Topic: Problem extracting data by polygon

When I try to extract data using the polygon option I keep getting this message:

"An essential sheet cannot be found in the current map data set."

As far as I can tell, all the relevant polygons are saved in the correct place. Can anyone help with this please?

Many thanks


Re: Problem extracting data by polygon

Hi Graeme

There are some old posts with a similar problem here https://forums.nbn.org.uk/viewtopic.php?id=7603, here https://forums.nbn.org.uk/viewtopic.php?id=7162 and here https://forums.nbn.org.uk/viewtopic.php?id=6824 that might offer some clues.

As you aren't using a network install my guess would be it's a folder permissions issue.


Andy Foy
Systems Manager
Greenspace Information for Greater London (GiGL) CIC