TerrAdapt:Cascadia Documentation
TerrAdapt:Cascadia
  • QUICK START GUIDE
  • HOW TO USE TERRADAPT:CASCADIA
    • Public License and Citation
    • Appropriate Uses and Key Limitations
    • TerrAdapt:Cascadia Map Portal
    • TerrAdapt:Cascadia Dashboard
  • 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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  1. DATA INPUTS

Topography, Hydrology, & Soils

PreviousEnergy and Transportation InfrastructureNextMethods Overview

Last updated 1 year ago

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TerrAdapt:Cascadia uses a variety of datasets pertaining to the physical environment, including data on topography, hydrology, and soils. Though these geophysical features change over geological timespans, for our purposes they are considered to be static.

The topographic and hydrological indices we use are all based on a digital elevation model (DEM) that represents the elevation at the surface of the earth. We use the 30m resolution DEM developed by the European Space Agency and hosted in the Google Earth Engine (GEE) data repository (see entry in the catalog ).

From the DEM, we calculate various topographic indices in GEE, including:

  • Slope

  • Aspect

  • Heat load index ()

  • Topographic position index (Weiss, 2001)

  • Height above nearest drainage ()

  • Horizontal and vertical terrain curvature (Florinsky 2016)

In addition to the above topographic indices, we calculate the following additional indices using :

  • Multiresolution valley bottom flatness

  • Topographic wetness index

  • Flow accumulation

  • Surface area

  • Texture

  • Ruggedness

  • Morphometric protection index

  • % clay content

  • % sand content

  • % silt content

  • bulk density

  • pH

  • Soil organic carbon

  • Soil order

Soil data used by TerrAdapt:Cascadia comes from , which developed a global 250m resolution soils dataset (we use version 2.0). From this dataset, we use the following variables, all calculated at a soil depth of 0-30 cm.

GLO-30
here
McCune and Keon, 2002
Nobre et al., 2011
SAGA GIS version 9.0
SoilGrids.org