Re: [talk-ph] Ultimate mapping challenge: marking the Station Balanacan in OSM
100ths of a second would then mean an accuracy of about 28 centimeters or less than a foot. The manhole cover is certainly larger than a foot so it's extremely accurate indeed. On Fri, Aug 12, 2011 at 4:54 PM, Jim Morgan wrote: > maning sambale wrote, On Friday, 12 August, 2011 04:12 PM: >> My handheld GPS is off by 6.92 meters from the published PRS92 coordinates. > > That reminded me, I was walking down the street the other day in Makati, and > I came across a manhole cover. It had a detailed GPS co-ordinate engraved on > it. > http://dl.dropbox.com/u/274900/DSC00341.JPG > > The co-ordinates were accurate down to 1/100th of a second, which seems quite > precise (one second is around 28 metres at this latitude). I was wondering if > this is common to all areas / cities, and if so, can we use it for something > - aligning or verifying roads. > > Also ... maybe roadworks departments have records of these that they'd be > prepared to release? > > Jim > > > > -- > > datalude: information security > e: j...@datalude.com > Philippines: +63 2 403 1311 / mob: +63 917 849 3939 > Hong Kong: +852 6840 6693 > w: http://www.datalude.com/ ___ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Ultimate mapping challenge: marking the Station Balanacan in OSM
Dear Ed, We don't have to convert anymore. If anyone wants the file of all the geodetic markers, so they can visit them, PM me. ;) On Fri, Aug 12, 2011 at 8:03 PM, Ed Garcia wrote: > some years ago I tried locating LAG2 when I frequented the Caliraya area, > but could not find it. My old GPS that time (Magelan GPS315, with position > error of about 14 meters) kept on pointing me to an area several meters > north of the junction where I could not find any possible markers. > > Maybe my GPS was not accurate enough, or maybe the data I was using was > converted wrongly (came from PRS92 and recalculated to wgs84), or the marker > is gone, or the brass rod is indeed right at the junction of the two roads. > > Anyway, here is the history of the coordinates ... > > Below are the original values of the coordinates in PRS92. To convert it to > WGS84, I first manually inputted them into GPS Utility which was set to > Luzon Datum while I was keying-in the values (no PRS92 on GPS Utility back > then). Then, I changed the datum on GPS Utility which automatically > recalculated the values into WGS84. > > This was based on what I have been told, that the difference between PRS92 > and Luzon datum is very very minimal. Btw, the difference between Luzon and > WGS84 is over a hundred meters. > > Perhaps Maning can do some recalculations based on the original PRS92? > > H SOFTWARE NAME & VERSION > I GPSU 4.03 REGISTERED to 'sloovey' > S DateFormat=yy-mm-dd > S Timezone=8 > S Units=M,M > S SymbolSet=0 > > H R DATUM > M E Luzon Philippines 048 -6.940E+01 -3.7264640E-05 -133 -77 -51 > > H COORDINATE SYSTEM > U LAT LON DMS > > F ID Latitude Longitude T O Alt(m) Comment > W ABR1 N17°36'16.84" E120°36'49.89" I E 0.0 ABRA > W ABR2 N17°34'22.27" E120°54'09.10" I E 0.0 ABRA > W ARA1 N15°45'31.27" E121°33'42.42" I E 0.0 AURORA > W ARA2 N16°08'41.60" E121°57'21.90" I E 0.0 AURORA > W ARA3 N16°25'00.80" E122°14'17.45" I E 0.0 AURORA > W BGT1 N16°24'05.20" E120°38'41.85" I E 0.0 BENGUET > W BGT2 N16°35'55.95" E120°45'39.28" I E 0.0 BENGUET > W BGT3 N16°36'03.38" E120°45'41.25" I E 0.0 BENGUET > W BLN1 N14°56'32.01" E120°52'47.62" I E 0.0 BULACAN > W BLN2 N14°50'53.22" E120°45'48.04" I E 0.0 BULACAN > W BLN3 N14°54'20.77" E121°02'29.98" I E 0.0 BULACAN > W BLN4 N15°11'29.35" E121°02'34.71" I E 0.0 BULACAN > W BTG1 N13°49'13.21" E120°57'20.62" I E 0.0 BATANGAS > W BTG2 N14°05'02.10" E120°37'09.73" I E 0.0 BATANGAS > W BTG3 N13°40'30.09" E121°26'59.60" I E 0.0 BATANGAS > W BTG4 N13°32'08.42" E121°05'50.70" I