nadir
See Also: celestial sphere, meridian, zenith
[aerial photography] In aerial photography, the point on the ground vertically beneath the perspective center of the camera lens.
nadir
the point of the celestial sphere that is directly opposite the zenith and vertically downward from the observer
NAS ...
nadir
In aerial photography, the point on the ground vertically beneath the perspective center of the camera lens.
Nadiri, M.I. (1970), "International Studies of Factor Inputs and Total Factor Productivity: A Brief Survey," Review of Income and Wealth 18:129-48.
The nadir is the opposite point (or rather, direction), where the direction of gravity extended downward intersects the (invisible) celestial sphere.
The celestial horizon is a plane perpendicular to a point's gravity vector.
Because of its off-nadir sensor pointing capability, ASTER can collect the stereo pairs necessary to generate high resolution DEMS (using bands 3N and 3B).
1 km2 at nadir to 12.6 km2 at the end of the scan line. The sensor scans throuah 110.8° as it examines the earth, producing a scanline of 2.925 km. This wide scan angle, + 54° of nadir, permits daily views of the earth.
The SRTM swaths extended from about 30 degrees off-nadir to about 58 degrees off-nadir from an altitude of 233 km, and thus were about 225 km wide.
The sensor orbit is sun synchronous with a 26 day nadir and 1-5 days off nadir temporal resolution. The sensor also has the capability to produce full scene stereo images which can be used to create topographic maps.
Vertical photographs can be truly vertical (nadir), or slightly tilted (less than 3 degree from the vertical). Usually aerial photos are tilted to some degree. We refer to the term vertical photograph up to a tilt of 3 degree.
Focal Length - The distance between the nadir (center) point of the photographic lens to the photographic plane. Typical focal lengths are 153mm (6") and 305mm (12").
16.4 km - 17.6 km width at nadir
Superior image classification and analysis
11-bit digitization (up to 2,048 levels of gray scale) ...
The data products provided by Oceanpal are so-called "Level-2" or derived products, namely the significant wave height (a statistical measure of trough-to-crest wave height), and the height of the nadir antenna over the mean level of the water ...
 See also: Information, Image, Surface, Area, Cover
  
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