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Movements, leaders, victories and the continuing fight for equality.
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Meet the people whose lives, choices and achievements shaped the journey.
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In August 1908, a white mob attacked Springfield, Illinois’s Black community, destroying homes and businesses and lynching two Black men. National outrage over the violence helped spur the movement that created the NAACP the following year.
MORE →Reflects the personal views, recollections, and perspective of the author, Mike Davis.
This is a personal recollection on the Move fire on May 13, 1985
QuickBird was a high-resolution commercial Earth observation satellite, owned by DigitalGlobe, launched in 2001 and reentered after orbit decay in 2015. QuickBird used Ball Aerospace's Global Imaging System 2000 (BGIS 2000). The satellite collected panchromatic (black and white) imagery at 61 centimeter resolution and multispectral imagery at 2.44- (at 450 km) to 1.63-meter (at 300 km) resolution, as orbit altitude is lowered during the end of mission life.
At this resolution, detail such as buildings and other infrastructure are easily visible. However, this resolution is insufficient for working with smaller objects such as a license plate on a car. The imagery can be imported into remote sensing image processing software, as well as into GIS packages for analysis.
Contractors included Ball Aerospace & Technologies, Kodak and Fokker Space. Original plans called for a constellation of three QuickBird satellites scheduled to be in orbit by 2008. In the end, two QuickBird satellites, QuickBird I and II, made it to launch pad. However, only QuickBird II made it successfully into orbit (QuickBird I suffered launch failure). Thus QuickBird II satellite is usually referred to simply as QuickBird, and by the name QuickBird is usually meant the satellite QuickBird II.
Prior to QuickBird I and II, DigitalGlobe launched the EarlyBird 1 successfully in 1997 but the satellite lost communications after only four days in orbit due to power system failure.
The first QuickBird, QuickBird I (or QuickBird 1, QB 1, COSPAR 2000-074A) was launched 20 November 2000, by EarthWatch from the Plesetsk Cosmodrome in Russia by a Kosmos-3M rocket. QB-1 failed to reach planned orbit due to launch vehicle failure and was declared a failure. The satellite re-entered next day still attached to the upper stage of the rocket.[1][2] The QB-1 satellite was in construction similar to QuickBird 2 satellite (described above and below in this article), which became later known simply as QuickBird.[3]
QuickBird II (also QuickBird-2 or Quickbird 2, QB-2, COSPAR 2001-047A) or as it was later known, simply QuickBird, was launched for DigitalGlobe October 18, 2001 from the Vandenberg Air Force Base, California, aboard a Boeing Delta II rocket.[4] The satellite was initially expected to collect at 1 meter resolution but after a license was granted in 2000 by the U.S. Department of Commerce / NASA, DigitalGlobe was able launch the QuickBird II with 0.61 meter panchromatic and 2.4 meter multispectral (previously planned 4 meter) resolution.[4][3]
In April 2011, the Quickbird satellite was raised from an orbit of 450 km (280 mi) to 482 km (300 mi).[5] The process, started in March 2011, extended the satellite's life. Before the operation the useful life of Quickbird was expected to drop off around mid-2012 but after the successful mission, the new orbit prolonged the satellite life into early 2015.
The last picture was acquired on December 17, 2014. On January 27, 2015, QuickBird re-entered Earth's atmosphere.
Sensors
Swath width and area size
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Spacecraft
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Source: Wikipedia. Article content is retrieved live through the MediaWiki API.
QuickBird was a high-resolution commercial Earth observation satellite, owned by DigitalGlobe, launched in 2001 and reentered after orbit decay in 2015. QuickBird used Ball Aerospace's Global Imaging System 2000 (BGIS 2000). The satellite collected panchromatic (black and white) imagery at 61 centimeter resolution and multispectral imagery at 2.44- (at 450 km) to 1.63-meter (at 300 km) resolution, as orbit altitude is lowered during the end of mission life. At this resolution, detail such as buildings and other infrastructure are easily visible. However, this resolution is insufficient for working with smaller objects such as a license plate on a car. The imagery can be imported into remote sensing image processing software, as well as into GIS packages for analysis. Contractors included Ball Aerospace & Technologies, Kodak and Fokker Space. Original plans called for a constellation of three QuickBird satellites scheduled to be in orbit by 2008. In the end, two QuickBird satellites, QuickBird I and II, made it to launch pad. However, only QuickBird II made it successfully into orbit (QuickBird I suffered launch failure). Thus QuickBird II satellite is usually referred to simply as QuickBird, and by the name QuickBird is usually meant the satellite QuickBird II. Prior to QuickBird I and II, DigitalGlobe launched the EarlyBird 1 successfully in 1997 but the satellite lost communications after only four days in orbit due to power system failure.
This is a list of Sphenisciformes species by global population. While numbers are estimates, they have been made by experts in their fields. Sphenisciformes (from the Latin for "wedge-shaped") is the taxonomic order to which penguins belong. The IOC World Bird List recognizes 19 species of Sphenisciformes. BirdLife International has assessed 18 species (95% of total species), all of which have had their population estimated. This list follows IUCN classifications for species names and taxonomy. Where IUCN classifications differ from other ornithological authorities, alternative names and taxonomies are noted. A variety of methods are used for counting penguins, including the first census from space in April 2012, when imagery from Ikonos, QuickBird-2, and WorldView-2 satellites were used to count emperor penguins in Antarctica. Most maritime surveys use strip transect and distance sampling to measure penguin species density; this is then extrapolated over the animal's range. The Galapagos penguin has been counted annually since 1961 by the Galápagos National Park Service. For more information on how these estimates were ascertained, see Wikipedia's articles on population biology and population ecology. Extinct species from this order include the Waitaha penguin, which went extinct between 1300–1500 (soon after the Polynesian arrival to New Zealand), and the Chatham penguin, which is only known through subfossils; however, an extant individual may have been kept in captivity by researchers sometime between 1867 and 1872.
WorldView-1 (WV 1) is a commercial Earth observation satellite owned by Vantor (formerly DigitalGlobe). WorldView-1 was launched on 18 September 2007, followed later by the WorldView-2 in 2009. First imagery from WorldView-1 was available in October 2007, prior to the six-year anniversary of the launch of QuickBird, DigitalGlobe's previous satellite. WorldView-1 was partially financed through an agreement with the National Geospatial-Intelligence Agency (NGA). Some of the imagery captured by WorldView-1 for the NGA is not available to the general public. However, WorldView-1 freed capacity on DigitalGlobe's QuickBird satellite to meet the growing commercial demand for multi-spectral geospatial imagery.
WorldView-2 (WV 2) is a commercial Earth observation satellite owned by Vantor (formerly DigitalGlobe). WorldView-2 provides commercially available panchromatic imagery of 0.46 m (18 in) resolution, and eight-band multispectral imagery with 1.84 m (72 in) resolution. It was launched 8 October 2009 to become DigitalGlobe's third satellite in orbit, joining WorldView-1 which was launched in 2007 and QuickBird which was launched in 2001. It takes a new photograph of any place on Earth every 1.1 days.
Before the 1921 destruction of Tulsa’s Greenwood District, Black residents had created a remarkable center of business and community life. The district included stores, professional offices, entertainment venues and homes owned by Black citizens. Understanding Greenwood means learning what was built—not only what was burned.
MORE →The Greenwood District.