E 0.0 BATANGAS > W BTG5 N13°38'13.43" E121°02'04.03" I E 0.0 BATANGAS > W BTG6 N13°38'13.98" E121°11'38.09" I E 0.0 BATANGAS > W BTG7 N13°37'24.68" E121°04'51.35" I E 0.0 BATANGAS > W BTG8 N13°44'35.19" E120°56'46.59" I E 0.0 BATANGAS > W BTN1 N14°35'06.85" E120°34'28.59" I E 0.0 BATAAN > W BTN2 N14°22'52.15" E120°34'30.50" I E 0.0 BATAAN > W BTN3 N14°26'37.79" E120°29'50.07" I E 0.0 BATAAN > W CVT1 N14°16'57.90" E120°59'44.17" I E 0.0 CAVITE > W CVT2 N14°16'58.43" E120°51'49.28" I E 0.0 CAVITE > W IFG1 N16°55'19.86" E121°03'00.82" I E 0.0 IFUGAO > W ILN1 N18°23'47.43" E120°35'44.45" I E 0.0 ILOCOS NORTE > W ILN2 N17°58'11.10" E120°30'45.59" I E 0.0 ILOCOS NORTE > W ILN3 N18°05'10.64" E120°48'48.30" I E 0.0 ILOCOS NORTE > W ILS1 N17°35'53.36" E120°23'23.21" I E 0.0 ILOCOS SUR > W ILS2 N17°07'58.01" E120°26'32.72" I E 0.0 ILOCOS SUR > W ILS3 N16°58'50.36" E120°44'13.31" I E 0.0 ILOCOS SUR > W LAG1 N14°15'51.25" E121°23'48.53" I E 0.0 LAGUNA > W LAG2 N14°26'12.62" E121°26'52.34" I E 0.0 LAGUNA > W LAG3 N14°11'00.92" E121°08'46.49" I E 0.0 LAGUNA > W LAG4 N14°20'04.08" E121°03'10.64" I E 0.0 LAGUNA > W LAG5 N14°20'37.90" E121°02'54.05" I E 0.0 LAGUNA > W LUN1 N16°35'02.94" E120°18'11.21" I E 0.0 LA UNION > W LUN2 N16°21'37.74" E120°21'36.44" I E 0.0 LA UNION > W LUN3 N16°15'37.22" E120°21'58.28" I E 0.0 LA UNION > W MMA0 N14°38'12.09" E121°02'30.07" I E 0.0 MANILA > W MMA1 N14°32'19.06" E121°02'18.24" I E 0.0 MANILA > W MMA5 N14°39'28.40" E121°04'06.26" I E 0.0 MANILA > W MMA6 N14°35'59.16" E120°58'18.25" I E 0.0 MANILA > W MPV1 N17°05'39.22" E120°58'03.60" I E 0.0 MOUNTAIN PROVINCE > W PMG1 N15°08'30.22" E120°37'54.75" I E 0.0 PAMPANGA > W PNG2 N16°23'41.54" E119°52'49.35" I E 0.0 PANGASINAN > W PNG3 N16°03'53.52" E120°06'23.69" I E 0.0 PANGASINAN > W PNG4 N15°54'46.30" E120°38'25.41" I E 0.0 PANGASINAN > W PNG5 N15°52'09.25" E120°15'08.49" I E 0.0 PANGASINAN > W PNG6 N16°02'45.87" E120°19'39.03" I E 0.0 PANGASINAN > W RZL N14°29'02.31" E121°11'11.83" I E 0.0 RIZAL > W RZL2 N14°27'53.61" E1
Re: [talk-ph] Ultimate mapping challenge: marking the Station Balanacan in OSM
some years ago I tried locating LAG2 when I frequented the Caliraya area, but could not find it. My old GPS that time (Magelan GPS315, with position error of about 14 meters) kept on pointing me to an area several meters north of the junction where I could not find any possible markers. Maybe my GPS was not accurate enough, or maybe the data I was using was converted wrongly (came from PRS92 and recalculated to wgs84), or the marker is gone, or the brass rod is indeed right at the junction of the two roads. Anyway, here is the history of the coordinates ... Below are the original values of the coordinates in PRS92. To convert it to WGS84, I first manually inputted them into GPS Utility which was set to Luzon Datum while I was keying-in the values (no PRS92 on GPS Utility back then). Then, I changed the datum on GPS Utility which automatically recalculated the values into WGS84. This was based on what I have been told, that the difference between PRS92 and Luzon datum is very very minimal. Btw, the difference between Luzon and WGS84 is over a hundred meters. Perhaps Maning can do some recalculations based on the original PRS92? H SOFTWARE NAME & VERSION I GPSU 4.03 REGISTERED to 'sloovey' S DateFormat=yy-mm-dd S Timezone=8 S Units=M,M S SymbolSet=0 H R DATUM M ELuzon Philippines 048 -6.940E+01 -3.7264640E-05 -133 -77 -51 H COORDINATE SYSTEM U LAT LON DMS F ID Latitude Longitude T O Alt(m) Comment W ABR1 N17°36'16.84" E120°36'49.89" I E 0.0 ABRA W ABR2 N17°34'22.27" E120°54'09.10" I E 0.0 ABRA W ARA1 N15°45'31.27" E121°33'42.42" I E 0.0 AURORA W ARA2 N16°08'41.60" E121°57'21.90" I E 0.0 AURORA W ARA3 N16°25'00.80" E122°14'17.45" I E 0.0 AURORA W BGT1 N16°24'05.20" E120°38'41.85" I E 0.0 BENGUET W BGT2 