digitisation of large scale geological map data … · 2008-10-23 · all geological lines are...

DIGITISATION OF LARGE SCALE GEOLOGICAL MAP DATA

DIGITISATION SPECIFICATION October 2008

The copyright of this specification is vested in the Natural Environment Research Council (NERC). No part of it may be reproduced or transmitted in any form (analogue or digital), or by any means, or stored in a retrieval system of any nature, without prior written permission. © NERC. All rights reserved.

1 DATA DESCRIPTION

1.0 The maps may include sheets from the British National Grid, County Series, Irish National Grid or Irish Counties Series.

1.1 The source material is a scanned image of a map in JPEG2000 or other universal GIS image format at 300 or 400 dots per inch (dpi).

1.2 Each standard 1:10 000 scale map represents an area of 5x5 km.

Some sheets are nominally 1:10 560 scale but also represent an area of 5x5 km.

In rare cases, an individual sheet may be extended by 1 or 2 km in either direction.

Example extention.

Occasionally a map may have a small area or island inset which must be digitised in its correct geographic position.

Example island insert.

1.3 The County Series maps for both Great Britain and Northern Ireland have similar idiosyncrasies. There is the additional complication that geology may only have been mapped to the country boundary which requires edge matching to the neighbouring county.

1.4 The Northern Ireland sheets tend to be larger in area than those covering Great Britain.

1.5 On all maps some geological interpretation may be necessary. In the case below, the beach deposits are indicated by a grey tone but there is no boundary drawn between the beach deposits and the rock outcrop. A Superficial_polygon_closure should be used to separate the two. Problems with geological interpretation should be referred to BGS for clarification.

2

Example interpretation

1.6 The maps are composed of four elements:

Geological information on the map face and marginalia;

Text on map face and marginalia;

Symbols on map face and marginalia;

Topographic background to map face.

The digitisation primarily concerns the geology on the map face, text and symbols.

1.7 The geological map face information is divided into themes:

BedRock (formerly known as Solid) geology which is always present.

Superficial (formerly known as Drift) deposits which may be present above the Bedrock.

Artificial deposits (such as Made ground, Worked ground)

MassMovement deposits (such as Landslide deposits)

Geology Lines (such as Coal seams, Faults)

Point Information (such as Inclined Strata)

Example point information.

Text Notes on the mapface are NOT required to be captured.

3

Example text notes.

The information consists of text, symbols, boundary lines and polygons. Boundary lines are mostly shown in black. In coastal areas and areas bordering inland water bodies, linework should be captured up to the limit of the geological interpretation as shown on the scanned map at the time of survey.

2 DIGITISATION REQUIREMENTS

2.1 Line and centroid digitisation

2.1.1 Digitisation conventions

2.1.1.1 Lines are coded by linking to the MSLINK primary field from table FEATURE in database BGS_10k_GEOLOGY.MDB. A BedRock_Geology_boundary will therefore be linked via MSLINK 105601 or 105602 depending on whether it was Observed or Inferred.

2.1.1.2 The lines are to be vector digitised lines, not curves, to ensure compatibility with BGS data.

2.1.1.3 Where geological features are shown as parallel lines, e.g. dykes, each BedRock_Geology_boundary line is digitised with a BedRock_polygon_closure at each end of the dyke.

2.1.1.4 All geological lines are digitised as continuous lines where possible.

2.1.1.5 Fault lines are digitised as continuous lines, and not segmented into short sections.

2.1.1.6 Faults and other features symbols may be ‘handed’ i.e. they have ticks or barbs on one side of the line. The line should be digitised in the appropriate direction to ensure that ticks, barbs or other ‘handed’ symbols appear on the correct side of the line as it is digitised. For faults this is always the left.

Example digitising direction.

2.1.1.7 Coincident lines (for example, lines that are both BedRock and Superficial boundaries) are digitised once, their feature coding dictating that they will be used in two or more themes. Where geological lines are coincident with one another for more

4

5

than 50 m (5 mm at map scale) then one of the MULTI_AREA or MULTI_LINEAR features should be used to aid digitising and to maintain quality. An example is where a BedRock Geology boundary is coincident with a Superficial Geology boundary, the line should be attributed with 106208 so that it is recognised as a BedRock_Inf+Superficial feature.

