EOS Data Dumper:an Automatic Downloading and Re-Distributing System for Free EOS Data

Data sharing gets more and more attention to make better use of existing data resources,preventing from repeated financial investment.NASA Earth Observing System(EOS) provides a large amount of free datasets(e.g.MODIS) which can be widely applied to geo-science research.However,downloading free EOS data of given study area through EOS Data Gateway(EDG) is a time and labor consuming process,and is not easy to ensure to get data on time and efficiently,due to generally heterogeneous data sources,vast amount of data size,and rapidly updating speed,of remote sensing imagery data.EOS Data Dumper(EDD) addresses this problem,attempting to download EOS free data by a computer program instead of manual work.Functions of automatically downloading EOS data of a specified study area at a given time are then implemented by simulating normal EDG downloading workflow and adopting advanced text-based information capture technology.Data and Information Access Link(DIAL) is used in this system to distribute EOS data already downloaded to local disks by Web to scientists with common interests in the given study area,and to provide a complex spatial and temporal search.In this paper,the background and necessity of EDD are introduced,followed by a detailed description of methodology and key technology involved.