation forecasting
- Depreciation analysis
Property History
- Ownership history
- Deed history
- Mortgage history
- Lien tracking
- Tax assessment history
- Permit history
- Property timelines
Property Condition Intelligence
- Code enforcement tracking
- Permit monitoring
- Environmental risk analysis
- Flood risk analysis
- Disaster impact history
Ownership Intelligence Module
Ownership Transparency
- Owner identification
- LLC ownership detection
- Corporate ownership analysis
- Beneficial ownership research
- Ownership relationship graphs
- Ownership network visualization
Ownership Concentration
- Investor concentration maps
- REIT monitoring
- Institutional ownership tracking
- Neighborhood ownership reports
- Market concentration analysis
Portfolio Intelligence
- Multi-property portfolio tracking
- Acquisition monitoring
- Bulk purchase detection
- Ownership clustering
- Portfolio growth monitoring
Neighborhood Intelligence Module
Community Health
- Community Impact Score
- Neighborhood Stability Score
- Owner occupancy analysis
- Housing affordability metrics
- Community retention metrics
Neighborhood Trends
- Appreciation heatmaps
- Vacancy analysis
- Housing turnover analysis
- Rental growth tracking
- Development activity tracking
Community Risk Indicators
- Gentrification indicators
- Displacement risk scoring
- Housing stress analysis
- Vulnerability analysis
Investor Activity Intelligence Module
Acquisition Intelligence
- Institutional acquisition monitoring
- REIT acquisition monitoring
- Corporate acquisition tracking
- Bulk acquisition detection
Flipping Intelligence
- Flip detection
- Flip profitability analysis
- Rapid resale monitoring
- Neighborhood flip heatmaps
Market Activity Analysis
- Transaction velocity analysis
- Price anomaly detection
- Ownership turnover monitoring
- Market acceleration indicators
Housing Affordability Intelligence Module
Affordability Monitoring
- Median home price analysis
- Rent tracking
- Price-to-income ratios
- Housing burden analysis
Rental Intelligence
- Rental forecasting
- Vacancy-adjusted rent analysis
- Institutional rental concentration tracking
Community Preservation
- Affordability decline alerts
- Housing accessibility forecasts
- Preservation indicators
Neighborhood Visualizer AI Module
Photo-to-3D Engine
- MLS photo reconstruction
- Smartphone photo reconstruction
- Historical photo reconstruction
- Interior model generation
- Exterior model generation
Video-to-3D Engine
- Walkthrough reconstruction
- Drone footage reconstruction
- Mobile video reconstruction
- 360-degree reconstruction
Satellite-to-3D Engine
- Satellite imagery reconstruction
- Aerial imagery reconstruction
- Terrain generation
- Parcel reconstruction
Street Reconstruction Engine
- Sidewalk generation
- Road reconstruction
- Utility visualization
- Vegetation reconstruction
Digital Twin Generator
- Property digital twins
- Street digital twins
- Neighborhood digital twins
- Municipal digital twins
- County digital twins
- Regional digital twins
AI Walkthrough System
- First-person exploration
- Virtual home tours
- Interactive navigation
- Accessibility-friendly navigation
Historical Reconstruction
- Historic building recreation
- Historic neighborhood recreation
- Historic downtown reconstruction
- Time-based comparisons
Future Projection Engine
- Development simulations
- Zoning simulations
- Infrastructure simulations
- Climate impact visualizations
Community Visualization Layer
- Ownership overlays
- Investor overlays
- Infrastructure overlays
- Vacancy overlays
- Affordability overlays
Change Detection AI
- New construction detection
- Demolition detection
- Renovation detection
- Land-use change detection
Infrastructure Intelligence Module
Water Intelligence
- Water main mapping
- Water capacity analysis
- Service area mapping
- Reliability analysis
Sewer Intelligence
- Sewer network mapping
- Capacity forecasting
- Overflow monitoring
- Infrastructure risk analysis
Electrical Intelligence
- Grid mapping
- Substation visualization
- Reliability monitoring
- Renewable integration analysis
Broadband Intelligence
- Fiber mapping
- Broadband availability tracking
- Digital divide analysis
Transportation Intelligence
- Road network analysis
- Transit accessibility scoring
- Walkability analysis
- Bicycle infrastructure analysis
Infrastructure Planning
