NDLI: Seamless access to surface current vectors from the IOOS HF radar backbone

Content Provider	IEEE Xplore Digital Library
Author	Holloway, D. Ullman, D.
Copyright Year	2005
Description	Author affiliation: OPeNDAP, Narragansett, RI, USA (Holloway, D.)
Abstract	A demonstration prototype has been developed using the Open source Project for a Network Data Access Protocol (OPeNDAP) to illustrate the potential that distributed data access can provide to the HF radar backbone within the Integrated Ocean Observing System (IOOS). An individual HF radar site produces maps of radial surface velocity. Since two or more radar sites are needed to provide vector currents, most operators of these systems deploy radars at multiple sites and produce current vector maps in the region of overlapping coverage of their sites. The underlying premise of the prototype is that each HF radar site within the backbone is considered a unique and separate data source. In our approach the radials from each HF radar site are accessed directly to compute the surface current vectors in response to a user's request. This allows radials from different operators to be combined, with the potential to compute surface current vectors for regions outside the vector coverage region of either operator. Since each HF radar site is recognized as a separate data source, new HF radar sites can be readily incorporated to extend the backbone's spatial coverage. Additionally, by directly accessing the radials the prototype demonstrates the capability to specify the latitude/longitude grid that surface current vectors are computed for, which can be different from that of existing operators. The prototype can be configured with a default latitude/longitude grid representation on which vectors are calculated, or extended using the functional interface capabilities available within the OPeNDAP constraint syntax to allow requesting applications to specify a latitude/longitude grid, or list of grid cell locations. The demonstration prototype consists of two specialized OPeNDAP servers: a Radial Server that is installed at the HF radar sites to read and serve the CODAR radial flies stored at the remote locations and the Combining Server, which is the primary application within the prototype. It operates to identify the HF radar sites within the backbone that have radials that can be combined to calculate the surface current vectors given the user's requested spatial and temporal extent. It communicates with the remote Radial servers, using the OPeNDAP protocol, to request only those radials necessary within the requested spatial and temporal extent. It then combines the radials from two or more HF radar sites to calculate the surface current vectors and the associated uncertainties at specific grid cell locations and returns these data to the requesting client.
Starting Page	949
Ending Page	952
File Size	154423
Page Count	4
File Format	PDF
ISBN	0933957343
DOI	10.1109/OCEANS.2005.1639877
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-09-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	MTS
Subject Keyword	Hafnium Spine Sea surface Prototypes Access protocols Doppler radar Oceans File servers Radar antennas Phased arrays
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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