Digital Geologic-GIS Map of Tau, American Samoa from the National Park Service

A digital geologic-GIS dataset for Tau, American Samoa, completed as part of the National Park Service's Geologic Resources Inventory program. The data includes GIS layers, tables, and ancillary documents, adapted from a University of Hawaii atlas map and a geology map after Stearns (1981). It is available in multiple GIS formats including a file geodatabase and an OGC geopackage.

Use Cases

• Conducting geologic unit analysis based on the provided geologic unit descriptions and ancillary map information.
• Creating geologic cross-sections based on the included geologic cross section lines.
• Mapping fault systems based on the faults data layer.
• Performing spatial analysis of geologic contacts and attitude observations using the GIS data layers.

Strengths

• Data is provided in multiple, widely-used GIS formats including an ESRI 10.1 file geodatabase and an OGC geopackage.
• Includes three supporting documentation files: a GIS readme, an ancillary map information document with unit descriptions, and a user-friendly FAQ metadata file.
• Source map scale of 1:56,000 provides a defined level of detail.

Limitations

• Description metadata is limited; actual data quality requires manual inspection after download.
• Column-level documentation is absent; field semantics must be inferred after download.
• Based on the source map scale, the locational accuracy of features is within 28.45 meters horizontally.

Provenance

Source

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

Collection Method

Completed as a component of the Geologic Resources Inventory (GRI) program.

Time Range

Source geology map is after Stearns (1981).

Freshness

Last updated 2026-03-04 00:59:33.069538; freshness should be verified.

Geography

Tau, American Samoa.