Download topojson world file

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Username or Email. Remember me. Forgot password? Username or e-mail. Where to get source maps files depends on which area you want to map, but in the UK we are fortunate to have an abundance of open mapping data provided by the Office of National Statistics and accessed through the Open Geography Portal. Police Force Areas. Local Authority Districts. Lower Layer Super Output Areas. I need the Police force areas map so that I can extract the Lancashire polygon.

The Local Authorities Districts maps will allow data aggregated at the Local Authority level to be displayed. I chose these because each crime observation in the data set contains location data on where the crime was committed.

One of the columns is LSOA. There are also columns for latitude and longitude which is helpful should I wish to aggregrate by some other level of geography, but in this case LSOA is perfect. It's worth noting that there is a choice of files to download. The area mapped is the same, but the file sizes are different, depending on whether the polygons have been generalised - which essentially means reducing the number of points describing the polygons in the map.

This saves space, but at higher magnfications the resolution of the generalised and ultra-generalised maps is too coarse. The generalised files are fine, but in this case I've downloaded the full extent full resolution files, because I need to do some processing on the files to get the final maps I need, and I have had issues with this using the generalised files.

It is possible to generalise or simplify the maps yourself anyway to reduce the file sizse as you will see. Once downloaded, the files shoud be unzipped. We will need first extract the polygons - for Lancashire - from the the files and convert them to topojson format. There are various freely available tools to manipulate map files such as QGIS, ogr2ogr, R and others, however all these require installation.

Here is a step by step guide. Select, or drag and drop the unzipped police force area files to the mapshaper window. There are 6 files in the extract but only the shp, shx, prj and dbf files are required. If you select all six mapshaper just loads the four it needs. Click Import and you should see a map of English and Welsh police force areas.

We are only interested in Lancashire so click the Console link and in the console type the following:.

This removes all polygons except Lancashire from the map.