Dbk: Protected "OR/14/066 Model datasets" ([Edit=Allow only administrators] (indefinite) [Move=Allow only administrators] (indefinite)) [cascading]

2016-02-15T13:36:40Z

Protected "OR/14/066 Model datasets" ([Edit=Allow only administrators] (indefinite) [Move=Allow only administrators] (indefinite)) [cascading]

← Older revision	Revision as of 14:36, 15 February 2016
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2016-02-15T13:34:05Z

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Ajhil: /* Offshore seismic data */

2016-02-11T15:47:18Z

Offshore seismic data

New page

__NOTOC__
{{OR/14/066}}
The data used to develop the Forres model is described below. Some general caveats regarding BGS datasets and interpretations are:
* Geological observations and interpretations are made according to the prevailing understanding of the subject at the time. The quality of such observations and interpretations may be affected by the availability of new data, by subsequent advances in knowledge, improved methods of interpretation, improved databases and modelling software, and better access to sampling locations
* Raw data may have been transcribed from analogue to digital format, or may have been acquired by means of automated measuring techniques. Although such processes are subjected to quality control to ensure reliability where possible, some raw data may have been processed without human intervention and may in consequence contain undetected errors

==Raw data==
Raw data used to develop the Culloden-Nairn model include digital terrain models, borehole data, digital geological shapefiles, additional field observations and bathymetric data. All the data are located at: 
W:\Teams\QES\QMMP\Data\MorayNessBasin_Data\GSI3D Great Glen to Moray Firth\CULLODEN-NAIRN Model\Data

===Digital Terrain Models (DTM’s)===
Two DTM’s were extracted for use with this model, NextMap and Bald Earth both at 50 m resolution. The Bald Earth DTM was chosen as the NextMap DTM had a tendency to show artefacts such as trees, which would distort the true ground surface. The Bald Earth DTM was stored as a TIN within the GSI3D workspace.

===Borehole data===
Borehole data were entered into the BGS corporate database, BGS Borehole Geology according to the project GVS. The borehole information was extracted via the Data Portal for the model area using interpreter ‘ECAL’ and in total there were 473 boreholes and trial pits within the model boundary. Figure 2. In order to capture some deep boreholes out with the project area a buffer zone was introduced to capture these boreholes, e.g. Dalroy boreholes 1, 2 and 3, drilled up to 50.43 metres in depth. Boreholes were generally hung according to the DTM used, however where the DTM was affected by artefacts, e.g. pylons, the boreholes were aligned with the contour values.

[[Image:OR14066fig2.jpg|thumb|center|500px| '''Figure 2''' Location of boreholes (including field information data). ]]

===Field information data===
Field data points providing information on the deposits and their thickness were compiled into Excel tables and converted into ‘.bid’ and ‘.blg’ files for use in the modelling. Two different sources of field data were used.
# BGS report WA/93/28R (Merritt and Auton, 1993) contained natural sections which were recorded during field mapping in the 1990’s. The information from these sites was recorded into an Excel table with additional information added, that is lithology, lithostrat and a GVS code for use with the GSI3D model
# Information on outcrops collected during SIGMA (System for Integrated Geoscience Mapping) mapping in 2010/2011 was extracted as field observation points, Table 2 and Table 3. This information was populated into an Excel table

The two Excel tables were then merged with the ‘.bid’ and ‘.blg’ files from the Data Portal to create one ‘.bid’ file and one ‘.blg’ file for importing into GSI3D.

