Managing bias and unfairness in data for decision support: a survey of machine learning and data engineering approaches to identify and mitigate bias and unfairness within data management and analytics systems

The increasing use of data-driven decision support systems in industry and governments is accompanied by the discovery of a plethora of bias and unfairness issues in the outputs of these systems. Multiple computer science communities, and especially machine learning, have started to tackle this problem, often developing algorithmic solutions to...

Using a Space Filling Curve for the Management of Dynamic Point Cloud Data in a Relational DBMS

The rapid developments in the field of point cloud acquisition technologies have allowed point clouds to become an important source of information for many applications. One of the newest applications of point clouds concerns the monitoring of the coast. Many countries, among which the Netherlands, use this source of data in order to determine...

Comparative analysis of data structures for storing massive tins in a DBMS

Point cloud data are an important source for 3D geoinformation. Modern day 3D data acquisition and processing techniques such as airborne laser scanning and multi-beam echosounding generate billions of 3D points for simply an area of few square kilometers. With the size of the point clouds exceeding the billion mark for even a small area,...

Using a space filling curve approach for the management of dynamic point clouds

Point cloud usage has increased over the years. The development of low-cost sensors makes it now possible to acquire frequent point cloud measurements on a short time period (day, hour, second). Based on the requirements coming from the coastal monitoring domain, we have developed, implemented and benchmarked a spatio-temporal point cloud data...

Solid CAD Geometries in a Spatial DBMS: An Application in the Petrochemical Industry

Fugro GeoServices is currently storing their CAD models of the Petrochemical Industry as attributes of 2D lines in a spatial DBMS. This solution works well for web visualization, but not for performing analyses in 3D. The main objective of this graduation project is to create a 3D spatial DBMS with solid CAD geometries as input. The difficulty...

Storing Massive TINs in a DBMS: A comparison and a prototype implementation of the multistar approach

Solutions have been introduced to handle massive point clouds in Database Management Systems (DBMS), namely by Oracle in 2011 and postgreSQL in 2013. Many common operations on these massive point clouds require knowledge about the original surface in order to analyse them. A possible method to recreate a representation of the original surface is...

An approach to develop 3d Geo-DBMS topological operators by re-using existing 2d operators

Database systems are continuously extending their capabilities to store, process and analyse 3D data. Topological relationships which describe the interaction of objects in space is one of the important spatial issues. However, spatial operators for 3D objects are still insufficient. In this paper we present the development of a new 3D...

Models of dynamic data for emergency response: A comparative study

The first hours after a disaster happens are very chaotic and difficult but perhaps the most important for successfully fighting the consequences, saving human lives and reducing damages in private and public properties. Despite some advances, complete inventory of the information needed during the emergency response remains challenging. In the...

A 3D model for geo-information in the Netherlands

This paper presents the work in progress of a research project that aims at establishing a reference model for 3D geo-information in the Netherlands. The research project is initiated by four national organizations: 1) Ministry of Housing, Spatial Planning and the Environment, 2) Kadaster, 3) Geonovum, and 4) the Netherlands Geodetic Commission....

Minder angst bij het geïntegreerde aanbesteden: Handleiding voor opdrachtgevers voor de afstemming van vraag en aanbod bij geïntegreerde aanbestedingstrajecten

De toepassing van geïntegreerde contracten is in opkomst. Ze biedt voordelen, maar de toepassing kent ook nadelen. Voordelen ten opzichte van het traditionele model zijn ondermeer de verhoogde sturing op tijd en geld, maar daar tegenover staat een verminderde sturing op het kwaliteitsaspect. Er is een angstbeeld ontstaan bij voornamelijk kleine...

Modelling riverflow in the Volta Basin of West Africa: A data-driven framework

In this thesis, a riverflow modelling framework developed for monthly riverflow prediction in the 400,000 km2 Volta Basin of West Africa is presented. By analysing available catchment rainfall, runoff and potential evapotranspiration series in the basin using methods such as correlation plots, autoregressive (AR) and autoregressive with...

Moving objects in a geo-DBMS: Structuring, indexing, querying and visualizing moving point objects in a geo-DBMS context

The main question of this research is: What is the potential and performance of a geo-DBMS to structure, index, query and visualize spatiotemporal points clouds of moving objects? Some researchers have been developing spatiatemporal data structures. These structures have some disadvantages. For instance, the model made by Vazirgiannis and...

Maintaining Reality: Modelling 3D spatial objects in a Geo-DBMS using a 3D primitive

The objective of this thesis is answering the following question: How can 3D spatial objects be modelled (i.e. /stored, validated, queried) in a Geo-DBMS using 3D primitives and how can these objects be visualised? To answer this question the theory from various literature is used to create a prototype implementation of a 3D primitive in a Geo...

Height in the cadastre: Integrating point heights and parcel boundaries

Geo-ICT technology push vs. Cadastral market pull