OR/19/024 Technical information - Revision history

Dbk at 10:27, 8 January 2020

2020-01-08T10:27:24Z

← Older revision		Revision as of 11:27, 8 January 2020
Line 21:		Line 21:

	{\| class="wikitable"		{\| class="wikitable"
	\|+ Table 2 Attribute table field descriptions for Buried Valleys (onshore) Modelled Thickness of Buried Valleys theme		\|+ Table 2 Attribute table field descriptions for Buried Valleys (onshore) Modelled Thickness of Buried Valleys theme.
	! Field name !! Field Type !! Description		! Field name !! Field Type !! Description
	\|-		\|-

Dbk at 10:26, 8 January 2020

2020-01-08T10:26:34Z

@@ Line 19: / Line 19: @@
 | VERSION|| Text|| Version number and attribute level of the digital data: e.g. v1.0
 |}
 ==Explanation of the data==

Dbk at 10:23, 8 January 2020

2020-01-08T10:23:13Z

← Older revision		Revision as of 11:23, 8 January 2020
Line 6:		Line 6:
	Each buried valley theme (GIS map layer) contains a series of attribute fields specific to the data they contain. For example, the historic buried valleys include a reference field identifying the data source. Table 1 describes the Buried Valleys (onshore) Historic data (centrelines and margins); whilst Table 2 lists the contents of the Modelled Thickness of Buried Valleys theme.		Each buried valley theme (GIS map layer) contains a series of attribute fields specific to the data they contain. For example, the historic buried valleys include a reference field identifying the data source. Table 1 describes the Buried Valleys (onshore) Historic data (centrelines and margins); whilst Table 2 lists the contents of the Modelled Thickness of Buried Valleys theme.

			<center>
	{\| class="wikitable"		{\| class="wikitable"
	\|+ Table 1 Attribute table field descriptions for Buried Valleys (onshore) Historic centrelines and Buried Valley Historic margins.		\|+ Table 1 Attribute table field descriptions for Buried Valleys (onshore) Historic centrelines and Buried Valley Historic margins.
Line 18:		Line 19:
	\| VERSION\|\| Text\|\| Version number and attribute level of the digital data: e.g. v1.0		\| VERSION\|\| Text\|\| Version number and attribute level of the digital data: e.g. v1.0
	\|}		\|}
			</center>

Dbk at 10:22, 8 January 2020

2020-01-08T10:22:16Z

← Older revision		Revision as of 11:22, 8 January 2020
Line 7:		Line 7:

	{\| class="wikitable"		{\| class="wikitable"
	\|- Table 1 Attribute table field descriptions for Buried Valleys (onshore) Historic centrelines and Buried Valley Historic margins.		\|+ Table 1 Attribute table field descriptions for Buried Valleys (onshore) Historic centrelines and Buried Valley Historic margins.
	! Field name !! Field Type !! Description		! Field name !! Field Type !! Description
	\|-		\|-

Dbk at 10:21, 8 January 2020

2020-01-08T10:21:41Z

← Older revision		Revision as of 11:21, 8 January 2020
Line 2:		Line 2:
	==Scale==		==Scale==
	The buried valley suite of data was produced for use at 1:250 000 scale providing 250 m ground resolution.		The buried valley suite of data was produced for use at 1:250 000 scale providing 250 m ground resolution.

	==Field descriptions==		==Field descriptions==
	Each buried valley theme (GIS map layer) contains a series of attribute fields specific to the data they contain. For example, the historic buried valleys include a reference field identifying the data source. Table 1 describes the Buried Valleys (onshore) Historic data (centrelines and margins); whilst Table 2 lists the contents of the Modelled Thickness of Buried Valleys theme.		Each buried valley theme (GIS map layer) contains a series of attribute fields specific to the data they contain. For example, the historic buried valleys include a reference field identifying the data source. Table 1 describes the Buried Valleys (onshore) Historic data (centrelines and margins); whilst Table 2 lists the contents of the Modelled Thickness of Buried Valleys theme.

