Data, modelling and geomatics products

Data backbone

National climate and geospatial database

Central repository for climate, spatial, socio-economic and environmental data.

This database is the core storage and processing layer for vector data, raster data, time series, historical archives, reference datasets, field data and derived climate products.

National climate database Target architecture Cameroon PostgreSQL/PostGIS

• Storage of geospatial and non-geospatial data.
• Advanced spatial indexing and time-series management.
• Data catalogue, metadata and processing traceability.

GIS & Mapping

Climate risk maps and geospatial layers

Mapping hazards, exposed assets, vulnerabilities and risk areas.

Geomatics products make it possible to visualize areas exposed to floods, droughts, landslides, coastal erosion and other climate hazards with a territorial perspective by municipality, watershed or agro-ecological zone.

Geomatics and geospatial products Operational product Municipalities & watersheds GeoJSON · Shapefile · GeoTIFF

• Maps of fluvial and pluvial flood-prone areas.
• Vulnerability layers: population, buildings, roads, crops.
• Decision-support material for local authorities and technical services.

Satellite imagery

Satellite products for flood and vegetation monitoring

Sentinel-1, Sentinel-2, GPM, MODIS, Landsat and other Earth observation sources.

Satellite products feed flood detection, vegetation monitoring, land-cover analysis, surface parameter monitoring and generation of spatialized climate indicators.

Satellite and remote sensing products Continuous monitoring Pilot areas and national coverage 10 m Sentinel

• Sentinel-1 radar for flood extent detection.
• Sentinel-2 and MODIS for NDVI, VCI, NDWI and land cover.
• GPM, CHIRPS and local stations for rainfall data.

Predictive models

Hydrological, hydraulic and climate modelling

GR4H, HEC-RAS 2D, FFG, SWAT, SPI, SPEI, VCI and risk scenarios.

Models transform meteorological, hydrological and satellite data into decision-ready information: flood forecasts, vigilance levels, water stress, water availability and territorial exposure.

Climate and predictive modelling Phase 1+ Floods · Droughts 48–72 h forecast

• GR4H for watershed-scale hydrological forecasting.
• HEC-RAS 2D for detailed floodplain mapping.
• SPI/SPEI/VCI for drought monitoring.

Monitoring

Climate and risk monitoring dashboards

Visualization interfaces for experts, decision-makers, municipalities and partners.

Dashboards provide access to key indicators, alerts, maps, time series, locality summaries, data quality, processing performance and operational syntheses.

Climate dashboards Web portal National & local Real-time / periodic

• Monitoring of climate and geospatial indicators.
• Multi-scale view: national, regional, municipal, watershed.
• Visualization of alerts and vigilance levels.

IMS

Information Management System for spatial and non-spatial data

Integrated analysis of natural resources, ecosystems, social capital and socio-economic priorities.

The IMS aims to centralize, structure, secure and use spatial and non-geospatial data to analyze interactions between environment, natural resources, ecosystems, socio-economic priorities and drivers of change.

National climate database Integrated system ONACC · PNDP · PADI-DJA Cross-data analysis

• Inventory of available data and catalogue of sources.
• Quality control, consistency, security and metadata management.
• Analysis and visualization tools for public decision-making.

Product standard

Satellite imagery and metadata product catalogue

Organization by satellite, sensor, level, date, scene, format and associated files.

The data page prepares the future integration of standardized satellite products: raster images, metadata, browse images, thumbnails, RPC/RPB files, vector files and calibration information.

Satellite and remote sensing products Standardization Optical · Radar · Hyperspectral XML · TIFF · JPG · RPC · SHP

• Support for optical and radar products.
• Management of metadata, image, preview and RPC/RPB files.
• Preparation of a catalogue compatible with ONACC Engine processing chains.

API & dissemination

Web services for climate and mapping data dissemination

APIs, map services, product access, interoperability and technical documentation.

Web services will disseminate data, maps, alerts, models and derived products to web applications, mobile apps, institutional partners and external systems.

Web services for data dissemination Target architecture REST · GraphQL · OGC /api/v1/data

• Endpoints for data, alerts, models and mapping services.
• Caching and optimization for performance.
• Interactive documentation and access control.

Statistics

Climate statistical yearbook and time series

Organization of historical temperature, rainfall, index and anomaly series.

The climate statistical yearbook consolidates time series used for trend analysis, climate profiles, anomaly monitoring, seasonal assessments and indicator production for decision-makers.

Climate statistical yearbook Periodic product Stations · Municipalities · AEZ Long series

• Historical rainfall and temperature series.
• SPI, SPEI, NDVI, VCI and other climate indicators.
• Temporal and territorial comparison of anomalies.

Pilot study

Flood and drought risk monitoring using satellite imagery

Case of Blangoua, Makary, Tokombéré, Koza, Mora, Kousseri and Logone Birni.

The ONACC geomatics study combined satellite analysis, GIS, SPI/SPEI and field observations to identify areas vulnerable to flood and drought risks in seven Far North localities.

Geomatics and geospatial products 2023 Far North 7 localities

• Mapping of pluvial and fluvial floods.
• Analysis of agronomic and hydrological drought.
• Cross-analysis of hazards, vulnerabilities, crops, buildings and exposed populations.

Quality & performance

Data quality, availability and processing performance monitoring

Automated control of completeness, spatial consistency, latency and accuracy.

Technical monitoring tracks source availability, processing times, satellite image quality, station data completeness and model performance.

Climate dashboards Technical monitoring ONACC system >90% completeness

• Control of satellite image cloud cover.
• Detection of outliers and temporal consistency issues.
• Daily, weekly and monthly quality reports.