[OSM-talk-be] CORINE Land Cover 2000

[Kenny Knecht]

Hi,

I also looked at this import but I abandoned it for several reasons:

   - 25ha may be good for France or even Holland but for a region like
   Flanders it is simply too big: we have no land use planning (ruimtelijke
   ordening) here whatsoever. So land use tends to be small scattered patches.
   - The French conducted this import with the rule: if there is more than
   2% overlap with an existing region, the CORINE data will not be imported.
   This is very crude and you will miss some good data, but I understand the
   reasoning: overwriting the knowledge of local mappers should be avoided.
   - The last two reasons show that this import will result in data which
   will be far from perfect, but imported data will work discouraging for
   corrections:if something is present people tend to have respect for it and
   not change it, they tend not even to question it.

To sum it up: although it might seem great to have all this colour on our
map within a few hours, we should very carefully consider it. There are
numerous examples of hasty imports which introduced some strange quirks,
quirks which are very hard to get rid of afterwards.

Kenny


2010/5/16 Lennard <ldp at xs4all.nl>

> As some of you may know, last year the French have imported the CORINE
> Land Cover 2006 (CLC 2006) dataset. This dataset aims to classify every
> bit of surface of the participating countries. It is a project of the
> European Environment Agency (EEA) in conjunction with national mapping
> agencies. For Belgium, I believe this would be the NGI/IGN.
>
> While they did get approval to import their CLC 2006 dataset, getting
> approval from the NGI/IGN in Belgium would probably be problematic, and
> actually getting the data from them even worse. Although, if we don't
> ask, we'll never know for sure. (Anyone up for contacting them?)
>
> However, the CLC 2000 dataset is fully available on the EEA website, and
> has usage terms that seem to be very compatible with OSM.
>
> "Unless otherwise indicated, re-use of content on the EEA website for
> commercial or non-commercial purposes is permitted free of charge,
> provided that the source is acknowledged."
>
> On IRC, someone wanted to contact the EEA explicitly to obtain
> permission (for Belgium, but why not ask this for the entire dataset?).
> I don't see a problem with that, although for me the terms on the EEA
> site are clear.
>
> I have made an overlay which shows the CLC 2000 data on the OSM map:
>
> http://mijndev.openstreetmap.nl/~ldp/clc2000/<http://mijndev.openstreetmap.nl/%7Eldp/clc2000/>
>
> This is so you can already enjoy what we may be able to import, and
> maybe use it as a backdrop in Potlatch/JOSM or other editors to use. I
> don't recommend actually tracing the polygons, as a direct import is
> much easier.
>
> The amount of changes between CLC 2000 and CLC 2006 is on the order of
> 0.5% over the entire covered region. The overwhelming amount of polygons
> would be unchanged. I think there's not much harm in working with CLC
> 2000, even if it is 10+ years old.
>
> I have received the scripts used for the French CLC 2006 import, and can
> adapt and use those for an import of CLC 2000 for any area. I'm going to
> test them and prepare an import file for Belgium, which can be imported
> later on, if no valid objections are lodged.
>
>
> --
> Lennard
>
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