thoughts-on-extending-the-geo-microformat - Revision history

RyanKing: Reverted edits by LiorrEltrz (Talk) to last version by AndyMabbett

2008-12-18T04:06:27Z

Reverted edits by LiorrEltrz (Talk) to last version by AndyMabbett

← Older revision		Revision as of 04:06, 18 December 2008
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	~~cnaorpasd~~
	'''This page and effort is failing to follow the microformats [[process]]. If you are the author of this page, please join the [http://microformats.org/discuss #microformats IRC channel and/or microformats-discuss mailing list] so that the community can help walk you through the process.''' - Tantek		'''This page and effort is failing to follow the microformats [[process]]. If you are the author of this page, please join the [http://microformats.org/discuss #microformats IRC channel and/or microformats-discuss mailing list] so that the community can help walk you through the process.''' - Tantek

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	<blockquote>		<blockquote>
	Spacetimes are the arenas in which all physical events take place ~~â~~ for example, the motion of planets around the Sun may be described in a particular type of spacetime, or the motion of light around a rotating star may be described in another type of spacetime. The basic elements of spacetime are events. In any given spacetime, an event is a '''unique position''' at a '''unique time'''. Examples of events include the explosion of a star or the single beat of a drum. [http://en.wikipedia.org/wiki/Timespace Spacetime, Wikipedia] (annotation by the author)		Spacetimes are the arenas in which all physical events take place — for example, the motion of planets around the Sun may be described in a particular type of spacetime, or the motion of light around a rotating star may be described in another type of spacetime. The basic elements of spacetime are events. In any given spacetime, an event is a '''unique position''' at a '''unique time'''. Examples of events include the explosion of a star or the single beat of a drum. [http://en.wikipedia.org/wiki/Timespace Spacetime, Wikipedia] (annotation by the author)
	</blockquote>		</blockquote>

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	It should be noted that the assumption about the datum used in expressing the lat-long coordinates mentioned above, is not a trivial one: Only 20 years ago, the same coordinates would possibly point hundreds of meters away from the Parthenon, since the reference system used at that time was different than WGS84. Furthermore, assuming WGS84 was the datum for the markup above, these coordinates may not be accurate 10 years from today, when the WGS84 reference system will have been revised once again.		It should be noted that the assumption about the datum used in expressing the lat-long coordinates mentioned above, is not a trivial one: Only 20 years ago, the same coordinates would possibly point hundreds of meters away from the Parthenon, since the reference system used at that time was different than WGS84. Furthermore, assuming WGS84 was the datum for the markup above, these coordinates may not be accurate 10 years from today, when the WGS84 reference system will have been revised once again.

	A markable indication of the importance of the reference system, when expressing geo coordinates, is the fact that the Greenwich Observatory, which was by definition the origin for the longitude coordinate for more than a century, lies now about 102.5m West of the WGS84 0.0 meridian, at N ~~51Â°~~ 28' 36.71, W ~~0Â°~~ 0' 5.18", (in WGS84 datum) according to [http://en.wikipedia.org/wiki/Prime_Meridian Wikipedia, Prime_Meridian]. Interestingly, Google maps and Wikipedia do not seem to agree on these coordinates [http://maps.google.com/maps?f=q&hl=en&q=51.476864,-0.000518&ie=UTF8&z=19&ll=51.476861,-0.000515&spn=0.001067,0.002175&t=h&om=1&iwloc=addr map]		A markable indication of the importance of the reference system, when expressing geo coordinates, is the fact that the Greenwich Observatory, which was by definition the origin for the longitude coordinate for more than a century, lies now about 102.5m West of the WGS84 0.0 meridian, at N 51° 28' 36.71, W 0° 0' 5.18", (in WGS84 datum) according to [http://en.wikipedia.org/wiki/Prime_Meridian Wikipedia, Prime_Meridian]. Interestingly, Google maps and Wikipedia do not seem to agree on these coordinates [http://maps.google.com/maps?f=q&hl=en&q=51.476864,-0.000518&ie=UTF8&z=19&ll=51.476861,-0.000515&spn=0.001067,0.002175&t=h&om=1&iwloc=addr map]
	<span class="geo">		<span class="geo">
	<abbr class="latitude" title="51.476864"></abbr>		<abbr class="latitude" title="51.476864"></abbr>
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	Visible 4d coordinates		Visible 4d coordinates
	<pre><nowiki>		<pre><nowiki>
	<abbr class="4d" title="37.971508;23.72658;;1687">N ~~37Â°~~ 58' 17.43, E ~~23Â°~~ 43' 35.69</abbr>		<abbr class="4d" title="37.971508;23.72658;;1687">N 37° 58' 17.43, E 23° 43' 35.69</abbr>
	</nowiki></pre>		</nowiki></pre>

