Cloud-free line of sight

{
  "id": "MLC-T-MET-004454",
  "term": "Cloud-free line of sight",
  "field": "Meteorology and atmospheric science",
  "definition": "An unobstructed path through the atmosphere from an observer to a target, without any intervening clouds. This condition is necessary for many optical remote sensing applications, astronomical observations, and aviation operations. The probability of a cloud-free line of sight varies significantly with geographic location, season, and time of day.",
  "abbreviation": "CFLOS",
  "see_also": [
    "clear line of sight"
  ],
  "url": "https://mlchart.com/terminology/meteorology/cloud-free-line-of-sight/"
}