George Mason University (GMU)

Transcription

1 George Mason University (GMU) Center for Spatial Information Science and Systems Organization (CSISS) 4400 University Drive, MSN 6E1 George Mason University Fairfax, VA 22030, USA Telephone: Facsimile: Tutorial for Hosting Access Services to MODIS Land Surface Temperature/Emissivity Products with OGC WCS Proposal for the OGC RFQ FOR GEOSS AIP-4 Technical Proposal Proposal Due Date: 31 May 2011 Business POC Name: Liping Di Business POC Business POC phone: Technical POC Name: Liping Di Technical POC Technical POC phone: 1

2 GMU CSISS Technical Response to the OGC RFQ for AIP-4 1 Overview The Center for Spatial Information Science and Systems (CSISS), George Mason University (GMU) is one of original developers of OGC Web Coverage Service Specification (WCS). CSISS is also one of pioneers in developing WCS servers to serve satellite remote sensing images to the user community. In OGC WMT- II in 2000, CSISS led the development of the first version of OGC WCS specification, WCS 0.4 and implemented the first WCS server in the world to prototype the use of WCS specification for distributing satellite Earth observation data to the user community through the web. Since then, CSISS has been involved in the development of all OGC WCS versions, and is a member of OGC Web Coverage working group. CSISS has implemented all major versions of WCS specifications in its GeoBrain WCS server, run the WCS server as a data broker at GMU to serve NASA, NOAA, and USGS satellite data to the user community, and helped NASA data centers (GES DISC, MODAPS, and LPDAAC) to set up WCS servers for distributing their archived data. In OGC OWS-8, CSISS has been tasked to develop an open-source reference implementation of WCS 2.0 EO server. In addition, CSISS researchers are very familiar with the CEOP datasets listed in the GEO Critical Earth Observation Priorities document [1], and know how to use a WCS server to serve those datasets to the user community. In fact, the WCS servers at CSISS and NASA data centers are serving those data operationally. CSISS is a major technical contributor to GEOSS. We developed and are operating GEOSS Component and Service Registry (CSR) and have participated in GEOS AIP-1, 2, 3, and 4 as a major technical contributor. All above background and experience proves that we are the ideal candidate for developing the WCS tutorial. 2 Proposed Contribution We propose to develop a WCS tutorial for GEOS AIP-4. The tutorial will address AIP engineering components that provide data access-the Data Brokers and Long-Term Archives, with CEOP datasets as example. The tutorial will be based on open source implementation of OGC WCS specifications, specifically, the Apache Web server, and GMU CSISS s open source WCS 2.0 reference implementation. The tutorial will capture all necessary steps in setting up an Apache-based Web Server, installing and configuring WCS server, accessing to this WCS server through HTTP protocol, and registering the service with GEOSS. The example CEOP satellite data, the underlying GMU CSISS s open source WCS package, and the open source Apache Web server package are all freely available. 2.1 Specification Development None 2.2 Access Service Tutorials CSISS s experience in developing, deploying or training on WCS Please see section 1 of this response about the CSISS general experience on WCS. Specifically, both Dr. Liping Di and Dr. Wenli Yang have been extensively involved in the development of OGC WCS specification and the implementation and deployment of WCS services for Earth observation data since GMU CSISS s WCS service package supports a variety of Earth Observation data formats, including HDF, HDF-EOS, NetCDF, GeoTIFF, and Grib. It has been successfully demonstrated in research projects funded by NASA, NOAA, USGS, FGDC, and in international or national collaboration projects, such as 2

3 GEOSS AIP and OGC OWS. It has been operational at GMU and at long-term NASA data archive centers for many years The contents of the proposed WCS tutorial We will follow the SIF outline and template of tutorial topics to develop the tutorial. In this response to RFQ, we have included the proposed outline of the WCS tutorial. We will discuss with AIP participants, OGC AIP staffs, and intent tutorial users for any additional contents. We expect the tutorial will be refined through multiple iterations with the user community. The proposed outline of the WCS tutorial is given below: 1) The goal, objectives, and targeted audience of this tutorial 2) Brief introduction to GEO, GEOSS, GEOSS AIP, and GEO s Critical Earth Observation Priorities (CEOP) to set the context of this tutorial 3) Introduction to the OGC WCS standards 4) Introduction to the modules used in this tutorial -- Apache server -- GMU CSISS s open source WCS service package -- Example CEOP datasets 5) Steps to set up and operate a WCS service (for both data brokers and data archives) -- Apache server installation, setting, and testing -- CEOP data deployments and testing -- GMU CSISS WCS installation, settings, and testing -- Integrated WCS service testing with CEOP datasets. --Register the service with GEOSS 6) Operation and maintenance of WCS service -- Operational procedures -- Ingestion of new datasets into the services --Service errors and trouble shutting. 7) Discussions -- How to contribute the resources and the developed WCS service to the GEOSS? -- How to follow this tutorial to publish other Earth Observation data through WCS interface? -- Things need to consider when providing robust WCS interface in an operation environment. -- How to use the example data for GEOSS SBA application. 8) Conclusions Proposed method for distributing the tutorial 3

