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  1. 2 days ago · The geographic coordinate system (GCS) is a spherical or geodetic coordinate system for measuring and communicating positions directly on the Earth as latitude and longitude. It is the simplest, oldest and most widely used of the various spatial reference systems that are in use, and forms the basis for most others.

    • Decimal Degrees

      Decimal degrees (DD) is a notation for expressing latitude...

  2. 3 days ago · The Global Positioning System (GPS), originally Navstar GPS, is a satellite-based radio navigation system owned by the United States government and operated by the United States Space Force. It is one of the global navigation satellite systems (GNSS) that provides geolocation and time information to a GPS receiver anywhere on or near the Earth ...

    • United States
    • Military, civilian
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  4. Sep 20, 2021 · A geographic coordinate system (GCS) uses a three-dimensional spherical surface to define locations on the earth. A GCS is often incorrectly called a datum, but a datum is only one part of a GCS. A GCS includes an angular unit of measure, a prime meridian, and a datum (based on a spheroid ). A point is referenced by its longitude and latitude ...

  5. Sep 13, 2023 · These pages are a compilation of lecture notes for my Introduction to GIS and Spatial Analysis course (ES214). They are ordered in such a way to follow the course outline, but most pages can be read in any desirable order. The course (and this book) is split into two parts: data manipulation & visualization and exploratory spatial data analysis ...

  6. › wiki › GeographyGeography - Wikipedia

    3 days ago · Geography is a systematic study of the Earth (other celestial bodies are specified, such as "geography of Mars", or given another name, such as areography in the case of Mars), its features, and phenomena that take place on it.

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