D-analysis

{
  "id": "MLC-T-MET-010459",
  "term": "D-analysis",
  "field": "Meteorology and atmospheric science",
  "definition": "A method of meteorological analysis that focuses on the D-value, which is the difference between the actual altitude of a given pressure surface and the altitude of that same pressure surface in the ICAO Standard Atmosphere. Contours of constant D-values on a chart are equivalent to contours of geopotential height on a constant-pressure chart. This analysis technique was more common before the widespread use of direct geopotential height analysis.",
  "url": "https://mlchart.com/terminology/meteorology/d-analysis/"
}