<center>
{| class="wikitable"
|+ Table 2    Field points gathered from SIGMA mapping shown as a .bid file for import into GSI3D 
| ! scope="col" style="width: 100px;" | '''Loc. No.'''
| ! scope="col" style="width: 100px;" | '''X'''
| ! scope="col" style="width: 100px;" | '''Y'''
| ! scope="col" style="width: 100px;" | '''Start Height'''
| ! scope="col" style="width: 100px;" | '''Source'''
| ! scope="col" style="width: 100px;" | '''10K sheet'''
|-
| CA 1283
| 293730
| 858720
| 19.86
| SIGMA
| NH95NW(n)
|-
| CA 1284
| 293730
| 858720
| 19.86
| SIGMA
| NH95NW(n)
|-
| CA 1285
| 294080
| 857860
| 26.17
| SIGMA
| NH95NW(n)
|-
| CA 1290
| 293940
| 857320
| 33.94
| SIGMA
| NH95NW(s)
|-
| CA 1303
| 294090
| 856690
| 36.59
| SIGMA
| NH95NW(s)
|-
| CA 1304
| 294030
| 855780
| 35.72
| SIGMA
| NH95NW(s)
|-
| CA 1305
| 294170
| 855960
| 32.43
| SIGMA
| NH95NW(s)
|-
| CA 1306
| 294100
| 855980
| 31.59
| SIGMA
| NH95NW(s)
|-
| CA 1360
| 290440
| 855030
| 26.61
| SIGMA
| NH95NW(s)
|-
| CA 1369
| 294950
| 855270
| 46.51
| SIGMA
| NH95NW(s)
|-
| CA 1370
| 293980
| 855540
| 39.60
| SIGMA
| NH95NW(s)
|-
| CA1134
| 286810
| 856000
| 21.61
| SIGMA
| NH85NE(s)
|-
| CA1142
| 287680
| 854140
| 15.35
| SIGMA
| NH85SE(n)
|-
| CA1144
| 287790
| 854280
| 13.45
| SIGMA
| NH85SE(n)
|-
| CA1149
| 288650
| 856170
| 9.29
| SIGMA
| NH85NE(s)
|-
| CA1150
| 288540
| 856400
| 3.23
| SIGMA
| NH85NE(s)
|-
| CA1151
| 288150
| 855460
| 14.26
| SIGMA
| NH85NE(s)
|-
| CA1152
| 288330
| 855580
| 10.01
| SIGMA
| NH85NE(s)
|-
| CA1153
| 288400
| 853270
| 25.88
| SIGMA
| NH85SE(n)
|-
| CA1169
| 289740
| 856980
| 16.00
| SIGMA
| NH85NE(s)
|-
| CA1170
| 289670
| 856910
| 15.05
| SIGMA
| NH85NE(s)
|-
| CA1171
| 289570
| 856730
| 16.78
| SIGMA
| NH85NE(s)
|-
| CA1173
| 288910
| 855420
| 11.50
| SIGMA
| NH85NE(s)
|-
| CA1191
| 289670
| 856350
| 17.45
| SIGMA
| NH85NE(s)
|-
| CA1281
| 293260
| 858180
| 23.67
| SIGMA
| NH95NW(n)
|-
| CA1282
| 293280
| 858280
| 21.22
| SIGMA
| NH95NW(n)
|-
| CA1287
| 292940
| 858140
| 13.16
| SIGMA
| NH95NW(n)
|-
| CA1363
| 291700
