Tracking Creatures of Bavarian Folklore Using a Least-Cost Path Model

Table of Contents

  1. Tracking Creatures of Bavarian Folklore Using a Least-Cost Path Model
  2. Setting up Your Workspace
  3. Preparing the Data
  4. Skill Drill: Geocoding an Address and Creating a CSV Table to Import As XY Data
  5. Skill Drill: Defining the Study Area
  6. Skill Drill: Acquire Elevation Data from the USGS National Map Viewer
  7. Skill Drill: Acquire Land Cover Data from the USGS National Map Viewer
  8. Skill Drill: Acquire Hydrography Data from the USGS National Map Viewer
  9. Changing Global Environment Settings for Raster Processing
  10. Creating Cost Surface Models Using a Relative Cost Scale
  11. Creating a Remap Table to Reclassify Elevation
  12. Skill Drill: Creating a Remap Table to Reclassify Slope
  13. Skill Drill: Creating a Remap Table to Reclassify Tree Canopy Density
  14. Converting the Hydrography Features to Cost Surface Models
  15. Creating a Total Cost Surface Model
  16. Creating a Cost-Distance Surface Model
  17. Creating a Migration Corridor
  18. Determining the Least-Cost Path
  19. Skill Drill: Creating a Map of the Results

Skill Drill: Creating a Remap Table to Reclassify Slope

Your next cost raster will be based on slope. The wolpertinger prefers to travel over steep slopes to avoid predators and to make use of tendency to fly short distances. Start by creating a slope raster, using degrees as the output measurement. Then use the following values to create a remap table to reclassify the slope raster.

  • A value of 1 for slopes greater the 35 degrees
  • A value of 2 for slopes between 30 to 35 degrees
  • A value of 4 for slopes between 25 to 30 degrees
  • A value of 6 for slopes between 20 to 25 degrees
  • A value of 8 for slopes between 10 to 20 degrees
  • A value of 9 for slopes between 5 to 10 degrees
  • A value of 10 for slopes between 0 to 5 degrees

Be sure your remap table captures the upper and lower values of the slope raster. In this example, the slopes range from 0 to 75.4372101 degrees.

An image of the slope layer added to ArcMap
In this image, a slope raster was created with values ranging from 0 degrees to just above 75 degrees. Your results should have a similar range.

Once the remap table has been created and saved as a CSV file, close Microsoft Excel and launch the Reclassify tool. Load the slope remap table using the same methods you used for reclassifying the digital elevation model.

An image of the reclassify tool

The slope layer has now been reclassified using the remap table. This layer now represents the relative cost or likelihood, on a scale of 1 through 10, that this species will traverse each pixel based on the steepness of the slope.

An image of the slope cost layer added to ArcMap
In this image, the ArcGIS software has assigned random colors to the pixel values between 1 and 10. Your results should look similar. Be sure there are no values beyond 1 through 10.