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  2. Tree height measurement - Wikipedia

    en.wikipedia.org/wiki/Tree_height_measurement

    In 2012 Google Earth began offering 3D models of some major cities using stereophotogrammetry [53] which allows users to measure the height of buildings and trees by adjusting the altitude of a Polygon in 3D, or use the Ruler function to measure the height of an object in a 3D path in Google Earth Pro. [54]

  3. Earth's circumference - Wikipedia

    en.wikipedia.org/wiki/Earth's_circumference

    Earth's circumference is the distance around Earth. Measured around the equator, it is 40,075.017 km (24,901.461 mi). Measured passing through the poles, the circumference is 40,007.863 km (24,859.734 mi). [1] Treating the Earth as a sphere, its circumference would be its single most important measurement. [2]

  4. Geographic coordinate system - Wikipedia

    en.wikipedia.org/wiki/Geographic_coordinate_system

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

  5. Tree crown measurement - Wikipedia

    en.wikipedia.org/wiki/Tree_crown_measurement

    Google Earth itself includes a ruler tool that can be used to measure diameters or spokes across the crown of the tree. Alternatively, the crown area can be measured and crown spread calculated from that value. EasyAcreage [8] is a Google Earth area measurement tool that calculates the area of any shape outlined on the Google Earth display. The ...

  6. Geographical distance - Wikipedia

    en.wikipedia.org/wiki/Geographical_distance

    Geographical distance or geodetic distance is the distance measured along the surface of the Earth, or the shortest arch length. The formulae in this article calculate distances between points which are defined by geographical coordinates in terms of latitude and longitude. This distance is an element in solving the second (inverse) geodetic ...

  7. Elevation - Wikipedia

    en.wikipedia.org/wiki/Elevation

    The term elevation is mainly used when referring to points on the Earth's surface, while altitude or geopotential height is used for points above the surface, such as an aircraft in flight or a spacecraft in orbit, and depth is used for points below the surface. Elevation histogram of the Earth's surface

  8. Smoot - Wikipedia

    en.wikipedia.org/wiki/Smoot

    Starting in 2011, Google Earth enabled the ability to measure distance using smoots, with the standard length of 5 feet 7 inches. [20] The calculator function of Google Search also provides values in smoots, [21] and in 2011, smoot was one of the 10,000 new words added to the fifth edition of The American Heritage Dictionary.

  9. Altitude - Wikipedia

    en.wikipedia.org/wiki/Altitude

    Height is the vertical distance above a reference point, commonly the terrain elevation. In UK aviation radiotelephony usage, the vertical distance of a level, a point or an object considered as a point, measured from a specified datum ; this is referred to over the radio as height , where the specified datum is the airfield elevation (see QFE ...