Astrogrid Web>SRD>ArchitectureOverview>UseCaseDesign>SequenceDiagrams>GalaxyClusteringSD (2002-08-19, ElizabethAuden)EditAttachGalaxy Clustering SD
Introduction
An astronomer wishes to calculate the density of galaxies over a particular location and then determine the redshift of those galaxies' spectra.
Flow of Events
First, the physicist searches the resource catalogue for galactic catalogues. An appropriate catalogue is identified and searched with a complex query on colour inequality. A list of target locations is returned, and target galaxy datasets are uploaded to a compute resource. The astronomer then uploads and runs a density map creation algorithm on the compute resource. Next, a redshift estimation algorithm is uploaded and run on the galaxy target datasets. The compute resource returns the coordinates of peaks on the density map. The astronomer can then search the resource catalogue for a spectrographic catalogue to query by coordinates. Matching spectral data is uploaded to the compute resource along with an algorithm to compute redshift. The compute resource returns the redshift of target galaxies.
Sequence Diagram
UseCases:
These use cases are the ones that will be needed to deliver this case.- AuthenticateIdentity
- PerformRegistrySearch
- NegotiateAccessToResource
- PerformCatalogueSearch
- MySpaceStoreResults
- ComplexQuery
- DetermineProgram
- DetermineModel
- MySpacePublishDerivedData
- SelectCatalogue
- NegotiateAccessToJob
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