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... > Instruments > Earth Remote Sensing Instruments > Passive Remote Sensing > Photon/Optical Detectors > Cameras > GIS

Preferred term

GIS  

Definition

  • GIS is a pushbroom imaging system whose basic elements are the optics subsystem (telescope assembly), the focal plane assembly (CCD detector), and the digital electronics subsystem. The optics subsystem employs a TMA (Three Mirror Anastigmatic) telescope design with a primary mirror aperture of 1.1 m in diameter. Three mirrors are used to image and focus the light, and two additional mirrors to direct the image to the FPA (Focal Plane Assembly). The telescope is designed to give a near-perfect (diffraction limited) image to the FPA and to convert the analog pixels into digitized signals. The FPA consists of an array of CCD detectors with 8 µm pixel size for PAN and 32 µm pixel size for multispectral imagery. ITT has included an outer barrel and door assembly to help protect the telescope and maintain its thermal environment. Imager type Pushbroom imager. Lline scan imaging system with TDI (Time Delay Integration) capability Imaging mode Panchromatic (Pan) Multispectral (MS) Spectral range 450-900 nm 450-510 nm (blue) 520-580 nm (green) 655-690 nm (red) 780-920 nm (near infrared) Spatial resolution at nadir 0.41 m GSD 1.64 m GSD Swath width 15.2 km (multiple adjoining paths can be imaged in a target area in a single orbit pass due to S/C agility) Detectors Pan: Si CCD array (8 µm pixel size) with a row of > 35,000 detectors MS: Si CCD 4 arrays (32 µm pixel size) with a row of > 9,300 detectors Data quantization 11 bit Geolocation accuracy of imagery ≤ 3 m (using a GPS receiver, a gyroscope and a star tracker) without any GCP (Ground Control Points) Optics TMA telescope (5-element modified Cassegrain optical design) Aperture diameter of 1.1 m, focal length = 13.3 m, f/12 FOV (Field of View) > 1.28º Instrument size 3 m tall (the volume is 5.3 m3) Total instrument mass 452 kg (en)

Broader concept

Change note

  • 2018-07-05 11:27:53.0 [mmorahan] Insert Concept add broader relation (GIS [992cb370-d2d0-4a9f-a4d4-179f140f505a,367767] - Cameras [d322ae9d-bde0-448f-948d-777aef096eb6,348777]);
  • 2018-07-05 11:31:04.0 [mmorahan] insert AltLabel (id: null category: primary text: GeoEye Imaging System language code: en); insert Definition (id: null text: GIS is a pushbroom imaging system whose basic elements are the optics subsystem (telescope assembly), the focal plane assembly (CCD detector), and the digital electronics subsystem. The optics subsystem employs a TMA (Three Mirror Anastigmatic) telescope design with a primary mirror aperture of 1.1 m in diameter. Three mirrors are used to image and focus the light, and two additional mirrors to direct the image to the FPA (Focal Plane Assembly). The telescope is designed to give a near-perfect (diffraction limited) image to the FPA and to convert the analog pixels into digitized signals. The FPA consists of an array of CCD detectors with 8 µm pixel size for PAN and 32 µm pixel size for multispectral imagery. ITT has included an outer barrel and door assembly to help protect the telescope and maintain its thermal environment. Imager type Pushbroom imager. Lline scan imaging system with TDI (Time Delay Integration) capability Imaging mode Panchromatic (Pan) Multispectral (MS) Spectral range 450-900 nm 450-510 nm (blue) 520-580 nm (green) 655-690 nm (red) 780-920 nm (near infrared) Spatial resolution at nadir 0.41 m GSD 1.64 m GSD Swath width 15.2 km (multiple adjoining paths can be imaged in a target area in a single orbit pass due to S/C agility) Detectors Pan: Si CCD array (8 µm pixel size) with a row of > 35,000 detectors MS: Si CCD 4 arrays (32 µm pixel size) with a row of > 9,300 detectors Data quantization 11 bit Geolocation accuracy of imagery ≤ 3 m (using a GPS receiver, a gyroscope and a star tracker) without any GCP (Ground Control Points) Optics TMA telescope (5-element modified Cassegrain optical design) Aperture diameter of 1.1 m, focal length = 13.3 m, f/12 FOV (Field of View) > 1.28º Instrument size 3 m tall (the volume is 5.3 m3) Total instrument mass 452 kg language code: en);
  • 2019-02-19 13:00:06.0 [mmorahan] insert WeightedRelation (id: null related concept uuid: 47943416-e045-4d6d-b18e-3d1cc51734e0 relationship type: null relationship value: null generated by: null);

URI

https://gcmd.earthdata.nasa.gov/kms/concept/992cb370-d2d0-4a9f-a4d4-179f140f505a

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