Integrated Campaign Registry (ICR) Implementation Guide
0.1.0 - ci-build International flag

Integrated Campaign Registry (ICR) Implementation Guide - Local Development build (v0.1.0) built by the FHIR (HL7® FHIR® Standard) Build Tools. See the Directory of published versions

CodeSystem: ICR Spatial Index Scheme

Official URL: https://icr.healthcampaigns.org/CodeSystem/icr-spatial-index-cs Version: 0.1.0
Draft as of 2026-09-06 Computable Name: ICRSpatialIndexCS

The tiling scheme a spatial-index cell belongs to. Each scheme has its own notion of level: quadkey zoom (1–23; the cell string is the zoom-length base-4 tile key, so a prefix is the containing tile at a coarser zoom), H3 resolution (0–15; the cell is the 15-hex-character index), geohash precision (the character count).

This Code system is referenced in the content logical definition of the following value sets:

This case-sensitive code system https://icr.healthcampaigns.org/CodeSystem/icr-spatial-index-cs defines the following codes:

CodeDisplayDefinition
quadkey Quadkey (XYZ tile key) Bing/XYZ tile quadkey: base-4 digits, one per zoom level from 1; the string length is the zoom; every prefix is the containing tile at that shorter zoom.
h3 H3 cell Uber H3 hexagonal cell index (15 hex characters); level = resolution 0–15. Not prefix-hierarchical as a string — join on exact cell.
geohash Geohash Base-32 geohash; level = precision (character count); prefixes are containing cells.