Datum - Revision history

Designing Buildings at 09:28, 11 October 2022

2022-10-11T09:28:26Z

← Older revision		Revision as of 09:28, 11 October 2022
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	[https://historicengland.org.uk/images-books/publications/drawing-for-understanding/heag119-drawing-for-understanding/ Drawing for Understanding, Creating Interpretive Drawings of Historic Buildings], published by Historic England in 2016 defines a datum line as: 'A horizontal or vertical reference line used to control height and horizontal distance measurements.'		[https://historicengland.org.uk/images-books/publications/drawing-for-understanding/heag119-drawing-for-understanding/ Drawing for Understanding, Creating Interpretive Drawings of Historic Buildings], published by Historic England in 2016 defines a datum line as: 'A horizontal or vertical reference line used to control height and horizontal distance measurements.'
		+
		+	The [https://www.gov.uk/government/publications/geospatial-glossary/geospatial-glossary Geospatial Glossary], published by the Geospatial Commission, and accessed on 17 September 2022, defines horizontal datums as: ‘…a series of data points on the surface of the earth that are used to measure the position of oneself on the Earth’s surface.’

	= Related articles on Designing Buildings =		= Related articles on Designing Buildings =

Designing Buildings at 09:27, 4 November 2021

2021-11-04T09:27:34Z

← Older revision		Revision as of 09:27, 4 November 2021
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	* At grade.		* At grade.
		+	* [[Data_in_the_construction_industry\|Data]].
	* Ordnance Survey.		* Ordnance Survey.
	* Origin point.		* Origin point.

Designing Buildings at 07:51, 15 October 2021

2021-10-15T07:51:33Z

← Older revision		Revision as of 07:51, 15 October 2021
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	[https://historicengland.org.uk/images-books/publications/drawing-for-understanding/heag119-drawing-for-understanding/ Drawing for Understanding, Creating Interpretive Drawings of Historic Buildings], published by Historic England in 2016 defines a datum line as: 'A horizontal or vertical reference line used to control height and horizontal distance measurements.'		[https://historicengland.org.uk/images-books/publications/drawing-for-understanding/heag119-drawing-for-understanding/ Drawing for Understanding, Creating Interpretive Drawings of Historic Buildings], published by Historic England in 2016 defines a datum line as: 'A horizontal or vertical reference line used to control height and horizontal distance measurements.'

−	= Related articles on Designing Buildings ~~Wiki~~ =	+	= Related articles on Designing Buildings =

	* At grade.		* At grade.

Designing Buildings at 07:51, 15 October 2021

2021-10-15T07:51:18Z

← Older revision		Revision as of 07:51, 15 October 2021
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		+	[[Data_in_the_construction_industry\|For DATA click here]].
		+
		+	-----
	On a construction project, a datum level is an arbitrary horizontal plane of reference from which all vertical dimensions are measured. It can show the vertical height difference between floor levels of a building as well as differences in levels between one part of the site and another.		On a construction project, a datum level is an arbitrary horizontal plane of reference from which all vertical dimensions are measured. It can show the vertical height difference between floor levels of a building as well as differences in levels between one part of the site and another.

86.170.96.191 at 09:28, 14 December 2020

2020-12-14T09:28:07Z

← Older revision		Revision as of 09:28, 14 December 2020
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	On a construction project, a datum level is an arbitrary horizontal plane of reference from which all vertical dimensions are measured. It can show the vertical height difference between floor levels of a building as well as differences in levels between one part of the site and another.		On a construction project, a datum level is an arbitrary horizontal plane of reference from which all vertical dimensions are measured. It can show the vertical height difference between floor levels of a building as well as differences in levels between one part of the site and another.

−	The datum on a site can be given a 0.000m designation but this does not have to necessarily be outside ground level; if it is, a ground floor may be at say, 0.750m and a first floor at 4.750 and so on proceeding up the ~~buidrlding~~. In contrast, a basement which will be below ground will be below datum level and will therefore have a minus symbol prefixed to it e.g -3.250m.	+	The datum on a site can be given a 0.000m designation but this does not have to necessarily be outside ground level; if it is, a ground floor may be at say, 0.750m and a first floor at 4.750 and so on proceeding up the building. In contrast, a basement which will be below ground will be below datum level and will therefore have a minus symbol prefixed to it e.g -3.250m.

