Constant-height surface

{
  "id": "MLC-T-MET-004620",
  "term": "Constant-height surface",
  "field": "Meteorology and atmospheric science",
  "definition": "A horizontal surface at a fixed geometric height above a reference datum such as mean sea level, on which temperature, wind or pressure is analyzed. It contrasts with a constant-pressure surface, whose height varies from place to place. Constant-height analysis is used mainly in boundary layer, radar and aviation work, for example a constant-altitude plan position indicator display, while synoptic upper-air charts use isobaric surfaces.",
  "synonyms": [
    "constant-level surface",
    "isohypsic surface"
  ],
  "see_also": [
    "constant-pressure surface"
  ],
  "url": "https://mlchart.com/terminology/meteorology/constant-height-surface/"
}