Theses on Data Models
Lieke Verhelst
Investigating the aspects of point type sensor data
This research investigated the relevant aspects of point type sensor data (such as size of data file, use of the time value, use of location value), recorded as (id, x, y, z, measurement value, t) that influence the eventual database implementation (index type, data type, data model, query language). It aims to find (a) modelling method(s) to describe in an unbiased way the procedure to select the optimal database implementation for a set of aspects. The set of aspects is usually imposed by the person that studies the sensor data, because this person is looking for a specific result (e.g. pattern, selection, join).
This thesis work addresses this problem by designing a prototype of an expert system that
automatically makes the selection of an appropriate technical solution based on information entered by the user of sensor data. For the design of this prototype, techniques coming from Geo Information science are combined with those from Artificial Intelligence and Computer Science. The Artificial Intelligence techniques used are the building of an ontology and the use of a reasoning system and rule engine. Both solutions were implemented and this resulted in two prototypes, the JessTabDemo and the ReasonerDemo. The capabilities of the two prototypes were evaluated against the predefined prototype requirements.
Supervisors:
Professor: Dr. Ir. Peter van Oosterom (Wageningen University)
Supervisor(s): Dr. Wilko Quak (TU Delft)
Reviewer: Drs. Arend Langenberg (Wageningen University)
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Frans Cortenbach
Application of the Aquo Standard in the Dutch Water Sector,
Towards an Aquo Conformity Assessment Approach
The combined group of Dutch water management institutions decided to start with a central
independent Information Desk standards Water (IDsW) to coordinate the efforts on standardization and exchangeability of data in the sector.
Having established the technical dimension of the national water standard “AQUO”, the next challenge for IDSW is the adoption of the standard by the participating partners and other organizations in the water sector.
This research supports IDSW in their plans for the development of an assessment tool that provides insight in the status of the application of the AQUO standard in an organization with regard to geoinformation exchange, related processes and de capability of organizations to maintain the AQUO standard on the long run.
A set of workable procedures has been developed that can be applied in any organization in the water sector, that provide a score for the status of AQUO conformity within an acceptable timeframe. The Aquo conformity assessment is at three levels: Geo-data exchange files (XML validation), geoapplications (vendor assessment) and Aquo relevant management practices (questionnaire for internal assessment by organizations’ staff/employees).
Supervisors:
Professor: Prof. Arnold Bregt (Wageningen University)
Supervisor(s): Dr. Pepijn van Oort (Wageningen University)
Reviewer: Drs. Fred Toppen (Utrecht University)
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Jan van Bennekom-Minnema
The Land Administration Domain Model Survey Package and Model Driven Architecture
The Land Administration Domain Model (LADM) is a UML model of object classes of land registration and cadastre. Model Driven Architecture (MDA) is a software design methodology to create model based specifications and generation of information systems.
The objective of the master thesis project is twofold:
To establish an extension of the LADM with regard to its Survey Package; by performing a literature study, and by investigating a case from Kadaster ("Registration Map Quality" project). To gain experience with MDA; by performing a literature study, and by creating a prototype of the extended LADM Survey Package, based on MDA principles.
Supervisors:
Professor: Peter J.M. van Oosterom, TUD
Supervisor 1: Christiaan H.J. Lemmen, ITC
Supervisor 2: Klaas van der Hoek, Kadaster
Supervisor 3: Ir. Joop van Buren, Kadaster
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Thesis defence Jan van Bennekom (video)
Sijmen Wesselingh
Visualisation of 3D tetrahedra in a web client
A TEN stands for Tetrahedral Irregular Network. A tetrahedron is the simplest geometrical form in 3D, a pyramid with a triangular ground face. Its four points can lie anywhere in the 3D space as long as they do not lie on one flat plane. Objects in the 3D space can be described as a set of bounding polygons. The polygons can be triangulated, when the surface is closed you have a 3D TIN. When you tetrahedronize the volume inside the triangulated surface you get a TEN. First order the thesis described related theory of 3D geo-information including a detailed description of the TEN, 3D TIN and ‘TEN View’, secondly theory related to the development of the prototype that has been created for this thesis is given, and thirdly a review of similar prototypes for the visualization of 3D geo-information on the web which have been created in the past is made and a description of the preliminary and realized architecture of the prototype that has been created is given. Last but not least there is a results chapter with detail about the used techniques and pictures of the prototype at work. Finally a
conclusion is drawn.
Supervisors:
Professor: Peter van Oosterom, TUDelft
Supervisors: Marian de Vries, Friso Penninga, TUDelft
Reviewer: Pepijn van Oort (WUR) (Barend Kobben, ITC)
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