USGS Global Fiducials: Long-Term Satellite Imagery of Environmental Sites

The Global Fiducials Library is a long-term archive of images from U.S. National Imagery Systems, representing a periodic record for selected scientifically important sites. The archive is managed by the U.S. Geological Survey under the National Civil Applications Program and has been collecting images of environmentally significant sites worldwide since the 1990s. The data is intended to support scientists and policy makers, with the goal of eventual open release.

Use Cases

• Monitor long-term environmental change based on periodic imagery of selected sites.
• Analyze land use and land cover dynamics for scientifically significant locations.
• Study geomorphic processes like erosion and sedimentation using time-series imagery.
• Support policy decisions with a long-term visual record of environmental sites.

Strengths

• Provides a long-term periodic record for selected sites, with collection starting in the 1990s.
• Managed by the U.S. Geological Survey under a formal federal program.
• Data is intended for eventual open release to support future scientists.

Limitations

• Row count and dataset size are unknown, which may limit suitability assessment.
• Column-level documentation is absent; field semantics must be inferred after download.
• Description metadata is limited; actual data quality requires manual inspection after download.

Provenance

Source

U.S. Geological Survey under the National Civil Applications Program, in partnership with the Civil Applications Committee.

Collection Method

Periodic collection of images from U.S. National Imagery Systems.

Time Range

Collection began in the 1990s.

Freshness

Last updated 2026-03-13 20:33:52.699189; freshness should be verified.

Geography

Environmentally significant sites around the world.