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The wavelengths are approximate; exact values depend on the particular instruments (e.g. characteristics of satellite's sensors for Earth observation, characteristics of illumination and sensors for document analysis): Blue, 450–515/520 nm, is used for atmosphere and deep water imaging, and can reach depths up to 150 feet (50 m) in clear water.
The first "coarse maps of the solar radiation reflected by the Earth and the infrared radiation emitted by the Earth", from a mission launched on October 13, 1959. [21] 1960 TIROS-1: First television image of Earth from space and first weather satellite picture. [22] August 18, 1960 CORONA
The first satellite in the JPSS is the Suomi NPP satellite, which launched on October 28, 2011. This was followed by JPSS-1, which was launched on November 18, 2017, three years later than originally anticipated when the contract was awarded in 2010. [ 1 ]
The 2024 Portugal wildfires are a series of more than 1,000 wildfires [2], at least 128 labeled as devastating, that spread through central and northern Portugal since 15 September 2024, burning more than 135,000 hectares of land, resulting in the deaths of at least nine people [5] - amongst them were four firefighters -, the evacuation of several villages, and a response of over 5,000 ...
Google uses GCJ-02 data for the street map, but does not shift the satellite imagery layer, which continues to use WGS-84 coordinates, [45] with the benefit that WGS-84 positions can still be overlaid correctly on the satellite image (but not the street map). Google Earth also uses WGS-84 to display the satellite imagery. [46]
When an Earth observation satellite or a communications satellite is deployed for military or intelligence purposes, it is known as a spy satellite or reconnaissance satellite. Their uses include early missile warning, nuclear explosion detection, electronic reconnaissance, and optical or radar imaging surveillance.
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