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The GFDL Data Portal A NOAA partnership. Kevin O’Brien Steve Hankin Serguei Nikonov V. Balaji. Background. GFDL. Background. TMAP. PMEL. Introduction to LAS. The Live Access Server (LAS).

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the gfdl data portal a noaa partnership

The GFDL Data PortalA NOAA partnership

Kevin O’Brien

Steve Hankin

Serguei Nikonov

V. Balaji

slide3

Background

  • TMAP
  • PMEL
the live access server las

Introduction to LAS

The Live Access Server (LAS)

A highly configurable Web server designed to provide flexible access to geo-referenced scientific data

las two types of configurability

Introduction to LAS

LASTwo types of configurability
  • Configurable hierarchical presentation
    • to address different “information architectures”
  • Configurable data browse/access
    • to address grids, variables, constraints, …
slide6

Introduction to LAS

Configurable hierarchy of information

Example – GODEA Intercomparison

slide7

Introduction to LAS

Configurable hierarchy of information

Example – NDBC Buoy Prototype

slide8

Introduction to LAS

Once the dataset or variable of interest has been identified …

slide10

Matlab,

IDL, IDV,

Ferret,

GrADS, …

Information Products

netCDF,

HYCOM binary,

ASCII,

GIS layers

fds ferret data server
FDS (Ferret Data Server)
  • FDS is an OPeNDAP server
  • Automatically installed with LAS
  • Therefore every gridded LAS dataset is served via OPeNDAP
  • Has extended analysis capabilities beyond basic OPeNDAP servers
slide13

Introduction to LAS

Compare

Fields

slide14

Introduction to LAS

Compute simple analyses

slide15

Introduction to LAS

LAS

UI

LAS core

Meta-

Internet

(perl)

data

Standard

legacy

Local

application

Data

Batch

(

Ferret

)

K-12

Multiple User Interfaces

The UI talks to LAS through an XML “web service”

slide18

Technical challenges include:

  • Managing large collection of model files
  • Directing “customers” to desired data
  • Controlling resource-intensive data requests
  • Dealing with curvilinear coordinate systems
slide19

Technical challenges include:

  • Managing large collection of model files
      • Annual, monthly, daily, 3-hourly, etc
  • Directing “customers” to desired data

Solution: Unidata Aggregation server and OPeNDAP

  • Handling resource-intensive data requests
  • Dealing with curvilinear coordinate systems
slide20

Technical Challenges

Solution: Unidata Aggregation server and OPeNDAP

  • Unidata Aggregation server
    • Combines a group of files/datasets into one logical dataset
    • Uses THREDDS catalogs to specify the datasets it serves
  • OPeNDAP
    • Allows access to remote data via the internet, using http
    • format of the native data not a worry
    • only need to transfer the subset of interest
slide21

Technical challenges include:

  • Managing large collection of model files
  • Directing “customers” to desired data
  • Handling resource-intensive data requests

Solution: Use LAS “categories”

  • Dealing with curvilinear coordinate systems
slide24

Search

coupled

coupled

slide26

Technical challenges include:

  • Managing large collection of model files
  • Handling resource-intense data requests
  • Directing “customers” to desired data

Solution: LAS defaults to a “batch” mode for large requests

  • Handling resource-intensive data requests
  • Dealing with curvilinear coordinate systems
slide28

Technical challenges include:

  • Managing large collection of model files
  • Dealing with curvilinear coordinate systems
  • Directing “customers” to desired data

Solution: Ferret, FDS, regridding……

  • Handling resource-intensive data requests
  • Dealing with curvilinear coordinate systems
slide31

Future directions:

  • Automation
  • Implement standards for regridding
  • Expand Modeler community
    • Increase “fusion” of GFDL models with others
      • OPeNDAP
      • LAS Sister Servers
        • Several different LAS servers which share XML
slide32

For more information:

  • Ferret: http://www.ferret.noaa.gov
  • LAS: http://www.ferret.noaa.gov/Ferret/LAS
  • GFDL data portal: http://nomads.gfdl.noaa.gov
  • OPeNDAP: http://www.opendap.org

Thank you!

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