User access to satellite data

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Latest revision as of 16:52, 11 July 2007


[edit] Use Case AQ.SatelliteData.1.a

[edit] Purpose

Earth Information Exchange

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

[edit] Revision Information

Version 0.1.a

Prepared by: Rudolf Husar Washington University


Stefan Falke Washington University and Northrop Grumman IT - TASC

created: February 26, 2007

Revision History

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

[edit] Use Case Identification

[edit] Use Case Designation


[edit] Use Case Name

Short name: Satellite data access

Long name: Air quality user-access to satellite data by space-time-parameter queries

[edit] Use Case Definition

The AQ cluster has a fundamental need for a set of CORE web services that allow meaningful user-access to satellite data. These services include:

  • Data access by space-time-parameter query on granules
  • Subsetting that clips the data to user-specified BBOX
  • Mosaicing that splices granule mosaic into a coherent dataset

The proper chaining of these services results in a higher order service, WCS, that returns the requested satellite data for the BBOX, Time, Parameter. Not more not less. Such a WCS service was in fact used in the Web service chaining experiment. Extending that service to return numeric satellite data (not just images) is the goal.

[edit] Actors

[edit] Primary Actors

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

[edit] Other Actors

[edit] Preconditions

  • 1. Satellite 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.

[edit] Postconditions

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

[edit] Normal Flow (Process Model)

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

[edit] Alternative Flows

[edit] Successful Outcomes

  • 1.Operation succeeds and user obtains satellite dataset adhering to the requested spatial, temporal, and parameter filters.

[edit] Failure Outcomes

  • 1.
  • 2.

[edit] Special Functional Requirements


[edit] Extension Points

  • AQ.SatelliteAccess.1.b

NASA GSFC DISC implementation of WCS for OMI NO2 access

[edit] Diagrams

[edit] Use Case Diagram

[edit] State Diagram (optional)

[edit] Activity Diagram (optional)

[edit] Other Diagrams (optional)

[edit] Non-Functional Requirements (optional)

[edit] Performance

[edit] Reliability

[edit] Scalability

[edit] Usability

[edit] Security

[edit] Other Non-functional Requirements

[edit] Selected Approach

[edit] Overall Technical Approach

[edit] Architecture

[edit] Participating Organizations/Projects

[edit] Technology A

[edit] Description

[edit] Benefits

[edit] Limitations

[edit] Technology B

[edit] Description

[edit] Benefits

[edit] Limitations

[edit] References (optional)

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