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Topic: OSGB36

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	BNGPlus - High-precision transformation between geographic ETRS89 (WGS84) and British National Grid OSGB36 coordinates ...
		The British National Grid, together with the geodetic reference system OSGB36 is a "traditional" national coordinate system based on a historically evolved network of triangulation stations and survey work and is not homogeneous throughout its coverage area, e.g.
		Unfortunately, the OSGB36 reference system in relation to the ETRS89 (or the WGS84) can not be defined very precisely by a mathematical model with the same single set of a few transformation parameters for the entire area of Great Britain.
		Ordnance Survey, the OS Symbol and OSGB36 are registered trademarks and OSTN02 is a trademark of Ordnance Survey, the national mapping agency of Great Britain.
	www.icsinger.de /bngplus.htm (793 words)

	Convert co-ordinates between WGS-84 and OSGB36
		In the UK, a latitude/longitude point in WGS84 (as generally used by GPS systems or any world-wide reference system) can be over 100 metres from the same latitude/longitude point in OSGB36 (as used in all Ordnance Survey mapping).
		If you are using Vincenty formulae for calculating distances between points on an ellipsoidal model of the earth, these differences can become relevant.
		I have also done a script for converting between (OSGB36) lat/long and OS grid references.
	www.movable-type.co.uk /scripts/latlong-convert-coords.html (439 words)

	Welcome to OS Net
		OSGB36 National Grid is the national standard coordinate system for topographic mapping, including all OS mapping, and for geographically referencing many kinds of information in relation to OS mapping.
		These coordinates can be instantly and precisely transformed to OSGB36, National Grid and ODN height coordinates (or to a project-specific mapping grid if appropriate).
		Therefore, it is feasible for a greater range of mapping, engineering and environmental projects to use precise national coordinates than was previously possible.
	www.ordnancesurvey.co.uk /oswebsite/gps/osnetfreeservices/about/overview_osnet.html (1151 words)

	[No title]
		During the period of conversion, it is inevitable that some adjoining or larger scale or smaller scale charts will be referred to different datums for a limited time.
		To transfer a position from a chart referred to a WGS84 compatible datum to charts and documents referred to OSGB36 Datum, refer to the charted National Horizontal Datum note.
		When transferring positions from charts referred to OSGB36 Datum to charts referred to a WGS84 compatible datum, the lat/long adjustments to be applied to the positions are in the reverse direction to those shown in the Satellite–Derived Positions notes on the OSGB36 Datum charts.
	www.mcga.gov.uk /c4mca/mcga-mld-page.htm?textobjid=B7B379C78BB40CC2 (645 words)

	OSGB36
		This calculator is provided to help convert co-ordinates, based on the OSGB36 datum, to the WGS84 datum.
		It is intended for use only for UK co-ordinates along the South Coast of England, and its accuracy is only approximate.
		If so, then please send a mail message to
	www.bsac-se.org.uk /OSGB36.asp (59 words)

	GPS Notes: Convert WGS 84 coordinates into OSGB36 National Grid
		A number of people (geocachers usually) have emailed me wanting to know how to convert WGS 84 coordinates into OSGB36 National Grid.
		Just change the coordinates settings into WGS 84, enter the coordinates and then change coordinates system to OSGB36 National Grid.
		You'll need to consult you manual to find out how to do this but it's one of the simplest ways to carry out the conversion.
	www.hacking-gps.com /gps-notes/archives/2006/01/convert_wgs_84.php (246 words)

	National GPS Network information: surveying with the National GPS Network
		The OSGB36 part of the name refers to the geodetic datum (system of latitude and longitude) used, and the National Grid part refers to the map projection and grid referencing convention for eastings and northings.
		The grids of shift parameters were obtained by computing the ETRS89 GPS coordinates of thousands of primary and secondary OSGB36 triangulation stations, and fitting a transformation surface to the discrepancies between projected ETRS89 coordinates and the archive coordinates of the OSGB36 stations.
		The reverse transformation procedure (OSGB36 to ETRS89) is slightly more involved because an iterative procedure is needed to discover the point at which the transformation shifts should be calculated, but the result is exact.
	gps.ordnancesurvey.co.uk /gpssurveying.asp (3999 words)

