HDF & HDF-EOS Workshop VIIIHDF & HDF-EOS Workshop VIII

2004 October 26-28 Aurora, CO2004 October 26-28 Aurora, CO

Bruce Beaumont, Matt Smith, Bruce Beaumont, Matt Smith, Helen Conover, Sara GravesHelen Conover, Sara Graves

Subsetting at UAH

Why Subset?Why Subset?

• Goal: to provide a science data user with only the data they need as quickly as possible.

• Benefits science data users and data centers:- Reduces analysis time by reducing amount of data- Reduces time for data delivery- Reduces resources (network, personnel, media, etc.)

• Steps:- Locate spatial / temporal / spectral area of interest- Extract- Re-assemble for distribution/use

What is HSE?What is HSE?HHEW EW SSubsetting ubsetting EEnginengine

A new packaging option for the HDF-EOS Subsetter designed for users that want subsetting, but do not want to host the full HEW installation or even the standalone HEW back-end.

What is HEW?What is HEW?

• HDF-EOS Web-based Subsetter– Prototype software designed to be dataset-

independent (HDF-EOS)– Funded by NASA/ESDIS for EOS-DIS– To be used within ECS (EOS-DIS Core System)

– Original Front-end/GUI (optional)• Uses HTML forms and JavaScript

– Original Back-end• Needed subset criteria and HDF-EOS data

• Performed subsetting as a “batch” job

What are HSE’s capabilities?What are HSE’s capabilities?

• Versions available for HDF-EOS 2 and HDF-EOS 5.

• Subsets multiple files in one call.

• Subsets properly-formatted HDF-EOS grid and swath objects.

• Subsets spatially by latitude/longitude or row/column.

• Subsets swaths temporally by date/time range.

• Subsets swaths by full or partial (subscan) lines.

• Subsets spectrally by HDF-EOS field.

• Subsamples along any dimension by stride (repeating interval) or by discrete index list. (see chart)

• Copies all file and field attributes to the output file and updates HDF-EOS “core” metadata when possible.

0 1 2 3 4 5 6 7 8 9

0 1 2 3 4 5 6 7 8 9

Stride Subsampling on a Dimension•STRIDE = 2

Indexed Subsampling on a Dimension•INDEXES = (1, 3, 4, 5, 7)

Selected

Selected

Existing HEW Back-End Existing HEW Back-End ArchitectureArchitecture

• Front end supplies subsetting criteria file

• Subsetter writes messages to status file

• Subsetter writes messages to log file

• Subsetter sends e-mail to end-user

Subsetting criteria (ODL)

HEW_ DISS

End-user

Input file(s)

Output file(s) Log file

Status file

E-mail

Many sites do not want to create ODL files or the hassle of dealing with message or log files or e-mail.

New HSE New HSE ArchitectureArchitecture

• User application code builds subsetting criteria structure

• Subsetting engine function calls user’s functions for status and log messages

• No e-mail is sent

User Application Code

HEW Subsetting Engine function Input

file(s)

Output file(s)

HSE_ LogMsg callback

HSE_ StatusMsg callback

Subsetting criteria Return code

All subsetting functionality is contained within a callable function

SPOTSPOT

• Subsettability “checker”– Displays content/structure

of HDF-EOS4 (or HE5) files– Examines files for subsettability by HSE– Simple command-line interface– Stand-alone operation– Available at subset.org

HEW integration with ECSHEW integration with ECS

ECS EDG System

EDG ECS

Subsetter Input data

Output data

End user

Order submission

(HTML)

Data order and reply

Subset ODL and reply

Subsetting System

Output data (Reingested)

1

2

3 4

5

6

7

Product Availability MatrixProduct Availability Matrix

Product

HDF-EOS 2

(HDF4)

HDF-EOS 5

(HDF5)

HSE SGI Sun Linux N/A

HSE-5 N/A SGI Sun Linux

HEWBE SGI Sun Linux Planned

HEW SGI Sun Linux N/A

SPOT SGI Sun Linux

Currently Available/Planned Currently Available/Planned Subsetting ApplicationsSubsetting Applications

• HDF-EOS Subsetting Engine (HDF-EOS, HE5)Status Deployments– Complete System available GHRC

– Subsetting Engine Only available GSFC

– SPOT - Subsettability Checker available many

– HSE Integrated with ECS Data Order System available NSIDC, EDC

– HSE Integrated with AMSR-E Processing available AMSR-E SIPS

– Subsetting as a Web Service planned (ECHO)

• Customized Subsetting– MODIS tools available Science teams

– Coarse-grain SSM/I Subsetter available GHRC

• General Purpose Customizable Subsetting– Subsetting Tool using ESML in work (various)

http://subset.orghttp://subset.org