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Base Maps, Data or Layers
base maps, data, or layers - Spatial data sets that provide the background upon which more specific thematic data is overlaid and analyzed.

A map containing geographic features, used for locational reference.

Base Map layers are designed to contain pre-authored content, such as rasters or imagery. As a trade off for enhanced drawing and rendering performance, most geoprocessing tools cannot be used on Base Map layers.

The is the most accurate spatial database within a data system. s tend to be streets, parcels and other fundamental layers.

Base Map: The term 'base map' is used, throughout this site, to signify those GIS cartographies which chart a writer's movement through place over time.

: Map on which information would be placed for purposes of comparison. It may be used to construct other maps by the addition of information. s usually contain mapped data that seldom changes and is used repeatedly.

Base Map - A map on which information can be placed for geographical correlation. Also can be used as a "base" upon which to build other information.

: A term which varies in different applications, but, in general, refers to a map that depicts the fundamental map elements, such as streets, buildings, streams, etc., which are used frequently for locational reference.

Base Maps provide the background upon which thematic data is overlayed and analyzed.

A map containing visible surface features and boundaries, essential for locating additional layers, or types, of georeferenced information.

Base Maps
The spatial models are developed from geographic information. We used a popular desktop GIS (geographic information system) to house the spatial database. We geocoded each customer's address and the location of our store.

A map which displays planimetric and /or topographic information and which may be used as a base for a thematic layer. Features which may be included on a are: roads, rivers, major structures (buildings), contours, etc.

Base Map or Base Layer
The foundation of a GIS on which all other data layers are built. The accuracy of the base map dictates the accuracy of other data used in the GIS.


s depict fundamental information about the Earth's surface such as landforms and drainage. They also symbolize landmark features like roads, railways, populated places and buildings.

Base Map: A map containing the background upon which geographic data is overlayed and analyzed. Basic representation of a region of the earth as it would appear if viewed from above.

Basic representation of a region of the earth as it would appear if viewed from above.
Portrays basic reference information onto which other information of a specialized nature is placed.

Base map - In a GIS or digital mapping system, base map refers to those layers of map information (e.g. topography, roads, rivers and lakes) used for georeferencing layers of thematic information (e.g.

A map designed specifically to be used as a template, onto which further information is placed for the purpose of comparison or spatial correlation.

Base map printed in a dark colour (usually black or sepia)
The addition of colour by hand painting (it is interesting to note that, in haste, the artist painted the land as well as water areas around Adelaide.

data (streets, etc.)
base flood elevation lines and elevations
cross sections and letter identifiers
elevation reference marks and their elevations
floodways if not shown on the FIRM ...

base maps showing reporting zones
atlases produced for urban areas
digital products - boundary files, TIGER
E. TIGER ...

parcel- A map showing land parcels that is used as the fundamental data layer to which other data layers are referenced.

Ontario Base Map; Ontario Basic Mapping Program
Object representation ...

Figure 3. produced in ARC/INFO with 1962 aerial photograph showing the study area.

Then on the base map, over the streets and fatalities, he drew the locations of water wells.

: A set of topographic data displayed in map form providing a frame of reference or contextual information to the user.
Buffer: A polygon enclosing an area within a specified distance from a point, line or polygon.

Base map A map showing planimetric, topographic, geological, political and/or cadastral information that may appear in many different types of maps. The base map information is drawn with other types of changing thematic information.

s, data, or layers Spatial data sets that provide the background upon which more specific thematic data is overlaid and analyzed.

base map See: map, base. bathymetric map See: map, bathymetric bathymetry Science of measuring water depths (usually in the ocean) to determine bottom topography.

About Contextual s
U.S Data available on the GSD LAN
World-Wide Data Sources on the GSD LAN
Exporting Shapefile Data and Layer Information
Choosing a Projection ...

The term "base map" was at one time applied to a class of maps now known as outline maps. It may be applied to topographic maps, also termed "mother maps" that are used in the construction of other types of maps by the addition of particular data.

If the user selects the SCREEN option, then points marked on the image will automatically be associated with the coordinates from the corresponding points on the target data layer.

Using a GIS and digital versions of the 1:100,000 - scale transportation network, political boundaries, and hydrographic features, cartographers produced a 1:500,000 - scale standard base map of New Jersey.

See also: See also: Map, Information, Geographic, GIS, Location

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