GIS terms starting with A

40 terms

  1. ACCESS directory The system directory that LIBRARIAN uses to store the files that manage access to the library.
  2. access rights The privileges accorded a user for reading, writing, deleting, updating and executing files on a disk.
  3. accessibility An aggregate measure of how reachable locations are from a given location. The ACCESSIBILITY command computes values for accessibility as a function of…
  4. accuracy, absolute The accuracy of a map in representing the geographic location of an object relative to its true location on the surface of the Earth.
  5. accuracy, relative The accuracy of a map in representing the geographic location of an object relative to the locations of other objects.
  6. Address Alias A place name which is associated with an address. Address Aliases include buildings names, historical monuments, educational facilities, and more.
  7. Address Anomaly An address whose location is illogical. The address does not follow the standard rules of Washington, DC's addressing grid system.
  8. address matching A mechanism for relating two files using address as the relate item. Geographic coordinates and attributes can be transferred from one address to the…
  9. Address Point A map point over the location of an address. Multiple address points may exist within a lot.
  10. Administrative and Other Boundaries Manmade legal boundary descriptions for the purpose of governance and management.
  11. Advisory Neighborhood Commissions (ANC) Bodies of local government in Washington DC. There are 37 ANCs. They consider a wide range of policies and programs affecting neighborhoods, including…
  12. Aerial Photography The taking of photographs from the air with a camera mounted on an aircraft.
  13. aerial triangulation The process of developing a network of horizontal and vertical position from a group of known positions using measurements taken from aerial photographs…
  14. Air Rights Lots Air right lots are established by real property tax administration to reflect a party's right to construct an improvement above an existing area of land…
  15. Allocation (1) An authorization by a designated official of a DoD component making funds available within a prescribed amount to an operating agency for the purpose…
  16. American National Standards Institute (ANSI) A national coordinator of voluntary standards activities, and an approval organization and clearinghouse for consensus standards in the United States.
  17. American Standard Code for Information Interchange (ASCII) A set of codes for representing alphanumeric information (e.g., a byte with a value of 77 represents a capital M).
  18. Analysis A process in which anything complex is separated into simple or less complex parts.
  19. annotation Adding pertinent information such as gene coded for, amino acid sequence, or other commentary to the database entry of raw sequence of DNA bases.
  20. Application Program Interface (API) An API is a set of system calls or routines for application programs to access services from operating systems or other programs.
  21. Appropriations Refers to the process of divvying out water right allotments and beneficial uses within a water management district.
  22. arc (1) Advanced Research Center, US Army, Huntsville, AL. (2) Atlantic Research Corporation.
  23. Arc Attribute Table (AAT) A table containing attributes for arc coverage features. In addition to user-defined attributes, the AAT contains the from and to nodes, the left and…
  24. Arc Code (ACODE) file An INFO data file storing arc attributes for coverages created from TIGER, DIME, IGDS and Etak files. ACODE stands for 'Arc CODE'.
  25. Arc Digitizing System (ADS) A simple digitizing and editing system used to add arcs and label points to a coverage. A command at the Arc: prompt that starts an ADS session.
  26. ARC Macro Language (AML) A high-level algorithmic language for generating end-user applications. Features include the ability to create on-screen menus, use and assign variables…
  27. ARC Standard Raster Graphic (ASRG) Raster graphic data transformed to the Equal ARC-second Raster Chart/Map (ARC) Projection System. See SRG.
  28. arc-node topology The topological data structure ARC/INFO uses to represent connectivity between arcs and nodes.
  29. archive A copy of data (any information stored on a computer) on a computer drive, or on a portion of a drive, maintained for historical reference.
  30. ArcStorm ArcStorm (ArcStorageManager) is a data storage facility and transaction manager for ARC/INFO data.
  31. ArcStorm database An ArcStorm database is a collection of libraries, layers, INFO tables and external DBMS tables.
  32. ArcTools ArcTools is a collection of ARC/INFO productivity tools implemented through an AML-based (ARC Macro Language) graphical user interface.
  33. Area Must have legally defined geographical boundaries, and may be of any size, except that the site must be a subset of the U.S.
  34. aspect The compass direction toward which a slope faces, measured in degrees from North in a clockwise direction.
  35. attractiveness The property or properties of a location that create an incentive for trips to be made to that location.
  36. attribute An attribute is a characteristic of data that sets it apart from other data, such as location, length, or type.
  37. attribute data Characteristic or descriptive information about a geographic feature (points, lines, or areas) stored in either tabular format or relational format.
  38. attribute table / DBMS table An INFO or other tabular file containing rows and columns. In ARC/INFO, attribute tables are associated with a class of geographic features, such as wells…
  39. Automated Mapping and Facilities Management (AM/FM) The management of mapping and facilities management using integrated computer software.
  40. Azimuth A direction in terms of a 360° compass. North is at 0°, east is at 90°, south is at 180°, and west is at 270°.