	However, minus signs can be easily misread, not seen or read as a dash, so can cause confusion. For this reason, a suitable fixed point (called a temporary benchmark – TBM) is assumed to ensure that all other levels are positive. So, in the case of the basement level referred to above, it may be given 0.000m as the site datum, in which case (following the logic from above) ground level = 3.250m; ground floor = 4.000m; first floor = 8.000m and so on. The levels usually refer to finished floor levels (FFL) but can also indicate other features e.g finished structural level (FSL)		However, minus signs can be easily misread, not seen or read as a dash, so can cause confusion. For this reason, a suitable fixed point (called a temporary benchmark – TBM) is assumed to ensure that all other levels are positive. So, in the case of the basement level referred to above, it may be given 0.000m as the site datum, in which case (following the logic from above) ground level = 3.250m; ground floor = 4.000m; first floor = 8.000m and so on. The levels usually refer to finished floor levels (FFL) but can also indicate other features e.g finished structural level (FSL)

86.170.96.191 at 09:27, 14 December 2020

2020-12-14T09:27:17Z

← Older revision		Revision as of 09:27, 14 December 2020
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	On a construction project, a datum level is an arbitrary horizontal plane of reference from which all vertical dimensions are measured. It can show the vertical height difference between floor levels of a building as well as differences in levels between one part of the site and another.		On a construction project, a datum level is an arbitrary horizontal plane of reference from which all vertical dimensions are measured. It can show the vertical height difference between floor levels of a building as well as differences in levels between one part of the site and another.

−	The datum on a site can be given a 0.000m designation but this does not have to necessarily be outside ground level; if it is, a ground floor may be at say, 0.750m and a first floor at 4.750 and so on proceeding up the ~~building~~. In contrast, a basement which will be below ground will be below datum level and will therefore have a minus symbol prefixed to it e.g -3.250m.	+	The datum on a site can be given a 0.000m designation but this does not have to necessarily be outside ground level; if it is, a ground floor may be at say, 0.750m and a first floor at 4.750 and so on proceeding up the buidrlding. In contrast, a basement which will be below ground will be below datum level and will therefore have a minus symbol prefixed to it e.g -3.250m.

	However, minus signs can be easily misread, not seen or read as a dash, so can cause confusion. For this reason, a suitable fixed point (called a temporary benchmark – TBM) is assumed to ensure that all other levels are positive. So, in the case of the basement level referred to above, it may be given 0.000m as the site datum, in which case (following the logic from above) ground level = 3.250m; ground floor = 4.000m; first floor = 8.000m and so on. The levels usually refer to finished floor levels (FFL) but can also indicate other features e.g finished structural level (FSL)		However, minus signs can be easily misread, not seen or read as a dash, so can cause confusion. For this reason, a suitable fixed point (called a temporary benchmark – TBM) is assumed to ensure that all other levels are positive. So, in the case of the basement level referred to above, it may be given 0.000m as the site datum, in which case (following the logic from above) ground level = 3.250m; ground floor = 4.000m; first floor = 8.000m and so on. The levels usually refer to finished floor levels (FFL) but can also indicate other features e.g finished structural level (FSL)

Designing Buildings: Reverted edits by 175.176.31.19 (talk) to last revision by Designing Buildings

2020-12-02T07:26:43Z

Reverted edits by 175.176.31.19 (talk) to last revision by Designing Buildings

← Older revision		Revision as of 07:26, 2 December 2020
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	* Water engineering.		* Water engineering.

−	~~[[Category:Articles_needing_more_work]]~~ [[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Theory]] [[Category:Construction_techniques]] [[Category:Design]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Theory]] [[Category:Construction_techniques]] [[Category:Design]]

175.176.31.19 at 00:43, 2 December 2020

2020-12-02T00:43:22Z

← Older revision		Revision as of 00:43, 2 December 2020
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	* Water engineering.		* Water engineering.

−	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Theory]] [[Category:Construction_techniques]] [[Category:Design]]	+	[[Category:Articles_needing_more_work]] [[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Theory]] [[Category:Construction_techniques]] [[Category:Design]]

Designing Buildings at 08:36, 8 October 2020

2020-10-08T08:36:42Z

← Older revision		Revision as of 08:36, 8 October 2020
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	* Water engineering.		* Water engineering.

−	[[Category:Theory]] [[Category:Construction_techniques]] [[Category:Design]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Theory]] [[Category:Construction_techniques]] [[Category:Design]]

Designing Buildings at 08:44, 20 August 2020

2020-08-20T08:44:58Z

← Older revision		Revision as of 08:44, 20 August 2020
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	A datum may also be a point that is used for setting out the building. This must be clearly marked on drawings to help the contractor’s setting out. For example, a circular building will be set out from a datum point from which all radii are generated.		A datum may also be a point that is used for setting out the building. This must be clearly marked on drawings to help the contractor’s setting out. For example, a circular building will be set out from a datum point from which all radii are generated.
		+
		+	[https://historicengland.org.uk/images-books/publications/drawing-for-understanding/heag119-drawing-for-understanding/ Drawing for Understanding, Creating Interpretive Drawings of Historic Buildings], published by Historic England in 2016 defines a datum line as: 'A horizontal or vertical reference line used to control height and horizontal distance measurements.'

	= Related articles on Designing Buildings Wiki =		= Related articles on Designing Buildings Wiki =