4 We will firstly package all the involved modules, including the example datasets, the WCS server, the Apache server, and the tutorial in a single installation package. The package will be staged at CSISS s web server and make it publicly accessible. This complete package will make the installation much easier. The tutorial will be published on GEO, AIP, SIF, and CSISS website. We will announce it through AIP-4 lists so that AIP-4 participants will be able to review and use this tutorial over the course of AIP-4 development. We will register the tutorial with GEOSS, so that this material will be discoverable and accessible by all the GEOSS users. We will also demonstrate it in the coming technical meetings or workshops of GEOSS, CEOS, OGC, IEEE, NASA, and NOAA. In particular, the CEOS WGISS meeting and the ESIP Federation meeting are two important opportunities that we will take, as many data agencies will join the meetings as well. We hope this tutorial will be of help for data providers to understand the OGC WCS specifications and to utilize them in making their data resources Web-accessible. We will specify a technical person as the POC for answering tutorial users questions Addressing the GEOSS context This tutorial will be concurrently developed, along with the development of WCS 2.0 reference implementation funded by OGC for the OWS-8. This tutorial will be organized as straightforward as possible for other data providers to follow. Data providers will understand the general process in serving their data resources through Web-based protocols. They will further learn the OGC WCS standards, how they work, and how satellite data could be served through these public WCS interfaces. Beginning with a brief introduction to the GEO, GEOSS, SBA, AIP, and GEO s Critical Earth Observation Priorities (CEOP), the tutorial will enable the data providers to understand the general context of GEO and GEOSS and the needs of GEOSS users. They will also learn that this is actually an opportunity in promoting the usage of their data by making their data accessible through public standardized interfaces. This tutorial will then discuss how to contribute the data resources and the WCS service to the GEOSS through GEOSS Common Infrastructure. Therefore, providers will easily follow this approach in making their contributions in the near future. This tutorial will further discuss on the issues when providing WCS service in an operation environment. This will ensure the long-term sustainable development of GEOSS, as quality resources and services are highly expected. 2.3 Components: Clients, Mediated Access Enablers and Service Proxies None. 2.4 Demonstration or Test Development None. 2.5 Data As we discuss in Section 1, CSISS has access to almost all CEOP datasets collected by satellite-based Earth observations. Based on the GEOSS AIP priority, we can use any of the datasets as example. As the starting point of discussion, we propose to use global precipitation datasets from TRMM satellite as the example datasets. The reason to select precipitation datasets is that precipitation data is the high priority CEOP datasets needed by all GEOSS SBAs. Meanwhile, the size of dataset from TRMM is relatively small so that it can easily be packaged into the tutorial distribution package for users to download. The followings are example of TRMM precipitation data that covers area from 40 degree N to 40 degree S. TRMM 3A26: Monthly 5 x 5 degree Surface Rain Total TRMM 3A12: Monthly 0.5 x 0.5 degree mean 2A12, profile, and surface rainfall TRMM 3A46: Monthly 1 x 1 degree SSM/I Rain TRMM 3B31: Monthly 5 x 5 degree Combined Rainfall 4

5 In addition to those global grid products, TRMM also provides rain intensity in swath form with much higher space resolution. The swath data can also be served by the WCS services. CSISS has in-house expert (Dr. Zhong Liu) on TRMM precipitation data products. He can answer users questions if needed. 2.6 Development Participation This tutorial will be concurrently developed along with the development of the open source WCS service, which is part of our OWS-8 contributions. Dr. Liping Di will supervise the development of this tutorial. Dr. Yuqi Bai will be responsible for writing the tutorial along with Mr. Yuanzheng Shao, who is the implementer of WCS 2.0 reference implementation. Dr. Wenli Yang, an expert on WCS specification and Dr. Zhong Liu, a precipitation and atmosphere data expert, will contribute the tutorial development as inkind contribution. 2.7 Hardware The flagship computing facility in CSISS is an Apple G5 cluster server, which is connected to Internet 2 at 1 Gb/s. The server has a head node consists of dual 2.0GHz G5 processors, 4GB of DDR SDRAM and two 250GB Hard disks. There are five cluster nodes each having dual 2.0 or 2.3 GHz G5 processors with 2GB DDR DSRAM and 8GB hard disk. The storage system of the server consists of five RAID systems with total capacity of 22.5 Terabytes. The RAID systems and the head node are interconnected through 2Gbps fiber channels. This tutorial will be developed on one MacOS 10.5 Apple G5 server. It will be permanently hosted on one of the Apple G5 Web server at CSISS center. 2.8 Software The open source WCS 2.0 reference implementation package will be contributed to the development of this tutorial. As a free downloadable software package, it will be hosted on one of the Apple G5 Web server, as part of this tutorial package. 5