Ultramafic Substrates in the California Floristic Province, V1 2026
by Ryan O'Dell·Updated 19d ago
179.4 MB1files
Available on 1 platform
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Description
A continuous, fine-scale geodatabase of ultramafic substrates created to support plant species distribution modeling. The dataset covers the entire California Floristic Province, including California and southwestern Oregon, with a minimum mapping unit of 4,000 m² and an accuracy of ±20 meters. Author Ryan O'Dell produced this version in 2026, aiming to improve upon the accuracy of existing geologic and soil survey maps.
Use Cases
Modeling species distribution for ultramafic endemic plants based on substrate boundaries.
Identifying conservation areas for rare plant taxa based on mapped ultramafic masses, landslides, and alluvial deposits.
Comparing substrate mapping accuracy against older sources like the Geologic Map of California or gSSURGO data.
Strengths
Designed for high accuracy (±20 m) and fine scale (4,000 m² MMU), addressing gaps in prior maps.
Covers the entire California Floristic Province, a continuous area including California and southwestern Oregon.
Explicitly maps ultramafic landslides, alluvial deposits, and glacial till, which were previously missing or mislabeled.
Limitations
Column-level documentation is absent; field semantics must be inferred after download.
Row count is unknown, which may limit suitability assessment.
The dataset is version 1, with a second stage planned for 2026-2030 to add attributes like soil series and rock type.
Provenance
Source
Compiled from the National Geologic Map Database (NGMDB) and the Gridded Soil Survey Geographic Database (gSSURGO).
Collection Method
Polygons were delineated manually using high-resolution satellite imagery to improve boundary accuracy.
Time Range
Data compilation period 2020–2026.
Freshness
Last updated 2026-05-17 21:15:36; freshness should be verified.
Geography
California Floristic Province (California and southwestern Oregon).
Data is provided as a 179.4 MB ZIP file; a GIS application is required to use it.