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I downloaded the "geo7_2ag.zip", unzipped it, ran ogrinfo -al on the geo7_2ag.shp file and learned the following:
The shapefile contains 11,977 polygons, each tagged with a GLG value.
There are 44 different GLG values. Some of these are: DS, H2O, Mi, O, S_d
Most of these values are explained in geo7_2ag.shp.xml and appear to ...
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This is not an answer.
If you visit https://sdmdataaccess.sc.egov.usda.gov/QueryHelp.aspx and download the "Table Column Descriptions Report (741K)" PDF, you will get a list of all tables (and column names) for your data.
You can then go to https://sdmdataaccess.sc.egov.usda.gov/Query.aspx and make queries like SELECT * FROM chaashto. You will have to ...
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I found KML files for district level boundaries for all UK Postcode areas on github at https://github.com/missinglink/uk-postcode-polygons/tree/master/kml
have tested with one file on google maps and it overlays the boundaries correctly
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For anyone else needing this information, it looks like Gaurav Sood compiled the relevant data and provided code to create the tables that link:
DMA to county
DMA to zip
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