Density Altitude Maps of Iran and Iraq
Abstract
This report provides maps of Iran and Iraq with contours of mean monthly density altitude at the surface near the times of maximum and minimum temperatures. Surface values of temperature, vapor pressure, and pressure used to calculate DA were adjusted at each grid point using gridded terrain elevation from the Defense Mapping Agency (DMA) 100-meter digital terrain database (DTED). Density altitude (DA) is pressure altitude (PA) corrected for nonstandard temperature and dew-pointed variations. PA is the altitude indicated by an altimeter when it is set to the standard datum plane of 29.92 inches of mercury. When conditions are standard, PA and DA are the same. If temperature is above standard, DA is higher than PA. If temperature is below standard, DA is lower than PA. DA can also be expressed as the altitude in the ICAO standard atmosphere at which a given density occurs. The maps produced in this study show the altitude in the ICAO standard atmosphere at which surface density occurs.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1991
- Accession Number
- ADA240485
Entities
People
- Walter F. Miller
Organizations
- Air Force Technical Applications Center