	may be rendered as:		may be rendered as:

	''<abbr class="4d" title="37.971508;23.72658;;1687">N ~~37Â°~~ 58' 17.43, E ~~23Â°~~ 43' 35.69</abbr>''		''<abbr class="4d" title="37.971508;23.72658;;1687">N 37° 58' 17.43, E 23° 43' 35.69</abbr>''

	====Example 4====		====Example 4====

LiorrEltrz: cnaletoorboc

2008-12-18T00:50:47Z

cnaletoorboc

← Older revision		Revision as of 00:50, 18 December 2008
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			cnaorpasd
	'''This page and effort is failing to follow the microformats [[process]]. If you are the author of this page, please join the [http://microformats.org/discuss #microformats IRC channel and/or microformats-discuss mailing list] so that the community can help walk you through the process.''' - Tantek		'''This page and effort is failing to follow the microformats [[process]]. If you are the author of this page, please join the [http://microformats.org/discuss #microformats IRC channel and/or microformats-discuss mailing list] so that the community can help walk you through the process.''' - Tantek

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	<blockquote>		<blockquote>
	Spacetimes are the arenas in which all physical events take place — for example, the motion of planets around the Sun may be described in a particular type of spacetime, or the motion of light around a rotating star may be described in another type of spacetime. The basic elements of spacetime are events. In any given spacetime, an event is a '''unique position''' at a '''unique time'''. Examples of events include the explosion of a star or the single beat of a drum. [http://en.wikipedia.org/wiki/Timespace Spacetime, Wikipedia] (annotation by the author)		Spacetimes are the arenas in which all physical events take place â for example, the motion of planets around the Sun may be described in a particular type of spacetime, or the motion of light around a rotating star may be described in another type of spacetime. The basic elements of spacetime are events. In any given spacetime, an event is a '''unique position''' at a '''unique time'''. Examples of events include the explosion of a star or the single beat of a drum. [http://en.wikipedia.org/wiki/Timespace Spacetime, Wikipedia] (annotation by the author)
	</blockquote>		</blockquote>

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	It should be noted that the assumption about the datum used in expressing the lat-long coordinates mentioned above, is not a trivial one: Only 20 years ago, the same coordinates would possibly point hundreds of meters away from the Parthenon, since the reference system used at that time was different than WGS84. Furthermore, assuming WGS84 was the datum for the markup above, these coordinates may not be accurate 10 years from today, when the WGS84 reference system will have been revised once again.		It should be noted that the assumption about the datum used in expressing the lat-long coordinates mentioned above, is not a trivial one: Only 20 years ago, the same coordinates would possibly point hundreds of meters away from the Parthenon, since the reference system used at that time was different than WGS84. Furthermore, assuming WGS84 was the datum for the markup above, these coordinates may not be accurate 10 years from today, when the WGS84 reference system will have been revised once again.

