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QA/QC of ASCE Std ET datasets <br />Automated Replacement of Missing/Bad Data <br />17 <br />Missing/Bad Vapor Pressure Data or Defined Aridity <br />•ASCE-EWRI (2005) Equation D.8 <br />•tdew(station2)=tmin(station2) – (tmin-tdew)(station1) <br />•Uses 3 defined replacement stations or manually defined. <br />Straight Replacement of Missing/Bad Data: (no regression) <br />•If sensor is bad for significant time periods (ie many months <br />or even years), linear regression is not appropriate <br />•Mainly used for solar and wind data <br />•Manually defined as straight replacement in spreadsheet <br />•Uses 3 defined replacement stations or manually defined <br />Filling missing daily data using available hourly data evaluated: <br />•Often introduced additional bad hourly data