Abschlussarbeiten
Entwicklung einer Schnittstelle zur Überführung von Geodaten des Projektes CEOP-AEGIS in ein NetCDF-Datenmodell und Publikation dieser Daten unter Verwendung der Internetanwendung Dchart
Art der Abschlussarbeit
Diplomarbeit
Autoren
- Holzer, Nicolai
Betreuer
- Prof. Dr.phil.habil. Manfred Buchroithner
Weitere Betreuer
Universität Strasbourg, Frankreich
Abstract
The Tibetan Plateau with an extent of about 2,5 million square kilometers at an average altitude higher than 4,700 meters has a significant impact on the Asian monsoon and regulates with its snow and ice reserves the upstream headwaters of seven major south-east Asian rivers. Upon the water supply of these rivers depend over 1,4 billion people, the agriculture, the economics, and the entire ecosystem in this region. As the increasing number of floods and droughts show, these seasonal water reserves however are likely to be influenced by climate change, with negative effects for the downstream water supply and subsequently the food security.rnThe international cooperation project CEOPAEGIS (Coordinated Asia-European long-term Observing system of Qinghai-Tibet Plateau hydro-meteorological processes and the Asian monsoon systEm with Ground satellite Image data and numerical Simulations) – funded by the European Commission under the Seventh Framework Program – aims as a result to improve the knowledge of the hydrology and meteorology of the Qinghai-Tibetan Plateau to further understand its role in climate, monsoon and increasing extreme meteorological events. Within the framework of this project, a large variety of earth observation datasets from remote sensing products, model outputs and in-situ ground station measurements are collected and evaluated. Any foreground products of CEOP-AEGIS will have to be made available to the scientific community by an online data repository which is a contribution to the Global Earth Observation System of Systems (GEOSS). The back-end of the CEOP-AEGIS Data Portal relies on a Dapper OPeNDAP web server that serves data stored in the NetCDF file format to a DChart client front-end as web-based user interface. Data from project partners are heterogeneous in its content, and also in its type of storage and metadata description. However NetCDF project output data and metadata has to be standardized and must follow international conventions to achieve a high level of interoperability. rnOut of these needs, the capabilities of NetCDF, OPeNDAP, Dapper and DChart were profoundly evaluated in order to take correct decisions for implementing a suitable and interoperable NetCDF data model for CEOP-AEGIS data that allows a maximum of compatibility and functionality to OPeNDAP and Dapper / DChart as well. This NetCDF implementation is part of a newly developed upstream data interface that converts and aggregates heterogeneous input data of project partners to standardized NetCDF datasets, so that they can be feed via OPeNDAP to the CEOP-AEGIS Data Portal based on the Dapper / DChart technology. A particular focus in the design of this data interface was set to an intermediate data and metadata representation that easily allows to modify its elements with the scope of achieving standardized NetCDF files in a simple way. rnConsidering the extensive variety and amount of data within this project, it was essential to properly design a data interface that converts heterogeneous input data of project partners to standardized and aggregated NetCDF output files in order to ensure maximum compatibility and functionality within the CEOP-AEGIS Data Portal and subsequently interoperability within the scientific community.rn
Zugeordnete Forschungsschwerpunkte
- Hochgebirgskartographie, Schwerpunkt multitemporale Gletscherkartierung mittels kosmischer Fernerkundungsdaten
- Fernerkundungskartographie
Schlagwörter
CEOP-AEGIS, NetCDF, OPeNDAP, DChart
Berichtsjahr
2011