Figure 4.1 Analogue and digital data
Figure 4.2 Data sources
Data Capturing Methods ...
Digitize A means of converting or encoding map data that are represented in analogue form into digital information of x and y coordinates.
htm#52 Analogue maps digitized by scanning. The data structure of scanned maps is raster. schema A structured framework. A metadata schema specifies the order and types and labels of information elements describing a geodata set.
September 1 - Finland switches off all of its analogue terrestrial television signals as part of the digital switchover.
September 2-September 9 - The Asia-Pacific Economic Cooperation hosts its 19th annual city meeting in Sydney.
The production of ortho-photography often utilizes elevation data obtained by conventional means, usually analogue or analytical photogrammetry, converted into digital form (Petrie, 1995).
analogue image-An image where the continuous variation in the property being sensed is represented by a continuos variation in image tone.
Its origin is unknown, though it has an obvious analogue in the azimuthal gnomonic projection.
The preceding sections of this article deal with the complex plane as the geometric analogue of the complex numbers.
The process of converting data from analogue paper maps into computer files is called digitizing. Modern GIS technology has the capability to automate this process fully for large projects; smaller jobs may require some manual digitizing.
Tomlinson, R.F., 1988. "The impact of the transition from analogue to digital cartographic representation," American Cartographer 15:249-62. An overview from a pioneer of GIS.
EXAM AND DISCUSSION QUESTIONS ...
This City of Düsseldorf map was the first to be created and stored digitally. The map was created from analogue data.
The Vector Smart Map (VMap) family of databases is a set of digital vector product databases oroginally used for military IT, simulation- and geoinformation systems as well as for the production of military analogue and digitalmaps.
 See also: Analog, Information, Mapping, Digital, Area
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