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No Title Sort descending Definition
1 Data

A general term used to denote facts, numbers,letters, and symbols that refer to or describe an object, idea, condition, situation or othe factors.

2 Data capture

Operations that are required to encode data in a computer readable digital form (e.g., digitizing, scanning).

3 Data conversion

The translation of data from one storage format or media to another for the purpose of transferring it from one GIS to another. It is also the process of transforming maps from manual to digital form

4 Data Dictionary

A collection of descriptions of the data objects or items in a data model for the benefit of programmers and others who need to refer to them.

5 Data Elements

Individual items, features or components in a GIS database. Examples are streets,poles, transformers, zoning district, etc.

6 Data Elements

Individual items, features or components in a GIS database. Examples are streets,poles, transformers, zoning district, etc.

7 Data Encoding

Converting data to machine-readable format

8 Data Encoding

Converting data to machine-readable format

9 Data Model

[data structure] The two main GIS data models are rasters (grids) and vectors. Rasters are sets of pixels with a specific cell size. Vectors represent points, lines and polygons.

10 Data Set

A specific packaging of geospatial information provided by a data or software producer, also known as a feature collection, image, or coverage.

11 Data Standard

An approved model of what data should be recorded, how data should be recorded, and how data should be supported by a system in order to retain its full meaning. A standard should be a well defined set of properties or specifications for measuring acceptability, quality, and accuracy for a specific type of data which is accepted as correct by custom, consent, or authority that facilitates the creation, use, or dissemination of such data

12 Data Store

On-line or off-line repository of data sets.

13 Database

 A logical collection of interrelated information, managed and stored as a unit. A GIS database includes data about the spatial location and shape of geographic features recorded as points, lines, and polygons as well as their attributes. 

14 Database Schema

[data structure] A database schema is supported in relational database management systems (RDBMS) and acts as blueprints for how database entry will be constructed.

15 DataFinder

A one-stop-shop for finding geospatial data pertaining to the seven county Twin Cities metropolitan area. Its primary function is to facilitate sharing of GIS data among organizations and provides metadata describing GIS datasets, which can be directly downloaded or used via web services.

16 DataFinder Café

An interactive tool for viewing and downloading GIS datasets. It allows users to download datasets by user defined geographic extents or selections. The Café also allows users to browse GIS datasets, print maps, and save mapping sessions for later use or for sharing with others.

17 Dataset

A collection of related data, which is grouped or stored together.

18 Datum

The reference location from which measurements of the Earth are made. A datum defines the size and shape of the Earth and the origin and orientation of the coordinate systems used to map the Earth. Knowing the datum is important because referencing the wrong datum can result in significant error.

19 Datum

Parameter or set of parameters that serve as a reference or basis for the calculation of other parameters.

20 Datum

A set of parameters and control points used to accurately define the three dimensional shape of the Earth. The corresponding datum is the basis for a planar coordinate system. For example the North American datum, 1927 is the datum for coordinates used in Volusia County's GIS.


Database management system. DBMS sometimes refers to the software that contains and organizes the data, and sometimes refers to an organizational plan for the use of information within a single project, or within one unit or the whole of an organization.

22 Demarcation

The field measurements (e.g., land survey) that determine the physical locations of boundary markers of cadastral parcels.

23 Digital

computer-aided design, software packages designed to automate drafting of mechanical drawings

24 Digital Elevation Model (DEM)

[GIS processing] A DEM is a bare earth elevation model representing the surface of the Earth. DEMs filter out non-ground points such as bridges and trees.

25 Digital Line Graph (DLG)

[file format] DLG is vector data format developed and distributed by the United States Geological Survey (USGS). DLGs depict information about geographic features about terrain, administrative, hydrography, transportation, man-made features and more.

26 Digital Orthophotos Quadrangle (DOQ)

[file format] DOQ is a geometrically-corrected photograph produced by the USGS. Orthoimages are geometrically corrected and have an area of interest with a scale of 1:40,000. The spatial resolution is about 1 meter pixels.

27 Digital Raster Graphics (DRG)

[file format] DRG is a digital version map of USGS topographic maps. They include imagery (NAIP), roads, place names, hydrography, elevation contours and boundaries.

28 Digital Surface Model (DSM)

[file format] A digital surface model is an elevation that includes the top of buildings, tree canopy, powerlines and other features above the bare earth. For example, the first return of LiDAR consists of a DSM.

29 Digital Terrain Model (DTM)

[file format] DTM is a bare earth representation of the Earth’s surface that is augmented natural features such as ridges and breaklines.

30 Digitize

[editing] When you digitize in a GIS, you are creating geographic computer-compatible stored data with lines, points and polygons in a spatial database.

31 Digitizing

[data capture] The process of converting the geographic features on an analog map into digital format using a digitizing tablet, or digitizer, which is connected to a computer. Features on a paper map are traced with a digitizer puck, a device similar to a mouse, and the x,y coordinates of these features are automatically recorded and stored as spatial data.



32 Direct Position

Position described by a single set of coordinates within a coordinate reference system.

33 Discovery Metadata

The minimum amount of information that needs to be provided by a data supplier to convey to an inquirer the nature and content of the data resource that it holds.

34 Domain

System context: A class of systems that have similar requirements and capabilities. Application context: The body of knowledge defining the range and scope of an application in terms of elements, rules and behaviors.