NASA GSFC DISC Web Coverage Service for OMI NO2

Purpose

Access to satellite data using queries over a continuous space-time-parameter domain.

Revision Information

Version 0.1.a

Prepared by:
Stefan Falke
Washington University and Northrop Grumman IT - TASC

Wenli Yang
NASA GSFC

created: February 26, 2007

Revision History

Modified by <Modifier Name/Affil>, <Date/time>, <Brief Description>

Use Case Identification

Use Case Designation

AQ.SatelliteData.1.b

Use Case Name

Short name: GSFC DISC WCS

Long name: Air quality user-access to OMI NO2 data using a WCS

Use Case Definition

The purpose of this use case is to expose data stored in the NASA GSFC DISC via OGC services to increase the discovery, access, and use of these data holdings by air quality scientists, researchers, managers, and those in NASA’s partner organizations.

Actors

Primary Actors

Air quality analysts interested in using satellite data for assessing air pollution, comparing satellite and surface data, "ground-truthing" model results.

Preconditions

• 1. OMI NO2 data are available through open interfaces
• 2. Data access service specifications, e.g. OGC Web Coverage Service (WCS), can be implemented by data provider or mediator
• 3. "Pre-processing", such as mosaicking and subsetting can be conducted to prepare the OMI NO2 data for WCS access.

Postconditions

• 1. Access of OMI NO2 data in a numeric format (as opposed to image format) covering the spatial area, time range, and parameters that were specified in the query.

Normal Flow (Process Model)

• 1) The user discovers the OMI NO2 WCS
• 2) The user submits a WCS GetCoverage request that includes bounding box, time, and parameter filters
• 3) The GSFC DISC provides the data that meets the query criteria. In the process, the data provider may need to execute swath mosaicking and data subsetting services.

Successful Outcomes

• 1.Operation succeeds and user obtains OMI NO2 data adhering to the requested spatial, temporal, and parameter filters.

Failure Outcomes

• 1.
• 2.

Special Functional Requirements

None

Selected Approach

Participating Organizations/Projects

• NASA GSFC DISC
• Washington University in St. Louis
• NASA GIO

Technology A

• OGC Web Coverage Service (WCS)