	A markable indication of the importance of the reference system, when expressing geo coordinates, is the fact that the Greenwich Observatory, which was by definition the origin for the longitude coordinate for more than a century, lies now about 102.5m West of the WGS84 0.0 meridian, at N ~~51°~~ 28' 36.71, W 0° 0' 5.18", (in WGS84 datum) according to [http://en.wikipedia.org/wiki/Prime_Meridian Wikipedia, Prime_Meridian]. Interestingly, Google maps and Wikipedia do not seem to agree on these coordinates [http://maps.google.com/maps?f=q&hl=en&q=51.476864,-0.000518&ie=UTF8&z=19&ll=51.476861,-0.000515&spn=0.001067,0.002175&t=h&om=1&iwloc=addr map]		A markable indication of the importance of the reference system, when expressing geo coordinates, is the fact that the Greenwich Observatory, which was by definition the origin for the longitude coordinate for more than a century, lies now about 102.5m West of the WGS84 0.0 meridian, at N 51Â° 28' 36.71, W 0Â° 0' 5.18", (in WGS84 datum) according to [http://en.wikipedia.org/wiki/Prime_Meridian Wikipedia, Prime_Meridian]. Interestingly, Google maps and Wikipedia do not seem to agree on these coordinates [http://maps.google.com/maps?f=q&hl=en&q=51.476864,-0.000518&ie=UTF8&z=19&ll=51.476861,-0.000515&spn=0.001067,0.002175&t=h&om=1&iwloc=addr map]
	<span class="geo">		<span class="geo">
	<abbr class="latitude" title="51.476864"></abbr>		<abbr class="latitude" title="51.476864"></abbr>
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	Visible 4d coordinates		Visible 4d coordinates
	<pre><nowiki>		<pre><nowiki>
	<abbr class="4d" title="37.971508;23.72658;;1687">N ~~37°~~ 58' 17.43, E ~~23°~~ 43' 35.69</abbr>		<abbr class="4d" title="37.971508;23.72658;;1687">N 37Â° 58' 17.43, E 23Â° 43' 35.69</abbr>
	</nowiki></pre>		</nowiki></pre>

	may be rendered as:		may be rendered as:

	''<abbr class="4d" title="37.971508;23.72658;;1687">N ~~37°~~ 58' 17.43, E ~~23°~~ 43' 35.69</abbr>''		''<abbr class="4d" title="37.971508;23.72658;;1687">N 37Â° 58' 17.43, E 23Â° 43' 35.69</abbr>''

	====Example 4====		====Example 4====

AndyMabbett: /* Introduction */ format

2008-02-11T10:30:36Z

Introduction: format

← Older revision		Revision as of 10:30, 11 February 2008
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	===Introduction===		===Introduction===

	<~~div style="width~~:~~400px;"~~>		<blockquote>
			Spacetimes are the arenas in which all physical events take place — for example, the motion of planets around the Sun may be described in a particular type of spacetime, or the motion of light around a rotating star may be described in another type of spacetime. The basic elements of spacetime are events. In any given spacetime, an event is a '''unique position''' at a '''unique time'''. Examples of events include the explosion of a star or the single beat of a drum. [http://en.wikipedia.org/wiki/Timespace Spacetime, Wikipedia] (annotation by the author)
			</blockquote>

	''Spacetimes are the arenas in which all physical events take place — for example, the motion of planets around the Sun may be described in a particular type of spacetime, or the motion of light around a rotating star may be described in another type of spacetime. The basic elements of spacetime are events. In any given spacetime, an event is a '''unique position''' at a '''unique time'''. Examples of events include the explosion of a star or the single beat of a drum.''[http://en.wikipedia.org/wiki/Timespace Spacetime, Wikipedia] (annotation by the author)		Location and geo referencing microformats proposed on this site, namely [[geo]], [[luna]] and [[mars]] have at present (Jan 2007) a status of draft. Dealing with the issue of geo tagging requires a consensus on the issues of importance, if the microformat is to be successful and used without problems. To that extend, a proposal for a new microformat might not be superfluous, if it can present and offer for discussion some of the issues at hand. With that ambition, the '''4d''' microformat is presented and discussed herein.
	~~</div>~~
	~~<div> </div>~~

	~~'''<span style="font-size:2em">L</span>'''OCATION~~ and geo referencing microformats proposed on this site, namely [[geo]], [[luna]] and [[mars]] have at present (Jan 2007) a status of draft. Dealing with the issue of geo tagging requires a consensus on the issues of importance, if the microformat is to be successful and used without problems. To that extend, a proposal for a new microformat might not be superfluous, if it can present and offer for discussion some of the issues at hand. With that ambition, the '''4d''' microformat is presented and discussed herein.

