Interactive graphics: analytical tool for geoprocessing Page: 9 of 17
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is traced to the geographic base file. The corresponding geographic entities
are extracted to a new map file and displayed on the screen.
PTOLEMY is a system designed ito aid the researcher in the analysis of
data. The system command language is sufficiently simple that the user can
learn its operation in afew inutis. It is not. necessary to .earn a computer
The system is primarily intended to perform geographic data retrieval:
given an area, retrieve data pertaining to it. Examples may help in under-
standing the use of this facility.
1. . Determination of School Btundaries. The analyst would draw
proposed school boundaries and retrieve school population data. Alter-
ation of the boundary (search polygon) would change the school population
until a proper number is obtained.
2. Evaluation of Proposed Transportation Corridor. The analyst would
draw the proposed corridor and retrieve various data which would impact
corridor selection. The data retrieved for several alternative corridors
would provide information necssary for a decision. The content retrieval
feature is especially useful. The problem in this case is to determine
geographic patterns from known data values.
3. Plot the location of geothermal hot springs with temperatures between
1800 F and 2000 F.
4. Plot the locations of traffic speeding violations.
A by-product of the system is 'the capability to produce maps. Enlargements
of any area of a map can be made. The. same area can be selected from several
maps to produce a composite. Examples may help illustrate this facility.
1. A street repair crew may.meed a detailed map showing street segment,
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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/m1/9/: accessed June 15, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.