GIS terms starting with L

30 terms

  1. label point See point.
  2. Landsat Land Satellite (NASA programs satellite).
  3. Laser Imaging Detection and Ranging (LIDAR) An optical remote sensing technology which measures properties of scattered light to find range and/or other information of a distant target.
  4. latitude-longitude A spherical reference system used to measure locations on the Earth's surface. Latitude and longitude are angles measured from the Earth's center to…
  5. Lattice The regular periodic arrangement of atoms or molecules in a crystal of semiconductor material.
  6. layer A thematic set of spatial data described and stored in an ArcStorm database or a LIBRARIAN map library.
  7. layer index See cross-tile indexing.
  8. least-cost path The path, among possibly many, between two points which has the lowest traversal cost, where cost is a function of time, distance, or other user-defined…
  9. left-right topology The topological data structure ARC/INFO uses to represent contiguity between polygons. Left-right supports analysis functions such as adjacency.
  10. legend The reference area on a map that lists and explains the colors, symbols, line patterns, shadings, and annotation used on the map.
  11. LIBRARIAN Meets the informational needs of the judges and lawyers.
  12. library A collection of cells, usually bacteria or yeast, that have been transformed with recombinant vectors carrying DNA inserts from a single species.
  13. line See Groove
  14. line symbol A symbol for drawing coverage arcs.
  15. line-in-polygon A spatial operation in which arcs in one coverage are overlaid with polygons of another coverage to determine which arcs, or portions of arcs, are…
  16. linear event See event.
  17. linear feature A geographic feature that can be represented by a line or set of lines. For example, rivers, roads within a pizza delivery area, and electric and…
  18. link See Hyperlink.
  19. literal A string, a number, or a date which directly represents a constant value. 'XYZ123', '1234' and '6/10/57' are examples of a string literal, a numeric…
  20. Local Area Network (LAN) Computer data communications technology that connects computers at the same site.
  21. Location Positional information and services. For example, resources describing addresses, geodetic networks, postal zones and services, control points, and place…
  22. Location Based Services (LBS) A subset of geographic information systems (GIS) technology supporting the integration of spatial location into business processes.
  23. Log File A coverage or workspace history file containing a list of all commands used to operate on a coverage or all commands used in the workspace.
  24. logical connector One of the reserved words AND, OR and XOR used to build complex logical expressions in a query.
  25. logical expression A combination of items, system items, system variables, literals and arithmetic logical operators from which a value of TRUE or FALSE is derived; for…
  26. logical operator Another term for Boolean operator. See Boolean expression.
  27. logical selection The process of selecting a subset of features from a coverage using logical expression that operates on the attributes of coverage features (e.g.
  28. long transaction Long transactions support applications where changes to a database might span several days, weeks or months and may involve several sessions.
  29. Longitude The location east or west in reference to the Prime Meridian, which is designated as zero (0) degrees longitude.
  30. lookup table A special tabular data file containing additional attributes for features stored in an associated feature attribute table.