Spatial Data Access Tool SDAT Enable visualization and

Spatial Data Access Tool (SDAT) Enable visualization and access of geospatial data using OGC services and Google 1 Earth Yaxing Wei, Suresh K. Santhana Vannan, Robert B. Cook , Bruce E. Wilson, Tammy W. Beaty Environmental Sciences Division, Oak Ridge National Laboratory 2, Oak Ridge, Tennessee 37831 -6407 http: //daac. ornl. gov/spatial_data_access. shtml The Spatial Data Access Tool (SDAT) deployed in the Oak Ridge National Laboratory Distributed Active Archive Center (ORNL DAAC) and the Modeling and Synthesis Thematic Data Center (MAST -DC) provides visualization and access to a number of land cover, biophysical, elevation, ecosystem, climate, soil, and model output data sets using Open Geospatial Consortium (OGC) services. These services, such as Web Map Service (WMS) and Web Coverage Service (WCS), provide users visualization and access to geospatial data in different spatial/temporal extent, projection, resolution, and data format. Based on OGC WMS, the SDAT tool provides two options for geospatial data visualization. The first option is a Web-based interface that contains an Open Geospatial Consortium interactive map widget. This interface also provides options for users to specify parameters, such as projection and resolution, to download geospatial data. The second option is a Google Earth KMZ file created for each data set. The Google Earth KMZ files use the OGC WMS internally to provide visualization of the data dynamically within Google Earth and OGC WMS enable users to visualize the spatial pattern within a large extent and also to investigate the details in finer resolution. The KMZ files provide the capability to play time series animation if a data set contains multiple time steps. The KMZ files are also hyperlinked to the SDAT tool for each data granule so that users can easily download the geospatial data after visualizing them in Google Earth. Spatial Data Access Tool, Virtual Globe, and Google Earth The Open Geospatial Consortium, Inc. ® (OGC) is a non-profit, international, voluntary consensus standards organization that is leading the development of standards for geospatial and location based services. Open. GIS ® Standards support interoperable solutions that "geo-enable" the Web, wireless and location-based services, and mainstream IT. Web Map Service (version 1. 1. 1) Web Map Service (WMS): HTTP interface for requesting map images. http: //webmap. ornl. gov/ogcbroker/wms? Web Coverage Service (version 1. 0. 0) Web Coverage Service (WCS): HTTP interface for interoperable access to geospatial coverage data. Data sets served (65): � Land Cover (MODIS, AVHRR, etc. ) - 6 http: //webmap. ornl. gov/ogcbroker/wcs? � Soil collections - 4 � Field campaign (LBA, BIGFOOT) � Elevation (GTOPO 30, SRTM 30) � Ecoregions and climate - 4 � Carbon cycling models outputs - 30 Application: ORNL OGC services have been registered with popular catalogs such as NBII, GEOSS, and ECHO. Users can access ORNL OGC data sets from within these catalogs or write custom programs to access the data. Spatial Data Access Tool: http: //webmap. ornl. gov/wcsdown? publisher=mast-dc • Provide a Web interface to visualize and download ORNL DAAC, MAST-DC, and other relevant data sets using OGC WMS and WCS standards. • Provide a WMS-driven interactive map widget for data visualization and WCS-based options for data access. Multiple file formats and projections are supported. • Based on open source tools, such as Open. Layers, proj 4 js, and YUI library. • Help files and links to metadata, kmz files, and shopping cart provided. Virtual Globe technology Google Earth KMZ ORNL OGC WMS map layers can be imported into Virtual Globes, such as Google Earth, NASA World Wind, and ESRI Arc. Globe. A KMZ file was created for each data set for users to visualize data in Google Earth (special Relevant URLs MODIS Land Cover (IGBP) 2001 thanks to Karl Benedict and Renzo Sanchez-Silva for the ESIP-EDAC WMS to KML converter) Si. B 3 Carbon Flux Monthly Data NLCD 2001 ORNL DAAC http: //daac. ornl. gov http: //webmap. ornl. gov/wcsdown http: //daac. ornl. gov/spatial_data_access. shtml MAST-DC http: //nacp. ornl. gov http: //webmap. ornl. gov/wcsdown? publisher=m ast-dc OGC - http: //www. opengeospatial. org Map Server - http: //mapserver. gis. umn. edu MODIS Land Cover (IGBP) 2007 Contact Information Time-series animation 1 This Data sets to be added: �ORNL DAAC archived spatial data sets �SRTM 30 m elevation �MODIS land/water mask �MODIS vegetation continuous fields �FLUXNET site information �NLCD 2006 �many more ………… Technical: �Improve Net. CDF support. Add Net. CDF CF Convention files to file format options �More projection and file format options �Support Web Feature Service (WFS) for accessing feature data �Add support for OGC Styled Layer Descriptor (SLD) Download Options: • Spatial subset • Spatial resolution • Time step • File format • Projection • Band • Interpolation ORNL OGC services Future Work Embed SDAT within Google Earth study was supported by the NASA’s Earth Observing System Data and Information System and the North American Carbon Program (NACP). 2 Managed by the University of Tennessee-Battelle LLC under contract DE-AC 05 -00 OR 22725 with the U. S. Department of Energy Maps overlay for inter-comparison Yaxing Wei Environmental Science Division Oak Ridge National Laboratory Telephone: +1 (865) 241 -3403 Email: weiy@ornl. gov