Modoc Plateau Vegetation Map with 81.6% Accuracy

A 2021 fine-scale vegetation and land use map covering approximately 855,998 acres in the Devil’s Garden and Adin Mountains eco-regions of Lassen and Modoc Counties, California. It was produced by CSU Chico's Geographical Information Center with CDFW's VegCAMP using 2018 one-meter NAIP imagery. Polygons were assessed for vegetation types, percent covers, clearing disturbance, and invasive plant cover.

Use Cases

• Classify vegetation types across 855,998 acres using polygon attributes like vegetation type and percent cover.
• Analyze the impact of clearing disturbance and invasive plant cover on different vegetation type polygons.
• Assess land use patterns by comparing standard vegetation polygons (1 acre MMU) to wetland/riparian areas (0.25 acre MMU).
• Validate mapping accuracy for specific vegetation types using the reported 81.6% overall fuzzy map accuracy and individual contingency tables.

Strengths

• High spatial detail from one-meter resolution 2018 NAIP imagery.
• Quantified overall fuzzy map accuracy of 81.6% with detailed contingency tables available.
• Covers a large, defined area of approximately 855,998 acres in two California counties.
• Follows established standards including the National Vegetation Mapping Classification and A Manual of California Vegetation.

Limitations

• Accuracy varies by individual vegetation type, requiring users to consult contingency tables for confidence in specific types.
• Temporal coverage is based on 2018 imagery, so conditions may have changed for more recent analysis.
• The dataset is specific to two eco-region subsections in California, limiting broader geographical applicability.

Provenance

Source

California State University, Chico's Geographical Information Center (GIC) and the California Department of Fish and Wildlife's Vegetation Classification and Mapping Program (VegCAMP).

Collection Method

Mapping produced using 2018 NAIP imagery, with polygons manually assessed for vegetation and land use attributes following specific classification standards.

Time Range

Imagery base from 2018; map finalized in 2021.

Freshness

The underlying imagery is from 2018; the map and reports were finalized in 2021.

Geography

Portions of the Modoc Plateau, specifically the Devil’s Garden and Adin Mountains eco-region subsections in Lassen and Modoc Counties, California, USA.