Geologic GIS Map of Ofu and Olosega Islands, American Samoa

A Digital Geologic-GIS Map for Ofu and Olosega, American Samoa, produced by the National Park Service Geologic Resources Inventory program. The dataset includes GIS data layers, tables, and supporting documentation, adapted from source maps by the University of Hawaii and Stearns (1981). Data is available in multiple GIS formats, including a file geodatabase and OGC geopackage.

Use Cases

• Conducting geologic unit analysis based on the provided geologic unit descriptions.
• Creating geologic hazard assessments based on the mapped fault and contact data.
• Integrating geologic layers into broader environmental models for the National Park of American Samoa.
• Teaching or researching Pacific island geology using the digitized source map information.

Strengths

• Data is provided in multiple industry-standard GIS formats, including ESRI file geodatabase and OGC geopackage.
• Includes ancillary documents with geologic unit descriptions and metadata for context.
• Produced under the National Park Service's standardized Geologic Resources Inventory program.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Based on source map scales of 1:56,000, features have a stated locational accuracy within approximately 28.45 meters.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

National Park Service, Geologic Resources Division (GRD), adapted from University of Hawaii Cartographic Laboratory and Stearns (1981) source maps.

Collection Method

Digitized and compiled as part of the Geologic Resources Inventory (GRI) program.

Time Range

Source geology map is after Stearns (1981).

Freshness

Last updated 2026-03-04 00:58:45.089452; freshness should be verified.

Geography

Ofu and Olosega islands, American Samoa.