| The scanning-receiver ceilometer has its separate light transmitter fixed to direct its beam vertically. |
| Our ceilometer observations of large numbers of birds near crests of ridges are particularly relevant in that regard. |
| One important use of the ceilometer is to determine cloud ceilings at airports. |
| Version 5.2 of the ceilometer algorithm has, in laboratory tests, almost eliminated false reports of this nature. |
| Changes in diurnal census data were associated with specific patterns of nocturnal migratory behavior observed by radar and ceilometer. |
| Ceilometer, device for measuring the height of cloud bases and overall cloud thickness. |
