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  2. Acre - Wikipedia

    en.wikipedia.org/wiki/Acre

    The acre is still a statutory measure in the United States. Both the international acre and the US survey acre are in use, but they differ by only four parts per million (see below). The most common use of the acre is to measure tracts of land. The acre is used in many established and former Commonwealth of Nations countries by

  3. Google Earth - Wikipedia

    en.wikipedia.org/wiki/Google_Earth

    Google Earth is a web and computer program that renders a 3D representation of Earth based primarily on satellite imagery.The program maps the Earth by superimposing satellite images, aerial photography, and GIS data onto a 3D globe, allowing users to see cities and landscapes from various angles.

  4. Terraserver.com - Wikipedia

    en.wikipedia.org/wiki/Terraserver.com

    Subscribers to TerraServer.com gain access to a drawing and measuring tool that can measure surface distance and area on the images. TerraServer also makes a number of image overlays available, including road names, FEMA flood data, earthquake data, landslide data, real estate parcels, parks, schools, hospitals, airports, and zip codes.

  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. Public Land Survey System - Wikipedia

    en.wikipedia.org/wiki/Public_Land_Survey_System

    In the original Homestead Act of 1862, during the Lincoln administration, each settler was allocated 160 acres (0.65 km 2) of land, a quarter-section. Later amendments of the Homestead Act allocated more land, as much as 640 acres (2.6 km 2), a section. This was a good revision to apply to land that was drier or more desolate than the earlier ...

  7. Hectare - Wikipedia

    en.wikipedia.org/wiki/Hectare

    Image comparing the hectare (the small blue area at lower left) to other units. The entire yellow square is one square mile.. The hectare (/ ˈ h ɛ k t ɛər,-t ɑːr /; SI symbol: ha) is a non-SI metric unit of area equal to a square with 100-metre sides (1 hm 2), that is, 10,000 square metres (10,000 m 2), and is primarily used in the measurement of land.

  8. Gunta - Wikipedia

    en.wikipedia.org/wiki/Gunta

    Download as PDF; Printable version; ... This unit is typically used to measure the size of a piece of land. ... 40 gunthas = 1.0 acre; 4 acre = 1 fg;

  9. Tree height measurement - Wikipedia

    en.wikipedia.org/wiki/Tree_height_measurement

    No direct measurement to the tree's trunk or top is taken in the parallax Method. Three verticals method (formerly the triangle method) is a modification of the simpler parallax method. [39] It is possible to measure the height of a tree indirectly without taking any horizontal sweep angles, which can be difficult to obtain accurately in the field.

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