OneMap Enterprise GIS Platform
Tier 1 — CriticalThe authoritative linear referencing system (LRS) and geospatial services layer for the agency. Nearly every location-aware application resolves routes and mileposts through OneMap services; also serves the public project viewer.
- Business Owner
- S. Delgado — Director of Planning
- Planning & Environmental
- Technical Owner
- H. Brandt — GIS Platform Architect
- Hosting
- Cloud (IaaS/PaaS)
- Azure Government, single region; portal + hosted feature services
- Platform / Vendor
- ESRI ArcGIS Enterprise on Azure Government
- Data Classification
- Public
- User Base
- ~1,700 internal users; services consumed by 9 SCDOT applications
Business Impact Assessment
Scored 1 (negligible) to 5 (severe) across the six impact categories from the Phase I BIA scope.
HPMS/ARNOLD submissions depend on the LRS; errors propagate to apportionment data.
Location referencing fails across dependent systems (ATMS, HMMS, RIMS, permits).
Single-region deployment; one regional Azure outage (7h) impacted services last year.
Recovery Objectives
Proposed via BIA- Minimum availability
- 99.5%
- Service window
- Business hours + 24×7 service availability for dependent systems
Workaround Feasibility
Cached basemaps and offline LRS extracts serve read-only needs; no editing or service-based geocoding during outage.
Dependencies
Systems, vendors, data feeds, infrastructure, and personnel this application depends on. Single points of failure are flagged.
| Dependency | Type | SPOF | Notes |
|---|---|---|---|
| Azure Government region (single) | Infrastructure | SPOF | No cross-region replica for hosted services |
| Road Inventory Management System | System | — | LRS route/milepost source of record |
| ESRI licensing portal | Vendor | — | — |
| Aerial imagery services | Data Feed | — | — |
Tier Assignment Traceability
Shared-dependency uplift (R5): five Tier 0/1 applications consume OneMap services; a Tier 2 raw score is uplifted to Tier 1.