The Landsat satellites have been monitoring the Earth since 1972. Tens of billions of sq. kilometers of the Earth have been coated by Landsat sensors and this imagery has provided practical info to scientists from many various Earth science disciplines.
This 3-D view of the Alcedo Volcano on Isabela, one of many Galápagos Islands, was created by overlaying topographic information with SIR-C/X-SAR radar imagery. On this picture the radar data helps to delineate totally different volcanic features. The rougher textured lava flows appear as bright options, whereas smoother ash deposits and lava flows appear darker.
Beijing was established as a metropolis in 1045 B.C. King Wu was the first to declare town as a capital in 1057 B.C. It was Kublai Khan who established the Forbidden City in 1260 A.D. It nonetheless stands as Beijing’s city middle. In 1421 the Chinese took the city back and gave it its current name of Beijing. Having served because the capital of the Liao, Jin, Yuan, Ming and Qing Dynasties, this contemporary metropolis is now the capital of the Individuals’s Republic of China.
The newest in this sequence of distant sensing satellites is Landsat 7. Launched on 15 April 1999, Landsat 7 has the new Enhanced Thematic Mapper Plus (ETM+) sensor. This sensor has the identical 7 spectral bands as its predecessor, TM, but has an added panchromatic band with 15-metre decision and a higher resolution thermal band of 60 metres. The ETM+ sensor additionally has a 5 percent absolute radiometric calibration.
Metode Pan-Sharpening banyak dilakukan untuk mengakali kebutuhan akan citra yang lebih detail dengan harga yang lebih murah. Selain dalam penggunaan citra landsat 8 sehingga menjadi citra yang memiliki resolusi 15 meter. Contoh lain dapat dilakukan pada saat kita menggunakan citra satelit Alos Avnir yang memiliki resolusi spasial 10 meter akan dilakukan fusi dengan citra Alos Prism yang memiliki resolusi spasial 2,5. Dengan demikian akan mendapatkan citra satelit dengan resolusi 2,5 meter dan citra tersebut memiliki warna dari citra Alos Avnir. Dan biaya mendapatkan citra tersebut akan lebih murah dibandingkan dengan membeli langsung citra resolusi tinggi yang berharga mahal.
