# ADR-003 — GRB as Authoritative Reference Dataset

## Status
Accepted for V1 research and implementation planning.

## Context
The Basiskaart Vlaanderen / GRB is a professional Flemish geospatial reference dataset. GeoIntel is scoped to the Kempen, so Flemish official data is highly relevant.

## Decision
Treat GRB as the primary QA/QC reference where available. Use it for building/reference geometry validation and later for roads, water, and other base-map objects.

V1 integration strategy:

1. Implement a GRB provider abstraction.
2. Start with WFS or downloaded sample/cache depending on practical availability.
3. Normalize GRB features into a common `reference_features` model.
4. Compare AI detections against GRB with IoU/overlap metrics.

## Consequences
GeoIntel becomes more relevant to real Flemish GeoAI workflows than a generic OSM-only demo. GRB validation becomes a portfolio killer feature.

## Non-goals
Do not block the entire build on live GRB integration. Provide fixtures and provider interfaces first, then connect real GRB when endpoint details are tested.