🌅📐🔭

#horizon #altitude measurement #sun angle #star angle #telescope sight #navigation instrument #angle finding

📏↑🌊

#height above sea level #elevation measurement #vertical distance #surveying #altitude measurement #topography

⛰️🧭📉

#altimeter #altitude measurement #atmospheric pressure #height gauge #aneroid barometer

📏↕️🌍

#vertical distance #sea level #altitude measurement #vertical scale #ground level #height above earth

📡➡️🌍⬅️📏

#radar principle #altitude measurement #radio altimeter #signal return #height above terrain #time of flight

✈️🛎️↕️

#aviation altimetry #aircraft altitude #flight level #barometric altimeter #altitude measurement #pressure altitude