USGS DEM

The USGS DEM standard is a geospatial file format developed by the United States Geological Survey for storing a raster-based digital elevation model. It is an open standard, and is used throughout the world. It has been superseded by the USGS's own SDTS format but the format remains popular due to large numbers of legacy files, self-containment, relatively simple field structure and broad, mature software support.

DEM Level

A USGS DEM can be classified into one of four levels of quality. This is due to the multiple methods of data collection, and certainty in the data.

Format Structure

The USGS DEM format is a self-contained (single file) set of ASCII-encoded (text) 1024-byte (1024 ASCII chars) blocks that fall into three record categories called A, B, and C. There is no cross-platform ambiguity since line ending control codes are not used, and all data including numbers is represented in readable text form. There is no known binary analogue of the format, although it is common practice to compress the files with gzip.

Demai (Talmud)

Demai (Hebrew: דמאי‎) is the third tractate of Seder Zeraim ("Order of Seeds") of the Mishnah and of the Talmud. There is some debate as to the literal meaning and origin of the word. It is concerned mainly with laws related to produce where it is suspected that ma'aser rishon (the first tithe for the Levi), terumat ma'aser and ma'aser sheini (the second tithe) or ma'aser ani (the tithe for the poor), depending on the year of the Shemittah cycle, have not been properly separated in accordance with Num. 18:24-28. It consists of seven chapters and has a Gemara from only the Jerusalem Talmud.

DEM (disambiguation)

DEM was the ISO 4217 currency code for the Deutsche Mark, former currency of Germany.

DEM or Dem can also refer to:

Computing

Organisations

Other uses

Kerið

Kerið (occasionally Anglicized as Kerith or Kerid) is a volcanic crater lake located in the Grímsnes area in south Iceland, on the popular tourist route known as the Golden Circle. It is one of several crater lakes in the area, known as Iceland's Western Volcanic Zone, which includes the Reykjanes peninsula and the Langjökull Glacier, created as the land moved over a localized hotspot, but it is the one that has the most visually recognizable caldera still intact. The caldera, like the other volcanic rock in the area, is composed of a red (rather than black) volcanic rock. The caldera itself is approximately 55 m (180 ft) deep, 170 m (560 ft) wide, and 270 m (890 ft) across. Kerið’s caldera is one of the three most recognizable volcanic craters because at approximately 3,000 years old, it is only half the age of most of the surrounding volcanic features. The other two are Seyðishólar and Kerhóll.

While most of the crater is steep-walled with little vegetation, one wall is sloped more gently and blanketed with a deep moss, and can be descended fairly easily. The lake itself is fairly shallow (7–14 metres, depending on rainfall and other factors), but due to minerals from the soil, is an opaque and strikingly vivid aquamarine.

Keri

Keri (קרי) is a Hebrew term which literally means "happenstance", "frivolity" or "contrariness" and has come to mean "seminal emission". The term is generally used in Jewish law to refer specifically to the regulations and rituals concerning the emission of semen, whether by nocturnal emission, or by sexual activity. By extension, a man is said to be a ba'al keri (בעל קרי) ("one who has had a seminal emission") after he has ejaculated without yet completing the associated ritual cleansing requirements.

Hebrew Bible

The biblical regulations of the Priestly Code specify that a man who had experienced an emission of semen would become ritually impure, until the evening came and the man had washed himself in water; (Leviticus 15:16) any clothes or bits of skin which the semen came into contact with would also become ritually impure, until they had been washed in water and the evening had come. (Leviticus 15:17) The code adds that if the emission of semen occurred during sexual intercourse with a woman, then the woman would also become ritually impure, until the evening had come and she had washed herself in water. (Leviticus 15:18)

Keri (disambiguation)

Keri or KERI may refer to:

Given name