@prefix skos: . skos:altLabel "LANDSAT-7 (LAND REMOTE-SENSING SATELLITE-7)"@en, "L7"@en ; skos:changeNote """2016-06-09 11:32:50.0 [epneff] added altLabel insert AltLabel (id: null text: L7 language code: en); """, """2016-06-09 11:33:25.0 [epneff] added altLabel insert AltLabel (id: null text: LANDSAT-7 (LAND REMOTE-SENSING SATELLITE-7) language code: en); """, """2019-12-31 16:48:51.0 [sritz] update Definition (Landsat 7 systematically provides well-calibrated, multispectral, moderate resolution, substantially cloud-free, sun-lit digital images of the Earth's continental and coastal areas with global coverage on a seasonal basis. It covers the United States every 16 days. Operations were transferred to USGS on Fall 2000. The Landsat Project is a joint initiative of the U.S. Geological Survey (USGS) and the NASA to gather Earth resource data using a series of satellites. NASA was responsible for developing and launching the spacecrafts, while the USGS is responsible for flight operations, maintenance, and management of all ground data reception, processing, archiving, product generation, and distribution. The primary objective of the Landsat Project is to ensure a collection of consistently calibrated Earth imagery. Landsat's Global Survey Mission is to establish and execute a data acquisition strategy that ensures repetitive acquisition of observations over the Earth's land mass, coastal boundaries, and coral reefs; and to ensure the data acquired are of maximum utility in supporting the scientific objectives of monitoring changes in the Earth's land surface and associated environment. Key Landsat 7 Facts [p. 176] Joint with U.S. Geological Survey (USGS) Heritage: Landsat 4, 5 Equatorial Crossing: 10:00 a.m. ± 15 mins Altitude: 705 km ± 5 km (at the equator) Inclination: 98.2° ± 0.15° Period: 98.9 min Repeat cycle: 16 days/233 orbits Dimensions: 4 m high, 2.7 m diameter Mass: 1982 kg Power: 1550 W Downlink: Three 150 Mbps wideband downlinks Antennas: 3 gimbaled X-band, 2 omni S-band Design Life: 5 years Spacecraft: Lockheed Martin ETM+: Raytheon Santa Barbara Remote Sensing Data Archival, Processing, Ground Operations: USGS National Center for Earth Resources Observation System (EROS) data center Spacecraft and Sensor Maintenance: NASA GSFC Calibration: EROS and GSFC Type: Circular, sun-synchronous [Summary provided by NASA.] Group: Platform_Details Entry_ID: LANDSAT-7 Group: Platform_Identification Platform_Category: Earth Observation Satellites Platform_Series_or_Entity: LANDSAT Short_Name: LANDSAT-7 End_Group Group: Platform_Associated_Instruments Short_Name: ETM+ End_Group Group: Orbit Orbit_Altitude: 705km Orbit_Inclination: 98.2 degree Equator_Crossing: nominally 10 AM Period: 99 minutes Repeat_Cycle: 16 days Orbit_Type: LEO > Low Earth Orbit > Polar Sun-Synchronous End_Group Creation_Date: 2007-02-02 Online_Resource: https://landsat.gsfc.nasa.gov/landsat-7/ Online_Resource: https://www.usgs.gov/land-resources/nli/landsat/landsat-7 Group: Platform_Logistics Launch_Date: 1999-03-15 Design_Life: 5 Years Primary_Sponsor: USA/USGS Primary_Sponsor: USA/NASA End_Group End_Group); update Definition (https://landsat.gsfc.nasa.gov/landsat-7/); delete Resource (null); """ ; skos:definition """Landsat 7 systematically provides well-calibrated, multispectral, moderate resolution, substantially cloud-free, sun-lit digital images of the Earth's continental and coastal areas with global coverage on a seasonal basis. It covers the United States every 16 days. Operations were transferred to USGS on Fall 2000. The Landsat Project is a joint initiative of the U.S. Geological Survey (USGS) and the NASA to gather Earth resource data using a series of satellites. NASA was responsible for developing and launching the spacecrafts, while the USGS is responsible for flight operations, maintenance, and management of all ground data reception, processing, archiving, product generation, and distribution. The primary objective of the Landsat Project is to ensure a collection of consistently calibrated Earth imagery. Landsat's Global Survey Mission is to establish and execute a data acquisition strategy that ensures repetitive acquisition of observations over the Earth's land mass, coastal boundaries, and coral reefs; and to ensure the data acquired are of maximum utility in supporting the scientific objectives of monitoring changes in the Earth's land surface and associated environment. Key Landsat 7 Facts [p. 176] Joint with U.S. Geological Survey (USGS) Heritage: Landsat 4, 5 Equatorial Crossing: 10:00 a.m. ± 15 mins Altitude: 705 km ± 5 km (at the equator) Inclination: 98.2° ± 0.15° Period: 98.9 min Repeat cycle: 16 days/233 orbits Dimensions: 4 m high, 2.7 m diameter Mass: 1982 kg Power: 1550 W Downlink: Three 150 Mbps wideband downlinks Antennas: 3 gimbaled X-band, 2 omni S-band Design Life: 5 years Spacecraft: Lockheed Martin ETM+: Raytheon Santa Barbara Remote Sensing Data Archival, Processing, Ground Operations: USGS National Center for Earth Resources Observation System (EROS) data center Spacecraft and Sensor Maintenance: NASA GSFC Calibration: EROS and GSFC Type: Circular, sun-synchronous [Summary provided by NASA.] Group: Platform_Details Entry_ID: LANDSAT-7 Group: Platform_Identification Platform_Category: Earth Observation Satellites Platform_Series_or_Entity: LANDSAT Short_Name: LANDSAT-7 End_Group Group: Platform_Associated_Instruments Short_Name: ETM+ End_Group Group: Orbit Orbit_Altitude: 705km Orbit_Inclination: 98.2 degree Equator_Crossing: nominally 10 AM Period: 99 minutes Repeat_Cycle: 16 days Orbit_Type: LEO > Low Earth Orbit > Polar Sun-Synchronous End_Group Creation_Date: 2007-02-02 Online_Resource: https://landsat.gsfc.nasa.gov/landsat-7/ Online_Resource: https://www.usgs.gov/land-resources/nli/landsat/landsat-7 Group: Platform_Logistics Launch_Date: 1999-03-15 Design_Life: 5 Years Primary_Sponsor: USA/USGS Primary_Sponsor: USA/NASA End_Group End_Group"""@en ; a skos:Concept ; skos:prefLabel "LANDSAT-7"@en ; skos:inScheme ; skos:broader . skos:prefLabel "LANDSAT"@en ; a skos:Concept ; skos:narrower .