[Talk-GB] Polygon Coverage of Cornwall

SK53 sk53.osm at gmail.com
Mon Jul 1 15:49:30 UTC 2019


Hi Emma,

A quick look suggests lots of landuse//landcover has not been mapped in
Cornwall, which is fairly typical of OpenStreetMap in general.

Given that you are using OpenMapTiles adding additional features to OSM is
probably the quickest way to get things which you are interested in
available in the tiles. This may not be too arduous if you are able to
assume that blank areas default to farmland.

If you use OSM data direct (e.g., from Geofabrik and loaded it into PostGIS
with osm2pgsql) or via geojson output from Overpass-Turbo and pull it into
a GIS package you could infill the gaps with something like CORINE data.
Obviously this is a long way from usable vector tiles, but probably gives
you decent complete coverage more quickly. There are some helpful
tabulations of how CORINE
<https://wiki.openstreetmap.org/wiki/Corine_Land_Cover#Tagging>and Urban
Atlas <https://wiki.openstreetmap.org/wiki/User:SK53/Urban_Atlas> data
codes correspond to OSM tags on the wiki. I may also have additional
residential/urban area polygons calculated from OSM which cover areas where
there are no landuse=residential polygons.

HTH,

Jerry



On Mon, 1 Jul 2019 at 16:02, Rosenfeld, Emma <E.Rosenfeld at exeter.ac.uk>
wrote:

> Hello all
>
> I'm using OpenMapTiles for some mapping work in Cornwall and the
> information that they are providing is really great. I have downloaded the landuse
> and land cover layers but there are gaps in coverage. Does this mean that
> the polygons need creating or are there polygons in existence somewhere
> that need classifying?
>
> Many thanks
>
> Emma
>
> Dr Emma Rosenfeld
> Research Technician
> Environment & Sustainability Institute
> University of Exeter, Penryn Campus, Penryn, Cornwall, TR10 9FE, UK
> <https://owa.exeter.ac.uk/owa/redir.aspx?C=bwYy5azoSU-eQhKkyRMRDqr3AVhZb88IFKNMOvWalNK2leAArrLF4-Oz9XZO3E7sLhLs2dfwmtU.&URL=http%3a%2f%2fwww.exeter.ac.uk%2fesi%2f>
>
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>
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