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How to build your own SkyNode
A quick tutorial
by
Alberto Conti & Bernie Shiao
Space Telescope Science Institute
Baltimore, MD
[email protected], [email protected]
Introductory Notes

This brief tutorial was written after Bernie and I spend a morning
at JHU with Alex, Tamas and Wil to set up a SkyNode for GALEX
(http://galex.stsci.edu). The implementation was rather easy,
and we decided it would be a good idea to document the steps
we undertook for others to follow.
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GALEX uses MS SQL Server as its database server
GALEX database backend is written in C# under .NET Framework 1.1
GALEX uses IIS as its web server
Requirements
(based on GALEX example)
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Database: <dbname>, i.e. GALEX
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Objects Table: <objtable>, i.e. PhotoObjAll
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This table contains the catalog of all GALEX objects
Each object has several attributes that will be
accessible from each SkyNode
<objtable> MUST contain:
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objID, RA, Dec
htmID,cx,cy,cz
Requirements: continued
(based on GALEX example)
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Objects Table View: PhotoPrimary
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This view is obtained from <objtable>
The most general view is obtained by
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create view PhotoPrimary as select * from <objtable>
DBObjects Table: DBObjects
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Contains the metadata information about the
database, such as tables and user functions.
Requirements: continued
(based on GALEX example)
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DBColumns Table: DBColumns
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Contains the metadata information about each
table, such as columns, UCDs, units, etc.
A view name columns was needed for the GALEX
implementation and is was generated by
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create view columns as select * from dbcolumns
HTM Functions
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Run skynode-htmInstall.sql and install htm_v2.dll
under C:\Program Files\Microsoft SQL Server\MSSQL\Binn
Implementation
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Install SkyNode software under an IIS virtual
directory: http://galex.stsci.edu/SkyNode
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Edit the Web.Config file and replace the
database connection string:
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<add key="SqlConnection.String“
value="Initial Catalog=<dbname>; Data Source=<dbhost>;
User ID=<user>; Password=<password>;Connect Timeout=90" />
Implementation: continued
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Edit the Web.Config file and change the Info()
dictionary information such as
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SurveyName
SurveyArea
MetaTable
Sigma (astrometric precision)
PrimaryTable
RaName
DecName
Location
Implementation: continued
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Run the following SQL scripts:
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skynode-webSupport.sql
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Creates all the stored procedures used by the
SkyNode web service
skynode-getMatch.sql
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Creates the matching stored procedure called by the
XMATCH web method
Finally…
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Provide the URL of your SkyNode web service
to [email protected]:
Important Note
 The
database user <user> under
which the SkyNode stored
procedures will be executed, must
also have execution privileges on db
MASTER for ALL HTM stored and
extended procedures.