- Capital project visualization
- Capacity forecasting
- Infrastructure investment analysis
Utility Digital Twin Module
Water System Digital Twins
- Distribution network models
- Storage facility models
- Capacity monitoring
- Resilience analysis
Sewer System Digital Twins
- Wastewater system visualization
- Flow modeling
- Risk modeling
- Maintenance forecasting
Electrical Grid Digital Twins
- Grid visualization
- Energy flow analysis
- Capacity forecasting
- Outage analysis
Broadband Digital Twins
- Fiber network visualization
- Connectivity analysis
- Expansion planning
- Coverage forecasting
Citizen Reporting Module
Community Reporting
- Property condition reports
- Vacancy reports
- Blight reports
- Infrastructure issue reports
- Neighborhood observation reports
Development Monitoring
- Construction reports
- Demolition reports
- Permit observations
- Development tracking
Evidence Collection
- Photo uploads
- Video uploads
- Drone imagery uploads
- Geospatial reporting
Verification System
- Community review
- Evidence validation
- Reputation scoring
- Audit logging
NeighborhoodGraph AI Assistant Module
Natural Language Interface
- Property analysis queries
- Ownership analysis queries
- Neighborhood analysis queries
- Infrastructure analysis queries
Investigation Assistant
- Ownership investigations
- Portfolio discovery
- Acquisition analysis
- Historical ownership tracking
Market Intelligence Assistant
- Housing trend analysis
- Investor activity analysis
- Community impact analysis
Research Assistant
- Report generation
- Data discovery
- Guided investigations
- Conversational analytics
Land Intelligence Module
Vacant Land Intelligence
- Vacant parcel identification
- Buildability analysis
- Development readiness scoring
Development Opportunity Analysis
- Residential opportunities
- Commercial opportunities
- Mixed-use opportunities
- Infill development analysis
Agricultural Land Intelligence
- Agricultural parcel tracking
- Land conversion monitoring
- Farmland preservation analysis
Public Land Intelligence
- Federal property inventory
- State property inventory
- County property inventory
- Municipal property inventory
Land Market Intelligence
- Land acquisition tracking
- Speculation monitoring
- Land value forecasting
Environmental Land Analysis
- Wetland mapping
- Floodplain analysis
- Forest monitoring
- Climate resilience analysis
Community Memory Module
Oral History Archive
- Resident interviews
- Community stories
- Historical recordings
- Local culture preservation
Historical Media Library
- Historical photographs
- Historical videos
- Historical maps
- Newspaper archives
Historical Knowledge Graph
- Historic ownership relationships
- Historic business relationships
- Community evolution timelines
Historical Reconstruction AI
- Historic digital twins
- Lost landmark reconstruction
- Community change playback
- Interactive timeline navigation
Open Building Repository Module
Open Building Library
- Open floor plans
- Open construction plans
- Historic building plans
- Public-domain building designs
Building Intelligence
- Design analysis
- Cost estimation
- Sustainability analysis
- Accessibility evaluations
Community Design Library
- Affordable housing designs
- Cooperative housing designs
- ADU libraries
- Resilient housing designs
Housing Cooperative Module
Cooperative Management
- Membership management
- Governance tools
- Meeting management
- Voting systems
Financial Management
- Budgeting
- Reserve fund tracking
- Financial reporting
Community Land Trust Support
- Property inventory management
- Stewardship monitoring
- Affordability preservation tracking
Shared Ownership Systems
- Cooperative ownership
- Shared equity ownership
- Community land trust ownership
GIS and Mapping Module
Mapping Platform
- Parcel mapping
- Ownership mapping
- Infrastructure mapping
- Community health mapping
Spatial Analysis
- Transit accessibility
- School accessibility
- Infrastructure accessibility
- Environmental risk mapping
Government Intelligence Module
Government Dashboards
- Municipal dashboards
- County dashboards
- State dashboards
Investigation Support
- Fraud indicators
- Ownership concentration reports
- Market activity alerts
Policy Analysis
- Housing policy simulations
- Zoning impact analysis
- Development forecasting
Research and Transparency Module
Open Data Platform
- Open datasets
