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 It has been superseded by the USGS's own SDTS format but the format remains popular due to large numbers of legacy files, self-containment, relatively simple field structure and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

Pick

Pick may refer to:

Brands

Music

People

Places

Political parties

Sports and games

Pick (hieroglyph)

The ancient Egyptian Pick hieroglyph, Gardiner sign listed nos. U17, U18 is a portrayal of a 'pick upon the side view of a block'; it is in the Gardiner subset for agriculture, crafts, and professions.

In the Egyptian language, the pick hieroglyph is used as an ideogram or determinative for grg, the verb "to pick through", or for other related words.

Verb: to settle, found, establish; (also dismantle)

Example usage: 24th century BC, Palermo Stone

From circa 2392 BC (24th to 23rd century BC), the Palermo Piece-(obverse) of the 7—piece Palermo Stone contains two uses of the pick hieroglyph. They occur as a pair in Row III (of VI rows) for a "King Year Register" for Pharaoh, King Den.

See also

References

Plectrum

A plectrum is a small flat tool used to pluck or strum a stringed instrument. For hand-held instruments such as guitars and mandolins, the plectrum is often called a pick, and is a separate tool held in the player's hand. In harpsichords, the plectra are attached to the jack mechanism.

Plectra wielded by hand

Guitars and similar instruments

A plectrum (pick) for electric guitars, acoustic guitars, bass guitars and mandolins is typically a thin piece of plastic or other material shaped like a pointed teardrop or triangle. The size, shape and width may vary considerably. Thin items such as small coins, bread clips or broken compact discs and credit cards can be used as substitute plectra. Banjo and guitar players may wear a metal or plastic thumb pick mounted on a ring, and bluegrass banjo players often wear metal or plastic fingerpicks on their fingertips. Guitarists also use fingerpicks.

Guitar picks are made of a variety of materials, including celluloid, metal, and rarely other exotic materials such as turtle shell, but today delrin is the most common . For other instruments in the modern day most players use plastic plectra but a variety of other materials, including wood and felt (for use with the ukulele) are common. Guitarists in the rock, blues, jazz and bluegrass genres tend to use a plectrum, partly because the use of steel strings tends to wear out the fingernails quickly, and also because a plectrum provides a more 'focused' and 'aggressive' sound. Many guitarists also use the pick and the remaining right-hand fingers simultaneously to combine some advantages of flat picking and finger picking. This technique is called hybrid picking.