| 855550
| 22.44
| SIGMA
| NH95NW(s)
|-
| CA1364
| 292570
| 855600
| 37.71
| SIGMA
| NH95NW(s)
|-
| CA1365
| 293110
| 854690
| 40.69
| SIGMA
| NH95SW(n)
|-
| CA1366
| 293220
| 854870
| 37.10
| SIGMA
| NH95SW(n)
|-
| CA1367
| 293010
| 854860
| 34.47
| SIGMA
| NH95SW(n)
|-
| CA1368
| 293400
| 854770
| 39.37
| SIGMA
| NH95SW(n)
|-
| CA1371
| 293830
| 854660
| 46.82
| SIGMA
| NH95SW(n)
|-
| CAA_105
| 291955
| 853472
| 44.13
| SIGMA
| NH95SW(n)
|-
| CAA_109
| 291161
| 852352
| 58.70
| SIGMA
| NH95SW(n)
|-
| CAA_110
| 291086
| 852432
| 52.19
| SIGMA
| NH95SW(n)
|-
| CAA_122
| 294953
| 852654
| 85.32
| SIGMA
| NH95SW(n)
|-
| CAA19981
| 286940
| 856820
| 9.92
| SIGMA
| NH85NE(s)
|-
| CAA19982
| 288480
| 856600
| 20.87
| SIGMA
| NH85NE(s)
|-
| CAA19983
| 289600
| 855720
| 18.60
| SIGMA
| NH85NE(s)
|-
| CAA19984
| 288920
| 856410
| 12.17
| SIGMA
| NH85NE(s)
|-
| CAA19985
| 289790
| 855670
| 17.36
| SIGMA
| NH85NE(s)
|-
| CAA19986
| 289350
| 854130
| 35.62
| SIGMA
| NH85SE(n)
|-
| CAA19987
| 294800
| 858710
| 12.69
| SIGMA
| NH95NW(n)
|-
| CAA19988
| 294750
| 859040
| 12.99
| SIGMA
| NH95NW(n)
|-
| CAA19989
| 294630
| 855900
| 44.01
| SIGMA
| NH95NW(s)
|-
| CAA19990
| 294120
| 856320
| 30.15
| SIGMA
| NH95NW(s)
|-
| CAA19991
| 294840
| 855670
| 49.03
| SIGMA
| NH95NW(s)
|-
| CAA19992
| 290600
| 856260
| 9.69
| SIGMA
| NH95NW(s)
|-
| CAA19993
| 290330
| 856370
| 16.31
| SIGMA
| NH95NW(s)
|-
| CAA19994
| 295050
| 856690
| 30.77
| SIGMA
| NH95NE(s)
|-
| JDEV11
| 296967
| 855456
| 46.68
| SIGMA
| NH95NE(s)
|-
| JDEV16
| 299515
| 852944
| 100.99
| SIGMA
| NH95NE(s)
|-
| JDEV20
| 297323
| 854968
| 65.95
| SIGMA
| NH95NE(s)
|-
| JDEV21
| 297674
| 854334
| 77.22
| SIGMA
| NH95NE(s)
|-
| JDEV5
| 298810
| 855060
| 78.08
| SIGMA
| NH95NE(n)
|-
| JDEV7
| 295330
| 858260
| 45.78
| SIGMA
| NH95NE(n)
|-
| JDEV8
| 297990
| 859910
| 23.92
| SIGMA
| NH95NE(n)
|-
| MFN1
| 290381
| 852721
| 81.85
| SIGMA
| NH95SW(n)
|-
| MFN2
| 297500
| 855250
| 80.37
| SIGMA
| NH95NE(s)
|-
| MFN3
| 299380
| 850030
| 196.34
| SIGMA
| NH95SE(s)
|}
</center>

