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Case studies

Case studies presented at the GENASIS portal deal with a specific topic or a selected part of the data repository. Similarly to the data browser they allow for online analysis of selected data, which are processed and presented in a structure and level adjusted to a particular purpose and study and are supplemented with further information on given topic, methodology, and interpretation of obtained results.

Time series assessment in the era of Stockholm Convention & GMP

Jiří Kalina, Jiří Jarkovský, Ladislav Dušek, Jana Klánová, Jana Borůvková, Ivo Šnábl, Roman Šmíd

This interactive web publication will guide you through an entire process of data analysis on time series of persistent organic pollutants (POPs) carried out in a framework of the GENASIS project. The analysis consists of eight steps – from visual inspection of the data to obtaining the final results of descriptive statistics and trend tests. Each step is supplemented by an interactive example, where all the methods, R source code and several descriptions, comments and notes are available for hands-on training and practice. Demonstrative interactive examples were developed in order to allow the user trying all the described methods on his/her own in a real time. They are very intuitive and easy to manage even without any knowledge of R or another statistical software. All the examples include plots to demonstrate how the functions work and a brief legend on the methods used. The examples are accessible via the square tiles below the text. The Shiny R package was used to create all the examples.


Spatial modeling of pesticides concentrations and pools

Klára Komprdová, Jiří Komprda, Milan Sáňka, Ondřej Hájek, Richard  Hůlek, Jiří Jarkovský

The goal of this study is to use the modeling tools for prediction of environmental concentrations and pools of pesticides (HCB and DDT) in soil. Pesticides are widely distributed in all environmental compartments including air, soil, water, sediment and biota because of their physical-chemical properties like persistence, hydrophobicity and semivolatility. A number of available data from several projects conducted by RECETOX and CISTA during the last 10 years was collected for this purpose. Results of modeling are maps showing spatial distribution of HCB and DDT in the Czech Republic to provide information on environment contamination. It is also computed pools of these compounds in grassland, forests soil and arable land.


Interactive data visualization of long-term multi-matrix monitoring at Košetice station

Jiří Jarkovský, Jana Klánová, Richard Hůlek, Jana Borůvková, Ladislav Dušek

The case study Košetice presents results of more than 15 years of regular and integrated monitoring of POPs at the background EMEP station Košetice in interactive form. A unique data set from various matrices sampled at the station and its surroundings is suitable as an information source about the concentrations and fate of various POPs in the environment. The case study offers users a comprehensive set of interactive tools for viewing and analysis of the relevant data. The tools for data analyses involve (among others) concentration comparisons, correlations and evaluations of time trends, which are available for both chemicals (comparison of chemicals at one site) and sampling sites (comparison of one chemical concentration at different sites). Assessment of the baseline levels and benchmarking of monitored chemicals concentrations are possible as well.

The second important part of the case study are accompanying texts about sampling sites, sampling techniques, measured chemicals, and statistical tools explaining origin of the data that may help with interpretation of results. A dictionary of used expert terms has been prepared for less experienced users.

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