N16°35'55.95" E120°45'39.28" I E 0.0 BENGUET W BGT3 N16°36'03.38" E120°45'41.25" I E 0.0 BENGUET W BLN1 N14°56'32.01" E120°52'47.62" I E 0.0 BULACAN W BLN2 N14°50'53.22" E120°45'48.04" I E 0.0 BULACAN W BLN3 N14°54'20.77" E121°02'29.98" I E 0.0 BULACAN W BLN4 N15°11'29.35" E121°02'34.71" I E 0.0 BULACAN W BTG1 N13°49'13.21" E120°57'20.62" I E 0.0 BATANGAS W BTG2 N14°05'02.10" E120°37'09.73" I E 0.0 BATANGAS W BTG3 N13°40'30.09" E121°26'59.60" I E 0.0 BATANGAS W BTG4 N13°32'08.42" E121°05'50.70" I E 0.0 BATANGAS W BTG5 N13°38'13.43" E121°02'04.03" I E 0.0 BATANGAS W BTG6 N13°38'13.98" E121°11'38.09" I E 0.0 BATANGAS W BTG7 N13°37'24.68" E121°04'51.35" I E 0.0 BATANGAS W BTG8 N13°44'35.19" E120°56'46.59" I E 0.0 BATANGAS W BTN1 N14°35'06.85" E120°34'28.59" I E 0.0 BATAAN W BTN2 N14°22'52.15" E120°34'30.50" I E 0.0 BATAAN W BTN3 N14°26'37.79" E120°29'50.07" I E 0.0 BATAAN W CVT1 N14°16'57.90" E120°59'44.17" I E 0.0 CAVITE W CVT2 N14°16'58.43" E120°51'49.28" I E 0.0 CAVITE W IFG1 N16°55'19.86" E121°03'00.82" I E 0.0 IFUGAO W ILN1 N18°23'47.43" E120°35'44.45" I E 0.0 ILOCOS NORTE W ILN2 N17°58'11.10" E120°30'45.59" I E 0.0 ILOCOS NORTE W ILN3 N18°05'10.64" E120°48'48.30" I E 0.0 ILOCOS NORTE W ILS1 N17°35'53.36" E120°23'23.21" I E 0.0 ILOCOS SUR W ILS2 N17°07'58.01" E120°26'32.72" I E 0.0 ILOCOS SUR W ILS3 N16°58'50.36" E120°44'13.31" I E 0.0 ILOCOS SUR W LAG1 N14°15'51.25" E121°23'48.53" I E 0.0 LAGUNA W LAG2 N14°26'12.62" E121°26'52.34" I E 0.0 LAGUNA W LAG3 N14°11'00.92" E121°08'46.49" I E 0.0 LAGUNA W LAG4 N14°20'04.08" E121°03'10.64" I E 0.0 LAGUNA W LAG5 N14°20'37.90" E121°02'54.05" I E 0.0 LAGUNA W LUN1 N16°35'02.94" E120°18'11.21" I E 0.0 LA UNION W LUN2 N16°21'37.74" E120°21'36.44" I E 0.0 LA UNION W LUN3 N16°15'37.22" E120°21'58.28" I E 0.0 LA UNION W MMA0 N14°38'12.09" E121°02'30.07" I E 0.0 MANILA W MMA1 N14°32'19.06" E121°02'18.24" I E 0.0 MANILA W MMA5 N14°39'28.40" E121°04'06.26" I E 0.0 MANILA W MMA6 N14°35'59.16" E120°58'18.25" I E 0.0 MANILA W MPV1 N17°05'39.22" E120°58'03.60" I E 0.0 MOUNTAIN PROVINCE W PMG1 N15°08'30.22" E120°37'54.75" I E 0.0 PAMPANGA W PNG2 N16°23'41.54" E119°52'49.35" I E 0.0 PANGASINAN W PNG3 N16°03'53.52" E120°06'23.69" I E 0.0 PANGASINAN W PNG4 N15°54'46.30" E120°38'25.41" I E 0.0 PANGASINAN W PNG5 N15°52'09.25" E120°15'08.49" I E 0.0 PANGASINAN W PNG6 N16°02'45.87" E120°19'39.03" I E 0.0 PANGASINAN W RZLN14°29'02.31" E121°11'11.83" I E 0.0 RIZAL W RZL2 N14°27'53.61" E121°11'46.73" I E 0.0 RIZAL W KAY2 N17°24'33.60" E121°26'31.83" I E 0.0 KALINGA APAYAO W KAY3 N18°14'23.89" E121°22'08.80" I E 0.0 KALINGA APAYAO W QZN1 N14°06'12.00" E122°00'50.11" I E 0.0 QUEZON W QZN2 N14°42'13.15" E122°19'34.67" I E 0.0 QUEZON W QZN3 N14°55'36.18" E121°48'19.47" I E 0.0 QUEZON W QZN4 N14
Re: [talk-ph] Ultimate mapping challenge: marking the Station Balanacan in OSM
hmmm...i always pass by unknowingly near LAG2 marker. will try to locate it exactly. there's a nearby gas station and the raymond bus terminal there near Famy/Siniloan along manila east road is it a landmark or just the junction of the two roads? On Fri, Aug 12, 2011 at 4:12 PM, maning sambale 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. > > -- > --- > I explore, therefore I blog. > > http://www.backpackingphilippines.com > > ___ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Ultimate mapping challenge: marking the Station Balanacan in OSM
