Deep Field Surveys SD

Introduction

An astronomer wants to correlate deep field surveys taken in different wavelengths. Images taken in two wavelengths (for instance, optical and radio), are aligned so that matching objects can be identified and correlated in both images.

Flow of Events

1. First, the astronomer searches the resource catalogue for optical and radio deep field surveys with wavelength, instrument, sensitivity, dynamic range, epoch, and resolution metadata. A list of surveys is returned and one or more are selected. (PerformRegistrySearch)

2. The second wavelength (radio) survey is queried on the same position and radius, and another list of images is returned. PerformCatalogueSearch, MySpaceStoreResults)

3. The first wavelength (optical) survey is queried by coordinates and radius, and a list of images is returned.(PerformCatalogueSearch, MySpaceStoreResults)

4. Matching images from both wavelengths' surveys are uploaded to a compute resource. (NegotiateAccessToResource, TransferDataToResource ???)

5. Three algorithms are identified to the compute resource and run on both images: an astrometric alignment algorithm, a flux scale calibration algorithm, and finally a least squares fit alignment algorithm. (DetermineProgram)

6. The aligned images are returned to MySpace. (MySpacePublishDerivedData)

Sequence Diagram

UseCases:

These use cases are the ones that will be needed to deliver this case.

1. AuthenticateIdentity
2. PerformRegistrySearch
3. NegotiateAccessToResource
   • AuthenticateIdentity
   • DetermineAuthority
4. PerformCatalogueSearch
5. MySpaceStoreResults
   • NegotiateAccessToResource
     • AuthenticateIdentity
     • DetermineAuthority
6. ComplexQuery
   • NegotiateAccessToJob
7. DetermineProgram
   • AccessLibraryFunction
     • NegotiateAccessToResource
       • AuthenticateIdentity
       • DetermineAuthority
   • AccessWebService
     • NegotiateAccessToResource
       • AuthenticateIdentity
       • DetermineAuthority
   • UploadUserCode
     • NegotiateAccessToResource
       • AuthenticateIdentity
       • DetermineAuthority
     • MySpaceStoreResults
       • NegotiateAccessToResource
         • AuthenticateIdentity
         • DetermineAuthority
   • NegotiateAccessToJob
8. MySpacePublishDerivedData
9. SelectCatalogue
10. NegotiateAccessToJob
11. TransferDataToResource

-- ElizabethAuden - 30 May 2002