estimating distance

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• Distance sampling — is a widely used group of closely related methods for estimating the density and/or abundance of populations. The main methods are line transects and point transects. On line reference Encyclopedia of Environmetrics Program DISTANCE software… …   Wikipedia

• Cosmic distance ladder — * Light green boxes: Technique applicable to star forming galaxies. * Light blue boxes: Technique applicable to Population II galaxies. * Light Purple boxes: Geometric distance technique. * Light Red box: The planetary nebula luminosity function… …   Wikipedia

• Optimum HDTV viewing distance — is the distance that provides the viewer with the optimum immersive visual HDTV experience. Although opinions vary on the exact screen size to distance relationship, formal research and recommendations suggest closer is preferred to further[not… …   Wikipedia

• Mahalanobis distance — In statistics, Mahalanobis distance is a distance measure introduced by P. C. Mahalanobis in 1936.[1] It is based on correlations between variables by which different patterns can be identified and analyzed. It gauges similarity of an unknown… …   Wikipedia

• Unit distance graph — In mathematics, and particularly geometric graph theory, a unit distance graph is a graph formed from a collection of points in the Euclidean plane by connecting two points by an edge whenever the distance between the two points is exactly one.… …   Wikipedia

• nebula — nebular, adj. /neb yeuh leuh/, n., pl. nebulae / lee , luy /, nebulas. 1. Astron. a. Also called diffuse nebula. a cloud of interstellar gas and dust. Cf. dark nebula, emission nebula, reflection nebula …   Universalium

• Rindler coordinates — In relativistic physics, the Rindler coordinate chart is an important and useful coordinate chart representing part of flat spacetime, also called the Minkowski vacuum. The Rindler chart was introduced by Wolfgang Rindler. The Rindler coordinate… …   Wikipedia

• Coordenadas de Rindler — En física relativista, la carta de coordenadas de Rindler es una importante y útil carta de coordenadas representando parte del espaciotiempo plano, también llamado el vacío de Minkowski. La carta de Rindler fue introducida por Wolfgang Rindler.… …   Wikipedia Español

• Subminiature photography — is the practice of using unusually small cameras with unusually small film formats to make photographs. OverviewThe exact boundary between cameras and formats that are subminiature and those that are merely small is the subject of debate among… …   Wikipedia

• Manual focus — In the field of photography, a manual focus camera is one in which the operator has to adjust the focus of the lens by hand. Before the advent of autofocus, all cameras had manually adjusted focusing; thus, the term is a retronym. The focus… …   Wikipedia

• Vision in toads — The neural basis of prey detection, recognition, and orientation was studied in depth by Jörg Peter Ewert in a series of experiments that made the toad visual system a model system in neuroethology (neural basis of natural behavior). He began by… …   Wikipedia