<center>
{| class="wikitable"
|+ Table 3     Field points gathered from SIGMA mapping shown as a .blg file for import into GSI3D 
|- style="vertical-align:top;"
| ! scope="col" style="width: 90px;" | '''Loc. No.'''
| ! scope="col" style="width: 75px;" | '''Depth to base of unit'''
| ! scope="col" style="width: 175px;" | '''Lithology Code'''
| ! scope="col" style="width: 100px;" | '''GVS'''
| ! scope="col" style="width: 225px;" | '''Lithostrat'''
|-
| CA 1283
| 0.30
| Soil
| RMBDD
| Raised marine deposits Late D.
|-
| CA 1283
| 0.70
| Sand with tabular cobbles
| RMBDD
| Raised marine deposits Late D.
|-
| CA 1283
| 1.10
| gravel
| RMBDD
| Raised marine deposits Late D.
|-
| CA 1283
| 1.50
| gravel
| GSG4
| glaciofluvial sheet deposit
|-
| CA 1283
| 2.00
| iron/manganeese pan
| KISA
| ferruginous weathered sst?
|-
| CA 1283
| 2.20
| clay
| KISA
| weathered mudstone?
|-
| CA 1284
| 1.00
| no lithology
| BSA
| Blown sand
|-
| CA 1284
| 2.20
| sand with clay wisps
| RMDF4
| Flandrian Raised beach 4?
|-
| CA 1285
| 2.00
| No lithology
| ALV1
| Alluvium
|-
| CA 1285
| 2.50
| Diamicton
| TILL
| Till (?4)
|-
| CA 1290
| 2.10
| sandy diamicton
| MORD
| morainic deposits
|-
| CA 1303
| 2.00
| sandy diamicton
| MORD
| morainic deposits
|-
| CA 1304
| 0.50
| sandstone
| HSA
| HSA ( fault slightly on wrong side!)
|-
| CA 1305
| 3.00
| sandy gravel
| GSG4
| glaciofluvial sheet deposit
|-
| CA 1306
| 2.00
| pebbly diamicton
| TILL6
| Till
|-
| CA 1306
| 2.10
| siltstone
| HSA
| HSA
|-
| CA 1360
| 0.60
| humic silt & clay
| ALV1
| Alluvium
|-
| CA 1360
| 1.20
| sandy silty
| ARDS
| Ardersier Silts
|-
| CA 1369
| 1.50
| contorted gravel & sand
| GSG4
| subglacial esker gravel
|-
| CA 1370
| 0.20
| Soil
| TILL6
| Till
|-
| CA 1370
| 1.70
| diamicton
| TILL6
| Till
|-
| CA1134
| 0.30
| MGR
| MGR
| MGR
|-
| CA1134
| 1.00
| gravel
| RTFDD
| raised tidal flat deposits
|-
| CA1134
| 1.30
| sand
| RTFDD
| raised tidal flat deposits
|-
| CA1134
| 2.10
| sand
| ARDS
| Ardersier Silts
|-
| CA1134
| 2.90
| sand
| ARDS
| Ardersier Silts
|-
| CA1134
| 3.20
| silt
| ARDS
| Ardersier Silts
|-
| CA1142
| 3.50
| Sst + Mudstone
| INS
| INS
|-
| CA1144
| 2.00
| Cong. + Sst
| RCCN
| RCCN
|-
| CA1149
| 1.00
| Sandstone
| NSTN
| NSTN
|-
| CA1150
| 3.00
| Sandstone
| NSTN
| NSTN
|-
| CA1151
| 0.30
| soil
| RTFDD
| raised tidal flat deposits
|-
| CA1151
| 2.20
| sand
| ARDS
| Ardersier Silts
|-
| CA1151
| 2.60
| gravel
| ARDS
| Ardersier Silts
|-
| CA1151
| 3.30
| sand & silt
| ARDS
| Ardersier Silts
|-
| CA1152
| 2.00
| Sandstone
| NSTN
| NSTN
|-
| CA1153
| 5.00
| sand & gravel
| GSG4
| Ice contact sand & gravel
|-
| CA1169
| 5.00
| Sandstone
| KISA
| KISA
|-
| CA1170
| 2.50
| Sandstone
| KISA
| KISA
|-
| CA1171
| 1.30
| MGR
| MGR
| MGR
|-
| CA1171
| 1.40
| Soil
| ARDS
| Ardersier Silts
|-
| CA1171
| 2.20
| sand
| ARDS
| Ardersier Silts
|-
| CA1173
| 2.90
| Sand
| RTFDD
| raised tidal flat deposits
|-
| CA1173
| 3.60
| sand & clayey silt
| ARDS
| Ardersier Silts
|-
| CA1191
| 0.20
| MGR
| MGR
| MGR
|-
| CA1191
| 0.50
| Sand
| RTFDD
| raised tidal flat deposits
|-
| CA1191
| 0.60
| silt
| ARDS
| Ardersier Silts
|-
| CA1191
| 0.90
| Sand
| ARDS
| Ardersier Silts
|-
| CA1191
| 1.00
| silt
| ARDS
| Ardersier Silts
|-
| CA1191
| 2.00
| Sand
| ARDS
| Ardersier Silts
|-
| CA1191
| 2.80
| diamicton
| BALT
| Balmakeith Till Member (lens)
|-
| CA1281
| 0.60
| sand
| RMBDD
| Raised marine deposits Late D.
|-
| CA1281
| 0.80
| sand, silty
| RMBDD
| Raised marine deposits Late D.
|-
| CA1282
| 2.30