			{\| class="wikitable"
			\|- Table 1 Attribute table field descriptions for Buried Valleys (onshore) Historic centrelines and Buried Valley Historic margins.
			! Field name !! Field Type !! Description
			\|-
			\| REFERENCE \|\| Text\|\| The reference from which the data was drawn from
			\|-
			\| FEATURE\|\| Text\|\| The name of the dataset: e.g. Buried Valley Historic centrelines
			\|-
			\| SCALE\|\| Text\|\| The scale used to prepare the digital data: e.g. 250000 for 1:250 000
			\|-
			\| VERSION\|\| Text\|\| Version number and attribute level of the digital data: e.g. v1.0
			\|}


	~~Table 1 Attribute table field descriptions for Buried Valleys (onshore) Historic centrelines and Buried Valley Historic margins.~~

	~~FIELD NAME FIELD TYPE DESCRIPTION~~		VERSION Text
	~~REFERENCE Text The reference from which the data was drawn from~~
	~~FEATURE Text The name of the dataset: e.g. Buried Valley Historic centrelines~~
	~~SCALE Text The scale used to prepare the digital data: e.g. 250000 for 1:250 000~~
	VERSION Text ~~Version number and attribute level of the digital data: e.g. v1.0~~

	Table 2 Attribute table field descriptions for Buried Valleys (onshore) Modelled Thickness of Buried Valleys theme		Table 2 Attribute table field descriptions for Buried Valleys (onshore) Modelled Thickness of Buried Valleys theme
Line 32:		Line 39:
	For full details see Kearsey et al. 2019<ref name="Kearsey">KEARSEY, T, LEE, J R., GOW, H. 2019. Buried Valleys (onshore) Version 1. British Geological Survey Open Report, OR/19/003. 29pp</ref>. Buried Valleys (onshore) Version 1 - (OR/19/003)		For full details see Kearsey et al. 2019<ref name="Kearsey">KEARSEY, T, LEE, J R., GOW, H. 2019. Buried Valleys (onshore) Version 1. British Geological Survey Open Report, OR/19/003. 29pp</ref>. Buried Valleys (onshore) Version 1 - (OR/19/003)

			[[Image:OR19024fig2.jpg\|thumb\|center\|400px\| '''Figure 2''' Multiple interpretations of the position of a set of buried valley margins. The colours pick out different interpreations of the locations of the positions of the features. Contains NEXTMap™ Britain elevation data from Intermap Technologies. Created using ArcGIS. Copyright © Esri. All rights reserved.]]

	Figure 2. Multiple interpretations of the position of a set of buried valley margins. The colours pick out different interpreations of the locations of the positions of the features. Contains NEXTMap™ Britain elevation data from Intermap Technologies. Created using ArcGIS. Copyright © Esri. All rights reserved.


	===Modelled Thickness of Buried Valleys===		===Modelled Thickness of Buried Valleys===
Line 53:		Line 57:
	Data covers the known locations of buried valleys across Great Britain		Data covers the known locations of buried valleys across Great Britain

			[[Image:OR19024fig3.jpg\|thumb\|center\|400px\| '''Figure 3''' The coverage of the Buried Valley data. Contains Ordnance Data © Crown Copyright and database rights 2019. Ordnance Survey Licence no. 100021290. Created using ArcGIS. Copyright ©Esri. All rights reserved.]]

	Figure 3. The coverage of the Buried Valley data. Contains Ordnance Data © Crown Copyright and database rights 2019. Ordnance Survey Licence no. 100021290. Created using ArcGIS. Copyright ©Esri. All rights reserved.

	==Data foramt==		==Data foramt==

Dbk at 10:16, 8 January 2020

2020-01-08T10:16:02Z

← Older revision		Revision as of 11:16, 8 January 2020
Line 1:		Line 1:
	__notoc__		__notoc__
	~~3.1 SCALE~~		==Scale==
	The buried valley suite of data was produced for use at 1:250 000 scale providing 250 m ground resolution.		The buried valley suite of data was produced for use at 1:250 000 scale providing 250 m ground resolution.

	~~3.2 FIELD DESCRIPTIONS~~		==Field descriptions==
	Each buried valley theme (GIS map layer) contains a series of attribute fields specific to the data they contain. For example, the historic buried valleys include a reference field identifying the data source. Table 1 describes the Buried Valleys (onshore) Historic data (centrelines and margins); whilst Table 2 lists the contents of the Modelled Thickness of Buried Valleys theme.		Each buried valley theme (GIS map layer) contains a series of attribute fields specific to the data they contain. For example, the historic buried valleys include a reference field identifying the data source. Table 1 describes the Buried Valleys (onshore) Historic data (centrelines and margins); whilst Table 2 lists the contents of the Modelled Thickness of Buried Valleys theme.

