OR/14/013 Model assumptions geological rules used - Revision history

Dbk at 08:26, 6 August 2015

2015-08-06T08:26:04Z

← Older revision		Revision as of 09:26, 6 August 2015
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	[[Image:14013 fig1.jpg\|thumb\|400px\| Modelled blocks.]]		[[Image:14013 fig1.jpg\|thumb\|400px\| Modelled blocks.]]
	===Water modelling===		===Water modelling===
	A consistent approach to the modelling of water was attempted across all the modelled blocks ~~shown in the figure right~~. Firstly, a water envelope (extent) was extracted from the OS 1:10 000 scale Open data digital map. Judgement was then used to extract a subset of the larger water bodies from that map data such that the River Clyde, the lower parts of the White Cart and Black Cart waters and lakes/reservoirs exceeding approximately 150 m in width/length are included in the 3D model.		A consistent approach to the modelling of water was attempted across all the modelled blocks. Firstly, a water envelope (extent) was extracted from the OS 1:10 000 scale Open data digital map. Judgement was then used to extract a subset of the larger water bodies from that map data such that the River Clyde, the lower parts of the White Cart and Black Cart waters and lakes/reservoirs exceeding approximately 150 m in width/length are included in the 3D model.

	During modelling, the water bodies were generally fitted to the water envelope and not to the DTM as it is assumed that users will wish to attach the model to an OS map base rather than a derived/simplified NextMap DTM. The result is that in a few places where the DTM and OS map data do not match, water appears as if it goes uphill. In places (e.g. Balgray reservoir) other artefacts exist within the modelled water (e.g. where there is a bridge over the reservoir the DTM/water volume is raised up as the bridge is not modelled as such). In some areas there is made ground beneath water at dams, or along tidal parts of the River Clyde. The OS Open data envelope (extent) for water which extended to high water mark ''was ''edited within the intertidal zone in the Clydebank and western Central Glasgow models such that it fitted the NEXTmap® DTM in which ocean surface is levelled to OSGB1936 geodetic datum (i.e. zero metres relative to OD, or low water mark).		During modelling, the water bodies were generally fitted to the water envelope and not to the DTM as it is assumed that users will wish to attach the model to an OS map base rather than a derived/simplified NextMap DTM. The result is that in a few places where the DTM and OS map data do not match, water appears as if it goes uphill. In places (e.g. Balgray reservoir) other artefacts exist within the modelled water (e.g. where there is a bridge over the reservoir the DTM/water volume is raised up as the bridge is not modelled as such). In some areas there is made ground beneath water at dams, or along tidal parts of the River Clyde. The OS Open data envelope (extent) for water which extended to high water mark ''was ''edited within the intertidal zone in the Clydebank and western Central Glasgow models such that it fitted the NEXTmap® DTM in which ocean surface is levelled to OSGB1936 geodetic datum (i.e. zero metres relative to OD, or low water mark).

Dbk at 08:25, 6 August 2015

2015-08-06T08:25:41Z

← Older revision		Revision as of 09:25, 6 August 2015
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	Where no boreholes were present, basal units were modelled to the BGS rockhead model (see [http://www.bgs.ac.uk/products/onshore/superficialThickness.html) http://www.bgs.ac.uk/products/onshore/superficialThickness.html).] Where the depth of rockhead in boreholes differed from the rockhead model, the borehole depth was preferred.		Where no boreholes were present, basal units were modelled to the BGS rockhead model (see [http://www.bgs.ac.uk/products/onshore/superficialThickness.html) http://www.bgs.ac.uk/products/onshore/superficialThickness.html).] Where the depth of rockhead in boreholes differed from the rockhead model, the borehole depth was preferred.

