Jan Caha

Jan Caha
Mendel University in Brno · Department of Regional Development and Public Administration

Ph.D., RNDr.

About

37
Publications
9,572
Reads
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154
Citations
Additional affiliations
February 2016 - present
Mendel University in Brno
Position
  • Professor (Assistant)
September 2014 - June 2015
VŠB-Technical University of Ostrava
Position
  • Researcher
December 2012 - July 2014
Palacký University Olomouc
Position
  • Researcher
Education
May 2012 - December 2015
Palacký University Olomouc
Field of study
  • Geoinformatics
September 2010 - November 2014
Palacký University Olomouc
Field of study
  • Geoinformatics
September 2008 - June 2010
Palacký University Olomouc
Field of study
  • Geoinformatics

Publications

Publications (37)
Article
Full-text available
Visibility analyses are essential analyses in both landscape and urban planning. Currently, available tools do not provide means to answer many complex questions related to the visibility. These complex questions are solved by so-called extended viewsheds or visibility indices. This article describes the Line of Sight Analyst toolbox for ArcGIS (ve...
Article
Full-text available
The aim of the article is to assess the visibility of the planned high-rise buildings – Prague Eye Towers in Prague. Commonly used methods either do not provide sufficient information about visibility (viewshed analysis) or the results cannot be spatially evaluated (photomontages and 3D visualizations). However, extended viewsheds and reverse views...
Conference Paper
The prediction of meteorological phenomena is usually based on the creation of surface from point sources using the certain type of interpolation algorithms. The prediction standardly does not incorporate any kind of uncertainty, either in the calculation itself or its results. The selection of the interpolation method, as well as its parameters de...
Article
Full-text available
The objective of the study was to evaluate stress invoked by a temperature decrease in the common carp (n = 56). After acclimatisation to laboratory conditions at a temperature of 27.8 ± 1.0 °C, the fish (n = 28) were transferred to 16.8 ± 1.0 °C water (group T2; temperature difference Δ –11 °C); the rest of the fish were kept at the original water...
Article
Full-text available
Quality of life and life satisfaction are topics that currently receive a great deal of attention across the globe. Many approaches exist, which use both qualitative and quantitative methods, to capture these phenomena. Historically, quality of life was measured exclusively by economic indicators. However, it is indisputable that other factors infl...
Article
Full-text available
Non-tuberculous mycobacteria (NTM) are ubiquitous environmental bacteria that can induce pulmonary and non-pulmonary diseases in susceptible persons. It is reported that the prevalence of NTM diseases is increasing in developed countries, but this differs by regions and countries. NTM species distribution and the rate of diseases caused by NTM vary...
Conference Paper
Full-text available
Speleo therapy is a climatic therapy method using the specific cave climate as a natural source for complementary treatment of asthmatic patients reducing their complex pharmaceutical therapy to minimum. The purpose of this contribution is to present the socio-demographic profile of the patients attending speleo therapy in the Paediatric Sanatorium...
Article
The paper concerns the epidemiology of Mycobacterium tuberculosis complex (MTBC) members except for M. tuberculosis in the Czech Republic in 2000 to 2016. M. bovis was confirmed in 18 patients. M. caprae was diagnosed in two patients in 2001 and 2016 and M. microti in one patient in 2007. M. africanum was detected in one HIV infected woman from Nig...
Article
Full-text available
Nontuberculous mycobacteria (NTM) are widely distributed in the environment. On one hand, they are opportunistic pathogens for humans and animals, and on the other hand, they are effective in biodegradation of some persistent pollutants. Following the recently recorded large abundance of NTM in extreme geothermal environments, the aim of the study...
Conference Paper
The availability of detailed and precise digital surface models based on LiDaR data allows accurate calculation of visibility analysis even in urban areas. Lately, the viewshed analysis, which is implemented in geographical information systems, is often used to determine the visibility of buildings or other structures in both natural and urban envi...
Conference Paper
Weighted Linear Combination (WLC) is one of the most popular methods for Multiple Criteria Decision-making (MCDM) in the field of geoinformatics. A typical utilization of WLC is in land suitability assessment and optimal location detection. The application of WLC requires the determination of weights for each criterion used in the MCDM problem. In...
Article
Forest decline is either caused by damage or else by vulnerability due to unfavourable growth conditions or due to unnatural silvicultural systems. Here, we assess forest decline in the Czech Republic (Central Europe) using fuzzy functions, fuzzy sets and fuzzy rating of ecosystem properties over a 1×1km grid. The model was divided into fuzzy funct...
Article
Full-text available
This article demonstrates utilization of large scale surface models with small spatial resolution and high accuracy, acquired from Unmanned Aerial Vehicle scanning, for visibility analyses. The importance of large scale data for visibility analyses on the local scale, where the detail of the surface model is the most defining factor, is described....
Article
Full-text available