2.1.1.8 Similarly some geological lines (for example, Marine Bands) may appear on the printed map within the colour of a geology polygon or they may form the limit (colour boundary) of the strata. Marine Bands will therefore be attributed as either 105401 or 106201.

2.1.1.9 Some geological lines are described as hidden. These are lines where a colour change occurs but no (black) geological boundary line is shown. They are digitised to enable later polygon processing.

2.1.1.10 Where a geological line stops at the edge of an inland water feature, and the geology cannot be interpreted beneath the water, the limit of the geological interpretation should be captured as feature 10k_Limit_geology_survey; in some cases this line may be coincident with the limit of the inland water feature. In cases where it is clear where the geological line goes under water, for example crossing a narrow stream, then the line is continued beneath the water.

2.1.1.11 Where a geological line stops at the edge of a landslide feature, and the BedRock or Superficial geology cannot be interpreted beneath the landslide, then the landslide feature is digitised and a BedRock_polygon_closure and/or Superficial_polygon_closure are also digitised in the relevant theme.

2.1.1.12 Where a geological line stops at the edge of a foundered strata feature, and the BedRock or Superficial geology cannot be interpreted beneath the foundered strata, then the foundered strata feature is digitised and a BedRock_polygon_closure and/or Superficial_polygon_closure are also digitised in the relevant theme.

2.1.1.13 Where a geological line stops at the edge of an artificial ground feature, and the BedRock or Superficial geology cannot be interpreted beneath the artificial ground, then the artificial ground feature is digitised and a BedRock_polygon_closure and/or Superficial_polygon_closure are also digitised in the relevant theme.

2.1.1.14 In coastal areas geological linework should normally be captured to the limit of onshore geological interpretation as feature 10k_Limit_geology_survey.

2.1.1.15 In estuaries a 10k_Estuary_closure feature is to be digitised across at a convenient point, e.g. where the estuary narrows significantly.

2.1.1.16 Within each sheet area, each geological unit should have one geological centroid. For example in the Superficial theme, if 'Alluvium' is given the code ALV-SAGR, then all occurrences of that Alluvium on the map sheet must be seeded ALV-SAGR.

2.1.1.17 Areas are coded with LEX-ROCK combinations via the primary MSLINK field in table lex_and_rock in database BGS_10k_geology.mdb. This is a three stage operation; entries for each geological sheet can be found in the table BGS_10k_Lexrock.xls. The geological description on the map legend is compared to field Original_Published_Rock_Unit_Name_10k. This gives values

6

for Lex_10k and Rock_10k which form the simple LEX-ROCK code. Areas are attributed with the relevant code by linking to table lex_and_rock. In practice a user would normally pick the area attribution from a pre-created list.

2.1.1.18 A BedRock_polygon_closure or Superficial_polygon_closure should be inserted at the sheet margin where LEX-ROCK centroid codes differ between adjacent map sheets.

2.1.1.19 Where a BedRock formation is totally divided by a fault line, a centroid must be placed either side of the fault line (this is to enable two polygons to be built).

2.1.1.20 The topology rules for each geological theme detailed below must be followed.

2.1.1.21 BedRock Geology Theme Topology. Every boundary participating in the BedRock theme must start and end snapped to another boundary in the BedRock theme with the exception of Faults. Faults can have free ends.

2.1.1.22 Superficial Geology Theme Topology. Every boundary participating in the Superficial theme must start and end snapped to another boundary in the Superficial theme.

2.1.1.23 Artificial Geology Theme Topology. Every boundary participating in the Artificial theme must start and end snapped to another boundary in the Artificial theme.

2.1.1.24 MassMovement Geology Theme Topology. Every boundary participating in the MassMovement theme must start and end snapped to another boundary in the MassMovement theme.

2.1.1.25 Underground data such as Underground_Fault_Inf should be captured but does not form part of any of the topologies.

The above is not an exhaustive list. Further conventions may be added following consultation.

2.1.2 Accuracy and visual appearance

2.1.2.1 The digitised vector line should follow the raster centre line. Minor cartographic smoothing is acceptable but should remain within the limits of the raster line. Reference should be made to the example data supplied.

2.1.2.2 The shape and appearance of the source line must be preserved. Although digital data are composed of a series of straight lines, this should not be apparent at the nominal 1:10 000 scale. This is to be true of both tightly curved lines, e.g. small outcrops, and sinuous lines, e.g. fault lines.

