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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.
The Moderate Resolution Imaging Spectroradiometer (MODIS) is a satellite-based sensor used for earth and climate measurements. There are two MODIS sensors in Earth orbit : one on board the Terra ( EOS AM) satellite, launched by NASA in 1999; and one on board the Aqua (EOS PM) satellite, launched in 2002.
the clockwise horizontal angle measured about the ground nadir point from the ground survey North meridian in the plane of photograph. orthomosaic A high-resolution map created by orthophotos, usually via drones is termed as an orthomosaic. Ortho meaning a nadir image and mosaic meaning a collection of images. Temporal Resolution Time between ...
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
WorldView-3 (WV 3) is a commercial Earth observation satellite owned by DigitalGlobe.It was launched on 13 August 2014 to become DigitalGlobe's sixth satellite in orbit, joining Ikonos which was launched in 1999, QuickBird in 2001, WorldView-1 in 2007, GeoEye-1 in 2008, and WorldView-2 in 2009.
The GeoEye-2 satellite is designed to provide panchromatic images at a highest resolution of 0.31 meters per pixel (12.2 in/px), and multispectral images at 1.24 meters per pixel (48.8 in/px). [20] The spacecraft was designed and built by Lockheed Martin, [ 21 ] while the camera payload was provided by ITT Corporation .
Tomnod used online map interfaces that engage many people to each view and tag a small section of a large area on the planet. In 2011 Tomnod cooperated with the UNHCR to locate refugee camps in Somalia. [8] Users were asked to use satellite images to count the shelters of refugees.
The ABI takes images with three different geographic extents, [26] with each image produced as a combination of stitched west-to-east narrow image scans made by the instrument. [30] In the default "flex" mode (scan mode 3) of operation, the ABI produces full-disk images of the Earth every 15 minutes, with a spatial resolution of 0.5–2 km (0. ...