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TSTool Documentation <br /> Introduction - 7 <br /> <br /> TS 09010500 = ReadTimeSeries(“09010500.USGS.Streamflo w.Month~HydroBase”) <br /> <br />If an alias is defined for a time series, the alias will be used instead of the alias and will be displayed in <br />command editors and results (although the TSID is often also shown in output). TSTool ignores <br />upper/lower case when compari ng identifiers, aliases, and other commands, although it is good practice to <br />be consi stent. The general term “TSID”, when used as a command parameter to identify time series to <br />process, allows a TSID or alias to be specified. <br /> <br />TSTool commands allow the al ias to be defined using time series properties. For example, the parameter <br />Alias=”%L” will assign the alias as the location part of the time series identifier. A combination of the <br />special formatting strings and literal characters can be used to create u nique aliases for time series. It is <br />recommended that aliases not contain spaces or other whitespace and that periods be avoided because <br />they are used in TSIDs . <br /> <br />When defining a series of commands as a workflow to perform a task, a user generally will dev elop a <br />rough draft of the process by using TSTool’s interactive data browsing and command editing features. <br />However, it is useful to develop a data flow description more identifiers that are more appropriate than the <br />default TSIDs provided by TSTool. Con sequently, at an appropriate time in the workflow definition, it is <br />useful to take a step back and review the identifiers being used, and insert aliases where possible. For <br />example, an inventory of time series may be defined to describe time series used i n a process, similar to <br />the following (where the bold indicates information that will be replaced with a specific value): <br /> <br />Alias Description <br />Location -Streamflow -Month - <br />Original <br />Original monthly streamflow . <br />Location -Streamflow -Month -QC Monthly streamflow d ata after quality control. <br />Location -Streamflow -Month Monthly streamflow data after filling data gaps, ready for <br />analysis. <br />Location -Streamflow -Year Annual streamflow data, accumulated from Location - <br />Streamflow -Month. <br /> <br />By using aliases, it is possible to s witch the data inputs with minor changes to the processing logic. I f it is <br />important to indicate the source of information , such as when comparing the same data stored in two <br />different databases , then the alias can be defined to include the input name . R egardless of whether an <br />alias is used, the original TSID also is maintained with the time series and is available for reports and <br />displays. <br /> <br />In summary, if an alias is assigned to a time series, it will take precedence over the TSID when <br />identifying the ti me series. <br /> <br />2.4 Date/Time Conventions <br /> <br />TSTool uses date/time information in several ways: <br /> <br />1. Data values in time series are associated with a date/time and the precision of all date/time <br />information should be consistent within the time series. <br />2. The data inter val indicates the time spacing between data points and is represented as a multiplier <br />(optional if 1 ) and a base (e.g., Day , Hour ). Consequently 24Hour data has a base interval of <br />Hour and a multiplier of 24 . <br />19