[OSM-talk] [Fwd: Re: Bangladesh under the water]

[David Groom]

> ----- Original Message ----- 
> From: "Francois De Ryckel" <francois.deryckel at isdbd.org>
> To: "David Groom" <reviews at pacific-rim.net>
> Cc: <talk at openstreetmap.org>
> Sent: Monday, April 28, 2008 4:21 AM
> Subject: Re: [OSM-talk] [Fwd: Re: Bangladesh under the water]
>
>
> I found the script paul created?
>
> http://www.lenz-online.de/divers/osm/
>
> http://wiki.openstreetmap.org/index.php/Running_the_coastline_upload
>
> can't we just use it to re-load the missing data?
>
> Francois
>

It's not quite that simple.  The area in question is quite a complex river 
delta, and it needed quite a bit of manual correction to get the coastline 
correct.

You'd have to:

1) run the coastline script to generate data
2) compare the generated data from (1) to the partial data already in the 
database
3) delete the unused nodes which have been left over when someone deleted 
the coastline ways
4) fix the day generated in (1) so it was in the correct direction in all 
cases
5) upload the new data.

It seems a long process to go through when the correct data is somewhere in 
the database if only it could be extracted.

David

>
> David Groom wrote:
>>
>> ----- Original Message -----
>> From: "Jon Burgess" <jburgess777 at googlemail.com>
>> To: "David Groom" <reviews at pacific-rim.net>
>> Cc: <talk at openstreetmap.org>
>> Sent: Sunday, April 27, 2008 4:18 PM
>> Subject: Re: [OSM-talk] [Fwd: Re: Bangladesh under the water]
>>
>>
>>>
>>> On Sun, 2008-04-27 at 15:32 +0100, David Groom wrote:
>>>> >> http://tile.openstreetmap.nl/coastlines.html?zoom=8&lat=23.43505&lon=89.95194&layers=B00T
>>>> >>
>>>> >> Any ways to restore the square missing?
>>>> >>
>>>> > These are due to errors in the coastline ways. The red lines and
>>>> > circles
>>>> > highlight the location of the errors which will need to be fixed by
>>>> > editing the ways.
>>>> >
>>>>
>>>> When I originally imported the coastline in that part of the world I
>>>> fixed
>>>> it all.
>>>>
>>>> Unfortuntealtey it seems someone has now deleted quite a few coastline
>>>> ways
>>>> in that area leading to an incomplete coastline, and the errors being
>>>> reported.
>>>>
>>>> The correct ways should I guess still be in the history , but I'm not
>>>> sure
>>>> how to retrieve it.
>>>
>>> I've got a coastline shapefile from 2008-01-28 and that does indeed show
>>> that area as being nicely complete. I can see lots of disconnected nodes
>>> in the area now but the Potlatch 'Undelete' does not show any ways to be
>>> recovered.
>>>
>>> Does the upload script create a log of the way IDs and if so, do you
>>> have a copy still?
>>
>> I used the coast_josm.pl script to create a local osm file, edited that 
>> to
>> correct coastline errors, and then uploaded from within JOSM.
>>
>> I may haved saved the file after upload, but I doubt it. I'll have a look
>> though.
>>
>> David
>>
>>
>>>
>>> I guess we may need to search an older planet dump (or diff files) to
>>> find and resurrect the ways.
>>>
>>> Jon
>>>