Interactive graphics: analytical tool for geoprocessing Page: 7 of 17
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the geographic retrieval and data linkage requirements of the system. The
system operates in a highly responsive mode using terminals to communicate to
the central computer. The county relies upon their system to access computer-
ized maps and data files and to coordinate the data to answer vital questions
concerning , building :permits and. various other appl.,ications..-
Overview of the PTOLEMY System
PTOLEMY is being developed as an interactive computer graphics program
to manage geographic-related information. The function of the system is to
retrieve information according to specifications supplied interactively by
the researcher. The researcher enters commands using the keyboard and light
pen. Maps are viewed on the display screen. Data listings are produced either
on a line printer or on an electrostatic printer. Hardcopy of the maps
- viewed on the display screen can be produced either on an electrostatic printer
or on a mechanical plotter.
The PTOLEMY system operates on a data base which contains a geographic
base fileand other special data files relating to the field of application.
The geographic base file contains the cartographic data which supports the
map display and manipulation capability. The cartographic data consists
primarily of point and polygon descriptions of geographic entities. These
data are linked to the special data in the application files.
PTOLEMY specializes in geographic data retrieval using the polygon
overlap method. The'researcher requests a map from the data base to be dis-
played on the display screen. Then he uses the light pen to draw a search
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Hill, E.R. Interactive graphics: analytical tool for geoprocessing, article, January 1, 1973; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc1058972/m1/7/: accessed May 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.