Store | Contact Us | Careers
 
  • Home
  • Industries
  • Products
  • Training
  • Support
  • Services
  • Events
  • News
  • About
    • About Esri
    • Careers
    • Esri Video
    • Partners

Support

Search Support
You are here: > ArcScripts > Search Results > Script Details Login | Feedback | Help

Topographic Ruggedness Index



contact author | download help | report inappropriate content
Author Jeffrey Evans
File Name TRI.aml
Language AML
Last Modified Apr 22 2004
Status of work Public Domain
Software ArcInfo Workstation
File Size 6.86 kb
Downloads 3245

ArcScripts is intended for the free exchange of scripts and tools related to ESRI software products. Please alert the moderator if this script is a demo, trial-version, or an advertisement for a retail product.

Summary
The topographic ruggedness index (TRI) is a measurement developed by Riley, et al. (1999) to express the amount of elevation difference between adjacent cells of a digital elevation grid. The process essentially calculates the difference in elevation values from a center cell and the eight cells immediately surrounding it. Then it squares each of the eight elevation difference values to make them all positive and averages the squares. The topographic ruggedness index is then derived by taking the square root of this average, and corresponds to average elevation change between any point on a grid and it’s surrounding area.

Usage: TRI [DEM] [OUTGRID] {CLASSIFY}


References:
Riley, S. J., S. D. DeGloria and R. Elliot (1999). A terrain ruggedness index that quantifies topographic heterogeneity, Intermountain Journal of Sciences, vol. 5, No. 1-4,1999.

Blaszczynski, Jacek S., 1997. Landform characterization with Geographic Information Systems, Photogrammetric Enginnering and Remote Sensing, vol. 63, no. 2, February 1997, pp. 183-191.

10/21/02
Added an option to classify the results in accordance with Riley et. al. 1999.

Contact Us | Privacy | Legal | Site Map