	[Manifold-l] Custom datums
		To provide a bit of context to this discussion we are usually dealing with projects with dimensions of perhaps only a few hundred metres, at resolutions in decimetres and yes, we are surveyors.
		The problem arises when GPS long lat is used in conjunction with OSGB36 which results in errors of several metres relative to digital mapping from Ordance Survey who use the more accurate OSTN02 transformation.
		This offset is essentially a measure of the local error in the original OS mapping and allows 'true' co-ordinates from GPS to be mapped into OSGB36.
	www.directionsmag.com /pipermail/manifold-l/2006-September/001910.html (532 words)

	[No title]
		A programme to transfer Admiralty charts of the British Isles from OSGB36 Datum (or OSI Datum) to a WGS84 compatible datum commenced in June 2000.
		To transfer a position from a chart referred to a WGS84 compatible datum to charts and documents referred to OSGB36 Datum refer to the charted National Horizontal Datum note.
		When transferring positions from charts referred to OSGB36 Datum to charts referred to a WGS84 compatible datum, the lat/long adjustments to be applied to the positions are in the reverse direction to those shown in the Satellite—Derived Positions notes on the OSGB36 Datum charts.
	www.ybw.com /forums/printthread.php/Board/pbo/main/775261/type/post (311 words)

	[No title]
		The accuracy of the results will vary, depending how closely the local datum relates to the ellipsoid on which it is based.
		For example, the UK OSGB36 datum transformation should be within 4 metres in any direction.
		The errors appropriate to each datum are shown in the NATO document.
	www.carabus.co.uk /uk2wgs.html (256 words)

	UCL Department of Geomatic Engineering - Home Page :: Courses :: MSc Taught Degrees :: Surveying :: 2003 :: Assessing ... (Site not responding. Last check: 2007-10-29)
		This inevitably led to the absolute accuracy of the mapping to be better in some areas, and worse in others.
		In an attempt to rectify this, the Ordnance Survey have released their ‘definitive’ transformation to switch between ETRS89 and OSGB36.
		This proposal gives details including increasing the sizes and locations of the areas to be surveyed, and increasing the amount of features within each area in an attempt to give a more full and representative model for the transformation.
	www.ge.ucl.ac.uk /courses/msc_taught_degrees/surveying/2003/assessing_the_accuracy_of_ostn02_through_the_use_of_gps_and_ostn02 (523 words)

	GpsPasSion Forums - Fortuna GPSmart NMEA output broken?
		As most software that reads NMEA wants the output to be in WGS84 I would like to switch it to that but changing the datum in the setup only affects the diaplyed position and not the output one.
		It's even more curious as although the NMEA output is fairly close to the OSGB36 datum it's not the same as that either.
		It seems that when the GPSmart datum is set to WGS84 it actually outputs NMEA in OSGB36 and when the datum is set to OSGB36 it outputs the NMEA in something else entirely.
	www.gpspassion.com /forumsen/topic.asp?TOPIC_ID=4156 (464 words)

	New Page 0
		5.3 the relationship between OSGB36 and ETRF89 for petroleum exploration and production purposes be declared to be the OSGB petroleum transformation.
		OSGB petroleum transformation parameters from ETRF89 (WGS84) to OSGB36
		5.4 the relationship between OSGB36 and ED50 for petroleum exploration and production purposes is the concatenation of the OSGB36 to ETRF89 and ETRF89 to ED50 transformations in recommendations 5.2 and 5.3 above, known as the UKOOA landward/seaward transformation.
	www.databydesign.co.uk /energy/ukdata/pon_4.htm (1930 words)

	National GPS Network - Information
		Before the launch of this web site, there was a lack of precisely coordinated and monitored GPS reference stations in Great Britain, and it could be expensive to buy their coordinates.
		OS does not give any guarantees of the accuracy of archive OSGB36 coordinates, neither does it monitor the stability of OSGB36 monuments (with the exception of the clearly marked trig pillars which have been re used as passive GPS stations).
		While it is true that two adjacent OSGB36 triangulation stations are usually in agreement with each other to within a few centimetres, if we compare two triangulation stations 10 km apart by measuring a precise GPS vector, we will typically find an error of several decimetres in their relative archive coordinates.
	gps.ordnancesurvey.co.uk /faq.asp (4950 words)

	dti: Oil and Gas Directorate - Regulation: PONs
		The OSGB petroleum transformation is an operation using the position vector transformation method and the following specified set of Helmert transformation parameters for changing co-ordinates between OSGB36 (British National Grid) and ETRF89 or WGS84 co-ordinate systems.
		OSGB petroleum transformation parameters from ETRF89 (WGS84) to OSGB36
		5.4 the relationship between OSGB36 and ED50 for petroleum exploration and production purposes is the concatenation of the OSGB36 to ETRF89 and ETRF89 to ED50 transformations in recommendations 5.2 and 5.3 above, known as the UKOOA landward/seaward transformation.
	www.og.dti.gov.uk /regulation/pons/pon_04.htm (2259 words)

