[Talk-us] Proposed import of IBC data (was RE: [Talk-ca] NAD83-SCRS vs WGS84 Reference systems)

Paul Norman penorman at mac.com
Sun Mar 27 23:37:05 BST 2011

For the area here, they appear to all have monuments or the imagery is of
insufficient quality to determine. What's the difference between a survey
point and a turning point? Is it that one has a small change in direction
while the other has a large change in direction? 

For the 49th parallel, all of the monuments are of the form Mon xx or Mon.

For the other regions, I see some are of the form TP xx.

I don't think survey_point=turning_point is what we should use.
http://taginfo.openstreetmap.de/keys/survey_point#values shows that it's
mainly used to indicate the physical form of the survey point. 

> -----Original Message-----
> From: Richard Weait [mailto:richard at weait.com]
> Sent: Sunday, March 27, 2011 1:46 PM
> To: Daniel Begin
> Cc: imports at openstreetmap.org; talk-us at openstreetmap.org; Paul Norman;
> talk-ca at openstreetmap.org
> Subject: Re: [Talk-us] Proposed import of IBC data (was RE: [Talk-ca]
> NAD83-SCRS vs WGS84 Reference systems)
> On Sun, Mar 27, 2011 at 4:40 PM, Daniel Begin <jfd553 at hotmail.com>
> wrote:
> > Thank Paul, a really good idea to include others as they are concerned
> > :-)
> >
> > About tagging, I would agree with minor adjustments ...
> > man_made=survey_point - agreed
> >
> > ref=xxxx - agreed to reference a monument id However, I would add a
> > prefix for turning points, helping differentiate them from monuments.
> > I propose the prefix "tp ": ref=tp 123
> I'd prefer to see values without spaces, for ease of consuming
> downstream.  Does the source distinguish between monuments and turning
> points?  If not, perhaps following their lead makes sense by using their
> ref=123, and adding something like survey_point=turning_point, or
> similar?

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