2.1.2.3 Line "snapping" is required to eliminate topological errors.

2.1.3 Data format

2.1.3.1 The digital line and centroids data must be supplied as either MicroStation DGN file format, ESRI Shape format or ESRI ArcGIS9 personal geodatabase format following discussions between BGS and the contractor.

2.1.3.2 BGS is familiar with using data in these formats and would wish to make data delivery simple for the contractor.

2.2 Point Symbol Digitising


2.2.1.0 N.B. GEOLOGICAL AREA SYMBOL DATA IS EXCLUDED.

Symbols representing areas are NOT required to be captured as this information is already represented by the centroids in the Bedrock or Superficial themes.

Example area symbol not to be captured. ALL OTHER GEOLOGICAL POINT SYMBOLS ARE TO BE CAPTURED.

2.2.1.1 See document BGS_point_symbols_index.pdf for further information about point symbols codes.

2.2.1.2 The point symbols are to be vector digitised x and y locations with the appropriate symbol attributes captured.

Example point features to be captured.

Data in ASCII format for these example thumbnails is given below:

X,Y,SYMBOL,ANGLE of ROTATION,ANGLE of DIP,TEXT,COMMENT

234567,678901,S_IS2,50,8,, 234587,678911,S_IS2,110,12,, 345678,789012,BH,,,3, 345688,789002,BH,,,6, 456789,890123,S_HS,,,, 456799,890133,S_HS,,,, 345688,789002,BH,,,WEST SHAFT, 345698,789002,BH,,,SOUTH SHAFT,

7

345698,789012,BH,,,NORTH SHAFT, 123456,456789,ADIT,270,,KENDON COLLIERY, 123466,456799,ADIT,270,,, 123476,456809,ADIT,230,,,

2.2.1.3 The SYMBOL code for each point symbol is given in the document BGS_point_symbols_index.pdf.

Example point symbol S_IS2.

2.2.1.4 ROTATION ANGLE should follow the CAD convention of EAST being 0 degrees and NORTH being 90. Refer to the symbol PDF for the starting orientation for each symbol.

2.2.1.5 The DIP ANGLE as text may be present for certain symbols such as an INCLINED STRATA (S_IS2) where the dip has been measured.

2.2.1.6 The TEXT field should be used for additional text that does not appear with the symbol by default e.g. a Shaft or Adit may have additional text.

2.2.1.7 The COMMENT field should be used to note any problems or ambiguity about the point.


2.2.2.1 The digitised point should coincide with the origin of the symbol on the scan.

2.2.2.2 The symbol origin may vary; Boreholes (BH) are centred, Adits (ADIT) and other arrows have their origin at the symbol’s point. Reference should be made to the example data supplied and to BGS_point_symbols_index.pdf.

2.2.2.3 Point X and Y positions should be accurate to +-1 m (0.1 mm at 1:10 000 scale) and should generally be recorded to the nearest metre.

2.2.2.4 Symbol ROTATION ANGLE should be accurate to +-1 degree and be recorded in whole degrees.

2.2.3 Data format

2.2.3.1 The digital point data must be supplied as either MicroStation DGN file format, ASCII (as in the example above), ESRI Shape format or ESRI personal geodatabase format following discussions between BGS and the contractor.

2.2.3.2 BGS is familiar with using data in these formats and would wish to make data delivery simple for the contractor.

8

9

2.3 Generalised Vertical Section (GVS) digitisation


2.3.1.1 The GVS is treated as a miniature map.

2.3.1.2 LEX-ROCK codes are defined in each map’s look-up table.

2.3.1.3 GVS Lines are coded from the GVS category of features in table FEATURES in database BGS_10k_GEOLOGY.

2.3.1.4 Coal and Marine Band lines should have the appropriate LEX-ROCK code attached.

2.3.1.5 Areas should have LEX-ROCK codes matching those used on the map face instead of the symbols.

2.3.1.6 GVS brackets and descriptive text are not captured.

Note:Not all maps have a GVS.


