Downscaled Climate Projections
Data and Data Quality Control
Hour of Observation
For many stations the hour of observation given in the Metadata is incorrect. This fact is obvious when looking at temporally lagged correlations between nearby stations. An iterative method to correct the hour of observation errors was developed based on the observed versus the expected lagged correlation. The station with worst agreement between observed and expected is corrected first. Then all lagged correlations are calculated again, and the next worst station is corrected until some error threshold.
In some cases the day of observation is incorrect due to the volunteer observer's misunderstanding. For example, a morning observation is sometimes incorrectly labeled as the previous day because the majority of the 24-hour period is in the preceding day. These type errors are also corrected using the above method.
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