[OSM-talk-be] CORINE Land Cover 2000

[Ben Laenen]

On 5/17/10, Kenny Knecht <kenny.knecht at gmail.com> wrote:
> 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 idea is that you manually check the areas where Corine didn't
overwrite existing data. So this data can be added later. Albeit with
a little work.

>    - 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.

Then work on changing the mindset of mappers? I don't see this really
as an existing problem anyway. I’ve seen big things changing on the
map before which wouldn’t happen if the mapper was scared of changing
something. Sometimes I even think that some mappers should be a little
more carefull.

And there are already some big polygons with landuse like the forests
in the Ardennes. So why would this just be a problem of Corine and not
the existing data?


> 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.

I agree the data isn't perfect. But I don't see better options to get
data like this in areas where yahoo satellite images aren't available
for now. And for most of those areas it will actually enhance the
existing landuse which is now usually very crudely drawn.

If somehow at a later date better data becomes available, it’s always
possible to remove Corine again.

OSM just works like that: start with big things and then get more and
more detailed. For 70% of the country Corine is better than existing
data, and I welcome anything which is an improvement.

Greetings
Ben