2.3.2.1 The same general tolerances as for the mapface will be followed.

2.3.2.2 The GVS column width should be standardised at 200 m (20 mm at 1:10 000 scale).

2.3.2.3 The GVS outline boundaries should be squared up both vertically and horizontally. See example.

2.3.3 Data format

2.3.3.1 See example data for format.

3 GEOREGISTRATION REQUIREMENTS.

3.1 Georegistartion conventions.

3.1.1 Each map should be georeferenced to the British National Grid for maps within England, Scotland or Wales. The Irish National Grid is used for maps within Northern Ireland..

3.1.2 Ideally georegistration uses the coordinates printed at the sheet corners.

Example BNG coordinates.

3.1.3 All four corners should be incorporated in the georeferencing.

Acceptable georegistration.

3.1.4 Where the grid corner are not provided with the appropriate National Grid coordinate such as County Series maps then the supplied coverage grid should be used. If neither are available then topographic features may have to be employed.

3.1.5 Where available the internal 1 km grid within the map should also be checked for error. Otherwise topographic features such as cross roads should be checked.

3.1.6 A spreadsheet of georeferencing problems should be maintained including residual errors if available.

10

11

3.2 Accuracy

3.2.1 The centre of the scanned printed line at the corners of each sheet should ideally fall exactly at the relevant grid position. Georeferencing is acceptable if the true grid position falls within the scan of the printed line.

3.2.2 The nominal accuracy for georeferencing should be 1 m with a maximum error of 2 m.

3.2.3 If the map cannot be georeferenced to this accuracy then BGS should be advised prior to digitising.

3.3 Data format

3.3.1 The georeferencing information should be supplied as World File (e.g. J2W).

0.847139994835324210 -0.000191008599176004090 0.000263994460481077840 -0.846821436730184400 423251.37886131555 310429.46591690945

3.3.2 The file naming convention should match the supplied image.

fmsk_020_negc_000118981_001.jp2 Original JP2 file. fmsk_020_negc_000118981_001.j2w Georeferencing file.

Only the J2W georeferencing file is required as a deliverable.

3 FEATURES and TOPOLOGY

3.1 The FEATURE table from BGS_10k_geology.mdb can be used to build a menu to aid digitising.

Menu for picking features

3.2 The FEATURE table should be used to code geological line features. The primary field of this table is the MSLINK value. This is equivalent to a SUBTYPE value in ESRI software. All lines link to their relevant feature via this value.

3.3 The table also indicates which features participate in the topology for each of the four geological themes BedRock, Superficial, Artificial and MassMovement.

3.4 When building geological polygons the features indicated are used as boundaries with the area attribution being inherited from the seed feature

