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TSView Time Series Viewing Tools <br />Appendix - TSView - 12 <br />Time Series Properties – Data Flags <br /> <br /> TSView_TSProps_DataFlags <br />Time Series Propertie s - Data Flags <br /> <br />Time series data flags contain information that describe the quality of a data point. The missing data <br />value indicates a special number that is used to indicate that a data value is missing at a point. Currently <br />only floating point values are recognized; however the NaN (not a number) value is generally supported <br />for input types that use the convention. All time series are typically assigned a missing data value. <br /> <br />The Has Data Flags checkbox indicates whether the time series has data flag s. Full support for data flags <br />is being phased in, based on whether an input type supports data flags. The USGS NWIS file format is an <br />example of an input type that supports data flags (e.g., e is used to indicate estimated data). <br /> <br />One of the issues with fully supporting data flags is that different input types (and even different data <br />within an input type) treat data flags inconsistently. Therefore, it is easier to add data flags to time series <br />visualization tools (e.g., label points on a graph with the flag) than to integrate data flags in data filling <br />and analysis features. Features related to data flags will continue to be enhanced. <br />166