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THE CARTOGRAPHIC DATA BASE IN SEEDIS

IP.com Disclosure Number: IPCOM000128307D
Original Publication Date: 1975-Dec-31
Included in the Prior Art Database: 2005-Sep-15
Document File: 10 page(s) / 38K

Publishing Venue

Software Patent Institute

Related People

Harvard H. Holmes: AUTHOR [+4]

Abstract

A geographic information syst em is comprised of many parts:~ data base man-agement systems5 inquiry and modeling systems, and so forth. A cartographic data base (CDB)i s an essential component of such a system. Such a data base provides the correspondence between geocoded data items and their geographic location. It provides the essential element in neighborhood analysis, that is, the analysis of effects which depend on adjacency or other geographical con-figuration. A CDB must be supported by subsystems for data base acquisition and editing, data base manipulation, display, and the use of the data base by analysis programs.

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THIS DOCUMENT IS AN APPROXIMATE REPRESENTATION OF THE ORIGINAL.

THE CARTOGRAPHIC DATA BASE IN SEEDIS

by

Harvard H. Holmes and Donald M. Austin

Mathematics and Computing Group Lawrence Berkeley Laboratory University of California Berkeley, California 94720

May 1975

Work done under the auspices of the Energy Research a nd Development Administration.

ABSTRACT

A geographic information syst em is comprised of many parts:~ data base man-agement systems5 inquiry and modeling systems, and so forth. A cartographic data base (CDB)i s an essential component of such a system. Such a data base provides the correspondence between geocoded data items and their geographic location. It provides the essential element in neighborhood analysis, that is, the analysis of effects which depend on adjacency or other geographical con-figuration. A CDB must be supported by subsystems for data base acquisition and editing, data base manipulation, display, and the use of the data base by analysis programs.

INTRODUCTION

A geographic data base (GDB) is any set of data containing a reference to a spatial region (i.e., points, curves,- polygons, etc.). For example, census, air pollution, weather, land use, etc., data bases have an essential geographic content. Examples of data bases without essential geographic contentare high-energy particle scattering cross-sections, bibliographic files and material properties. A cartographic data base (CDB) is-a set of-data defining geographic entities in some spatial coordinate system without regard to any other charac-teristics. These entities include points, cells, curves, polygons, polyhedra (essentially one, two and three dimensional spatial constructs). The concept can easily be extended to a fourth dimension (time) when appropriate. At Lawrence Berkeley Laboratory, this cartographic data base supports a Socio- Economic-Environmental-Demographic Information System (SEEDIS).

The primary purpose of a CDB is to allow analysis of geographic data bases. Included in the term "analysis" are the following functions:

1. Display 2. Integration (aggregation, disaggregation, combination)

3. Calculation of spatial variables (distance, area, etc.)

4. Modeling

University of California at Berkeley Page 1 Dec 31, 1975

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THE CARTOGRAPHIC DATA BASE IN SEEDIS

The display function encompasses everything from straightforward thematic (or choropleth) mapping of data on a recognizable geographic basis to more exotic techniques such as boundary distortion, symbolic overlays and perspective rendering of 3-D representations.

The integration function allows the aggregation of data to larger geographic entities (e.g., states from counties), the disaggregation to smal-ler entities and the combination of data sets referred.to different geographic entiti.es (e.g., census tracts and transportation zones). Typically, most data sets are referred only to geographic codes instead of spatial coordinates. The COB must contain the correlation betwe...