Landsat 7 is a satellite tv for pc of the USGS Landsat 7 Mission The satellite is supplied with an Enhanced Thematic Mapper Plus (ETM+) instrument that’s an eight-band multispectral scanning radiometer capable of offering reasonable resolution image information of the Earth’s floor.
Launched on April 15, 1999, Landsat-7 was designed for a 705 km, Earth mapping orbit with a repeat cycle of sixteen days. Its payload is the Enhanced Thematic Mapper Plus (ETM+), a single nadir-pointing instrument which gives for an eight-band multispectral scanning radiometer capable of providing high-decision image info of the Earth’s floor. Designed to collect, filter and detect radiation from the Earth in a swath 185 km extensive because it passes overhead, the ETM+ produces roughly three.eight gigabits of data for every scene.
Pada tahap penyesuaian dapat dilakukan pengambilan citra dengan mayoritas space permukaan tanahnya cukup rata sehingga sebagian kecil saja daerah yang memiliki tingkat ketinggian yang berbeda seperti lembah, bukit atau gunung. Setelah dilakukan koreksi geometrik kemudian akan diambil kombinasi band 742 dari citra Landsat, kombinasi band 742 ini memang sesuai dengan identifikasi penutup lahan. Sedangkan untuk citra SPOT yang diambil hanya band pankromatiknya saja karena band tersebut akan digunakan untuk menajamkan batas-batas penutup lahan secara spasial pada citra Landsat.
NASA Studying Technologies has processed the Landsat 7 information to create their very own imagery. Pan-sharpening the photographs was deliberate, nonetheless other priorities mean that 30 meters would be the most resolution for the forseeable future. See NLT Landsat Processing Strategies for info on how the data was processed, and NLT Knowledge Points for recognized points.
In 1992, the U.S. Congress passed and President Bush signed legislation that returned future Landsat operations to the general public realm, starting with Landsat 7 within the late 1990s. Landsat was made a part of NASA’s Mission to Planet Earth program in 1994, and President Clinton established Landsat 7 as a joint program with NASA, NOAA (later dropped out), and the U.S. Geological Survey’s EROS Middle (EDC). NASA constructed and launched the satellite on April 15, 1999, and flight operations were later turned over to EDC (Williams et al. 1999). The EDC archives all Landsat 7 information.
