[Talk-us] Vegetation/landuse import

[Ian Dees]

On Thu, Dec 3, 2009 at 11:01 AM, Thea Clay <thea at cloudmade.com> wrote:

>  Hi guys,
> I am so excited that more land use imports are in the works. They make such
> a huge visual difference. Check out the border between a state with the
> import complete and one without:
> http://www.openstreetmap.org/?lat=34.896&lon=-85.408&zoom=9&layers=B000FTF
>
> Although the lower-detail zooms might look marginally better (I would say
they're way too cluttered right now...), the import was not done very well
for two main reasons:

1. All of the areas were imported with overlapping edges. This means there
is *tons* of duplicate information in the database. I learned my lesson with
the counties import: overlapping edge imports like this should be broken
apart and use relations for the borders.

2. The resolution of the landuse information is very low. If you zoom in and
use Potlatch to see what the aerial images look like, you can see that in
most cases the polygons don't come close to matching the actual landuse. in
the future, we should make sure that imports are high-enough resolution to
be useful in our datasets. 1:24k is the minimum and even that is not useful
in some cases.

I'm not trying to belittle the effort, I just want to make sure we don't
repeat the same mistakes on other huge imports like this.
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