Fuzzy surfaces are surface models that account for the uncertainty that originates either in data or from user's uncertainty about the interpolation settings. So far, fuzzy surfaces have been visualized as 3D projections, profiles or as separate visualizations of three surfaces that show minimal, modal and maximal estimated value. Unfortunately, ne...
Article
Full-text available
The presented research shows how the first derivatives (slope and aspect) can be calculated from a fuzzy surface by the means of fuzzy arithmetic within the geographic information system. The proposed method works with fuzzy numbers of arbitrary shape which helps with more precise specification of input values as well as more exact calculation of r...
Book
Trvalé abiotické predispozice ohrožení lesů jsou na území České republiky podmiňovány jarními teplotami, mimovegetačními teplotami, podzimními atmosférickými srážkami, atmosférickými srážkami ve vegetačním období, depozicí oxidovaných forem dusíku, depozicí redukovaných forem dusíku, půdní bazickou saturací, celkovým nesilikátovým obsahem hořčíku a...
Chapter
The determination of visibility within GIS is often treated as a Boolean phenomenon. The surface is classified into two classes—visible and invisible parts of surface. This classification is result of the algorithm that compares whether a point of interest rises above all points on a line of sight that can be constructed between a viewing point and...
Technical Report
Full-text available
https://github.com/Rexamine/FuzzyNumbers/raw/master/devel/tutorial/FuzzyNumbers-Tutorial_current.pdf
Chapter
This paper discusses a proposition of the landslide monitoring system within the framework of the project on modeling of the relation of landslide displacement and rainfall in the Czech flysch Carpathians, using wireless, remote sensing and GIS techniques. Its main objective is to develop a model which would reveal this relation, and to that end, a...
Conference Paper
When processing spatial information it is very important to maintain the maximum possible accuracy of positional and attribute characteristics. The level of accuracy is determined by the required details in the digital model processing or in the resulting cartographic visualization. Inaccurate information perceived from digital cartographic represe...
Conference Paper
Decision making support is one of the main objectives of geographical information systems. So far mainly boolean queries and boolean logic are used for spatial decision making problems. The study presents utilization of Possibility theory for modelling constraints and preferences for spatial data. The importance of aggregation operators in decision...
Chapter
Decision making is one of the most important application areas of geoinformatics. Such support is mainly oriented on the identification of locations that fulfil certain criterion. The contribution presents the suitability of various approaches of spatial query using different types of Fuzzy thresolds. Presented methods are based on the classical lo...
Conference Paper
The selection of optimal path is one of the classic problems in graph theory. Its utilization have various practical uses ranging from the transportation, civil engineering and other applications. Rarely those applications take into account the uncertainty of the weights of the graph. However this uncertainty can have high impact on the results. Se...
Article
Full-text available
The accompanying Main Map shows forest vulnerability zones calculated for the Czech Republic, covering a total area of almost 79,000 km2. Calculating forest vulnerability zones over such a large area requires a unique approach due to its complexity. The map includes additional information on forest areas and topography. The model of forest vulnerab...
Conference Paper
Full-text available
The aim of the study is to present utilization of Possibility theory to evaluate soft spatial queries on Fuzzy Surfaces. Fuzzy Surfaces are constructed from incomplete datasets or from data that contain uncertainty that is not of statistical nature. Soft spatial queries are common in geography because a lot of classes that should be found in the da...
Conference Paper
Full-text available
Appropriate decision making cannot be made without sufficiently precise information. Most of the information acquired by different methods of spatial data processing is inaccurate in the certain extent and it is very important to know the range of this inaccuracy. In order to supply the user with both result of analysis as well as its uncertainty t...
Article
Analysis of the slope is one of the fundamental analyses within geoinformatics, especially its initial calculation. Slope analysis is usually used as the first step in much more sophisticated analyses as well as in complex models of natural phenomena. Fuzzy surfaces provide representation of geographical phenomena with all aspects of the uncertaint...
Conference Paper
Full-text available
The investigation into ecotones enabled a better understanding of the causal relationships between certain landscape elements, landscape utilisation categories and ecotones. By studying ecotones, we wanted to expand understanding of patterns having an influence on the landscape condition, structure, functions, landscape elements and their relations...
Conference Paper
Full-text available
The paper addresses a landslide-prone area on Fruška Gora Mt. in NW Serbia. It proposes a model of relative landslide susceptibility based on fuzzy sets. Having a variety of spatial attributes (proven statistically significant) at disposal, as well as present landslide inventory map, we conducted systematic analysis through (i) assigning fuzzy memb...

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