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Published byRoberta Scott Modified over 9 years ago
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Custom Query Tool
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Uses of CQT Access any data in the repository –Meteorological observations –Model data –Hydrology –Etc...
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Uses of CQT Generate climatology reports Create model derived soundings Retrieve raw data with QC checks Anything else you want it to do
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Running CQT CQT runs on JRE 1.3.1 or higher Installed on DAC Java WebStart-able Near future plans: Web interface
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Overview of CQT Layout
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Query List Section Once a query is selected from the list, the parameter section will update to reflect the selected query.
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Query Parameter Section The parameter window is located in the upper right corner of CQT. You enter the query constraints in this window. Each query has a list of parameters. Each parameter has a dialog window that will allow you to change its value. Parameter names highlighted in yellow are common to all queries.
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Results Table If the CQT Results Table is selected for the Output Location, the data will appear in a table in the bottom of the tool. This table can be copied into an Excel spreadsheet. Not all queries allow result to be seen in this table.
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Build A Query Query list is built from an XML file SQL Queries are very easy to build Other Queries require writing Java code
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SQL Query Example <query className=“edu.ucar.rap.cqt.SQLQuery” name=“DWRS:Retrieve MicroStep Data” > <parameter className=“edu.ucar.rap.cqt.Parameter” name=“sql” default=“SELECT * FROM mis_surface_data WHERE dt > ?” visible=“false” /> <parameter className=“edu.ucar.rap.cqt.DateParameter” fillsSqlQuestionMark=“true” name=“Start Date” default=“NOW” />
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Custom Java Query Must add query to the XML file New query must extend the class edu.ucar.rap.cqt.Query Demonstration with MicroStep data
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Existing Queries Model Derived Soundings (a.k.a. Virtual Soundings) Lightning strike maps and diurnal distribution
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Virtual Sounding Model data is interpolated to an arbitrary latitude and longitude. The Virtual Sounding query generates a skew-T plot, as well as a text file with wind and temperature values.
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Lightning Strike Map The map shows each individual lightning strike that was recorded.
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Custom Queries For The DWRS
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