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Nadir also refers to the downward-facing viewing geometry of an orbiting satellite, [2] such as is employed during remote sensing of the atmosphere, as well as when an astronaut faces the Earth while performing a spacewalk. A nadir image is a satellite image or aerial photo of the Earth taken vertically.
Diagram showing the relationship between the zenith, the nadir, and different types of horizon. The zenith (UK: / ˈ z ɛ n ɪ θ /, US: / ˈ z iː n ɪ θ /) [1] [2] is the imaginary point on the celestial sphere directly "above" a particular location. "Above" means in the vertical direction opposite to the gravity direction at that location ...
Nadir Near infrared B3B VNIR_Band3B 0.760–0.860 15 Backward B4 SWIR_Band4 1.600–1.700 30 Nadir Short-wave infrared B5 SWIR_Band5 2.145–2.185 30 Nadir B6 SWIR_Band6 2.185–2.225 30 Nadir B7 SWIR_Band7 2.235–2.285 30 Nadir B8 SWIR_Band8 2.295–2.365 30 Nadir B9 SWIR_Band9 2.360–2.430 30 Nadir B10 TIR_Band10 8.125–8.475 90 Nadir
In topography, a nadir is a point on a surface that is lower in elevation than all points immediately adjacent to it. [1] Mathematically , a nadir is a local minimum of elevation. A nadir may be the lowest point of a dry basin or depression , or the deepest point of a body of water or ice .
The platform of the radar moves in direction of the x-axis. The radar "looks" with the looking angle θ (or so called off-nadir angle). The angle α between x-axis and the line of sight (LOS) is called cone angle, the angle φ between the x-axis and the projection of the line of sight to the (x; y)-plane is called azimuth angle.
The satellite will fly two radar antennas at either end of a 10 m (33 ft) mast, allowing it to measure the elevation of the surface across a 120 km (75 mi) wide swath. The new radar system is smaller than, but similar to, the one that flew on NASA's Shuttle Radar Topography Mission (SRTM), which made high-resolution measurements of Earth's land ...
Globalstar, Inc (NYSE:GSAT) stock is trading higher Tuesday as Apple Inc (NASDAQ:AAPL) showcased iOS 18 with satellite messaging during its annual developer event. Now, iPhone 14 and later users ...
In astronomy, the meridian is the great circle passing through the celestial poles, as well as the zenith and nadir of an observer's location. Consequently, it contains also the north and south points on the horizon, and it is perpendicular to the celestial equator and horizon.
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