Custom Query Tool

Custom Query Tool

Uses of CQT

• Access any data in the repository– Meteorological observations– Model data– Hydrology– Etc...

Uses of CQT

• Generate climatology reports

• Create model derived soundings

• Retrieve raw data with QC checks

• Anything else you want it to do

Running CQT

• CQT runs on JRE 1.3.1 or higher

• Installed on DAC

• Java WebStart-able

• Near future plans: Web interface

Overview of CQT Layout

Overview of CQT Layout

Query List Section

• Once a query is selected from the list, the parameter section will update to reflect the selected query.

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.

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.

Build A Query

• Query list is built from an XML file

• SQL Queries are very easy to build

• Other Queries require writing Java code

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” /></query>

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

Existing Queries

• Model Derived Soundings (a.k.a. Virtual Soundings)

• Lightning strike maps and diurnal distribution

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.

Lightning Strike Map

• The map shows each individual lightning strike that was recorded.

Custom Queries For The DWRS