Geo-referencing and projection

Geo-referencing is a technique used to convert images from image coordinates to real-world coordinates to establish spatial locations of geographical features in terms of map projections or coordinate systems. It can also be used to establish the relation between raster or vector images and coordinates.

This method would be used when producing a new map, analysing changes in features over a period of time, or linking together two or more different datasets that refer to the same geographic locations. Some examples include establishing the correct position of an aerial photograph within a map or finding the geographical coordinates of a place name or street address.

A projection is a mathematical means of transferring information from a model of the Earth, a three-dimensional curved surface, to the two-dimensional medium of paper or a computer screen. Different types of projection suit different uses. For example, a projection that accurately represents the shapes of the continents will distort their relative sizes.

Related methods include: 2D Modelling – raster, 2D Modelling – vector, Overlaying, Photogrammetry and Record linkages.

tool: GDAL

Geospatial Data Abstraction Library (GDAL) is a translator library for vector and raster geospatial data formats that is released under an X/MIT style Open Source license by the Open Source Geospatial Foundation.
Methods relating to this toolCategory
Geo-referencing and projectionData structuring and enhancement
Geophysical surveyData capture
GPS and total station surveysData capture
Manual input and transcriptionData capture
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