[Imports] Importing Arkansas data

[Ian Dees]

I'm happy to hear that you spoke with some other members of the community,
but I'm not satisfied that the import is technically sound.

As someone that has performed several imports incorrectly (NHD and county
borders to name a couple), I can tell you already that your import will fail
since you are uploading 50,000 nodes at a time. If any of these nodes are
touched before you start uploading ways (changing their version number),
then that entire chunk of ways will fail, leaving millions of "orphaned
nodes" without a way.

Also, presumably these parcel data consist of polygons that abut each other?
Have you written your OSM code in a manner that deals with overlapping ways?
If you have two 4-node polygons with an overlapping edge, do the nodes
overlap? Is there one node attached to the two ways? Do you create a
relation for each polygon with the shared edge sitting in both relations?

As you can see, imports like this are very complicated and should not be
dumped into OSM without lots of vetting and testing. Ideally, the community
would help you import it. While I'm happy to hear that Arkansas and ESRI are
working OSM on this, I don't think it's quite ready for prime time yet.

-Ian

On Mon, Mar 28, 2011 at 2:21 PM, Marten Hogeweg <mhogeweg at esri.com> wrote:

> Hi Ian,
>
>
>
> We have had other responses from OSM contributors and are working with the
> State of Arkansas and those folks tell us there is no issue contributing
> this data to OSM. We also see various places around the world that have the
> parcel boundaries loaded into OSM and some of those are featured as ‘best of
> OSM’. We do not see it as a data dump.
>
>
>
> Kind regards,
>
>
>
> Marten
>
>
>
> *From:* Ian Dees [mailto:ian.dees at gmail.com]
> *Sent:* Monday, March 28, 2011 12:14 PM
> *To:* Al Pascual
> *Cc:* imports at openstreetmap.org; Christine White; Marten Hogeweg
> *Subject:* Re: [Imports] Importing Arkansas data
>
>
>
> Hi Al et al,
>
>
>
> I noticed (http://www.openstreetmap.org/user/Al%20Pascual/edits) that have
> decided to go forward with your parcel import even though we expressed our
> wishes that you do not (or at least that we talk about it more).
>
>
>
> Can you at least answer the questions I posed earlier before continuing
> dumping this data into OSM?
>
>
>
> -Ian
>
>
>
> On Mon, Mar 21, 2011 at 12:29 PM, Al Pascual <apascual at esri.com> wrote:
>
> Imports,
>
>
>
> The state of Arkansas provided the data in shapefiles to be uploaded to
> OpenStreetMaps, we prepared the parcel data to be uploaded making sure they
> are not duplicates of parcel data in Arkansas, also we have all road data
> for the state that we will like to upload, we wrote a tool that using ArcGIS
> Editor for OpenStreetMap 1.1 detects duplicates by how many collisions and
> intersections we found and only uploads the ways that do not have any
> collision.
>
>
>
> Let us know if you have any questions.
>
>
>
> Cheers
>
> Al
>
>
>
> *Al Pascual*
>
> ESRI Professional Services
>
> Office:(909)793-2853 x1045
>
> [image: Description: Followme] <http://twitter.com/alpascual>
>
>
>
> [image: Description: esri]
>
>
>
>
>
>
> _______________________________________________
> Imports mailing list
> Imports at openstreetmap.org
> http://lists.openstreetmap.org/listinfo/imports
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/imports/attachments/20110328/b3bd3988/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 13007 bytes
Desc: not available
URL: <http://lists.openstreetmap.org/pipermail/imports/attachments/20110328/b3bd3988/attachment-0001.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image002.jpg
Type: image/jpeg
Size: 2467 bytes
Desc: not available
URL: <http://lists.openstreetmap.org/pipermail/imports/attachments/20110328/b3bd3988/attachment-0001.jpg>