Manila Water Co actually mark their water meters by GPS. And they do use those sub-centimeter accurate GPS equipment. I saw them mark our water meter a few months ago. They say they also do this to mark where their supply pipes are. On Fri, Aug 12, 2011 at 4:54 PM, Jim Morgan wrote: > maning sambale wrote, On Friday, 12 August, 2011 04:12 PM: > > My handheld GPS is off by 6.92 meters from the published PRS92 > coordinates. > > That reminded me, I was walking down the street the other day in Makati, > and I came across a manhole cover. It had a detailed GPS co-ordinate > engraved on it. >http://dl.dropbox.com/u/274900/DSC00341.JPG > > The co-ordinates were accurate down to 1/100th of a second, which seems > quite precise (one second is around 28 metres at this latitude). I was > wondering if this is common to all areas / cities, and if so, can we use it > for something - aligning or verifying roads. > > Also ... maybe roadworks departments have records of these that they'd be > prepared to release? > > Jim > > > > -- > > datalude: information security > e: j...@datalude.com > Philippines: +63 2 403 1311 / mob: +63 917 849 3939 > Hong Kong: +852 6840 6693 > w: http://www.datalude.com/ > > ___ > talk-ph mailing list > talk-ph@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk-ph > -- website administrator: - www.waypoints.ph - reeflife.eppgarcia.com PADI Divemaster #491048 ___ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Ultimate mapping challenge: marking the Station Balanacan in OSM
Jim Morgan wrote, On Friday, 12 August, 2011 04:54 PM: > That reminded me, I was walking down the street the other day in Makati, and > I came across a manhole cover. It had a detailed GPS co-ordinate engraved on > it. > http://dl.dropbox.com/u/274900/DSC00341.JPG To save you all the trouble, I just converted the lat/long to decimal and put it into OSM http://www.openstreetmap.org/?mlat=14.56233&mlon=121.01716&zoom=17&layers=B000FTF Jim -- datalude: information security e: j...@datalude.com Philippines: +63 2 403 1311 / mob: +63 917 849 3939 Hong Kong: +852 6840 6693 w: http://www.datalude.com/ ___ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Ultimate mapping challenge: marking the Station Balanacan in OSM
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 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 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 > > 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@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 ___ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Ultimate mapping challenge: marking the Station Balanacan in OSM
maning sambale wrote, On Friday, 12 August, 2011 04:12 PM: > My handheld GPS is off by 6.92 meters from the published PRS92 coordinates. That reminded me, I was walking down the street the other day in Makati, and I came across a manhole cover. It had a detailed GPS co-ordinate engraved on it. http://dl.dropbox.com/u/274900/DSC00341.JPG The co-ordinates were accurate down to 1/100th of a second, which seems quite precise (one second is around 28 metres at this latitude). I was wondering if this is common to all areas / cities, and if so, can we use it for something - aligning or verifying roads. Also ... maybe roadworks departments have records of these that they'd be prepared to release? Jim -- datalude: information security e: j...@datalude.com Philippines: +63 2 403 1311 / mob: +63 917 849 3939 Hong Kong: +852 6840 6693 w: http://www.datalude.com/ ___ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Ultimate mapping challenge: marking the Station Balanacan in OSM
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 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 > 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@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/ -- ___ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Ultimate mapping challenge: marking the Station Balanacan in OSM
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 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@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk-ph > -- website administrator: - www.waypoints.ph - reeflife.eppgarcia.com PADI Divemaster #491048 ___ talk-ph mailing list talk-ph@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ph
