Last Friday we received our first batch of digitised chart data and have begun the quality control process.
The digitised data are from Tilbury, covering the period 28/12/1984 to 12/10/1989. They started off as paper charts. One of the interesting aspects of these charts is that they show the effect on the water level of the closure of the Thames Barrier. This demonstrates how important it is that the digitisers have knowledge of where the charts come from and the environmental processes that can affect the operation of a site. If these charts had been digitised without the metadata (information about the data such as location, instrument type and date) then these strange-looking events might have been mistaken for instrument malfunction and flagged as bad data.
We’ll now begin carrying out quality control on these data. We will compare them to data from nearby locations (so-called buddy checking), look at previous data from the same site and compare the data with a harmonic analysis. I’ll talk more about our quality control procedures in a future post, but just wanted to inform everyone that we’ve now got some new digitised content!