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ACCURACY
With regard to spatial data, the degree of conformity with a standard, whether absolute or relative. Accuracy relates to the quality of the result so that higher accuracy implies that a measurement is nearer the truth.

ANZLIC
The Australia New Zealand Land Information Council, which is the peak body for coordination of land and geographic information management in Australia and New Zealand. Each jurisdiction is represented by the chair of the jurisdictional coordination committee.

AREA
A fundamental unit of geographical information.

ATTRIBUTE
Non-graphical information associated with a point, line or area element in a LIS or GIS. For example the registered owner of a land parcel.

AUSTRALIAN GEODETIC DATUM - AGD
The framework used for coordinates in Australia since 1966. It is now being superseded by the Geocentric Datum of Australia (GDA).

CADASTRE
The public register of the land boundaries that defines the separate holdings of land.

CAVEAT
This is a dealing that is lodged on a Certificate of Title that warns anyone searching the Register that there is an interest that may prevent another dealing being registered on the Title. The Caveat alerts prospective buyers that there is a third party interest in the land must be resolved before it can be transferred (Buyer Beware).

CERTIFICATE OF TITLE
This is a page or record in the Register of Titles specifying the ownership of a defined land parcel and the lodged or registered interests or claims against that ownership. Under the Land Titles Act the Registrar-General may hold the register in any form and most Tasmanian titles are now legally held in electronic format.

CONTOUR
A line connecting points of equal elevation.

COORDINATES
Linear or angular quantities which designate the position of a point in a given reference or grid system (e.g. AMG Coordinates).

CROWN LAND
Land which may not have official tenure under land legislation and which is held and managed by the Government. The Government may licence the use of such land for specific purposes or may alienate the land by selling or leasing.

CROWN LEASE
A lease of land that can be issued under a variety of legislation and which grants the holder certain uses of the land.

DATA BASE
An organised, integrated collection of data stored so as to be usable for a variety of purposes.

DATA CAPTURE
The process of encoding data. In terms of mapping this involves digitising of analogue maps or capture of field data using electronic instruments and associating this with encoded attribute data.

DATA SET
A named collection of logically related features arranged in a prescribed manner. For example, all water features form a water data set.

DATUM
Fixed starting point for field survey, from which other survey data may be accurately compiled. Generally facts known or granted, a premise from which inferences may be drawn.

DIGITISING
The process of converting analogue maps and other sources of data to a computer readable form.

EASEMENT
This gives and individual or company a right to use or engage in some activity over land that is owned by someone else. For example, a sewerage easement to the Power and Water Authority gives PAWA certain rights.

FORMAT
The specified arrangement of data. For example this can be the layout of a document, the arrangement of data in a records or the arrangement of parts of a computer instruction.

GEOCENTRIC DATUM
A datum based on the Earth's centre of mass (or geocentre); as distinct from a regional datum, such as the AGD, whose origin does not coincide with the Earth's centre of mass.

GEOCENTRIC DATUM OF AUSTRALIA - GDA
A coordinate framework for Australia which is compatible with the Global Positioning System (GPS). The GDA was adopted by all jurisdictions in 1994 and will be implemented by the year 2000.

GEOGRAPHIC INFORMATION
Also Land Information and Spatial Information - Information that can be related to a location on, above or beneath the earth's surface, including water surfaces.

GEOGRAPHIC INFORMATION SYSTEM (GIS)
A system for capturing, storing and using data which is spatially referenced. Often the term is associated with a specific set of information technology components.

GEOREFERENCING
The process of defining the position of geographical objects relative to a standard reference grid. For example the allocation of geographical coordinates to street intersections.

GPS - GLOBAL POSITIONING SYSTEM
A satellite based navigation system developed by the United States Department of Defense and widely used for civilian navigation and positioning.

LAND
Includes the space above and below the surface.

LAND INFORMATION SYSTEM (LIS)
A system for capturing, storing and using data which is spatially referenced data. Usually not associated with specific technologies and in the NT used as the generic term for land / geographic / spatial information systems including the institutional framework and standards established to create and manage the LIS across the government and community.

LAND INFORMATION MANAGEMENT
The activity of capturing, organising, integrating, managing and distributing digital land related information and derived products for use by government and the community.

LAND PARCEL
An area of land that is uniquely defined for ownership or land use purposes. In the NT each parcel has a unique location, lot and plan identifier.

LANDSAT IMAGERY
Images produced by earth resources satellites operated by NOAA, United States. LANDSAT 5 was launched on 1 March 1994 and operates in a near polar sun synchronous orbit at an altitude of 705km. The repeat cycle is 16 days.

LAYER
A logical separation of geographical information such that each layer represents a different theme. For example a composite digital map may consist of a land boundaries layer, rivers and streams layer, roads layer, etc.

LEASE
A grant of possession of property for a number of years at specific rentals and subject to specific conditions.

LEGEND
The part of a map that is used to explain the meaning of the symbols used to depict geographical information and to provide the user with other information on the information depicted.

