SDF may refer to:

Computing

File formats

Spatial Data File The Spatial Data File (SDF) is a single-user geodatabase file format developed by Autodesk. The file format is the native spatial data storage format for Autodesk GIS programs MapGuide and AutoCAD Map 3D. SDF format version SDF3 (based on SQLite ...

, for geodatabases * Standard Delay Format, for timing data * SQL Server Compact Edition Database File (filename extension: .sdf) * Structure data file, for chemical tables * Scientific Data Format, a

Hierarchical Data Format Hierarchical Data Format (HDF) is a set of file formats (HDF4, HDF5) designed to store and organize large amounts of data. Originally developed at the U.S. National Center for Supercomputing Applications, it is supported by The HDF Group, a non- ...

implementation

Formal computer science

Signed distance function In mathematics and its applications, the signed distance function or signed distance field (SDF) is the orthogonal distance of a given point ''x'' to the boundary of a set Ω in a metric space (such as the surface of a geometric shape), with t ...

(or field), in mathematical applications *

Syntax Definition Formalism The Syntax Definition Formalism (SDF) is a metasyntax used to define context-free grammars: that is, a formal way to describe formal languages. It can express the entire range of context-free grammars. Its current version is SDF3. A parser and parse ...

, to describe formal languages

Other uses in computing

* Software development folder, a physical or virtual container for software project artifacts *

Synchronous Data Flow Synchronous Data Flow (SDF) is a restriction on Kahn process networks where the number of tokens read and written by each process is known ahead of time. In some cases, processes can be scheduled such that channels have bounded FIFOs. Limitati ...

, a restriction of Kahn process networks *

SDF Public Access Unix System Super Dimension Fortress (abbreviated as ''SDF'', also known as freeshell.org) is a non-profit public access UNIX shell provider on the Internet. It has been in continual operation since 1987 as a non-profit social club. The name is derived from ...

, a shared shell provider

Entertainment and media

* Südtirol Digital Fernsehen, a TV station in South Tyrol, Italy * Super Dimensional Fortress, warships in the

Robotech ''Robotech'' is an American-Japanese science fiction Media franchise, franchise that began with an 85-episode anime television series produced by Harmony Gold USA in association with Tatsunoko Production; it was first released in the United St ...

Macross is a Japanese science fiction mecha anime media franchise/ media mix, created by Studio Nue (most prominently mecha designer, writer and producer Shōji Kawamori) and Artland in 1982. The franchise features a fictional history of Earth and t ...

franchise * Settlement Defense Front (SDF), an enemy faction of '' Call of Duty: Infinite Warfare''

Organizations

Military forces

Japan Self-Defense Forces The are the military forces of Japan. Established in 1954, the JSDF comprises the Japan Ground Self-Defense Force, the Japan Maritime Self-Defense Force, and the Japan Air Self-Defense Force. They are controlled by the Ministry of Defense ...

State defense force In the United States, state defense forces (SDFs) are military units that operate under the sole authority of a State governments of the United States, state government. State defense forces are authorized by state and federal law and are unde ...

, US *

Sudan Defence Force The Sudan Defence Force (SDF) was a British Colonial Auxiliary Forces unit raised in the Anglo-Egyptian Sudan in 1925 to assist local police in internal security duties and maintain the condominium's territorial integrity. During World War II, ...

, 1925–1955 *

Syrian Democratic Forces The Syrian Democratic Forces (SDF) is a Kurds in Syria, Kurdish-led coalition of U.S.-backed Left-wing politics, left-wing ethnic militias and rebel groups, and serves as the official military wing of the Democratic Autonomous Administration ...

, North and East Syria

Political parties

Sikkim Democratic Front Sikkim Democratic Front (SDF) is a regional political party in the Indian state of Sikkim. It was the ruling party in Sikkim from 12 December 1994 to 23 May 2019. History The party was founded by Pawan Kumar Chamling in 1993. It has ruled the ...

, India * Social Democratic Federation (United States), 1936–1956 *

Social Democratic Federation The Social Democratic Federation (SDF) was established as Britain's first organised socialist political party by H. M. Hyndman, and had its first meeting on 7 June 1881. Those joining the SDF included William Morris, George Lansbury, James ...

, UK, 1884–1911 * Social Democratic Forum, Hong Kong, 2000 * Social Democratic Front (disambiguation), Cameroon and Ghana *

Socialist Democratic Federation (Japan) The (SDF), also referred to in Japanese by the shortened , was a Japanese political party that existed from 1978 to 1994. It was formed from the merger of the and the . History The Socialist Democratic Federation was a splinter party of th ...

, 1978–1994

Other organizations

* Scouts de France, youth group *

Serb Democratic Forum Serb Democratic Forum (, Српски демократски форум) is a non-governmental organization of the Serbs of Croatia, which in cooperation with national and international organizations and institutions, protects human rights, minor ...

, Serbs of Croatia * Search Dog Foundation, rescue dog training organization

Places

Louisville International Airport Louisville Muhammad Ali International Airport — also known by its former official names as Standiford Field and Louisville International Airport — is a civil-military airport in Louisville in Jefferson County, Kentucky. The airport was ...

, Kentucky, US (by IATA code) * Soquel Demonstration State Forest, California, US

Science

Silver diammine fluoride Silver diammine fluoride (SDF), also known as silver diamine fluoride in most of the dental literature (although this is a chemical misnomer), is a topical medication used to treat and prevent dental caries (tooth decay) and relieve dentinal hyp ...

, in dentistry * Stromal cell-derived factor (disambiguation), SDF1, SDF1a, etc. *

Subwavelength-diameter optical fibre A subwavelength-diameter optical fibre (SDF or SDOF) is an optical fibre whose diameter is less than the wavelength of the light being propagated through it. An SDF usually consists of long thick parts (same as conventional optical fibres) at both ...

* Synchronous diaphragmatic flutter or hiccup

Other uses

SDF Group SDF Group is an Italian agricultural machinery manufacturer founded in 1927 and with its headquarters in Treviglio (Bergamo), Italy. SDF is one of the world's leading manufacturers of tractors, combine harvesters, and diesel engines. The group's ...

(SAME Deutz-Fahr), an Italian-based agricultural machine manufacturer *

Simplified directional facility Simplified directional facility (SDF) was a localizer-based instrument non-precision approach to an airport, which provided final approach course similar to instrument landing system (ILS) and localizer type directional aid (LDA) approaches, al ...

, an aviation instrument approach navigational aid *

Stochastic discount factor The concept of the stochastic discount factor (SDF) is used in financial economics and mathematical finance. The name derives from the price of an asset being computable by "discounting" the future cash flow \tilde_i by the stochastic factor \tilde ...

, in econometrics {{disambiguation