[talk-ph] Ultimate mapping challenge: marking the Station Balanacan in OSM

Ed Garcia eppgarcia at gmail.com
Fri Aug 12 10:00:03 BST 2011


Nope ... not the one in Marinduque.  But I tried to search for a few others
... one is actually in front of the engineering building in UP.  Another one
on the SLEX overpass in Sucat.

My friend who got to be part of the team that planted these points said that
these markers are usually points in existing structures.  Like tips of
towers, bridge posts, flag poles, etc.  When they do not have existing
structures, they make a "Mohon" that looks like lapidas with a brass rod
embeded in the center.

Example:
http://waypoints.ph/photo_detail.php?wpt=taalcv&passfile=taalcv07.jpg

I am not surprised at the GPS reading off by 6+ meters ... this is still
pretty much withing the usual EPE of handheld devices.

:>) ed



On Fri, Aug 12, 2011 at 4:12 PM, maning sambale
<emmanuel.sambale at gmail.com>wrote:

> Thanks ed,
>
> Has anyone from waypoints  or osm actually visited this reference point?
>
> I actually found a few of these markers.
>
> Example:
> http://www.openstreetmap.org/browse/node/1287703706
>
> My handheld GPS is off by 6.92 meters from the published PRS92 coordinates.
>
>
> On Thu, Aug 11, 2011 at 2:52 PM, Ed Garcia <eppgarcia at gmail.com> wrote:
> > Hi Maning,
> >
> > Take a look at:  http://waypoints.ph/gpsdata.php?wpt=MRQ1
> >
> > I thik that this is the same Balanacan Station refered to below.
> >
> > MRQ1 is just one of the 122 GPS station markers established during the
> PRS92
> > project.  As some will describe it, PRS92 is the "improved" or
> "corrected"
> > Luzon Datum  and these markers were supposedly set up by using highly
> > accurate GPS systems during the project.  I only knew now that this is
> Main
> > Reference.
> >
> > The coordinates on the website were already converted to WGS84 datum
> (from
> > PRS92 as printed on the brochures of the said project).
> >
> > The Station Markers are locate all over the Philippines, please look at:
> >
> > http://waypoints.ph/categmap.php?cat=GPS
> >
> >
> >
> > On Thu, Aug 11, 2011 at 10:55 AM, maning sambale
> > <emmanuel.sambale at gmail.com> wrote:
> >>
> >> The Balanacan Station is the main reference station for all surveying
> >> in the Philippines.  A great challenge for any pinoy OSMer to visit
> >> and mark. :)
> >>
> >>
> >>
> http://newsinfo.inquirer.net/39553/marinduque-town-plays-host-to-rock-marking-ph%E2%80%99s-center
> >>
> >>
> http://marinduquegov.blogspot.com/2008/08/balanacan-station-mother-of-all-surveys.html
> >>
> >> According to this pdf,
> >>
> >>
> http://gepwebportal.com/docs/dump2000/1211250715-RevisedRegulationsOnLandSurveys.pdf
> >>
> >> Location is approximately here:
> >>
> >>
> http://www.openstreetmap.org/?mlat=13.561389&mlon=121.8675&zoom=14&layers=M
> >> --
> >> cheers,
> >> maning
> >> ------------------------------------------------------
> >> "Freedom is still the most radical idea of all" -N.Branden
> >> wiki: http://esambale.wikispaces.com/
> >> blog: http://epsg4253.wordpress.com/
> >> ------------------------------------------------------
> >>
> >> _______________________________________________
> >> talk-ph mailing list
> >> talk-ph at openstreetmap.org
> >> http://lists.openstreetmap.org/listinfo/talk-ph
> >
> >
> >
> > --
> > website administrator:
> > - www.waypoints.ph
> > - reeflife.eppgarcia.com
> >
> > PADI Divemaster #491048
> >
>
>
>
> --
> cheers,
> maning
> ------------------------------------------------------
> "Freedom is still the most radical idea of all" -N.Branden
> wiki: http://esambale.wikispaces.com/
> blog: http://epsg4253.wordpress.com/
> ------------------------------------------------------
>



-- 
website administrator:
- www.waypoints.ph
- reeflife.eppgarcia.com

PADI Divemaster #491048
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