Information Model

1. Representing Gridded and Space-time Data in HydroShare OCI-1148453 OCI-1148090 Tian Gan, David G. Tarboton, Jeffery S. Horsburgh Civil and Environmental Engineering Department, Utah State University Conclusions Introduction Create Data We present the aspects of the HydroShare of information model and system functionality for data creation, visualization, sharing and publication, so as to provide a suggested way representing gridded and space-time data in the HydroShare system. The information model is important, as it serves as a foundation for the representation of content in HydroShare and can help to better support reuse of the uploaded data and some of the system front end functionality. For the information model design, we propose to separate the science metadata attributes in two types which include the generic metadata applied for all the data classes and the class specific metadata to capture the class specific features. The proposed system functionality aim to provide user with useful information about the data and the ability to interact with other data available in the system. In the future, we will refine the information model and try to implement some suggested system functionality. Besides, we will design the social metadata and the system metadata attributes to better manage the uploaded data and the involved social information in HydroShare system. CUAHSI HydroShare is being built as a web system for hydrologic data and model sharing. It will expand the data sharing capability of the CUAHSI Hydrologic Information System (HIS) by broadening the classes of data and taking advantages of social media functionality to enhance the collaboration around hydrologic research. One aspect of the HydroShare development is to design the information model to capture the science metadata information for each data class. It will be used for cataloging purposes, facilitating data reuse and supporting some system front end functionality. We present the design of the information model for the gridded and space-time data classes which include time series, geographic raster and multidimensional space time arrays, and story board the proposed system functionality for creating, visualizing, sharing and publishing the three data classesto offer a suggested vision for how gridded and space-time data may be represented in HydroShare. The second step is to upload data files. User can drag files or folders directly to this interface or browse to select files. System will create a resource as long as a data file is uploaded into the system. And user can complete the science metadata, add or delete data files anytime later. Resource Table contains all the data uploaded by or shared with the user in HydroShare system. “Create” button is the start of creating a resource in the system. When data files are uploaded, system will automatically populate some of the science metadata attributes by referencing system information or by extracting the information from data files. Information Model • In the HydroShare information model, we separate the science metadata attributes into two types: generic metadata and class specific metadata. The generic metadata attributes are applied for all the data classes, and we propose to adopt Dublin Core Metadata Elements with additional sub elements to better elaborate them (Table 1). The class specific metadata attributes are to capture the class specific features. We examined the features of each data class and referred to some existing metadata designs for these data classes to select the attributes of the information model (Table 2 to Table 4). The science metadata attributes were selected to support the following purposes: • Providing information to facilitate data reuse • Cataloguing to support data discovery using the system search functionality • Visualization functionality Visualize Data In “Resource Detail / General Info” page, click on “Visualize” to see graphics of data. This page also shows some generic metadata information, the comments of the data and the editing history. Time series visualization will show some class specific metadata and the site location in the map. In the visualization tool, it has the function to add other time series data listed in the Resource Table. The NetCDF will also be visualized in the same tool for raster data. It can generate the animation of the data changing with time. And user can use the “Identify” tool to visualize the time series for a selected cell. The Raster visualization tool will provide the view function similar as ArcGIS. Besides, it can also add the feature class and the time series which are listed in the Resource Table. The time series will be represented as point. User can set the access policy for data and metadata separately. In “Resource Detail” page, click on “Setting” to share or publish the uploaded data. Resources can be submitted for formal publication which upon acceptance will result in a DOI being assigned and the resource becoming immutable with open metadata to public. User can set “Share List” to assign the other users to share the data with. Further Information Share and Publish Data Currently, we set up the HydroShare Beta Website. If interested, please visit: http://dev.hydroshare.org/ If any suggestions for design of information model or the system functionality, please email to: David G. Tarboton: dtarb@usu.edu Jeffery S. Horsburgh: jeff.horsburgh@usu.edu Tian Gan: gantian127@gmail.com