A geologic map shows the spatial distribution of artificial-fill, alluvial, eolian, glacial deposits, and bedrock in and near Omaha, Nebraska and Iowa. Mapping was conducted in support of the USGS Omaha-Kansas City Geologic Mapping Project, using field observations from 1995-1996, aerial photography, and soil map interpretation. Surficial deposits are mapped where estimated to be at least 1 meter thick.
Use Cases
- Assess land suitability for construction based on mapped artificial-fill deposits.
- Identify potential sources of construction materials like concrete aggregate based on mapped sand and gravel deposits.
- Plan flood mitigation strategies based on the distribution of mapped alluvial deposits.
- Evaluate geological hazards by analyzing the spatial distribution of glacial deposits and bedrock.
Strengths
- Mapping is based on field observations in 1995 and 1996, aerial photography from multiple years, and soil map interpretation.
- Surficial deposits are mapped where estimated to be at least 1 meter thick, providing a consistent threshold.
- The map integrates data from multiple sources including previous mapping work and county soil maps.
Limitations
- Row count, file formats, and column-level documentation are unknown, which may limit suitability assessment.
- Last update date is unknown; freshness unverified.
- Small deposits and thin sheetwash alluvium were not mapped, potentially omitting local details.
Provenance
- Source
- CEOS_EXTRA via NASA Earthdata, likely originating from USGS mapping efforts.
- Collection Method
- Field observations, interpretation of aerial photography and soil maps, and modification of prior mapping.
- Time Range
- Field observations from 1995-1996; aerial photography from 1981, 1982, 1990, and 1993.
- Geography
- Greater Omaha Area, Nebraska and Iowa.