**2.3 Displaying the scenes**

86 Emerging Informatics – Innovative Concepts and Applications

generated as input for VR-Systems. 3D service was tested with outputs from applications, which were solved in our institute and also by data from applications of the international

Natural disasters simulation is a very complicated, challenging problem sensitive to the input data required. Therefore, intense research and development of sophisticated software systems and tools is extremely important for Natural disasters fighting management purposes (Gruz, 2003). For example for Slovak forests, original methodology for forest vegetation classification and new fuel models have been developed and proper forest fire simulations related to the locality Krompla (National Park Slovak Paradise), where the large destructive fire appeared in 2000 and its reconstruction have been analyzed. These efforts induced the need of better auxiliary tools for 3D visualization of obtained simulation results and for animation of the forest fire spread. In this paper, new 3D visualization technique for real forest fire simulation and fire behavior and for flood and landslide modeling is described (Orland, 1994). The importance is increasingly expanded for environmental

**2. On-line visualization as a sequence application in grid environment** 

2. Transforming the data into a displayable form and the creation of virtual scenes

The output from a given series becomes the input for the next series.

by launching the visualization tool. This is the subject of visualization phase.

Grid-based applications that generate visualization outputs on-the-fly require a unified application framework. With regards to the Grid computational environment, it is advantageous to divide the performation of Grid applications into three separate phases.

The first, computational phase is submmision the application to the HP, Grid or Cloud environment. The whole application consists of a large number of consecutive series of jobs.

The user must prepare the data on the Storage Element and provide the configuration file before launching the job controller. Data can be added even while the application is running (providing the relevant rules are kept). During its run the user can observe the contents of directories with input and output data on the Storage Element. The simulation outputs are treated as input data by the visualization process. The job controller starts their processing

The aim of this phase is the transformation of the data into a displayable form and the creation of virtual scenes according to the requirements of the client. This phase is carried out by a visualization tool, which is together with its controlling agents, is the crux of this article. Apparently, the best approach is to create a separate visualization tool for each type of simulation. Only closely related applications, for instance different simulations of environmental phenomena, enable an usage of a shared control script. The user is free to

natural disasasters projects (Astaloš, 2010) .

1. Fetching the data from a simulation application

**2.2 Transformation the data into a displayable form** 

**2.1 Fetching the data from simulations** 

problems (Glasa, 2011).

3. Displaying the scenes

The purpose of this final phase is the display and analysis of output files from the second phase.This phase takes place on the client graphical device or in Grid to instal plugin. In new design for on-line visualisation tool is included also online approach for rendering . Examples from visualization scenas are shown on pictures.On Figure 1. and on Figure 2. we can see pictures from big Fire in Krompla region - Slovak republik. Figure 3. and Figure 4. - pictures show visualization results from flood on river Vah.

Fig. 1. Large Fire in Krompla region - Slovak National Park "Slovensky raj'', firespread in time 6 days

Visualization the Natural Disasters Simulations Results Based on Grid and Cloud Computing 89

Fig. 4. Picture of Flood visualization result - river Vah - Slovak region

cluster computing and high-performance computing infrastructure.

**3.1 Visualization tool and its integration in a scientific gateway** 

Thanks to e-infrastructures, researchers can collaborate, communicate, share resources, access remote equipment or computers and produce results as effectively as if they and the resources they require were physically co-located. However, to properly achieve those results, community-oriented e-science environments are required. E-sciences ask for developing user-friendly interfaces, which sophisticated implementations are also known as science gateway. The science gateway is important component of many large-scale Earth, astronomical, environmental and natural disasters science projects. Developing the sciences portals and the science gateways is coverage of requirements of large scale sciences such as Natural Disasters, Earth science, Astronomy and all sciences which are using grid, cloud or

Through user-friendly web interfaces such as e-Science gateway integrated into the same environment, researchers and scientists can securely and transparently access computational and data sources, services, tools, sensors, etc. Science gateway is a

**3. Scientific gateway** 

Fig. 2. 3D - firespread visualization result of Krompla region

Fig. 3. Picture of Flood visualization result - river Vah - Slovak region

Fig. 4. Picture of Flood visualization result - river Vah - Slovak region