	[[Image:14013 fig1.jpg\|thumb\|400px\| ]]		[[Image:14013 fig1.jpg\|thumb\|400px\| Modelled blocks.]]
	===Water modelling===		===Water modelling===
	A consistent approach to the modelling of water was attempted across all the modelled blocks shown in the figure right. Firstly, a water envelope (extent) was extracted from the OS 1:10 000 scale Open data digital map. Judgement was then used to extract a subset of the larger water bodies from that map data such that the River Clyde, the lower parts of the White Cart and Black Cart waters and lakes/reservoirs exceeding approximately 150 m in width/length are included in the 3D model.		A consistent approach to the modelling of water was attempted across all the modelled blocks shown in the figure right. Firstly, a water envelope (extent) was extracted from the OS 1:10 000 scale Open data digital map. Judgement was then used to extract a subset of the larger water bodies from that map data such that the River Clyde, the lower parts of the White Cart and Black Cart waters and lakes/reservoirs exceeding approximately 150 m in width/length are included in the 3D model.

Dbk: /* Water modelling */

2015-08-06T08:13:43Z

Water modelling

← Older revision		Revision as of 09:13, 6 August 2015
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	A consistent approach to the modelling of water was attempted across all the modelled blocks shown in the figure right. Firstly, a water envelope (extent) was extracted from the OS 1:10 000 scale Open data digital map. Judgement was then used to extract a subset of the larger water bodies from that map data such that the River Clyde, the lower parts of the White Cart and Black Cart waters and lakes/reservoirs exceeding approximately 150 m in width/length are included in the 3D model.		A consistent approach to the modelling of water was attempted across all the modelled blocks shown in the figure right. Firstly, a water envelope (extent) was extracted from the OS 1:10 000 scale Open data digital map. Judgement was then used to extract a subset of the larger water bodies from that map data such that the River Clyde, the lower parts of the White Cart and Black Cart waters and lakes/reservoirs exceeding approximately 150 m in width/length are included in the 3D model.

	During modelling, the water bodies were generally fitted to the water envelope and not to the DTM as it is assumed that users will wish to attach the model to an OS map base rather than a derived/simplified NextMap DTM. The result is that in a few places where the DTM and OS map data do not match, water appears as if it goes uphill. In places (e.g. Balgray reservoir) other artefacts exist within the modelled water (e.g. where there is a bridge over the reservoir the DTM/water volume is raised up as the bridge is not modelled as such). In some areas there is made ground beneath water at dams, or along tidal parts of the River Clyde. The OS Open data envelope (extent) for water which extended to high water mark ''was ''edited within the intertidal zone in the Clydebank and western Central Glasgow models such that it fitted the NEXTmap® DTM in which ocean surface is levelled to OSGB1936 geodetic datum (i.e.zero metres relative to OD, or low water mark).		During modelling, the water bodies were generally fitted to the water envelope and not to the DTM as it is assumed that users will wish to attach the model to an OS map base rather than a derived/simplified NextMap DTM. The result is that in a few places where the DTM and OS map data do not match, water appears as if it goes uphill. In places (e.g. Balgray reservoir) other artefacts exist within the modelled water (e.g. where there is a bridge over the reservoir the DTM/water volume is raised up as the bridge is not modelled as such). In some areas there is made ground beneath water at dams, or along tidal parts of the River Clyde. The OS Open data envelope (extent) for water which extended to high water mark ''was ''edited within the intertidal zone in the Clydebank and western Central Glasgow models such that it fitted the NEXTmap® DTM in which ocean surface is levelled to OSGB1936 geodetic datum (i.e. zero metres relative to OD, or low water mark).

	The depth of water within the tidal limit of the River Clyde was based approximately on a UK Hydrographic Office Admiralty Chart (International Chart Series c.2000). Where no information is available a sub-rectangular river channel cross-section has been assumed.		The depth of water within the tidal limit of the River Clyde was based approximately on a UK Hydrographic Office Admiralty Chart (International Chart Series c.2000). Where no information is available a sub-rectangular river channel cross-section has been assumed.

