[OSM-talk] Coastlines

[David Groom]

----- Original Message ----- 
From: "OJW" <streetmap at blibbleblobble.co.uk>
To: <talk at openstreetmap.org>
Sent: Monday, August 21, 2006 7:14 PM
Subject: Re: [OSM-talk] Coastlines


> On Monday 21 August 2006 14:21, J.D. Schmidt wrote:
>> But it is evident there's a consistent shift to the south east. My
>> preliminary investigation shows that the coastline is about 30 meter
>> south and 18 meters east of where it should be. Square mentioned on the
>> IRC channel, that thediscrepancy of 30 meters S-N direction, and 18
>> meters E-W direction is equivalent to about 1 arcsecond in both cases.
>
> So we want to upload another copy of Amager, with
> * Lat += 0.00028
> * Long -= 0.00028
> * Source = PGS_shiftedA
>
> to see whether that looks better?


Alternatively, you could take the existing PGS upload log file, strip out 
everything except the node data, add the shift to the node data, save it as 
a CSV file ,and open it in JOSM and compare it to the OSM data.  Takes less 
than 5 minutes to do this in a spreadsheet.

That way you don't have to populate the OSM database with another copy of 
the data.

David