TerrAdapt:Cascadia Documentation
TerrAdapt:Cascadia
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  • HOW TO USE TERRADAPT:CASCADIA
    • Public License and Citation
    • Appropriate Uses and Key Limitations
    • TerrAdapt:Cascadia Map Portal
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  • DATA INPUTS
    • Data Inputs Overview
    • Remote Sensing Data
    • Climate
    • Energy and Transportation Infrastructure
    • Topography, Hydrology, & Soils
  • METHODS AND VALIDATION
    • Methods Overview
    • Landcover
      • Taxonomy
      • Training Data
      • Covariates
      • Model Development
      • Model Validation
    • Forest Structure
      • Training Data
      • Covariates
      • Model Development
      • Model Validation
    • Rangeland Fractional Cover
      • Training Data
      • Covariates
      • Model Development
      • Model Validation
    • Change Detection and Ecological Disturbance Modeling
      • Taxonomy
      • Covariates
      • Training Data
      • Model Development
    • Human Footprint
    • Habitat
      • Species Distribution Modeling
      • Ecosystem-based Models
      • Core Habitat
      • Habitat Centrality
    • Connectivity
      • Mapping Connectivity Networks
      • Corridors
      • Corridor Centrality
      • Mapping Barriers
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  • Landsat
  • Topography
  • Climate
  • Hydrology
  • Soils

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  1. METHODS AND VALIDATION
  2. Rangeland Fractional Cover

Covariates

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Last updated 9 months ago

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The TerrAdapt:Cascadia rangeland fractional cover models use a variety of covariates as environmental predictors. The data sources for these covariates are described in the 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 forest structure model covariates are listed below under the following sections that correspond to the different data input sources.

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 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, ))

    • Leaf area index (LAI, )

    • Normalized difference bare soil index (NDBSI, )

    • 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)

  • Slope

  • Topographic position index

  • Heat load index

  • Multi-resolution valley bottom flatness

  • Topographic wetness index

  • 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

  • Water occurrence

  • Distance to water

  • Height above nearest drainage

  • Soil density

  • Soil pH

  • Soil organic carbon

  • Sand fraction

  • Clay fraction

  • Silt fraction

  • Water capacity

DATA INPUTS
Landsat
Remote Sensing Data
Gao 1996
Fang et al. 2019
Liu at al. 2022
Topography
Climate
Hydrology
Soils