[OSM-talk] Announcement: Availability of True Offset web service

Nic Roets nroets at gmail.com
Sat Feb 19 05:42:56 GMT 2011

Hello Dermot and Steve,

Perhaps one solution would be to make a tool that downloads a few
reference tiles in the target area and then store the MD5 signatures.
Subsequent runs of the tool will check the hashes and generate beeps,
emails or tweets asking a human to check the offsets. And the tool
should be easy to write because it can work on either the compressed
images or a screen capture of an editor.


On Sat, Feb 19, 2011 at 2:52 AM, Dermot McNally <dermotm at gmail.com> wrote:
> On 18 February 2011 23:35, Steve Bennett <stevagewp at gmail.com> wrote:
>> Ok, I think you're probably right. One thing that would mitigate the
>> situation I was talking about would be if OSM editors display the
>> current offset somewhere on the screen. Maybe a little red arrow
>> pointing in the appropriate direction (and perhaps length indicating
>> the distance of the offset).
> Hmm, not bad - that is, at any stage that the imagery has been moved
> from its default position, there would be a subtle but visible
> indicator? That fits in pretty well with our underlying goals with
> True Offset, to make sure no mapper traces without realising that
> alignment is sometimes wrong, must be considered and can be changed.
> That suggestion, of course, would need to be taken up by the authors
> of each editor.
> Cheers,
> Dermot
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