Inspection

After we have setup the cshapes dataset to be compatible with the Time Editor plugin, we now can check for potential errors in the data set and see if we can fix them.

Start by Opening the Inspect Layer Vector -> Time Editor -> Inspect Layer dialog.

Date Integrity and Geometric Integrity Check

The Checks for Date and Geometric Integrity should run without errors. This tells you that all date-values are entered in the correct format (YYYY-MM-DD) and all geometries are spatially valid (no self intersections or other). This shows already the high quality of the Cshapes data set.

Time Integrity

The Time Integrity check returns 15 errors.

We can export all the errors into a csv-file using the file-chooser under the tabular views of the errors and pressing Export CSV:

To inspect the potential errors it is best to filter by the common identifier (in our case gwcode).

Example France

One of the error will involve the common identifier code 220 (France). While the original datefield has been set correctly the attribute gweday apparently was not updated. We can fix this by changing the field value to 27 and updating valid_to accordingly (1919-06-27).

After these edits the code of France (220) will not show up in the Time Integrity Check.

Serbia

Another example involves the code 340 for serbia. As the date-integrity check states the feature with the id 126 results in an error. This is correct from the point of view of the algorithm as there is a missing date history from 1918-11-10 to 2006-06-06. This obviously is due to to the the lost sovereinity after the first world war and its dissolvement.

You can add this to the list of temporal exceptions for the Cshapes layer, for details refer to the Time Integrity Section in the Tutorial Basics.