There is a great deal of interest in big data, focusing mostly on dataset size. An equally
important dimension of big data is variety, where the focus is to process highly …

Data lakes enable flexible knowledge discovery and reduce the overhead of materialized
data integration. Albeit effective for data storage, query execution over data lakes may be …

In this paper, we present QuerioCity, a platform to catalog, index and query highly
heterogenous information coming from complex systems, such as cities. A series of …

Governments and public administrations started recently to publish large amounts of
structured data on the Web, mostly in the form of tabular data such as CSV files or Excel …

Much of the focus on big data has been on the problem of processing very large sources.
There is an equally hard problem of how to normalize, integrate, and transform the data from …

Data in the maritime domain is growing at an unprecedented rate, eg, terabytes of
oceanographic data are collected every month, and petabytes of data are already publicly …

Big Earth-observation (EO) data that are made freely available by space agencies come
from various archives. Therefore, users trying to develop an application need to search …

In recent years, knowledge graphs (KGs) have been considered pyramids of interconnected
data enriched with semantics for complex decision-making. The potential of KGs and the …

Connecting data that government releases in diverse domains, such as economy, statistics,
environment, transportation, and medicine, as open data available on the web by using …

Abstract The European Commission has adopted Linked Data principles and practices with
the purpose of increasing the accessibility, interoperability and value of the data that is made …