Dbk at 08:13, 6 August 2015

2015-08-06T08:13:18Z

← Older revision		Revision as of 09:13, 6 August 2015
Line 6:		Line 6:
	[[Image:14013 fig1.jpg\|thumb\|400px\| ]]		[[Image:14013 fig1.jpg\|thumb\|400px\| ]]
	===Water modelling===		===Water modelling===
	A consistent approach to the modelling of water was attempted across all the modelled blocks shown ~~on [[:File:14013 fig1.jpg \| Figure 1]]~~. Firstly, a water envelope (extent) was extracted from the OS 1:10 000 scale Open data digital map. Judgement was then used to extract a subset of the larger water bodies from that map data such that the River Clyde, the lower parts of the White Cart and Black Cart waters and lakes/reservoirs exceeding approximately 150 m in width/length are included in the 3D model.		A consistent approach to the modelling of water was attempted across all the modelled blocks shown in the figure right. Firstly, a water envelope (extent) was extracted from the OS 1:10 000 scale Open data digital map. Judgement was then used to extract a subset of the larger water bodies from that map data such that the River Clyde, the lower parts of the White Cart and Black Cart waters and lakes/reservoirs exceeding approximately 150 m in width/length are included in the 3D model.

	During modelling, the water bodies were generally fitted to the water envelope and not to the DTM as it is assumed that users will wish to attach the model to an OS map base rather than a derived/simplified NextMap DTM. The result is that in a few places where the DTM and OS map data do not match, water appears as if it goes uphill. In places (e.g. Balgray reservoir) other artefacts exist within the modelled water (e.g. where there is a bridge over the reservoir the DTM/water volume is raised up as the bridge is not modelled as such). In some areas there is made ground beneath water at dams, or along tidal parts of the River Clyde. The OS Open data envelope (extent) for water which extended to high water mark ''was ''edited within the intertidal zone in the Clydebank and western Central Glasgow models such that it fitted the NEXTmap® DTM in which ocean surface is levelled to OSGB1936 geodetic datum (i.e.zero metres relative to OD, or low water mark).		During modelling, the water bodies were generally fitted to the water envelope and not to the DTM as it is assumed that users will wish to attach the model to an OS map base rather than a derived/simplified NextMap DTM. The result is that in a few places where the DTM and OS map data do not match, water appears as if it goes uphill. In places (e.g. Balgray reservoir) other artefacts exist within the modelled water (e.g. where there is a bridge over the reservoir the DTM/water volume is raised up as the bridge is not modelled as such). In some areas there is made ground beneath water at dams, or along tidal parts of the River Clyde. The OS Open data envelope (extent) for water which extended to high water mark ''was ''edited within the intertidal zone in the Clydebank and western Central Glasgow models such that it fitted the NEXTmap® DTM in which ocean surface is levelled to OSGB1936 geodetic datum (i.e.zero metres relative to OD, or low water mark).

Dbk at 08:12, 6 August 2015

2015-08-06T08:12:50Z

← Older revision		Revision as of 09:12, 6 August 2015
Line 4:		Line 4:
	Where no boreholes were present, basal units were modelled to the BGS rockhead model (see [http://www.bgs.ac.uk/products/onshore/superficialThickness.html) http://www.bgs.ac.uk/products/onshore/superficialThickness.html).] Where the depth of rockhead in boreholes differed from the rockhead model, the borehole depth was preferred.		Where no boreholes were present, basal units were modelled to the BGS rockhead model (see [http://www.bgs.ac.uk/products/onshore/superficialThickness.html) http://www.bgs.ac.uk/products/onshore/superficialThickness.html).] Where the depth of rockhead in boreholes differed from the rockhead model, the borehole depth was preferred.

