Overlaying

Refers to the techniques used to produce a geometric intersection between two sets of data to highlight features of interest. Overlaying is often used when studying or displaying maps. Specifically, the term ‘overlaying’ refers to the use of vector data. A similar method called ‘data extraction’ is performed using raster data.

The process of overlaying consists of putting two maps of the same region (the input data) to produce an effect similar to a Venn diagram, as used in statistics (the output data). This can be achieved in several different ways:

  • Union overlay: the inputs are combined into a single new output
  • Intersect overlay: the area where the inputs overlap is defined, and the output retains a set of attribute fields for each individual input area
  • Symmetric difference overlay: the output area contains the areas from both inputs, but not the area where they overlap

Overlays can used to designate particular points on a map. These points specifically relate to a set of coordinates that matches those on the ground, which means that they continue to point to the exact place even when the map is resized. Points can be joined to form lines or polygons, to highlight specific areas of interest.

These different types of overlaying can be performed using specialist Geographic Information Systems (GIS) software.

Related methods include: 2d Modelling-raster, 2d Modelling-vector, Geo-referencing and projection, and Photogrammetry.

tool: FocusOPEN Digital Asset Manager

Open source Digital Asset Management solution designed for medium size preservation, cataloguing, media archiving and batch transcoding.
Methods relating to this toolCategory
AnimationPractice-led research
Cataloguing and indexingData structuring and enhancement
Collaborative publishingData publishing and dissemination
CollatingData analysis
Content analysisData analysis
CurationStrategy and project management
Data miningData analysis
General project managementStrategy and project management
Graphical interaction (synchronous)Communication and collaboration
Graphical renderingData structuring and enhancement
Image feature measurementData analysis
Image manipulationPractice-led research
Image segmentationData analysis
IndexingData analysis
Manual input and transcriptionData capture
OverlayingData analysis
PhotographyPractice-led research
PreservationStrategy and project management
Record linkagesData structuring and enhancement
Resource sharingCommunication and collaboration
Server scriptingData publishing and dissemination
Statistical analysisData analysis
Streaming mediaData publishing and dissemination
Text encoding - presentationalData structuring and enhancement
Text encoding - referentialData structuring and enhancement
Text miningData analysis
Text recognitionData capture
Textual interaction (asynchronous)Communication and collaboration
Textual interaction (synchronous)Communication and collaboration
Use of existing digital dataData capture
User contributed contentData publishing and dissemination
Video and moving image compressionData structuring and enhancement
Video editingPractice-led research
Video post productionPractice-led research
Video-based interaction (asynchronous)Communication and collaboration
Lifecycle stage:

tool: ERDAS Imagine

ERDAS Imagine is a suite of geospatial authoring software. The suite contains a raster graphics editor and remote sensing application that performs advanced remote sensing analysis and spatial modelling to create new information. ERDAS IMAGINE can also visualize results in 2D, 3D, movies, and on cartographic quality map compositions.
Features: 
Licence:
Methods relating to this toolCategory
2d illustrationPractice-led research
2d modelling - rasterData structuring and enhancement
2d modelling - vectorData structuring and enhancement
3d modelling - interactiveData structuring and enhancement
3d modelling - vectorData structuring and enhancement
3d modelling - vectorPractice-led research
AnimationData structuring and enhancement
Content analysisData analysis
Desktop publishing and pre-pressData publishing and dissemination
DocumentationStrategy and project management
Geo-referencing and projectionData structuring and enhancement
GPS and total station surveysData capture
Human factors analysisStrategy and project management
OverlayingData analysis
Remote sensingData capture
Resource sharingCommunication and collaboration
Statistical analysisData analysis
Video-based interaction (asynchronous)Communication and collaboration
VisualisationData analysis
Alternate tool(s):

SPRING, Virtual Terrain Project (VTP),

tool: ArcGIS

ArcGIS is a suite of software that comprises of Desktop GIS, Server GIS, Mobile GIS, and Online GIS. ArcGIS is a platform for building a complete geographic information system (GIS) that lets you easily create, edit, and analyse geographic knowledge on the desktop; publish data, maps, globes and models to a GIS server and/or share them online; and use them on the desktop, on the Web, or in the field.
Features: 
Suite:
Licence:
Methods relating to this toolCategory
2d modelling - rasterData structuring and enhancement
2d modelling - vectorData structuring and enhancement
3d modelling - interactiveData structuring and enhancement
3d modelling - vectorData structuring and enhancement
3d modelling - vectorPractice-led research
Audio-visual interaction (synchronous)Communication and collaboration
Cataloguing and indexingData structuring and enhancement
Collaborative publishingData publishing and dissemination
CollatingData analysis
Content analysisData analysis
Desktop publishing and pre-pressData publishing and dissemination
Disk publishingData publishing and dissemination
DocumentationStrategy and project management
Geo-referencing and projectionData structuring and enhancement
Geophysical surveyData capture
GPS and total station surveysData capture
Graphical interaction (synchronous)Communication and collaboration
Graphical renderingData structuring and enhancement
IndexingData analysis
OverlayingData analysis
Resource sharingCommunication and collaboration
Resource sharingData publishing and dissemination
Spatial data analysisData analysis
VisualisationData analysis
Alternate tool(s):

GRASS (Geographic Analysis Support System) GIS, ThinkGeo

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