	Cartographica.Com: Ordnance Survey tries to make GPS in UK more accurate
		The services center around mapping GPS information to the UK national coordinate systems, specifically ETRS89, OSGB36, and ODN from WGS84, the primary GPS coordinate system.
		The key benefit is that the resultant coordinates match exactly what you would expect to find on ground-surveyed maps and take into account all of the peculiarities of the GPS network.
		Beyond this, they are also posting a database of 900+ passive GPS stations that can be used as marking points when correcting GPS data.
	www.cartographica.com /article.php?story=20060424231415814&mode=print (217 words)

	GpsPasSion Forums
		My BNG-LatLong was creating OSGB36 Lat Longs, whereas my XYZtoLLA routine was creating WSG84 Lat Longs.
		I have now added a conversion from the OSGB36->WSG84 for the database (seeing as this is done ONCE) and now my database appears to be pretty close to where I want to be, albeit with possibility for a few metres off (which I have to investigate further).
		I am wondering if the OSGB36 Long 0 is Grenwich or if the WSG84 Long 0 is. --- I have learned from experience that a modicum of snuff can be most efficacious [/quote]
	www.gpspassion.com /forumsen/post.asp?method=ReplyQuote&REPLY_ID=364919&TOPIC_ID=61567&FORUM_ID=140 (360 words)

	Simulating GPS In Urban Traffic Environments - GPS World
		Trajectory input tool: enables outputs from GPS processing software to be read and records displayed as a new mapping layer.
		To overlay the trajectory outputs on the map data used, the WGS84 coordinates used by the GPS processing software had to be converted into the UK National Grid coordinate referencing system (OSGB36).
		The tool enables the user to choose which records to display and includes safety mechanisms to prevent accidental data corruption.
	www.gpsworld.com /gpsworld/article/articleDetail.jsp?id=87525&sk=&date=&pageID=3 (1764 words)

	The Hydrographic Society - Technical Articles - Co-ordinate Systems for UKCS Petroleum Exploration and Production ... (Site not responding. Last check: 2007-10-29)
		Besides declaring the geographic co-ordinate systems to use, the Gazette notice also declares the transformations applicable for petroleum purposes between ED50, ETRF89, OSGB36 and the GPS satellite navigation system's co-ordinate frame WGS 84.
		Co-ordinates describing a position on the earth are only unambiguous if the co-ordinate system to which they are referenced is identified.
		OSGB petroleum transformation parameters from ETRF89 (WGS 84) to OSGB36
	www.hydrographicsociety.org /Articles/journal/2000/96-1.htm (2209 words)

	Biologie - OSGB36
		Wenn Sie am Artikel OSGB36 etwas ÄNDERN oder HINZUFÜGEN möchten, so können sie das HIER tun.
		Besonders interessant wären Zusatzinformationen zu biologischen Themen: Also zum BEISPIEL Schadstoffausstoßwerte von Kraftfahrzeugen, berühmte Personen die an Umwelthemen arbeiten oder Ihnen entgegenstehen.
		Das Ordnance Survey Great Britain 1936 (OSGB36) ist die geodätische Grundlage der Vermessung von Großbritannien.
	www.biologie.de /biowiki/OSGB36 (137 words)

	phpcoord Test Script
		Note that the OSGB-Latitude/Longitude conversions use the OSGB36 datum by default.
		The majority of applications use the WGS84 datum, for which the appropriate conversions need to be added.
		Using OSGB36 (convert an OSGB grid reference to a latitude and longitude using the OSGB36 datum):
	www.jstott.me.uk /phpcoord/test-2.3.php (391 words)

	Professional Boatmans Association: Fishing and Diving Issues
		The default for most GPS sets is WGS84 (World Geodetic System 1984) however the Admiralty charts are based on OSGB36 (Ordinance Survey of Great Britain 1936).
		Personally I always work in WGS84 and apply the necessary correction when using charts (The correction to apply is shown on all modern charts).
		Try to find out which system was used to provide any positions you are given.
	www.pba.org.uk /issues.shtml (2885 words)