LICENCE AGREEMENT
With regard to digital data, a formal contract that allows the Licensee to access and use data which is "owned" by the Licensor for a fee and under a specific set of conditions.

MAP
A record, either in analogue or digital form, that describes the spatial distribution of geographical features in a specified area.

MAP PROJECTION
The representation of the spheroidal surface of the earth on a flat surface. The mathematical algorithms used to effect the transformation depend on the specific purpose required, such as preservation of shape, correct area, direction, etc.

METADATA
Information about data or data sets. Metadata is essential for the user to determine the correct use of a data set, whether in digital or analogue form. ANZLIC has defined a standard Metadata profile for use at the national level.

MORTGAGE
An agreement to repay a loan with interest over a certain period by the owner of a property to the mortgagee.

MORTGAGEE
The lender of moneys covered by the mortgage - such as a bank - to the property owner.

MORTGAGOR
The borrower who has used the property as security for the mortgage debt.

OWNERSHIP
All land is subject to tenure, which means the Crown is the ultimate owner.

PIXEL
One of a regular array of cells in a collection of raster data - a picture element. For example, the spatial accuracy of a satellite image can be described in terms of the area covered by each pixel on the ground.

POLYGON
Any area bounded by a closed line or series of lines. Thus a land parcel is also a polygon.

PROPERTY
A general term describing a person's possessions. "Real Property" refers to a piece of land owned by a person.

PSMA - PUBLIC SECTOR MAPPING AGENCIES
An intergovernmental organisation (all States and Territories and the Commonwealth) established in 1993 to deliver a single National topographic data base to the Australian Bureau of Statistics to support the 1996 Census. By 1996 PSMA had produced the first ever multi-scale nationally consistent data base which has been licensed to other organisations for a range of purposes.

RASTER DATA
Data expressed as an array of pixels with spatial position implicit in the ordering of the pixels.

RASTER MAP
A map encoded in the form of a regular array of cells.

RASTER TO VECTOR
The process of converting an image made up of cells into one described by lines and polygons.

RECORD
A set of related contiguous data in a computer file.

REMOTE SENSING
The technique of obtaining data about the environment and the earth from a distance - e.g. from aerial photography or satellites.

SATELLITE IMAGERY
Images of the earth taken from orbiting satellites. Images can be taken in a variety of forms so as to detect specific information about the earth, vegetation and other types of land cover.

SCALE
The relationship between the size of an object on a map and its size in the real world.

SCANNING
The process of digitising whereby an image or map is automatically detected and most of its attributes are converted into digital data in raster form. Subsequently a process can be applied whereby the raster data is converted to vector form and any remaining attributes also captured or more clearly defined.

SEARCH
The common term used to describe the process of obtaining details about a piece of land by examining documents (e.g. a title search, a tenure status search).

SPATIAL INFORMATION
Information which includes a reference to a two or three dimensional position in space as one of its attributes.

SUBDIVISION
The process whereby a parcel of land is divided into two or more parcels or alternatively multiple parcels are consolidated into one or more parcels.

SURVEYING
The measurement of dimensions (contour, position, boundaries, area, height etc.) of any part of the earth's surface (land or water) or any cultural feature. Depending on the type of survey undertaken and the degree of accuracy required, "surveys" may involve the application of the theory, principles and techniques of geodesy, photogrammetry and cartography.

SURVEY PLAN
A plan prepared by a Licensed Surveyor from field survey data and previous survey plan data according to standards and directions of the Surveyor-General.

TENURE
Tenure is the system of holding land or property. It does not equate to ownership since, unlike goods, land cannot be possessed by one person in absolute ownership.THEME A data layer relating to a specific subject or topic of interest.

THEMATIC MAP
A map depicting one or more specific themes - e.g. land use, rainfall, land tenure.

TILE
A part of a geographic data base that depicts a specific area of the earth's surface. Many geographic data bases are arranged in tiles or digital map sheets to enhance computer performance and easy of use. Increasingly geographical data bases are arranged in "seamless" form so that tiles become irrelevant.

TOPOGRAPHIC MAP
A map showing the features on the earth's surface in accuracy and details appropriate to the map scale. A standard topographic maps will show a number of different themes of data - e.g. contours, water features, cultural features (roads, buildings, etc).

TOPOGRAPHIC DATA BASE
A data base in which data relating to the earth's physical features on the earth's surface is held and managed.

TOPOLOGY
The properties of and relationships between the lines, points and polygons that make up a geographical data set - the way in which geographical elements are linked together.

TORRENS SYSTEM
The system of land titles registration used throughout Australia. The system simplifies the registration of land dealings and guarantees the Title of a land owner. It ensures that anyone only has to search the original Certificate of Title to ascertain all of the registered interests in the land.

TRANSFER
Refers to the transfer of the Certificate of Title from one owner to another as a result an agreement or the sale of the land or property included in the Title.

VECTOR DATA
Positional data in the form of coordinates of the ends of line segments, points, text position, etc.