GEO-C Vision Paper on Intelligent Geovisualizations accepted for presentation at SIGSPATIAL 2018

The paper  “Intelligent Geovisualizations for Open Government Data” (Authors: Auriol Degbelo and Christian Kray) has been accepted for presentation at the upcoming ACM SIGSPATIAL Conference.

Abstract: Open government datasets (OGD) have been flooding the Web in recent years. Geovisualisations are the natural way of making sense of them, and have been gradually coming out. However, one key problem is the lack of flexibility of these visualizations, which severely limits their re-use in new scenarios. This article, therefore, proposes to increase the intelligence of existing geovisualizations by incorporating five features, to make better use of OGD: (i) automatic geographic data type recognition, (ii) generation of geovisualization designs, (iii) monitoring of users’ understanding of geographic facts, (iv) self-optimization, and (v) user activity recognition. In addition to benefiting users of OGD, realizing these features presents rich scientific challenges and opportunities for Geovisualization research, the OGD landscape (and beyond).

Paper published in Sustainability Journal about “Air Quality Monitoring Network Design Optimisation for Robust Land Use Regression Models”

The paper Air Quality Monitoring Network Design Optimisation for Robust Land Use Regression Models (by Shivam Gupta, Edzer Pebesma, Jorge Mateu, Auriol Degbelo) has been published in the special issue Spatial and Spatio-Temporal Planning for Urban Health and Sustainability of Sustainability 2018, 10(5)

Abstract: A very common curb of epidemiological studies for understanding the impact of air pollution on health is the quality of exposure data available. Many epidemiological studies rely on empirical modelling techniques, such as land use regression (LUR), to evaluate ambient air exposure. Previous studies have located monitoring stations in an ad hoc fashion, favouring their placement in traffic “hot spots”, or in areas deemed subjectively to be of interest to land use and population. However, ad-hoc placement of monitoring stations may lead to uninformed decisions for long-term exposure analysis. This paper introduces a systematic approach for identifying the location of air quality monitoring stations. It combines the flexibility of LUR with the ability to put weights on priority areas such as highly-populated regions, to minimise the spatial mean predictor error. Testing the approach over the study area has shown that it leads to a significant drop of the mean prediction error (99.87% without spatial weights; 99.94% with spatial weights in the study area). The results of this work can guide the selection of sites while expanding or creating air quality monitoring networks for robust LUR estimations with minimal prediction errors.

According to United Nations estimates, 66% of the total world population is expected to be living in the urban spaces by 2050. At the same time, the Organisation for Economic Co-operation and Development (OECD) projects that by 2050 air pollution will be the top environmental cause of mortality worldwide. GIS and spatial analysis have increasingly become an essential tool for air pollution monitoring. Interpolation of pollution data collected by regulatory air quality monitoring stations can help in regional patterns, but the air quality monitoring networks are very sparsely arranged to collect informed data at a city level. Land Use Regression (LUR) models are helpful to take into account air pollution variability within the cities. LUR models are a promising alternative to these conventional approaches as they establish the relationship between easily accessible land use characteristics and pollutant measurement. Our knowledge of air pollution monitoring is mostly based on limited data. The published paper takes a new look at Monitoring Network Design (MND) using a new optimisation method. The proposed method identifies the combination of locations which minimise the spatial mean prediction error over the entire study area for two contexts: (1) without using any weighted function; and (2) with a spatial population weighted function for high population density areas. The optimisation method does not rely on monitoring station data for monitoring site placement, thus giving independence for planning and readjustments of the optimal air quality MND for the cities with no or insignificant amount of air quality data. Hence, the proposed method can be a helpful tool in air quality MND that enables LUR estimations with fewer errors for preventing air pollution exposure and advancing urban health sustainability.

For more detail information, please access the article from here.

The article is Open Access and is funded by European Commission within the Marie Skłodowska-Curie Actions, International Training Networks (ITN), European Joint Doctorates (EJD). The funding period is January 1, 2015 – December 31, 2018, Grant Agreement number 642332 — GEO-C — H2020-MSCA-ITN-2014.

Paper published in Statistics & Probability Letters Journal concerning “Quality of life, big data and the power of statistics”

The paper Quality of life, big data and the power of statistics (by Shivam Gupta, Jorge Mateu, Auriol Degbelo, Edzer Pebesma) has been published in Special issue dedicated to Statistics and Big Data of journal  Statistics & Probability Letters Volume 136 – May 2018

Abstract: The digital era has opened up new possibilities for data-driven research. This paper discusses big data challenges in environmental monitoring and reflects on the use of statistical methods in tackling these challenges for improving the quality of life in cities.