	[No title]
		Two such agreements have been declared: WGS84 in North America and OSGB36 in the UK.
		A table will be prepared of the 26 common datums.
		Here are some examples: W = WGS84 N = NAD27 O = OSGB36 LOCAL CUSTOM: For special and closed events, the DATUM can be one of ten locally defined options.
	web.usna.navy.mil /~bruninga/aprs/datum.txt (795 words)

	[No title]
		Two such agreements have been declared: WGS84 in North America and OSGB36 in the UK.
		A table will be prepared of the 26 common datums.
		Here are some examples: W = WGS84 N = NAD27 O = OSGB36 LOCAL CUSTOM: For special and closed events, the DATUM can be one of ten locally defined options.
	www.ew.usna.edu /~bruninga/aprs/datum.txt (795 words)

	The Megalithic Portal and Megalith Map:
		In my opinion is to set the GPS receivers to the OSGB36 map date only a bad workaround.
		When you enter coordinates to the GPS device manually, then is it no problem (but it is a time-consuming business, because you have no alpha-numerical keyboard).
		Both OSGB36 and WGS84 mapdates were calculated (if programs support it).
	www.megalithic.co.uk /modules.php?op=modload&name=Forum&file=viewtopic&topic=368&forum=5&start=6 (1719 words)

	Groundspeak Forums > Ordnance Survey grid references anyone?
		In the UK, all good walking maps are based on the OS National Grid, so it seems odd that anyone would choose HDDD MM.MM...
		You may have to upgrade the firmwear of your GPS to allow this though.
		A couple of weeks ago, we foolishly ignored the recommendation in GC675F to "follow the easier path via N 53 17.820 / W 002 12.322".
	forums.groundspeak.com /GC/lofiversion/index.php?t40069.html (3061 words)

	OSGB Convert (Site not responding. Last check: 2007-10-29)
		This is a component that can be called from Visual Basic, C#, or whatever, that will convert from OSGB grid references to Latitude and Longitude.
		This uses the OSGB36 to WGS84 Helmert Transform, something that old versions of MapPoint do not.
		Enter the OSGB grid reference of your favourite roundabout.
	www.anotherurl.com /mapping/OSGB_Convert.htm (225 words)

	Yachting and Boating World: Chart positions transfered from minutes to decimal to wgs
		The positions are given in minutes and seconds of arc, generaly Hi Fix and Syledis in origin and based on a 'NG' horizontal datum which I take to be OSGB36.
		To bring them forward into a useable wgs format I intend to convert to decimal and assume OSGB36 and then convert using relevent chart correction for changing OSGB36 to WGS84.
		Does this sound the right way and if so what level of error might be introduced and where.
	www.ybw.com /forums/showflat.php?Number=801878&page=0 (592 words)

	Convert WGS84 to OSGB36 - Franson CoordTrans
		Again, you will need to browse to the appropriate region and select the grid.
		OSGB36 is available in the United Kingdom, which you can locate by clicking "The Earth -> Europe -> United Kingdom".
		Enter a coordinate to convert from WGS84 to OSGB36.
	franson.com /coordtrans/guide.asp?section=Datum2Datum&platform=winxp (203 words)

	Coordinates converted between ETRS89(WGS84) and Ordinance Survey(OSGB36) (Site not responding. Last check: 2007-10-29)
		This web application uses the Ordnance Survey National Grid Transformation (OSTN02) to convert coordinates between the National Grid (OSGB36) and the European Terrestrial Reference System (ETRS89); for use with GPS receivers and the WGS84 datum.
		If you would like to convert from OS type coordinates(eg SN 89876.876 25368.258), push the button on the left of the OS logo.
		Remember to include your e-mail address if you would like a reply.
	www.osconverter.co.uk (295 words)

	GPS information - Merrett Survey Partnership - topographic land survey company
		Note that hand held receivers in differential mode may achieve +/- 1m for position - worse for height.
		Beware of ‘generalised’ transformations for OSGB36 - 24m variation across UK.
		WGS84 must be transformed to ‘local’ map projection eg OSGB36 or UTM.
	www.merrettsurvey.co.uk /gpsinfo.htm (992 words)

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