Usable area: length * width from the shed;

Building area: from the outside of the greenhouse wall, length * width;

Coverage area: the construction area of the greenhouse with sunshade is generally 2 times of the construction area;

At present, statistics are mainly based on building area.

Greenhouse, also known as greenhouse. Facilities that can transmit light, keep warm (or heat) and be used for cultivating plants. It can provide greenhouse growth period in the season unsuitable for plant growth, increase yield, and is mostly used for cultivation or seedling raising of plants such as warm vegetables, flowers and trees in the low temperature season. There are many types of greenhouses, which can be divided into many types according to the different roof truss materials, lighting materials, shapes and heating conditions.

The types of greenhouses are planting greenhouses, breeding greenhouses, exhibition greenhouses, experimental greenhouses, catering greenhouses and entertainment greenhouses. The design of greenhouse system includes heating system, insulation system, cooling system, ventilation system, control system and irrigation system. The greenhouse is just a simple plastic film and skeleton structure, with few internal facilities and not as high as the requirements of the greenhouse. So strictly speaking, greenhouses have higher requirements for greenhouse equipment, and it may be necessary to use more advanced instruments to strictly control the temperature.

But in a broad sense, a greenhouse is a kind of greenhouse. Its purpose is also to keep a certain temperature.