Quick question; how does this cope with updates to aerial/satellite imagery that may change the offset for a given service at a given location? Regards Ben
On 18 February 2011 07:47, Dermot McNally <[email protected]> wrote: > Hi, > > Many of you will have followed earlier discussions of the True Offset > process, intended to solve as simply as possible the problem of > imagery offsets by enabling editors to, by default, calibrate > background imagery based on offset data managed by mappers. In this > way, inexperienced mappers or people tracing without local knowledge > can avoid polluting the map with badly offset contributions. > > The service is now live and seems to be working well on the dev server > and I have updated the wiki page to reflect this and some late > changes: > > http://wiki.openstreetmap.org/wiki/True_Offset_Process > > The highlights: > > * You can try it at: > > http://mackerski.dev.openstreetmap.org/offset/1.0/offset/bing/20/53.26/-6.67 > > * I have re-documented the meanings of the offset northing and easting > to ensure compatibility in units and sign with the offset bookmarks > already exposed by the JOSM Imagery module. > > * This restatement of meaning may lead to a sign shift for one or > other of the values. So if you have previously entered offset data for > consumption by True Offset, please check that it is still correct. > This goes doubly for anybody who recorded offsets based on the > earliest proposals which used metres instead of degrees. > > * Offset Database updates are currently manual (this will change). So > for now, if you add or change some offset data, please let me know so > I can cause it to take effect. > > * Most of my test offset data has been for Bing imagery in Ireland. > Until the next database update, some of these may be inaccurate. > > My appeal: If you are a developer of one of the OSM editors that > supports background imagery layers, PLEASE build support for True > Offset, and please have your editors either apply the corrections > silently by default or at the very least prompt users that a known > offset exists and offer to use it. While I hope True Offset is useful > to experienced mappers who already calibrate their imagery, its real > purpose is to avoid the destructive effect of tracing mappers who > don't even realise they can or should calibrate. > > Happy Mapping! > Dermot > > -- > -------------------------------------- > Igaühel on siin oma laul > ja ma oma ei leiagi üles > > _______________________________________________ > talk mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk > -- Ben Last Development Manager nearmap.com
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