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[WARNING: A gratuitous promotion of a product I am involved with] We have been working on a tool to do ETL. It is similar in flavor to FME but designed for simpler tasks and to require less expertise to use. Some details can be found at https://www.geoactive.it just look for information on Data Dragon. This application uses GDAL/OGR in the back end and we ...
The ERROR: function addGeometrycolumn(unknown, unknown, unknown, unknown,unknown, integer) does not exist means that the postgis extension is not installed on your postgresql. Go here and install it.
You could batch convert them with gdal to shp, either in python or on the command line and then open the result.
As suggested by @FelixIP you can pre-format your CSV to: Replace ND with 0.0. Replace NA with ridiculous -9999. Make sure 1st row in Excel contains numeric (if there is a number) with desirable decimal accuracy. then: When it comes to interpolation, select rows where CONCENTRATION <>-9999.
You are not giving a whole lot of information here... What version of the ArcGIS Editor for OpenStreetMap are you using? The latest version has seen some major improvements in terms of processing speed, and added much better multipolygon handling, meaning you get more accurate and better polygon output, close to what osm2pgsql achieves. Still, especially ...
The Vision of Britain has Ecclesiastical Parish boundaries but I can't see them listed on the data download page. It may be worth contacting the project to see if they can supply them. Or you could consider using Civil Parishes as @Mapperz suggests. In both cases I think the issue will be that Britain is not completely covered in parishes.
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