Digital Geologic-GIS Map of Tutuila, American Samoa at 1:63,000 Scale

A digital geologic-GIS dataset for Tutuila, American Samoa, completed as part of the National Park Service's Geologic Resources Inventory program. The data is derived from a University of Hawaii Cartographic Laboratory atlas map and a geology map after Stearns (1981). It is available in multiple GIS formats including a file geodatabase, geopackage, and shapefile, accompanied by PDF documentation.

Use Cases

• Conducting geologic hazard assessment based on mapped faults and geologic units.
• Creating derivative maps for land-use planning based on the digital geologic layers.
• Analyzing spatial relationships between geologic features like contacts and cross-sections.
• Integrating geologic data into broader environmental models for the National Park of American Samoa.

Strengths

• Data includes multiple standard GIS formats (file geodatabase, geopackage, shapefile) for broad compatibility.
• Provides ancillary documents with geologic unit descriptions and metadata FAQs for context.
• Horizontal locational accuracy is defined as within 32.0 meters based on the source map scale of 1:63,000.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect geographic and source bias inherent to the specific geologic maps used.

Provenance

Source

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

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 01:00:09.080777; freshness should be verified.

Geography

Tutuila, American Samoa.