[Talk-us] GSoC 2011 Mentor Signup
Hi all, Google opened up the application process for GSoC mentors today. If you're interested in helping students and OSM this Summer please head over to our page on the GSoC website and submit an application: http://www.google-melange.com/gsoc/org/google/gsoc2011/osm Let me know if you have any questions. -Ian ___ Talk-us mailing list Talk-us@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-us
Re: [Talk-us] Proposed import of IBC data (was RE: [Talk-ca] NAD83-SCRS vs WGS84 Reference systems)
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. xx 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:rich...@weait.com] > Sent: Sunday, March 27, 2011 1:46 PM > To: Daniel Begin > Cc: impo...@openstreetmap.org; talk-us@openstreetmap.org; Paul Norman; > talk...@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 > 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= - 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? > ___ Talk-us mailing list Talk-us@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-us
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 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= - 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? ___ Talk-us mailing list Talk-us@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-us
[Talk-us] Proposed import of IBC data (was RE: [Talk-ca] NAD83-SCRS vs WGS84 Reference systems)
Adding talk-us@ and imports@ to the cc list since this touches the border. The IBC data matches decently with the NAIP and Bing imagery on the border, and very well with my 10cm Surrey imagery. The existing border data in OSM is about 20m away in parts (near monument 32 for example) The proposed tagging is man_made=survey_point ref=32 source=CA-US International Boundary Commission I don't think it's worth the effort to worry about any NAD83-CSRS vs. WGS84 differences. I've uploaded a sample at http://maps.paulnorman.ca/49th.osm > -Original Message- > From: Richard Weait [mailto:rich...@weait.com] > Sent: Sunday, March 27, 2011 6:22 AM > To: Daniel Begin > Cc: talk...@openstreetmap.org > Subject: Re: [Talk-ca] NAD83-SCRS vs WGS84 Reference systems > > On Sat, Mar 26, 2011 at 3:55 PM, Daniel Begin > wrote: > > Hi all, > > > > I need someone to confirm the following about reference system... > > > > Context: Paul and I are uploading US-Canada boundary monuments/turning > > points to get a stable and verifiable information. The data is > > available from their web site and I got the confirmation that the data > > can be used without any restriction. The data can be found here... > > http://www.internationalboundarycommission.org/products.html > > > > and it is available for NAD27 and NAD83-SCRS reference system. > > > > Context: For what I understand, The difference between NAD83-SCRS and > > WGS84 is 0-2 meters. To get a rigorous transformation from NAD83-SCRS > > to WGS84 we need to use shift grids describing the shift between NAD83 > and NAD83-SCRS. > > These grids should be available through provincial agencies but I have > > been told that not all provinces have them available. > > > > Question1: Do I understand it properly? > > > > Question2: Considering that provided coordinates value/reference > > numbers can be read directly from their web site, it make sense for me > > to use NAD83-SCRS directly even if there is a 0-2 meter offset. Does > > it make sense for everyone? > > Bonjour Daniel! > > We do have others on this list with experience in re-projection. I hope > they'll join in. > > I've asked about the shift grids on #osm-dev. > > If I remember correctly, the current Can-US border came from IBC data. > How does the current border line match the monument data that you are > considering? Should they be identical and are they? Could we pop this > data into a tile overlay layer so we can look at it on existing OSM data > (without the import)? > > Best regards, > Richard > > ___ > Talk-ca mailing list > talk...@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk-ca ___ Talk-us mailing list Talk-us@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-us
