Comparisons between the RTNEPH (Real-Time Nephanalysis) and AFGL Cloud Layer Analysis Algorithms
Abstract
The Real-Time Nephanalysis (RTNEPH) is an automated cloud analysis model in operational use at the Air Force Global Weather Central (AFGWC). In the RTNEPH, polar-orbiting satellite imagery is analyzed in conjunction with conventional meteorological cloud observations to produce a global analysis of cloud attributes such as extent, height, bases, and type. In 1980, an alternative to the RTNEPH layer analysis algorithm was developed at the Air Force Geophysics Laboratory (AFGL). The AFGL algorithm performs a layer analysis using a 16 x 16 array of IR satellite pixels, four times larger than the RTNEPH array size. The AFGL cloud layer algorithm was proposed as an alternative to the current RTNEPH algorithm. This report describes the comparison study that was conducted on the AFGL and RTNEPH cloud layer algorithms and characterizes their differences in terms of the key meteorological parameters. The report contains recommendations for incorporating the AFGL algorithm into the RTNEPH and suggestions for future work in this area. (kt)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 15, 1989
- Accession Number
- ADA216637
Entities
People
- Crystal B. Schaaf
- Gary B. Gustafson
- James T. Bunting
- Michael K. Griffin
- Robert P. D'entremont
Organizations
- Air Force Systems Command