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  2. Treemapping - Wikipedia

    en.wikipedia.org/wiki/Treemapping

    The original tree is converted to a binary tree: each node with more than two children is replaced by a sub-tree in which each node has exactly two children. Each region representing a node (starting from the root) is divided to two, using a line that keeps the angles between edges as large as possible.

  3. Forest cover by state and territory in the United States

    en.wikipedia.org/wiki/Forest_cover_by_state_and...

    Map of wood-filled areas in the United States, circa 2000 [1]. In the United States, the forest cover by state and territory is estimated from tree-attributes using the basic statistics reported by the Forest Inventory and Analysis (FIA) program of the Forest Service. [2]

  4. Forests of the United States - Wikipedia

    en.wikipedia.org/wiki/Forests_of_the_United_States

    It has been estimated that before European settlement, forests in the United States mainland covered nearly 1 billion acres (4,000,000 km 2). [1] Since the mid-1600s, about 300 million acres (1,200,000 km 2) of forest have been cleared, primarily for agriculture during the 19th century.

  5. List of national forests of the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_national_forests...

    Map of national forests and national grasslands of the United States. The United States has 154 protected areas known as national forests, covering 188,336,179 acres (762,169 km 2; 294,275 sq mi). [1] National forests are managed by the U.S. Forest Service, an agency of the U.S. Department of Agriculture. [2]

  6. Category:Trees of Northern America - Wikipedia

    en.wikipedia.org/wiki/Category:Trees_of_Northern...

    The Trees of North America. For the purposes of this category, "North America" is defined in accordance with the World Geographical Scheme for Recording Plant Distributions (WGSRPD), which calls it Northern America , namely as one of the nine "botanical continents".

  7. Wikipedia:Online maps of the United States - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Online_maps_of...

    Charting North America, maps and atlases in the New York Public Library Digital Collection Online digitized versions of many 18th- and 19th-century American atlases , as well as the 1897 Rand McNally Indexed Atlas of the World and many other maps, can be found at DavidRumsey.com .

  8. Tree line - Wikipedia

    en.wikipedia.org/wiki/Tree_line

    The tree line is the edge of a habitat at which trees are capable of growing and beyond which they are not. It is found at high elevations and high latitudes. Beyond the tree line, trees cannot tolerate the environmental conditions (usually low temperatures, extreme snowpack, or associated lack of available moisture).

  9. List of U.S. state and territory trees - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._state_and...

    Candlenut tree (kukui) Aleurites moluccanus: 1959 [18] Idaho: Western white pine: Pinus monticola: 1935 [19] Illinois: White oak: Quercus alba: 1973 [20] Indiana: Tulip tree: Liriodendron tulipifera: 1931 [21] Iowa: Oak (variety unspecified) Quercus spp. 1961 [22] Kansas: Eastern cottonwood: Populus deltoides: 1937 [23] Kentucky: Tulip-tree ...