Urban Studies and Planning Commons^™

Modeling Cadastral Spatial Relationships, Kenneth Dueker, Daniel Kjerne

Center for Urban Studies Publications and Reports

Research exploring the object-oriented paradigm as a tool with which to model location of objects in maps is reported. The research led us into three areas:

• the use of an object-oriented language, Smalltalk.-80 to model cadastral location using the object-oriented paradigm.
• study of the development of spatial information systems, such as engineering design and computer-aided design(CAD) database systems based on object-oriented ideas, to see how that approach might be useful for developing a mapping system.
• Finally, the conceptual exploration of how an object-oriented approach might facilitate linkages of location among layers of a land information system.

Future research is needed …

User Needs Assessment And Technical Issues For A Multipurpose Cadastre For Multnomah County, Oregon, Kenneth Dueker, Larry Conrad, Daniel Kjerne

Center for Urban Studies Publications and Reports

The objectives of this study are: 1) to provide the County Assessor with a survey of the current usage of the assessor's mapping system ; 2) to assess the future data needs of the users based upon implementation of the assessor's plans for a computerized cadastral mapping system, or multipurpose cadastre (MPC}; 3) to identify the locational accuracy requirements of the proposed mapping system; and 4) to identify a strategy to facilitate gradual improvement in accuracy of locational data.

Modeling Location For Cadastral Maps Using An Object-Oriented Computer Language, Daniel Kjerne

Center for Urban Studies Publications and Reports

The challenge to designers of multipurpose computer-aided land information systems is to capture enough of the "deep structure" of the problem domain to enable a system to answer user questions and requests in a satisfactory way. Criteria defining "satisfactory" in each case must include considerations of accuracy, completeness, timeliness, and cost. These considerations, when applied to the location in space of parcel boundaries and property corners, present unusual difficulties. This is in large measure due to the fact that important elements of the field measurement process, and the determination of location based on what are essentially logical {legal) abstractions, are …