This US ( NASA and USGS ) satellite tv for pc distant sensing programme was the first civil Earth-observing satellite programme. It began with the first Landsat satellite tv for pc’s launch in 1972 and is continuing with Landsat 7, still operational. For nearly 40 years, the Landsat program has continuously collected spectral information from Earth’s surface; this unparalleled information archive offers scientist the ability to assess changes in Earth’s panorama. Since June 2009, the whole Landsat picture archive is out there at no charge online (see website Earth Explorer from the U.S. Geological Survey).
We are going to obtain Landsat 7 and eight photographs using the SCP tool Download Landsat Landsat pictures can be found from the U.S. Geological Survey, and these bands are downloaded by way of the Google Earth Engine and the Amazon Web Companies. Additionally, we’re going to convert Landsat photographs to reflectance and apply the DOS1 atmospheric correction (see Landsat picture conversion to reflectance and DOS1 atmospheric correction ).
At the start of the U.S. free Landsat data coverage solely Landsat photographs with cloud cover <20% have="" been="" l1t="" processed,="" this="" threshold="" was="" subsequently="" modified="" to="">20%><40%, then="">40%,>
However that’s not how issues happened. For example, the time of day of the eruption and the season of the … Read the rest