| sandstone & congl.
| KISA
| KISA
|-
| CA1287
| 0.80
| Sand with tabular cobbles
| RMBDD
| Raised marine deposits Late D.
|-
| CA1287
| 2.40
| openwork gravel
| RMBDD
| Raised marine deposits Late D.
|-
| CA1363
| 0.30
| soil
| ALGR
| Alturlie gravels
|-
| CA1363
| 0.70
| gravel
| ALGR
| Alturlie gravels
|-
| CA1363
| 1.50
| sand gravel and silt
| ALGR
| Alturlie gravels
|-
| CA1364
| 0.50
| Soil
| TILL6
| Till
|-
| CA1364
| 1.80
| diamicton
| TILL6
| Till
|-
| CA1364
| 2.50
| decomposed sandstone
| HSA
| Hillhead Sandstone (lens)
|-
| CA1365
| 0.20
| soil
| GSG4
| Ice contact sand & gravel
|-
| CA1365
| 1.90
| gravel
| GSG4
| Ice contact sand & gravel
|-
| CA1366
| 2.00
| sandstone
| INS
| INS
|-
| CA1367
| 0.40
| soil
| GSG4
| glaciofluvial sheet deposit
|-
| CA1367
| 0.90
| gravel
| GSG4
| glaciofluvial sheet deposit
|-
| CA1367
| 1.70
| diamicton
| TILL6
| Till
|-
| CA1368
| 4.50
| gravel
| GSG4
| subglacial esker gravel
|-
| CA1368
| 4.80
| sand
| GSG4
| subglacial esker sand
|-
| CA1368
| 5.10
| silt
| GSG4
| subglacial esker silt
|-
| CA1368
| 5.50
| sand
| GSG4
| subglacial esker sand
|-
| CA1368
| 7.00
| gravel
| GSG4
| subglacial esker gravel
|-
| CA1371
| 0.40
| soil
| GSG4
| Ice contact sand & gravel
|-
| CA1371
| 0.90
| gravel
| GSG4
| Ice contact sand & gravel
|-
| CA1371
| 1.50
| clayey silt
| GSG4
| Ice contact sand & gravel
|-
| CA1371
| 4.00
| gravel
| GSG4
| Ice contact sand & gravel
|-
| CAA_105
| 1.20
| cobble gravel
| GSG4
| glaciofluvial sheet deposit
|-
| CAA_109
| 1.00
| cobble gravel
| RTD1
| River Terrace deposits
|-
| CAA_110
| 1.30
| Peat
| PEAT1
| Peat
|-
| CAA_110
| 2.30
| sand
| ALV1
| Alluvium
|-
| CAA_122
| 7.00
| Conglomerate
| MBCN
| MBCN
|-
| CAA19981
| 5.00
| Sandstone
| KISA
| KISA
|-
| CAA19982
| 0.30
| MGR
| MGR
| MGR
|-
| CAA19982
| 0.80
| diamicton
| TILL
| Till (?till2)
|-
| CAA19983
| 0.30
| peat
| LDE
| lacustrine deposits
|-
| CAA19983
| 0.70
| silt
| LDE
| lacustrine deposits
|-
| CAA19984
| 3.00
| MGR
| MGR
| MGR
|-
| CAA19985
| 2.00
| sand
| RTFDD
| raised tidal flat deposits
|-
| CAA19986
| 3.00
| bolder & cob. Grav.
| GSG4
| subglacial esker gravel
|-
| CAA19987
| 0.20
| sand
| BSA
| Blown sand
|-
| CAA19987
| 0.50
| sand ferruginous
| RMDF4
| Flandrian Raised beach 4
|-
| CAA19988
| 0.50
| peat
| LDE
| Lacustrine deposits
|-
| CAA19988
| 0.70
| clayey silt
| LDE
| Lacustrine deposits
|-
| CAA19989
| 10.00
| cobbly gravel
| GSG4
| subglacial esker gravel
|-
| CAA19989
| 10.10
| sandstone
| INS
| INS
|-
| CAA19990
| 2.00
| sand
| ALV1
| alluvium
|-
| CAA19991
| 2.50
| cobbly gravel
| GSG4
| subglacial esker gravel
|-
| CAA19991
| 2.60
| silt
| GSG4
| subglacial esker silt
|-
| CAA19992
| 0.70
| clayey silt
| ALV1
| alluvium
|-
| CAA19992
| 0.80
| gravel
| ALV1
| alluvium
|-
| CAA19993
| 1.50
| sand
| RTFDD
| raised tidal flat deposits
|-
| CAA19994
| 1.50
| sand
| ALV1
| alluvium
|-
| JDEV11
| 8.00
| sandstone
| NSTN
| NSTN
|-
| JDEV16
| 10.00
| sand and gravel
| GSG4
| Ice contact sand & gravel
|-
| JDEV20
| 2.00
| sandstone
| KISA
| KISA
|-
| JDEV21
| 2.00
| sandstone
| KISA
| KISA
|-
| JDEV5
| 6.00
| sand and gravel
| GSG4
| Ice contact sand & gravel
|-
| JDEV7
| 2.00
| sand and gravel
| MORD
| Moraine
|-
| JDEV8
| 1.00
| diamicton
| TILL4
| Till
|-
| JDEV8
| 2.00
| silt and clay
| ARDS
| Ardersier silts
|-
| MFN1
| 1.00
| diamicton
| TILL6
| Till
|-
| MFN2
| 2.50
| sand and gravel
| GSG4
| Ice contact sand & gravel
|-
| MFN3
| 3.00
| sand and gravel
| GSG4
| Ice contact sand & gravel
|}
</center>