Line 13:		Line 13:
	REFERENCE Text The reference from which the data was drawn from		REFERENCE Text The reference from which the data was drawn from
	FEATURE Text The name of the dataset: e.g. Buried Valley Historic centrelines		FEATURE Text The name of the dataset: e.g. Buried Valley Historic centrelines
	SCALE Text The scale used to prepare the digital data: e.g. 250000 for 1:250 000		SCALE Text The scale used to prepare the digital data: e.g. 250000 for 1:250 000
	VERSION Text Version number and attribute level of the digital data: e.g. v1.0		VERSION Text Version number and attribute level of the digital data: e.g. v1.0

Line 21:		Line 21:
	FEATURE Text The name of the dataset: e.g. Buried Valley Historic centrelines		FEATURE Text The name of the dataset: e.g. Buried Valley Historic centrelines
	THICKNESS Text Thickness of superficial deposits based on a computer interpolation		THICKNESS Text Thickness of superficial deposits based on a computer interpolation
	SCALE Text The scale used to prepare the digital data: e.g. 625000 for 1:625 000		SCALE Text The scale used to prepare the digital data: e.g. 625000 for 1:625 000
	VERSION Text Version number and attribute level of the digital data: e.g. v1.0		VERSION Text Version number and attribute level of the digital data: e.g. v1.0


	~~3.3 EXPLANATION OF THE DATA~~		==Explanation of the data==
			===Historic references to Buried Valleys===
	~~3.3.1~~ Historic references to Buried Valleys
	The Buried Valley Historic centrelines and Buried Valley Historic margins GIS layers contain the references from which the data they contain was mined.		The Buried Valley Historic centrelines and Buried Valley Historic margins GIS layers contain the references from which the data they contain was mined.
	In some instances, different references interpret the same features differently. In cases of multiple interpretations no judgement has been made and all interpretations are included. This enables the user to visualise the diversity of interpretations (Figure 2) and obtain a rudimentary understanding of uncertainty of their location.		In some instances, different references interpret the same features differently. In cases of multiple interpretations no judgement has been made and all interpretations are included. This enables the user to visualise the diversity of interpretations (Figure 2) and obtain a rudimentary understanding of uncertainty of their location.
	For full details see Kearsey et al. 2019. Buried Valleys (onshore) Version 1 - (OR/19/003)
			For full details see Kearsey et al. 2019<ref name="Kearsey">KEARSEY, T, LEE, J R., GOW, H. 2019. Buried Valleys (onshore) Version 1. British Geological Survey Open Report, OR/19/003. 29pp</ref>. Buried Valleys (onshore) Version 1 - (OR/19/003)


Line 38:		Line 37:


	~~3.3.2~~ Modelled Thickness of Buried Valleys		===Modelled Thickness of Buried Valleys===
	Modelled Thickness of Buried Valleys is captured from open access borehole records contains the contoured thickness of superficial deposits. These features are grouped in the 5 different categories based on a computer interpolation. The categories are as follows:		Modelled Thickness of Buried Valleys is captured from open access borehole records contains the contoured thickness of superficial deposits. These features are grouped in the 5 different categories based on a computer interpolation. The categories are as follows:
	~~• 10m~~ – 20 m		* =10 m
	~~• 20m – 30~~ m		* – 20 m
	~~• 30m – 40~~ m		* =20m–30 m
	• Greater than 40 m		* =30m–40 m
	~~The ‘Greater than 40 m’ category includes features to a maximum thickness of 161 m of superficial deposits.~~		* =Greater than 40 m
	Buried Valleys are defined as features centred on five or more boreholes containing 20 m or more of superficial deposits. Locations which failed to meet either one of these criteria were removed from the data.
	~~For full details see Kearsey et al. 2019. Buried Valleys (onshore) Version 1 (OR/19/003)~~


			The ‘Greater than 40 m’ category includes features to a maximum thickness of 161 m of superficial deposits.
			Buried Valleys are defined as features centred on five or more boreholes containing 20 m or more of superficial deposits. Locations which failed to meet either one of these criteria were removed from the data.

	3.~~4 COVERAGE~~		For full details see Kearsey et al. 2019<ref name="Kearsey"></ref>. Buried Valleys (onshore) Version 1 (OR/19/003)

			==Coverage==
	Data covers the known locations of buried valleys across Great Britain		Data covers the known locations of buried valleys across Great Britain



	Figure 3. The coverage of the Buried Valley data. Contains Ordnance Data © Crown Copyright and database rights 2019. Ordnance Survey Licence no. 100021290. Created using ArcGIS. Copyright ~~© Esri~~. All rights reserved.		Figure 3. The coverage of the Buried Valley data. Contains Ordnance Data © Crown Copyright and database rights 2019. Ordnance Survey Licence no. 100021290. Created using ArcGIS. Copyright ©Esri. All rights reserved.

