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The Global Positioning System ( GPS ), originally Navstar GPS, [2] is a satellite-based radio navigation system owned by the United States government and operated by the United States Space Force. [3] It is one of the global navigation satellite systems (GNSS) that provide geolocation and time information to a GPS receiver anywhere on or near ...
A satellite or artificial satellite [a] is an object, typically a spacecraft, placed into orbit around a celestial body. Satellites have a variety of uses, including communication relay, weather forecasting, navigation ( GPS ), broadcasting, scientific research, and Earth observation. Additional military uses are reconnaissance, early warning ...
Tomnod was a project owned by Colorado-based satellite company DigitalGlobe that used crowdsourcing to identify objects and places in satellite images. It was announced Tomnod was no longer using crowdsourcing of images as of 1 August 2019. [2]
Google Maps displays satellite imagery using the WGS-84 coordinate system, and street maps using the GCJ-02 datum. The China GPS shift (or offset) problem is a class of issues stemming from the difference between the GCJ-02 and WGS-84 datums.
Map all coordinates using OpenStreetMap. This list of impact structures on Earth contains a selection of the 190 confirmed craters given in the Earth Impact Database as of 2017. [1] [a] To keep the lists manageable, only the largest impact structures within a time period are included. Alphabetical lists for different continents can be found ...
Early world maps. The earliest known world maps date to classical antiquity, the oldest examples of the 6th to 5th centuries BCE still based on the flat Earth paradigm. World maps assuming a spherical Earth first appear in the Hellenistic period. The developments of Greek geography during this time, notably by Eratosthenes and Posidonius ...
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