===Raster and shapefile data===
* Topographic maps at 1:25 000 scale were extracted for the project area
* Two figures (22 and 28) from the Fortrose memoir (Fletcher et al., 1996<ref name="Fletcher 1996">FLETCHER, T P, AUTON, C A, HIGHTON, A J, MERRITT, J W, ROBERTSON, S, and ROLLIN, K E. 1996. Geology of Fortrose and eastern Inverness district: Memoir of the British Geological Survey, Sheet 84W (Scotland). London. H.M.S.O.</ref>) were scanned and georeferenced for use within the GSI3D project
* Two sections from the Fortrose 1:50 000 84W sheet (1997) were scanned and their raster files were used to create two sections within the project

===Contour data===
Onshore contours were provided from Ordnance Survey data at 5 m intervals.

Offshore bathymetry was provided as a shapefile from Arc. The files were clipped to the project area and converted into British National Grid from Latitude and Longitude.

===Geological linework data===
The modelled area encompasses three 1:50 000 sheet areas, Fortrose (84W), Nairn (84E) and Cromarty (94E). The Fortrose sheet was published in 1997 and linework which was available digitally from DigMap was clipped to the model area. The Nairn sheet was under revision at the time of modelling this area but 1:10 000 scale maps were available due to recent mapping and stored within the CartoGIS department. The digitally stored linework at this scale was imported into GSI3D as shapefiles. The geological linework for NH96SW part of Cromarty (94E) was also clipped and imported into GSI3D as a shapefile.

The offshore 1:250 000 Seabed Sediment map for Moray-Buchan (BGS) was clipped in Arc and converted into British National Grid from Latitude and Longitude. The offshore map was imported into GSI3D.

===Offshore seismic data===
In 2012 BGS undertook survey work in the Inner Moray Firth to acquire seismic and multibeam data. In an area of approximately 15 km by 5 km 33 lines were shot, Figure 3.

[[Image:OR14066fig3.jpg|thumb|center|400px| '''Figure 3''' NextMap© image showing the seismic tracks for the Inner Moray Survey. ]]

12 seismic lines (45, 46, 47, 48, 54, 59, 60, 64, 66, 67, 69 and 78) were interpreted and converted into jpeg format files, Figure 4. Before they could be imported into GSI3D the linework had to be converted to British National Grid which was undertaken in Arc. Due to the size of the files the images were cropped and resampled in order to be imported into GSI3D.