	~~3.5 DATA FORMAT~~		==Data foramt==
	The Buried Valley suite of data has been created as vector polygons. The data are available in a range of GIS formats, including ArcGIS (.shp), ArcInfo Coverages and MapInfo (.tab). More specialised formats may be available but may incur additional processing costs.		The Buried Valley suite of data has been created as vector polygons. The data are available in a range of GIS formats, including ArcGIS (.shp), ArcInfo Coverages and MapInfo (.tab). More specialised formats may be available but may incur additional processing costs.

	~~3.6 LIMITATIONS~~		==Limitations==
	• The Buried Valleys (onshore) suite of data has been developed at 1:250 000 scale and must not be used at larger scales. All spatial searches against the data should therefore be conducted using a minimum 250 m buffer.		* The Buried Valleys (onshore) suite of data has been developed at 1:250 000 scale and must not be used at larger scales. All spatial searches against the data should therefore be conducted using a minimum 250 m buffer.
	• Buried Valley (onshore) data described here represents a baseline of BGS’ current understanding of the locations of buried valleys onshore in Great Britain. This information is based on our currently held historical literature and borehole data. It is inevitable that some of the information may in the light of further evidence be deemed incorrect, and require revision or rejection. This data will form the basis of future research into these features and as a consequence will be periodically updated to include new information as it becomes available.		* Buried Valley (onshore) data described here represents a baseline of BGS’ current understanding of the locations of buried valleys onshore in Great Britain. This information is based on our currently held historical literature and borehole data. It is inevitable that some of the information may in the light of further evidence be deemed incorrect, and require revision or rejection. This data will form the basis of future research into these features and as a consequence will be periodically updated to include new information as it becomes available.
	• Buried Valleys (onshore) data should only be used as an indicator where evidence has pointed to the presence of a buried valley. However, the absence of evidence does not substantiate the absence of buried valley features.		* Buried Valleys (onshore) data should only be used as an indicator where evidence has pointed to the presence of a buried valley. However, the absence of evidence does not substantiate the absence of buried valley features.
	• Buried Valleys (onshore) data contains multiple interpretations as no judgement has been made and all interpretations are included. This enables the user to visualise the diversity of interpretations and obtain a rudimentary understanding of uncertainty of their location.		* Buried Valleys (onshore) data contains multiple interpretations as no judgement has been made and all interpretations are included. This enables the user to visualise the diversity of interpretations and obtain a rudimentary understanding of uncertainty of their location.
	• The Historic Buried Valley data covers only known areas where research has been carried out and published. In other words it is an empirical dataset and this aspect of the dataset will evolve as additional material is identified or published.		* The Historic Buried Valley data covers only known areas where research has been carried out and published. In other words it is an empirical dataset and this aspect of the dataset will evolve as additional material is identified or published.
	• Coverage of the modelled thickness of buried valleys is limited to areas where the source data is available for processing.		* Coverage of the modelled thickness of buried valleys is limited to areas where the source data is available for processing.
	• For a full discussion of the assumptions and limitation of the Buried Valley data see Kearsey et al. 2019. Buried Valleys (onshore) Version 1 (OR/19/003).		* For a full discussion of the assumptions and limitation of the Buried Valley data see Kearsey et al. 2019<ref name="Kearsey"></ref>. Buried Valleys (onshore) Version 1 (OR/19/003).

	==References==		==References==

Dbk: Created page with "notoc 3.1 SCALE The buried valley suite of data was produced for use at 1:250 000 scale providing 250 m ground resolution. 3.2 FIELD DESCRIPTIONS Each buried valley them..."

2020-01-08T10:08:51Z

Created page with "__notoc__ 3.1 SCALE The buried valley suite of data was produced for use at 1:250 000 scale providing 250 m ground resolution. 3.2 FIELD DESCRIPTIONS Each buried valley them..."

New page

__notoc__
3.1 SCALE
The buried valley suite of data was produced for use at 1:250 000 scale providing 250 m ground resolution.

3.2 FIELD DESCRIPTIONS
Each buried valley theme (GIS map layer) contains a series of attribute fields specific to the data they contain. For example, the historic buried valleys include a reference field identifying the data source. Table 1 describes the Buried Valleys (onshore) Historic data (centrelines and margins); whilst Table 2 lists the contents of the Modelled Thickness of Buried Valleys theme.

Table 1 Attribute table field descriptions for Buried Valleys (onshore) Historic centrelines and Buried Valley Historic margins.