- Open APIs
- Historical archives
- Research exports
Research Tools
- Ownership explorer
- Transaction explorer
- Neighborhood explorer
- Community impact explorer
Reporting Engine
- Automated reports
- Neighborhood reports
- Investor reports
- Municipal reports
Citizen Portal Module
Homebuyers
- Property valuation tools
- Neighborhood research tools
- Ownership history lookup
Renters
- Rent trend analysis
- Landlord ownership lookup
- Property history reports
Community Organizations
- Community monitoring dashboards
- Housing preservation tools
- Community impact reporting
NeighborhoodGraph Marketplace Module
Extension Marketplace
- Analytics plugins
- AI plugins
- GIS plugins
- Visualization plugins
- Reporting plugins
AI Marketplace
- Valuation models
- Forecasting models
- Change detection models
- Community analysis models
Data Marketplace
- Housing datasets
- Ownership datasets
- Infrastructure datasets
- Environmental datasets
Community Marketplace
- Shared dashboards
- Shared visualizations
- Shared workflows
- Shared investigation tools
Developer Ecosystem
- SDKs
- Plugin development tools
- Extension documentation
- Community governance
Future Expansion Modules
- Urban Simulation Engine
- Community Services Intelligence
- Disaster Intelligence
- Open MLS Replacement
- Construction Intelligence
- Zoning Intelligence
- Climate Intelligence
- National Property Knowledge Graph
- National Housing Digital Twin
- NeighborhoodGraph Academy
Specification Branding License (SBL)
Standard
- Fully AGPL-3.0+ compliant system
- Copyleft enforced for network deployments
- Required attribution:
- Roxanne Ardary
- https://www.roxanneardary.com/
Optional
- Specification Branding License (SBL)
- Attribution-free commercial deployment
- Pricing based on scale, usage, and deployment scope
- https://roxanneardary.com/neighborhood-graph/
License & Notice Requirements
NeighborhoodGraph is released under the GNU Affero General Public License v3.0 or later (AGPL-3.0+).
By contributing to this project, you agree that your contributions will also be released under this license.
Please note the following:
- All contributions must comply with the AGPL-3.0+ terms.
- Under Section 7 of the license, all redistributions, forks, and derivative works must preserve attribution to:
Roxanne Ardary and roxanneardary.com. - NeighborhoodGraph specificiations are free to use with attribution. A Specification Branding License can be negotiated upon request.
- The project’s notice.md file tracks attribution requirements and contributor acknowledgments. Any update that adds new contributors or modifies attribution should also update
notice.md. - When submitting a pull request, ensure that any new files maintain the attribution headers where applicable.
- Network-deployed versions of this software must also remain fully AGPL-3.0+ compliant, including exposure of source code modifications when applicable under the license.
For full legal details, please refer to the AGPL-3.0+ license and the project’s notice.md file.
Notice – NeighborhoodGraph
Attribution Requirement: Under Section 7 of the AGPL 3.0+ license, all redistributions, forks, and derivative works, including network-deployed versions of this project, must provide attribution to Roxanne Ardary and roxanneardary.com.
Contributors
This file tracks contributors and their specific contributions to the project.
- Roxanne Ardary, roxanneardary.com – June 8, 2026
Created the repository for NeighborhoodGraph and designed the open-source platform architecture for housing intelligence, ownership transparency, digital twins, infrastructure analysis, community memory preservation, cooperative housing management, and community intelligence. - [Add other contributors here] – [Date]
[Describe contribution in one sentence]
License – NeighborhoodGraph
This repository is licensed under the GNU Affero General Public License v3.0 or later (AGPL-3.0+).
Key Points:
- You are free to use, modify, and distribute the code.
- All redistributions, forks, and derivative works or network-deployed versions must also be licensed under AGPL-3.0+ and provide attribution to Roxanne Ardary and roxanneardary.com as required under Section 7 of the license.
- The software is provided “as is,” without warranty of any kind.
For the full license text, see GNU AGPL-3.0 License: https://www.gnu.org/licenses/agpl-3.0.html