[[Image:OR14066fig4.jpg|thumb|center|500px| '''Figure 4''' Seismic line 67, note also the high point of the seabed that forms the north-eastern margin of the present day channel. The angular discontinuity (orange surface) indicates that there have been several phases of deposition in the firth before erosion of the present day channel. ]]

The depth of the cross-sections had to be converted for entry into GSI3D due to the acquisition of the offshore seismic profiles in two-way travel time. The vertical scale is measured in milliseconds and therefore has to be converted into metres.

e.g. 1500 m/s in water (so 10 ms of water on seismic line approx = 7.5 m in reality) & 1700–1800 m/s in soft sediment. N.B. seafloor depth varies across seismic lines, so average value calculated.

An example of calculating depths:-
::{|
| ! scope="col" style="width: 100px;" | ''Section 45''
| ! scope="col" style="width: 600px;" | '': av. depth from sea-level to seabed: 0.020/2 x 1500 = 15 m'' 
|-
|
|'': depth from seabed to base of image: 0.200–0.020 = 0.180, 0.180/2 x 1750 =''157.5 m'' 
|-
|
|'': total depth (top to base of image): 15 m + 157.5 m = 172.5 m'' 
|-
|
|''Figures for importing section 45 as a raster backdrop into GSI3D:'' 
|-
|
|''Top left corner: W=0, Z=0          Bottom right corner: W=2366.6, Z=-172.5'' 
|-
|
|''N.B. where section crosses -10m bathymetry contour, seabed pick lies at -22.5 m''
|}

===Offshore multibeam data===
Multibeam data were collected along seismic tracks, extending approx. 25 m either side of the seismic line, so had a network of data. Attribute table indicates there are 1 585 964 data points, a data point every 2 m over the areas scanned. The deepest value recorded was -45.96 m (between Forth George and Charonry Point) and shallowest was -4.53 m as this was the shallowest that the boat could survey.

The multibeam data gathered were not used in the construction of this model due to problems encountered in trying to import the data into GSI3D.

The file size was too large for GSI3D and even by reducing this; the data were projected in the wrong location. The data were then exported as a simple .xyz file and an .asc file at 5 m resolution (38MB). The attribute table indicated there were 305 622 data points. The files were imported into an empty GSI3D project but the Culloden-Nairn project couldn’t be loaded. The multibeam dtm was visible along the seismic sections where the it existed along the entire length of the section, but if a section cut in and out of the dtm data, the section was not constrained and shot upwards to 96 814 m or downwards to -143 117 m (on a test section). These extreme values made the dtm (as it existed) impossible to view in 3D.

The data are still stored within the project area and can be used for future offshore modelling.

===Additional information===
Cross-sections from other projects were brought into GSI3D as they cut through the Culloden-Nairn project area.
* 10 sections from the Great Glen-Moray Firth GSI3D Faulted Bedrock Model (Arkley, 2014<ref name="Arkley 2014">ARKLEY, S L B. 2014. Model metadata report for the Great Glen-Moray Firth GSI3D Faulted Bedrock Model. ''British Geological Survey, Open Report'', OR/14/058.</ref>)
* 5 sections from the GB-3D bedrock model
* 9 sections from the Moray Ness Regional Model (Finlayson and Arkley, 2014<ref name="Finlayson 2014">FINLAYSON, A G and ARKLEY, S L B. 2014. Model metadata report for the Moray Ness Regional GSI3D model, British Geological Survey, Open Report, OR/14/065.</ref>)

A series of surfaces to replicate the sea-level at different heights were created in GOCAD™ and clipped to the project area. These tin files represented sea level at 0 m, +7 m, +28 m and +42 m.
==References==
<References/>
[[category:OR/14/066 Model metadata report for the Culloden-Nairn GSI3D superficial deposits model| 05]]

OR/14/066 Model datasets - Revision history

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Ajhil: /* Offshore seismic data */