Computer Sciences

Neural network can read tree heights from satellite images

Using an artificial neural network, researchers at ETH Zurich have created the first high-resolution global vegetation height map for 2020 from satellite images. This map could provide key information for fighting climate ...

Engineering

Using nature's structures in wooden buildings

Concern about climate change has focused significant attention on the buildings sector, in particular on the extraction and processing of construction materials. The concrete and steel industries together are responsible ...

Security

Taking a systems approach to cyber security

As critical infrastructure components such as electric power grids become more sophisticated, they are also becoming increasingly more reliant on digital networks and smart sensors to optimize their operations, and thus more ...

Engineering

Trees outside the dyke well-suited for dampening waves

Research by TU Delft, Deltares and NIOZ Royal Netherlands Institute for Sea Research has revealed that trees can clearly dampen waves. The trees can also withstand high waves without trouble. Planting trees in front of dykes ...

Energy & Green Tech

Tree trimming pays dividends for energy customers

Eversource Energy's tree trimming program led to 900 fewer tree-caused power outages per year, according to research done by UConn energy analysts and published this month in the journal Energy Policy. For tree-caused power ...

Robotics

Soft perching robot validates the benefit of having a fifth leg

Geckos' impressive climbing abilities give them agility rarely surpassed in nature. With their highly specialized adhesive lamellae on their feet, geckos can climb up smooth vertical surfaces with ease and even move on a ...

page 1 from 3

Tree

A tree is a perennial woody plant. It is most often defined as a woody plant that has many secondary branches supported clear of the ground on a single main stem or trunk with clear apical dominance. A minimum height specification at maturity is cited by some authors, varying from 3 m to 6 m; some authors set a minimum of 10 cm trunk diameter (30 cm girth). Woody plants that do not meet these definitions by having multiple stems and/or small size, are called shrubs. Compared with most other plants, trees are long-lived, some reaching several thousand years old and growing to up to 115 m (379 ft) high.

Trees are an important component of the natural landscape because of their prevention of erosion and the provision of a weather-sheltered ecosystem in and under their foliage. Trees also play an important role in producing oxygen and reducing carbon dioxide in the atmosphere, as well as moderating ground temperatures. They are also elements in landscaping and agriculture, both for their aesthetic appeal and their orchard crops (such as apples). Wood from trees is a building material, as well as a primary energy source in many developing countries. Trees also play a role in many of the world's mythologies (see trees in mythology).

This text uses material from Wikipedia, licensed under CC BY-SA