	===Brief discussion===		===Brief discussion===

DimitriosZachariadis at 21:54, 23 January 2007

2007-01-23T21:54:56Z

← Older revision		Revision as of 21:54, 23 January 2007
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	'''This page and effort is failing to follow the microformats [[process]]. If you are the author of this page, please join the [http://microformats.org/discuss #microformats IRC channel and/or microformats-discuss mailing list] so that the community can help walk you through the process.''' - Tantek		'''This page and effort is failing to follow the microformats [[process]]. If you are the author of this page, please join the [http://microformats.org/discuss #microformats IRC channel and/or microformats-discuss mailing list] so that the community can help walk you through the process.''' - Tantek

	<h5 style="color:red~~;font-weight:bold~~;">This page is now abandoned due to non conformance. Some of this material may appear on new pages following the proper process~~'''~~.</h5> ~~[[User:DimitriosZachariadis\|~~DimitriosZachariadis]]		<span style="color:red;">This page is now abandoned due to non conformance. Some of this material may appear on new pages following the proper process.</span> - DimitriosZachariadis

	==4d: A geo microformat alternative proposal==		==4d: A geo microformat alternative proposal==

DimitriosZachariadis at 21:52, 23 January 2007

2007-01-23T21:52:12Z

← Older revision		Revision as of 21:52, 23 January 2007
Line 1:		Line 1:
	'''This page and effort is failing to follow the microformats [[process]]. If you are the author of this page, please join the [http://microformats.org/discuss #microformats IRC channel and/or microformats-discuss mailing list] so that the community can help walk you through the process.''' - Tantek		'''This page and effort is failing to follow the microformats [[process]]. If you are the author of this page, please join the [http://microformats.org/discuss #microformats IRC channel and/or microformats-discuss mailing list] so that the community can help walk you through the process.''' - Tantek

			<h5 style="color:red;font-weight:bold;">This page is now abandoned due to non conformance. Some of this material may appear on new pages following the proper process'''.</h5> [[User:DimitriosZachariadis\|DimitriosZachariadis]]
	==4d: A geo microformat alternative proposal==		==4d: A geo microformat alternative proposal==

RyanKing: Reverted edit of DimitriosZachariadis, changed back to last version by Tantek

2007-01-23T18:16:05Z

Reverted edit of DimitriosZachariadis, changed back to last version by Tantek

Show changes

DimitriosZachariadis at 00:08, 23 January 2007

2007-01-23T00:08:20Z

Show changes

DimitriosZachariadis at 00:32, 19 January 2007

2007-01-19T00:32:42Z

← Older revision		Revision as of 00:32, 19 January 2007
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	''u'' is the reference system code, mandatory if not defined globally		''u'' is the reference system code, mandatory if not defined globally

	Dimensions ''z'', ''t'', and ''u'' can be omitted. If ambiguities arise from such an omition, e.g. omiting the ''z'' and ''t'' dimensions but defining the ''u'' dimension, then the relevant field values must be left empty, e.g.: ''v1;v2;;;u''		Dimensions ''z'', ''t'', and ''u'' can be omitted. If ambiguities arise from such an omition, e.g. omiting the ''z'' and ''t'' dimensions but defining the ''u'' dimension, then the relevant field values must be left empty, e.g.: ''v1;v2;;;u''.