			[[Image:14013 fig1.jpg\|thumb\|400px\| ]]
	===Water modelling===		===Water modelling===
	A consistent approach to the modelling of water was attempted across all the modelled blocks shown on [[:File:14013 fig1.jpg \| Figure 1]]. Firstly, a water envelope (extent) was extracted from the OS 1:10 000 scale Open data digital map. Judgement was then used to extract a subset of the larger water bodies from that map data such that the River Clyde, the lower parts of the White Cart and Black Cart waters and lakes/reservoirs exceeding approximately 150 m in width/length are included in the 3D model.		A consistent approach to the modelling of water was attempted across all the modelled blocks shown on [[:File:14013 fig1.jpg \| Figure 1]]. Firstly, a water envelope (extent) was extracted from the OS 1:10 000 scale Open data digital map. Judgement was then used to extract a subset of the larger water bodies from that map data such that the River Clyde, the lower parts of the White Cart and Black Cart waters and lakes/reservoirs exceeding approximately 150 m in width/length are included in the 3D model.

Dbk: Protected "OR/14/013 Model assumptions geological rules used" ([Edit=Allow only administrators] (indefinite) [Move=Allow only administrators] (indefinite)) [cascading]

2015-05-05T14:39:52Z

Protected "OR/14/013 Model assumptions geological rules used" ([Edit=Allow only administrators] (indefinite) [Move=Allow only administrators] (indefinite)) [cascading]

← Older revision	Revision as of 15:39, 5 May 2015
(No difference)

Dbk: Created page with "notoc {{OR/14/013}} ==Superficial deposits== Where no boreholes were present, basal units were modelled to the BGS rockhead model (see [http://www.bgs.ac.uk/products/onsho..."

2015-03-31T13:41:23Z

Created page with "__notoc__ {{OR/14/013}} ==Superficial deposits== Where no boreholes were present, basal units were modelled to the BGS rockhead model (see [http://www.bgs.ac.uk/products/onsho..."

New page

__notoc__
{{OR/14/013}}
==Superficial deposits==
Where no boreholes were present, basal units were modelled to the BGS rockhead model (see [http://www.bgs.ac.uk/products/onshore/superficialThickness.html) http://www.bgs.ac.uk/products/onshore/superficialThickness.html).] Where the depth of rockhead in boreholes differed from the rockhead model, the borehole depth was preferred.

===Water modelling===
A consistent approach to the modelling of water was attempted across all the modelled blocks shown on [[:File:14013 fig1.jpg | Figure 1]]. Firstly, a water envelope (extent) was extracted from the OS 1:10 000 scale Open data digital map. Judgement was then used to extract a subset of the larger water bodies from that map data such that the River Clyde, the lower parts of the White Cart and Black Cart waters and lakes/reservoirs exceeding approximately 150 m in width/length are included in the 3D model.

During modelling, the water bodies were generally fitted to the water envelope and not to the DTM as it is assumed that users will wish to attach the model to an OS map base rather than a derived/simplified NextMap DTM. The result is that in a few places where the DTM and OS map data do not match, water appears as if it goes uphill. In places (e.g. Balgray reservoir) other artefacts exist within the modelled water (e.g. where there is a bridge over the reservoir the DTM/water volume is raised up as the bridge is not modelled as such). In some areas there is made ground beneath water at dams, or along tidal parts of the River Clyde. The OS Open data envelope (extent) for water which extended to high water mark ''was ''edited within the intertidal zone in the Clydebank and western Central Glasgow models such that it fitted the NEXTmap® DTM in which ocean surface is levelled to OSGB1936 geodetic datum (i.e.zero metres relative to OD, or low water mark).

The depth of water within the tidal limit of the River Clyde was based approximately on a UK Hydrographic Office Admiralty Chart (International Chart Series c.2000). Where no information is available a sub-rectangular river channel cross-section has been assumed.

The depth of reservoirs was unknown and so they were modelled to water depth of about 10 m.

===Bedrock ===
It is assumed that all data types (borehole, mine plan, map) are included with equal weight in the modelled surface calculation, though in reality some data may be more certain than others. Data points were excluded if clearly erroneous, based on the geologist’s judgement.

[[category:OR/14/013 Clyde superficial deposits and bedrock models released to the ASK Network 2014: a guide for users Version 3| 05]]