bettergovph/project-noah-hazard-maps

Project NOAH Hazard Maps

Dataset Summary

The Project NOAH (Nationwide Operational Assessment of Hazards) Hazard Maps is a comprehensive collection of geospatial datasets covering natural hazard assessments across the Philippines. The dataset includes three major hazard types:

1. Flood Hazard Maps - Flood inundation maps for 5-year, 25-year, and 100-year rainfall return periods
2. Landslide Hazard Maps - Shallow landslide susceptibility, structurally-controlled landslide hazards, and debris flow/alluvial fan delineations
3. Storm Surge Hazard Maps - Storm surge advisory maps for four severity levels based on simulations of 721 historical tropical cyclones (1951-2013)

The dataset covers all 81 provinces of the Philippines with province-level granularity, totaling approximately 23GB of geospatial data in ESRI Shapefile format.

Languages

The dataset documentation and metadata are in English. Geographic feature names are in Filipino and English.

Dataset Structure

Data Instances

The dataset is organized into three main directories:

project-noah-downloads/
├── Flood/
│   ├── 5yr/           # 5-year return period flood maps
│   ├── 25yr/          # 25-year return period flood maps
│   ├── 100yr/         # 100-year return period flood maps
│   └── metadata_flood.txt
├── Landslide/
│   ├── LandslideHazards/      # Merged landslide hazard maps
│   ├── DebrisFlowAlluvialFan/ # Debris flow and alluvial fan maps
│   └── metadata_landslide.txt
├── Storm Surge/
│   ├── StormSurgeAdvisory1/   # SSA 1 (2.01m to 3m)
│   ├── StormSurgeAdvisory2/   # SSA 2 (3.01m to 4m)
│   ├── StormSurgeAdvisory3/   # SSA 3 (4.01m to 5m)
│   ├── StormSurgeAdvisory4/   # SSA 4 (>5m)
│   └── metadata_stormsurge.txt
└── NOAH_License.pdf

Each province is provided as a separate ZIP archive containing ESRI Shapefiles (.shp, .shx, .dbf, .prj, etc.).

Example shapefile attributes for flood hazard:

{
  "Var": 3,
  "geometry": "POLYGON ((121.0 14.5, 121.1 14.5, ...))"
}

Data Fields

Flood Hazard Maps

• Var: Hazard classification indicator (Integer)
  • 1: Low hazard (0-0.5 meters flood depth)
  • 2: Medium hazard (>0.5-1.5 meters flood depth)
  • 3: High hazard (>1.5 meters flood depth)

Hazard levels consider both flood depth and velocity. Areas with shallow but fast-flowing water may have higher hazard levels than depth alone would indicate.

Landslide Hazard Maps

• HAZ: Hazard classification indicator (Integer)
  • 1: Low hazard - Build only with continuous monitoring
  • 2: Medium hazard - Build only with slope protection and intervention; continuous monitoring
  • 3: High hazard - No dwelling zone

Storm Surge Hazard Maps

• HAZ: Hazard classification indicator (Integer)
  • 1: Low hazard (0.2m < max depth < 0.5m, and 0 < max depth × velocity < 0.5 sq.m/s)
  • 2: Medium hazard (0.5m < max depth < 1.5m, or 0.5 < max depth × velocity < 1.5 sq.m/s)
  • 3: High hazard (max depth > 1.5m, or max depth × velocity > 1.5 sq.m/s)

Storm Surge Advisory (SSA) levels correspond to peak storm tide heights:

• SSA 1: 2.01m to 3m
• SSA 2: 3.01m to 4m
• SSA 3: 4.01m to 5m
• SSA 4: More than 5m

Data Splits

The dataset is organized by hazard type and scenario rather than traditional train/validation/test splits:

Hazard Type	Scenarios	Provinces	Description
Flood	3 (5yr, 25yr, 100yr)	80	Return period-based flood maps
Landslide	2 (Hazards, Debris Flow)	82	Susceptibility and runout maps
Storm Surge	4 (SSA 1-4)	68	Advisory level-based inundation maps

Dataset Creation

Source Data

This data was sourced from the downloadable products of Project NOAH.

Annotations

Personal and Sensitive Information

This dataset does not contain personal or sensitive information. It consists entirely of geospatial hazard zone delineations at the provincial and municipal level.

Additional Information

Licensing Information

The downloadable products of Project NOAH hosted in this server are open data licensed under the Open Data Commons Open Database License (ODC-ODbL). The full details of the license can be found here: https://opendatacommons.org/licenses/odbl/1.0/.

You are free to download, copy, transmit, redistribute, and adapt our data provided that Project NOAH and its contributors are always properly attributed. Please refer to the accompanying readme file for citations and references on how to use the data.

If you alter or build upon our data, you may only distribute the result under the same license (ODC-ODbL).