	===Default Reference System===		===Default Reference System===
	The default reference system for the geo microformat is WGS84 and the Gregorian calendar~~. It is proposed that a geo reference system be explicitly provided with the data, either as a global setting at the begining of an (X)HTML page or with each geo coordinate tuple~~.		The default reference system for the geo microformat is WGS84 and the Gregorian calendar.

	The proposed time dimension is to be expressed in the ISO-8601 format ("YYYY-MM-DDThh:mm:ss.ssZ"), in any of its abbreviations and forms. [http://www.w3.org/TR/NOTE-datetime W3C, Date and Time Formats] and [http://en.wikipedia.org/wiki/ISO_8601 Wikipedia, ISO-8601]		The proposed time dimension is to be expressed in the ISO-8601 format ("YYYY-MM-DDThh:mm:ss.ssZ"), in any of its abbreviations and forms. [http://www.w3.org/TR/NOTE-datetime W3C, Date and Time Formats] and [http://en.wikipedia.org/wiki/ISO_8601 Wikipedia, ISO-8601]
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	When a dimension is omitted, the following default values are implied:		When a dimension is omitted, the following default values are implied:

	~~''u'': reference system, no default~~
	''v1'': latitude, expressed in decimal degrees, no default		''v1'': latitude, expressed in decimal degrees, no default
	''v2'': longitude, expressed in decimal degrees, no default		''v2'': longitude, expressed in decimal degrees, no default
	''z'': altitude, expressed in meters, ~~defaults to~~ '''0.0'''		''z'': altitude, expressed in meters, '''0.0'''
	''t'': time, no default		''t'': time, no default
			''u'': reference system, '''WGS84'''

	The default reference system for an (X)HTML page ~~MUST~~ be set by using meta data properties, if the geo data defines no reference system		The default reference system for an (X)HTML page should be set by using meta data properties, if the geo data tuple defines no reference system.

	<span style="color:#080;font-weight:bold;">It is strongly recommended that web pages include a meta data element that defines the default reference system, in their HTML head section</span>. The inclusion of the meta data element ensures the validity of the 4d data for as long as the page exists, while keeping geo values compact. By adding the '''geo.reference''' metadata property, a transition to the amended geo microformat would require no further change to the markup.		<span style="color:#080;font-weight:bold;">It is strongly recommended that web pages include a meta data element that defines the default reference system, in their HTML head section</span>. The inclusion of the meta data element ensures the validity of the 4d data for as long as the page exists, while keeping geo values compact. By adding the '''geo.reference''' metadata property, a transition to the amended geo microformat would require no further change to the markup.

DimitriosZachariadis: /* Default Reference System */

2007-01-19T00:15:18Z

Default Reference System

← Older revision		Revision as of 00:15, 19 January 2007
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	===Default Reference System===		===Default Reference System===
	The default reference system is WGS84 and the Gregorian calendar.		The default reference system for the geo microformat is WGS84 and the Gregorian calendar. It is proposed that a geo reference system be explicitly provided with the data, either as a global setting at the begining of an (X)HTML page or with each geo coordinate tuple.

	The time dimension is expressed in the ISO-8601 format ("YYYY-MM-DDThh:mm:ss.ssZ"), in any of its abbreviations and forms. [http://www.w3.org/TR/NOTE-datetime W3C, Date and Time Formats] and [http://en.wikipedia.org/wiki/ISO_8601 Wikipedia, ISO-8601]		The proposed time dimension is to be expressed in the ISO-8601 format ("YYYY-MM-DDThh:mm:ss.ssZ"), in any of its abbreviations and forms. [http://www.w3.org/TR/NOTE-datetime W3C, Date and Time Formats] and [http://en.wikipedia.org/wiki/ISO_8601 Wikipedia, ISO-8601]

	An interesting provision of the ISO-8601 time format is that it allows time durations to be defined in a consistant manner.		An interesting provision of the ISO-8601 time format is that it allows time durations to be defined in a consistant manner.

	===Meta data===		===Meta data===

DimitriosZachariadis at 21:17, 18 January 2007

2007-01-18T21:17:53Z

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