The Technology Behind Precision Post Code Mapping
Our methodology combines industry-leading GIS platforms, authoritative reference datasets, and rigorous quality assurance to produce post code data that government agencies can rely on.
Built on Proven Geographic Standards
NAVLOGICA's technology platform is built on the same geographic data standards used by national mapping agencies and public sector bodies across the UK. We work with authoritative reference datasets — Ordnance Survey MasterMap, Royal Mail PAF, and local authority boundary data — as the foundation for every project.
Our GIS processing pipeline handles data at scale: from raw address records and field survey data through to validated, attributed post code outputs. Every stage is logged, versioned, and auditable — meeting the traceability requirements of public sector data governance frameworks.
Tools, Platforms & Data Sources
Ordnance Survey MasterMap
The UK's most detailed and accurate large-scale mapping dataset, used as our primary geographic reference layer for all spatial processing.
Royal Mail PAF
The Postcode Address File — the definitive source of UK postal addresses — used for post code assignment validation and address matching.
ESRI ArcGIS Platform
Enterprise-grade spatial analysis and data management tools for geocoding, boundary analysis, and large-scale geographic data processing.
QGIS & Open Standards
Open-source GIS tools and OGC-compliant data formats ensure our outputs are compatible with any client GIS environment.
BS7666 Address Standard
All address data is structured to the British Standard for geographic referencing of information, ensuring interoperability with government systems.
INSPIRE Directive Compliance
Our spatial datasets comply with INSPIRE metadata standards, supporting cross-border data sharing and public sector interoperability requirements.
A Rigorous Five-Stage Methodology
Every NAVLOGICA project follows the same structured process — from initial data capture through to client delivery. This consistency is what makes our accuracy rates reproducible across projects of any scale.
Data Capture & Source Validation
Project scoping phaseWe begin by identifying and acquiring all relevant source data for the project area. This includes Ordnance Survey base mapping, existing address records, local authority boundary data, and any client-supplied datasets. Each source is assessed for currency, completeness, and authority before being admitted to the processing pipeline.
- Source data register
- Data quality assessment report
- Gap analysis and field survey plan
Spatial Processing & Geocoding
Core processing phaseRaw address and location data is processed through our GIS pipeline. Each record is geocoded — assigned precise geographic coordinates — and projected into the correct coordinate reference system (British National Grid, OSGB36). Address records are matched against OS MasterMap building polygons to establish spatial relationships.
- Geocoded address dataset
- Coordinate reference system documentation
- Spatial match rate report
Post Code Assignment
Assignment phaseEach geocoded address is assigned a post code using our validated assignment algorithm. The algorithm cross-references Royal Mail PAF sector boundaries, OS MasterMap building footprints, and local authority administrative boundaries to determine the correct post code for each address. Edge cases — addresses near sector boundaries or in new development areas — are flagged for manual review.
- Draft post code dataset
- Edge case register
- Sector boundary conflict log
Multi-Stage Quality Assurance
QA phaseEvery dataset undergoes three layers of quality assurance. Automated validation rules check for format compliance, geographic plausibility, and referential integrity. Statistical sampling identifies systematic errors. Manual review resolves flagged edge cases and verifies boundary assignments. All QA findings are documented in a structured audit trail.
- QA audit trail
- Accuracy rate certificate
- Exception report with resolutions
Delivery & Integration Support
Delivery phaseValidated datasets are delivered in the client's required format — GeoJSON, Shapefile, CSV, or direct database integration. We provide full metadata documentation, a data dictionary, and integration guidance. Post-delivery support is available for the first 30 days to assist with system integration and to address any queries arising from the data.
- Validated post code dataset
- Metadata and data dictionary
- Integration guide and 30-day support
Meeting Public Sector Data Requirements
Our data products are designed from the ground up to meet the standards required for public sector procurement and deployment. We maintain documented compliance with the key frameworks that govern geographic data in UK government.
British Standard for Geographic Referencing
All address data structured to the national standard for geographic referencing of information.
INSPIRE Directive Compliance
Spatial datasets comply with INSPIRE metadata standards for public sector interoperability.
Ordnance Survey Licensing
Licensed use of OS data products under Public Sector Mapping Agreement (PSMA) terms.
Data Protection Compliance
All data handling processes comply with UK GDPR and the Data Protection Act 2018.
Want to understand how this applies to your project?
Our team can walk you through the methodology in detail and explain how we would approach your specific data requirements.