Kyeong Park

Classification of GIS-based models according to natural hazard types

Natural disaster and human-evoked disasters can’t be clearly distinguished in these days. From monitoring, alerting, managing, responding and recovering, all the experts including scientists, policy makers, and software engineers have discussed what will happen, what should be done first, what impacts the disaster events produce on economy and societies. At this moment, experts in each domain would like to apply their scientific models to explain the phenomena of potential disaster events and to estimate the human casualty and economic and social losses. What is model? Do we need data to make a model? How in detail data are enough to build and verified models? This study aims to overcome the difference in understanding natural hazard-related models and to make research and development program on hazard estimation model which is applicable to real worlds with least mismatch or less gap in understanding the concept of model. Here we suggest classification of the level of applications based on the purpose of each model, regardless of disaster types. Classifications were applied to researches and programs on flood, drought, earthquake and volcanic disasters.

4-Dimensional portrayal for volcanic ash diffusion utilizing voxel standardization in case of volcanic ash diffusion models

Map symbols are the promised signs to make geographic information be recognized quick and easy. With advances in GIS technologies and natural hazard models, portrayal is getting more important to massive amount of data dynamically in order to facilitate communication and proper decision making. This study aims to provide a framework to set up the portrayal for the phenomena of volcanic ash diffusion simulated by different models such as FALL3D, HYSPLIT, PUFF, and LADAS-VA. Previous researches on volcanic disaster and reports were collected and reviewed in the aspect of temporal, spatial and thematic dimensions. For integration of volcanic disaster response system, both standardization of voxel and the framework for 4-D data portrayal were designed. In order to expand the verification processes with satellite imagery for volcanic eruption, all the potential parameters were considered in the portrayal framework. For the later verification process, thematic schema includes observed one, simulated one and ensemble one. As diffusion phenomenon depends on wind field, we consider the whole-globe, the northern hemisphere, Asia realm, and a local realm, which were the product types of geostationary satellite imagery. Voxel standards were made by the groups of volcanic diffusion modelers who are involved in volcanic research program by the Ministry of National Public Safety and Security in 2015 and 2016 in order to compare the simulated results. This study may provide the portrayal framework for massive 4D-data beyond the volcanic ash diffusion model in the near future.