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CRDSS <br />TASK MEMORANDUM 1.05-18 <br />Study of System Integration Issues <br />GUI - Time Series Displays <br />1.0 ISSUE <br />Time series (TS) displays are one of the more important display components of the CRDSS, both for <br />end-user displays, calibration, analysis, and quality assurance/quality control (QA/QC). This <br />memorandum discusses the TS display tool to be implemented in the CRDSS. <br />2.0 DISCUSSION/ANALYSIS <br />TS data consist of time-stamped data, usually recorded at constant data intervals, e.g., daily, <br />monthly, yearly. The data may be envisioned as a two-column array of X (time) and Y (data) values. <br />In order to allow flexibility in pre-processing and calibration, it is assumed that TS may contain <br />missing data (gaps where data have not been recorded). <br />TS should be displayable both in graphical and tabular form as shown in Figure 1. If the display tool <br />xmgr, <br />is stand-alone (e.g., a program like see below), a "widget wrapper" will be developed to call <br />the tool and monitor its return status. (A "widget wrapper" is a way of surrounding an external <br />program call with a control routine that is integrated into the existing GUI.) If the display tool is <br />GR <br />developed as a widget (e.g., using , see below), then the tool will be integral to the calling <br />application and can be better integrated in terms of error-handling and response to the user. An <br />not <br />external tool for plotting will most likely also contain features for displaying data in a tabular <br />manner and would therefore require run-time processing to ensure that the information displayed in <br />the plot and in the table are consistent. This may result in a slight performance degradation. <br />timeQ1 Q 2 <br />Q, cfs <br />time <br />Figure 1. General time series plotting tool requirements <br />1 <br />A275 05.10.94 1.05-18 Malers <br />