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- 7eca5548-fc92-4adb-9e77-fe4a21bc6fb1 definition "[Source: National Space Science Data Center, http://nssdc.gsfc.nasa.gov/nmc/experimentDisplay.do?id=1966-040A-02 ] he Nimbus 2 Automatic Picture Transmission (APT) system was a camera and transmitter combination designed to transmit local daytime slow-scan television pictures of cloudcover conditions to properly equipped ground receiving stations on a real-time basis. The camera used a 108-deg wide-angle f/1.8 objective lens with a focal length of 6.0 mm. The camera was mounted facing earthward on the H-frame inside the sensory ring, with its optical axis parallel to the spacecraft spin axis. The actual photography required 8 s and the transmission 200 s. Earth-cloud images retained on the photosensitive surface of the 2.54-cm-diameter vidicon were read out at four lines per second to produce an 800-line picture. A 5-W TV transmitter (137.5 MHz) relayed the pictures to local APT stations within communication range. The faceplate of the vidicon had reticle marks that appeared on the picture format to aid in relating the picture to its geographical position on the earth's surface. From the satellite attitude and altitude (approximately 1100 km), a picture covered a 1200- by 1200-km square with a horizontal resolution of better than 3 km at nadir. The APT system was capable of transmitting the nighttime high-resolution infrared radiometer (HRIR) sensor output through the APT transmitter. Hence, with some minor modifications, an APT station within telemetry range could receive HRIR data in the direct readout infrared radiometer (DRIR) mode. The experiment was a success, and good data were obtained during its operational lifetime. More detailed information can be found in Section 5 of the 'Nimbus II Users' Guide' (TRF B03406), available from NSSDC. APT/DRIR data are primarily intended for operational use within the local APT acquisition station and are generally not available for distribution. Group: Instrument_Details Entry_ID: APT NIMBUS-2 Group: Instrument_Identification Instrument_Category: Earth Remote Sensing Instruments Instrument_Class: Passive Remote Sensing Instrument_Type: Photon/Optical Detectors Instrument_Subtype: Cameras Short_Name: APT NIMBUS-2 Long_Name: Automatic Picture Transmission System on NIMBUS-2 End_Group Group: Associated_Platforms Short_Name: NIMBUS-2 End_Group Group: Spectral_Frequency_Information Wavelength_Keyword: Visible End_Group Online_Resource: http://nssdc.gsfc.nasa.gov/nmc/experimentDisplay.do?id=1966-040A-02 Online_Resource: http://nasascience.nasa.gov/missions/nimbus Online_Resource: http://atmospheres.gsfc.nasa.gov/nimbus/ Creation_Date: 2009-07-16 Group: Instrument_Logistics Instrument_Owner: USA/NASA End_Group End_Group" @default.
- 7eca5548-fc92-4adb-9e77-fe4a21bc6fb1 id "1655012" @default.
- 7eca5548-fc92-4adb-9e77-fe4a21bc6fb1 path_id 4f81c61c-f100-4bc4-9664-d9b70d2f162f @default.
- 7eca5548-fc92-4adb-9e77-fe4a21bc6fb1 path_id 6015ef7b-f3bd-49e1-9193-cc23db566b69 @default.
- 7eca5548-fc92-4adb-9e77-fe4a21bc6fb1 path_id 72227178-bb4c-4ff5-98a3-f976aa3f3714 @default.
- 7eca5548-fc92-4adb-9e77-fe4a21bc6fb1 path_id b2140059-b3ca-415c-b0a7-3e142783ffe8 @default.
- 7eca5548-fc92-4adb-9e77-fe4a21bc6fb1 path_id d322ae9d-bde0-448f-948d-777aef096eb6 @default.
- 7eca5548-fc92-4adb-9e77-fe4a21bc6fb1 path_label "Cameras" @default.
- 7eca5548-fc92-4adb-9e77-fe4a21bc6fb1 path_label "Earth Remote Sensing Instruments" @default.
- 7eca5548-fc92-4adb-9e77-fe4a21bc6fb1 path_label "Instruments" @default.
- 7eca5548-fc92-4adb-9e77-fe4a21bc6fb1 path_label "Passive Remote Sensing" @default.
- 7eca5548-fc92-4adb-9e77-fe4a21bc6fb1 path_label "Photon/Optical Detectors" @default.
- 7eca5548-fc92-4adb-9e77-fe4a21bc6fb1 prefLabel "APT Nimbus-2" @default.
- 7eca5548-fc92-4adb-9e77-fe4a21bc6fb1 reference "" @default.
- 7eca5548-fc92-4adb-9e77-fe4a21bc6fb1 tag "Instruments" @default.