TerrAdapt:Cascadia

Covariates

The TerrAdapt:Cascadia landcover model uses a variety of covariates as environmental predictors of the landcover classes in our taxonomy. The data sources for these covariates are described in the DATA INPUTS section. All covariates were stored in Google Earth Engine (either in the public data catalog or TerrAdapt's private asset storage) and available for use in our dynamic workflow. The landcover model covariates are listed below under the following sections that correspond to the different data input sources.

Landsat

All Landsat covariates are derived from Landsat imagery processed to remove clouds and other artifacts and harmonized using the CCDC algorithm, as described in the Remote Sensing Data inputs section.

  • Raw band values (BLUE, GREEN, RED, NIR, SWIR1, SWIR2), July 1st

  • Landsat indices, July 1st

    • Normalized difference vegetation index (NDVI, Kreiger et al. 1969)

    • Normalized difference water index (NDWI, Gao 1996))

    • Leaf area index (LAI, Fang et al. 2019)

    • Normalized difference bare soil index (NDBSI, Liu at al. 2022)

    • Normalized difference snow index (NDSI)

    • Normalized burn ratio 2 (NBR2)

  • CCDC harmonic coefficients (1st, 2nd, and 3rd order sine and cosine), RMSE, phase, amplitude, and slope for the following bands and indices:

    • NIR band

    • Normalized burn ratio (NBR)

    • Tassled cap wetness index (TCW)

    • Enhanced vegetation index (EVI)

Topography

  • Slope

  • Topographic position index

  • Heat load index

  • Multi-resolution valley bottom flatness

  • Topographic wetness index

Climate

  • Climatic moisture deficit

  • Summer heat moisture index

  • Freezing degree days

  • Growing degree days

  • Number of frost-free days

  • Mean annual precipitation

  • Mean summer precipitation

  • Precipitation as snow

  • Mean annual temperature

  • Mean coldest month temperature

  • Mean warmest month temperature

  • Relative humidity

  • Temperature differential

Hydrology

  • Water occurrence

  • Distance to water

  • Height above nearest drainage

Soils

  • Soil density

  • Soil pH

  • Soil organic carbon

  • Sand fraction

  • Clay fraction

  • Silt fraction

  • Water capacity

Infrastructure

  • Distance to nearest major road (freeway, primary road, or secondary road)

  • Distance to nearest minor road (resource road, residential road)

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