TOPAZ system forecasting

1
Title

• TOPAZ system forecasting
• product presentation
• (modeling netCDF files)?

2
Introduction

• Student
• Goran Zangana
• Supervisers
• Carsten Helgesen
• Torill Hamre
• Laurent Bertino

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Topics of content

• Nansen Center.
• Topaz System.
• Today's situation.
• Forecating Examples.
• TOPAZ system product format (netCDF files).
• OPeNDAP DODS (dds,das,......).
• Overview over some of OPeNDAP clients.
• OPeNDAP applications atchitecture.
• Some applications structure.
• What have been done?What are challenges?

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Nansen Center

• Nansen Environmental and Remote Sensing Center
  (NERSC) is an independent non-profit research
  institute affiliated with the University of
  Bergen, Norway. The Nansen Center conducts basic
  and applied environmental research funded by
  national and international governmental agencies,
  research councils and industry.

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Topaz System

• Topaz is a forecasting system for the ocean_sea
  parameters (temp., salinity,.....) at Nansen
  center.
• The Topaz domain covers North Atlantic and
  Arctic.
• Topaz product users
• Noncommercial User
• Global Oceanography researcher, participants in
  operational oceanography projects.
• Commercial User
• 2.1 Offshore operations industries
• 2.1.1 Oil industries.
• 2.1.2 ship traffics.
• 2.1.3 fishing industries.
• 2.2 Offshore operations personnel.

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Today's situation

• Topaz System has no web interface to present it's
  product(netCDF files).

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netCDF files(Input Data)?

• netCDF(Network Common Data Format)
• is a set of software libraries and
  machine-independent data formats that
• support the creation, access, and sharing of
  array-oriented scientific data.
• netCDF library NCO (netCDF Operator).

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netCDF file architecture
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netcdf topaz_V3_mersea_nat_grid1to8_da_class1_b200
80305_f200803149999 dimensions
longitude 869 latitude 441
depth 12 variables float
longitude(longitude)
longitudeaxis "X"
longitudestandard_name "longitude"
longitudeunits "degrees_east"
longitudevalid_range -180., 180.
longitudelong_name "longitude"
float latitude(latitude)
latitudeaxis "Y"
latitudeunits "degrees_north"
latitudevalid_range -90., 90.
latitudestandard_name "latitude"
latitudelong_name "latitude"
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netCDF files continue....

• Which netCDF type are they?
• Grid data (Class 1)?
• Rectilinear
• Curvilinear
• In-Situ data (Class 2)?
• Stations
• Sections (profiles)?
• Time series data comparison data (Class 3)?

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OPeNDAPDODS(dds,das,...)

• OPeNDAP (Open-source Project for a Network Data
  Access Protocol)
• is internet protocol for remotely accessing
  scientific data.

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OPeNDAPDODS(dds,das..) cont...

• DODS (Distributed Oceanographic Data System).
• Is a system that allows you to access data over
  the internet using OPeNDAP, from programs that
  weren't originally designed for that purpose.
• With DODS, you access data using a URL, just like
  a URL you would use to access a web page.
• DDS
• The Data Descriptor Structure (DDS) is a data
  structure used by the DODS software to describe
  datasets and subsets of those datasets.
• DAS
• The Data Attribute Structure (DAS) is a set of
  name-value pairs used to describe the data in a
  particular dataset
• These are the structures of the netCDF meta_data
  which DODS provides and they are stored in an
  application server or in a database account.

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Overview over some of OPeNDAP clients

• CDAT (Climate Data Analysis Tools).
• Matlab
• Ferret
• ncBrowse
• ncview
• NCO (netCDF Operators).
• OPeNDAP Data Connector.

• LAS (Live Access Server)?
• DChart(Dapper Data Viewer)?

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Some applications structure

• Dapper-DChart.
• http//eva.nersc.no8183/dods/
• http//eva.nersc.no8183/dchart/
• LAS (Live Access Server)?
• http//topaz.nersc.no/las/servlets/dataset
• http//topaz.nersc.no8182/las/v7alphaUI.html

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Dapper architecture
OPeNDAP Protocol (HTTP)?
Dapper HTTP Server
OPeNDAP clientDChart

CORBA (IIOP)?

Climate Data Portal


Java netCDF library
MySQL

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What have been done?

• Analyzing understanding the problem.
• Installation, implementation of both
  dapper-dchart LAS applications the
  prerequisites softwares by them.
• Integration LAS with Thredds.
• Presentation of class 1 for both NAT ARCTIC in
  LAS.

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What are challenges?

• Class 2 Class 3
• Compatibility of TOPAZ netCDF files with the
  existing applications (Conventions for
  standardization of TOPAZ netCDF files following
  COARDS Cooperative Ocean/Atmosphere Research
  Data Service).
• Pacific Marine Environmental Laboratory (PMEL)
  provided the EPIC software package for
  oceanographic data. PMEL has developed the EPIC
  system library (EPS library), which is layered on
  top of the netCDF input/output library, to write
  netCDF files with the conventions to recommended
  standard implementation.
• http//www.epic.noaa.gov/epic/eps-manual/epslib_to
  c.htmlSEC30