FIELD NAME FIELD TYPE DESCRIPTION
REFERENCE Text The reference from which the data was drawn from
FEATURE Text The name of the dataset: e.g. Buried Valley Historic centrelines
SCALE Text The scale used to prepare the digital data: e.g. 250000 for 1:250 000
VERSION Text Version number and attribute level of the digital data: e.g. v1.0

Table 2 Attribute table field descriptions for Buried Valleys (onshore) Modelled Thickness of Buried Valleys theme

FIELD NAME FIELD TYPE DESCRIPTION
FEATURE Text The name of the dataset: e.g. Buried Valley Historic centrelines
THICKNESS Text Thickness of superficial deposits based on a computer interpolation
SCALE Text The scale used to prepare the digital data: e.g. 625000 for 1:625 000
VERSION Text Version number and attribute level of the digital data: e.g. v1.0

3.3 EXPLANATION OF THE DATA

3.3.1 Historic references to Buried Valleys
The Buried Valley Historic centrelines and Buried Valley Historic margins GIS layers contain the references from which the data they contain was mined.
In some instances, different references interpret the same features differently. In cases of multiple interpretations no judgement has been made and all interpretations are included. This enables the user to visualise the diversity of interpretations (Figure 2) and obtain a rudimentary understanding of uncertainty of their location.
For full details see Kearsey et al. 2019. Buried Valleys (onshore) Version 1 - (OR/19/003)

Figure 2. Multiple interpretations of the position of a set of buried valley margins. The colours pick out different interpreations of the locations of the positions of the features. Contains NEXTMap™ Britain elevation data from Intermap Technologies. Created using ArcGIS. Copyright © Esri. All rights reserved.

3.3.2 Modelled Thickness of Buried Valleys
Modelled Thickness of Buried Valleys is captured from open access borehole records contains the contoured thickness of superficial deposits. These features are grouped in the 5 different categories based on a computer interpolation. The categories are as follows:
• 10m – 20 m
• 20m – 30 m
• 30m – 40 m
• Greater than 40 m
The ‘Greater than 40 m’ category includes features to a maximum thickness of 161 m of superficial deposits.
Buried Valleys are defined as features centred on five or more boreholes containing 20 m or more of superficial deposits. Locations which failed to meet either one of these criteria were removed from the data.
For full details see Kearsey et al. 2019. Buried Valleys (onshore) Version 1 (OR/19/003)

3.4 COVERAGE
Data covers the known locations of buried valleys across Great Britain

Figure 3. The coverage of the Buried Valley data. Contains Ordnance Data © Crown Copyright and database rights 2019. Ordnance Survey Licence no. 100021290. Created using ArcGIS. Copyright © Esri. All rights reserved.

3.5 DATA FORMAT
The Buried Valley suite of data has been created as vector polygons. The data are available in a range of GIS formats, including ArcGIS (.shp), ArcInfo Coverages and MapInfo (.tab). More specialised formats may be available but may incur additional processing costs.

3.6 LIMITATIONS
• The Buried Valleys (onshore) suite of data has been developed at 1:250 000 scale and must not be used at larger scales. All spatial searches against the data should therefore be conducted using a minimum 250 m buffer.
• Buried Valley (onshore) data described here represents a baseline of BGS’ current understanding of the locations of buried valleys onshore in Great Britain. This information is based on our currently held historical literature and borehole data. It is inevitable that some of the information may in the light of further evidence be deemed incorrect, and require revision or rejection. This data will form the basis of future research into these features and as a consequence will be periodically updated to include new information as it becomes available.
• Buried Valleys (onshore) data should only be used as an indicator where evidence has pointed to the presence of a buried valley. However, the absence of evidence does not substantiate the absence of buried valley features.
• Buried Valleys (onshore) data contains multiple interpretations as no judgement has been made and all interpretations are included. This enables the user to visualise the diversity of interpretations and obtain a rudimentary understanding of uncertainty of their location.
• The Historic Buried Valley data covers only known areas where research has been carried out and published. In other words it is an empirical dataset and this aspect of the dataset will evolve as additional material is identified or published.
• Coverage of the modelled thickness of buried valleys is limited to areas where the source data is available for processing.
• For a full discussion of the assumptions and limitation of the Buried Valley data see Kearsey et al. 2019. Buried Valleys (onshore) Version 1 (OR/19/003).

==References==
{{reflist}}

[[Category:OR/19/024 User guide for the British Geological Survey buried valleys (onshore) version 1 | 05]]