With an increasing number of people moving in (and to) urban areas, there is an urgent need of examining what this rising number means for the environment and QoL in cities. Air quality has an effect on the population’s QoL (Darçın, 2014), which is also the major environmental risk factor for health. Data for environmental and meteorological analysis are not only of a significant volume but are also complex in space and time. Formats and types of data are also very diverse (e.g., netCDF, GDB, CSV, GeoTIFF, shapefile, JSON, etc.), and many interconnections prevail within data, which make it complicated for traditional data analysis procedures. As Scott (2017) said, statistics remains highly relevant irrespective of ‘bigness’ of data. It provides the basis to make data speak while taking into account the inherent uncertainties. Statistical analysis involves developing data collection procedures to further handle different data sources and to propose formal models for analysis and predictions.

In the published paper we focused on the role of statistics in handling the five Vs (Volume, Velocity Variety, Veracity and Value) of big data, and the challenges posed.  We proposed to combine two well-established statistical methods to optimise the selection of variables and locations for spatial and temporal analysis of environmental data sources (with more focus on air quality monitoring). The combined use of both methods; Land Use Regression (LUR) and Spatial Simulated Annealing (SSA), proposed in the paper will help in designing data acquisition processes so that the maximum information can be extracted given a specific number of possible measurement sites. Limiting the data sources can increase the speed of the analysis. Hence, making big data analysis more effective regardless of the “bigness”.

For more detail information, please access the article from :

The article is Open Access and is funded by European Commission within the Marie Skłodowska-Curie Actions, International Training Networks (ITN), European Joint Doctorates (EJD). The funding period is January 1, 2015 – December 31, 2018, Grant Agreement number 642332 — GEO-C — H2020-MSCA-ITN-2014.

Paper published in TOCHI Special Issue ‘Re-imagining Participatory Design’

The paper ‘Participatory Design and Participatory Research: An HCI case study with Young Forced Migrants’ (Authors: Ana Maria Bustamante Duarte, Nina Brendel, Auriol Degbelo, Christian Kray) has been published in the special issue in ‘Re-imagining Participatory Design’ from the ACM Transactions in Computer-Human Interaction (TOCHI) volume 25 issue 3.

Abstract: Participatory design (PD) in HCI has been successfully applied to vulnerable groups, but further research is still needed on forced migrants. We report on a month-long case study with a group of about 25 youngforced migrants (YFMs), where we applied and adapted strategies from PD and participatory research (PR). We gained insights into the benefits and drawbacks of combining PD and PR concepts in this particular scenario. The PD+PR approach supported intercultural collaborations between YFMs and young members of the host community. It also enabled communication across language barriers by using visual and “didactic reduction” resources. On a theoretical level, the experiences we gained allowed us to reflect on the role of “safe spaces” for participation and the need for further discussing it in PD. Our results can benefit researchers who take part in technology-related participatory processes with YFMs.

The conference paper accepted for publication in PerDis 2017

The paper “Public displays for public participation in urban settings: a survey” (Authors: Guiying DuAuriol Degbelo, Christian Kray) has been accepted for publication in the 6th ACM International Symposium on Pervasive Displays.

Abstract: Public displays can be used to support public participation in urban settings. This article provides a survey of the use of public displays for public participation in an urban con- text, covering articles on this topic published between 2012 and 2016. 36 papers were selected and analyzed along eight dimensions: type of political context, type of scientific contribution, standalone displays vs displays with a device, single vs multi-purpose displays, shape of displays, lab vs field study, deployment in public vs semi-public space, and the level of public participation addressed. Our analysis revealed a number of trends regarding public displays and public participation in urban settings. Inspecting these articles also led to the observation that current research on public displays is mainly targeting lower levels of public participation and that the evaluation of public displays for public participation in urban setting remains a challenge.

Paper accepted for publication in JeDeM.

The paper  “Designing Semantic APIs for Open Government Data” (Authors: Auriol Degbelo, Sergio Trilles, Christian Kray, Devanjan
, Nicholas Schiestel, Jonas Wissing and Carlos Granell) has been accepted for publication in the eJournal of eDemocracy and Open Government.

Abstract: Many countries currently maintain a national data catalog, which provides access to the available datasets – sometimes via an Application Programming Interface (API). These APIs play a crucial role in realizing the benefits of open data as they are the means by which data is discovered and accessed by applications that make use of it. This article proposes semantic APIs as a way of improving access to open data. A semantic API helps to retrieve datasets according to their type (e.g., sensor, climate, finance), and facilitates reasoning about and learning from data. The article examines categories of open datasets from 40 European open data catalogs to gather some insights into types of datasets which should be considered while building semantic APIs for open government data. The results show that the probability of inter-country agreement between open data catalogs is less than 30 percent, and that few categories stand out as candidates for a transnational semantic API. They stress the need for coordination – at the local, regional, and national level – between data providers of Germany, France, Spain, and the United Kingdom.