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PUBLICATION NOTICE: WorldIndex Database Update 2018

US Army Engineer Research and Development Center
Published July 31, 2019

The US Army Engineer Research and Development Center has published the report/note described and linked below. Approved for public release; distribution is unlimited.

Report Number:



WorldIndex Database Update 2018


Lynette A. Barna, Steven F. Daly, Kathleen F. Jones, and John J. Gagnon


The primary software program for designing and evaluating pavements on military installations is the Pavement-Transportation Computer Assisted Structural Engineering (PCASE) program. PCASE, which is undergoing an update to version PCASE7, is an engineering tool for the design and evaluation of airfields and roadways using Department of Defense criteria. The WorldIndex database is a necessary component of PCASE and is integrated into it. The WorldIndex database internally supplies PCASE with the climate parameters required to determine the maximum depth of frost penetration. The database contains other temperature-based parameters used in structural evaluations. This report documents a recent update to the WorldIndex database that uses historical surface air-temperature observations from 1980 to 2017 at over 10,000 locations around the globe. The database contains 80 air-temperature-based parameters determined for each station, including the three parameters that PCASE requires to compute the maximum depth of frost penetration for pavement design in cold regions: the average annual air temperature, the average freezing degree-days, and the mean length of the freezing season. The report concludes with recommendations for future updates.

55 pgs / 1.98 MB


ERDC is a diverse research organization with approximately 2,000 employees operating more than $1 billion in world class facilities at seven laboratories. Its annual program exceeds $1 billion as it supports the Department of Defense and other agencies in military and civilian projects. Principal research areas include Soldier support, Engineered Resilient Systems, Environmental Quality and Installations, Geospatial Research and Engineering, Military Engineering, and Water Resources.  “Discover ▪ Develop ▪ Deliver”

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