Topic: Mis-matched download pairs
I have downloaded some British Dragonfly Society Recording Scheme data by vice-county, one complete year at a time. I download search results in pairs - a default simple spreadsheet format and a custom format with just "Miscellaneous fields" selected, needing to match the record keys in both files to get the information I need.
The first two pairs (South Hampshire and South Wiltshire for 2010) worked perfectly, in that the record keys at the start of each line matched throughout the files (after sorting them). Since then about half of the pairs contain several lines where the record keys don't match, even though the number of records is the same. As an example, Dorset 2010 with 1,968 records has 1,407 matches but 561 record keys in each file which don't appear in the other. In all cases, the number of records in downloads matches the number shown in the search results on screen. I tried repeating one of the download pairs a few days later but the results were the same.
In addition, the custom file includes several duplicate lines.
The problem isn't limited by vice-county; for example, while South Hampshire 2010 is ok, 2011 has several mismatched records.
By using the NBN record number from the custom file to search for the record online, I can see that the data is complete for those records, in that it includes data that I would hope to find in the default file.
As a newcomer to NBN Atlas, I might be doing something wrong or expecting more than is available - but I think there is a problem with whatever creates the download from the search results.
I've listed the first few record keys from the Dorset 2010 download, in case my explanation isn't clear.
Any help appreciated, thanks.
Default file: Custom file: