An old instrument used for taking altitudes; -- called also geometrical square, and line of shadows.
a square or rectangular sampling unit of known area (e.g.,1 m2) within which organisms are counted or measured. Quadrats can be used to estimate the percent cover of each species or other reef components and obtain information about density, abundance, colony size, and biodiversity
an ecological sampling tool that makes it possible to compare numbers and types of organisms from different parts of a habitat. A quadrat is a square frame of any size that can be placed randomly or along a transect line. The organisms within the square are counted or measured.
a square measuring area used to sample living things in a given site. Quadrats can vary in size. In the methodology used by the Smithsonian Institution's Monitoring and Assessment of Biodiversity Program, a quadrat is 20 metres by 20 metres.
A frame of a given size which is used to ensure that the same area of ground is sampled at each sampling station.
a four-sided figure which delimits the boundaries of a sample plot
a grid and this one is overlaid over the census tracts to give estimates of the per capita income in each little square
a one-metre square measuring device
a small square area of known dimensions that represents a small segment of the environment being studied
a square of known dimensions, with dividing lines a known distance apart
a term used in field studies meaning a measured off square of conveniently sized dimensions
a sampling plot used for ecological or population studies.
a sampling unit used to measure the number of individuals within a specific area.
A specific area used for sampling (e.g., 1 square meter).
A specific area used to sample vegetation (e.g., 1 square meter).
An ecological sampling unit that consists of a square frame of known area. The quadrat is used for quantifying the number or percent cover of a given species within a given area. See also transect.
An area of ground surface, often 1 m2, used as a sampling unit in population studies.
An rea of ground surface, used as a sampling unit in population studies [ edit
A square frame used to survey the composition of a particular environment and to count the number of organisms within the square