3.5 Listing of FEATURE table.

MSLINK CNAME FNAME FDESC Bedrock_topology

Superficial_topology

Artificial_topology

MassMovement_topology

105101 FAULT Normal_Obs Normal fault, observed Yes No No No

105102 FAULT Reverse_Obs Reverse fault, observed Yes No No No

105103 FAULT Strike_slip_Obs Strike slip fault, observed Yes No No No

105104 FAULT Oblique_slip_Obs Oblique slip fault, observed Yes No No No

105105 FAULT Thrust_Ob_Triangle_on_hangingwall_side Thrust fault, observed; barb on original hanging wall side

Yes No No No

105106 FAULT Slide_Obs_Triangle_on_hangingwall_side Slide, observed; barb on original hanging wall side

Yes No No No

105107 FAULT Shear_zone_Obs Fault shear zone, observed Yes No No No

105108 FAULT Scissor_Obs Scissor fault, observed Yes No No No

105109 FAULT Sub-Triassic_Fault_Obs Underground fault, observed at sub-Triassic unconformity

No No No No

105110 FAULT Underground_Fault_Obs Underground fault, observed No No No No

105111 FAULT Normal_Inf Normal fault, inferred Yes No No No

105112 FAULT Reverse_Inf Reverse fault, inferred Yes No No No

105113 FAULT Strike_slip_Inf Strike slip fault, inferred Yes No No No

12

13



Artificial_topology


105114 FAULT Oblique_slip_Inf Oblique slip fault, inferred Yes No No No

105115 FAULT Thrust_Inf_Triangle_on_hangingwall_side Thrust fault, inferred; barb on original hanging wall side

Yes No No No

105116 FAULT Slide_Inf_Triangle_on_hangingwall_side Slide, inferred; barb on original hanging wall side

Yes No No No

105117 FAULT Shear_zone_Inf Fault shear zone, inferred Yes No No No

105118 FAULT Scissor_Inf Scissor fault, inferred Yes No No No

105119 FAULT Sub-Triassic_Fault_Inf Underground fault, inferred at sub-Triassic unconformity

No No No No

105120 FAULT Underground_Fault_Inf Underground fault, inferred No No No No

105121 FAULT Incrop_of_Fault Underground fault, at unconformity No No No No

105122 FAULT Undifferentiated_Fault_Inf Undifferentiated fault, inferred Yes No No No

105123 FAULT Normal_Inf_Downthrow_unspecified Normal fault, inferred; down throw not specified Yes No No No

105124 FAULT Normal_Inf_Crossmark_on_downthrow_side Normal fault, inferred; crossmarks on downthrow side

Yes No No No

105125 FAULT Normal_Obs_Downthrow_unspecified Normal fault, observed; down throw not specified

Yes No No No

105126 FAULT Normal_Obs_Crossmark_on_downthrow_side Normal fault, observed; crossmark on downthrow side

Yes No No No

105127 FAULT Mineralised_Normal_Inf_Downthrow_unspecified Mineralised normal fault, inferred; down throw not specified

Yes No No No

105128 FAULT Mineralised_Normal_Inf_Crossmark_on_downthrow_side Mineralised normal fault, inferred; crossmarks on downthrow side

Yes No No No

105129 FAULT Mineralised_Normal_Obs_Downthrow_unspecified Mineralised normal fault, observed; down throw not specified

Yes No No No

105130 FAULT Mineralised_Normal_Obs_Crossmark_on_downthrow_side Mineralised normal fault, observed; crossmark on downthrow side

Yes No No No

105131 FAULT Thrust_Obs_hangingwall_unspecified Thrust fault, inferred; barb on original hanging wall side

Yes No No No

105132 FAULT Thrust_Inf_hangingwall_unspecified Thrust fault, inferred; barb on original hanging wall side

Yes No No No

105133 FAULT Slide_Obs_hangingwall_unspecified Thrust fault, inferred; barb on original hanging wall side

Yes No No No

105134 FAULT Slide_Inf_hangingwall_unspecified Thrust fault, inferred; barb on original hanging wall side

Yes No No No

105135 FAULT Brecciation_zone_Obs Fault zone brecciation observed Yes No No No

105136 FAULT Brecciation_zone_Inf Fault zone brecciation inferred Yes No No No

105137 FAULT Sub-Permian_Fault_Inf Underground fault, inferred at sub-Permian unconformity

No No No No

105300 FOLD_AXIS Fold_Axis_Unknown Axial plane trace of major fold of unknown type No No No No

105301 FOLD_AXIS Similar Axial plane trace of similar fold No No No No

105302 FOLD_AXIS Concentric Axial plane trace of concentric fold No No No No

105303 FOLD_AXIS Disharmonic Axial plane trace of disharmonic fold No No No No

105304 FOLD_AXIS Ptygmatic Axial plane trace of ptygmatic fold No No No No

105305 FOLD_AXIS Chevron Axial plane trace of chevron fold No No No No

105306 FOLD_AXIS Kink Axial plane trace of kink fold No No No No

105307 FOLD_AXIS Pre-lithification Axial plane trace of pre-lithification fold No No No No

105308 FOLD_AXIS Anticline Axial plane trace of major anticline No No No No

105309 FOLD_AXIS Syncline Axial plane trace of major syncline No No No No

14



Artificial_topology


105310 FOLD_AXIS Antiform Axial plane trace of major antiform No No No No

105311 FOLD_AXIS Synform Axial plane trace of major synform No No No No

105312 FOLD_AXIS Anticline_pair Axial plane traces of closely spaced anticline pair

No No No No

105313 FOLD_AXIS Syncline_pair Axial plane traces of closely spaced syncline pair

No No No No

105314 FOLD_AXIS Monocline_lower Trace of lower hinge of major monocline; barbs on steep limb

No No No No

105315 FOLD_AXIS Monocline_upper Trace of upper hinge of major monocline; barbs on steep limb

No No No No

105316 FOLD_AXIS Recumbant_fold Axial plane trace of major recumbant fold No No No No

105317 FOLD_AXIS Reclined_fold Axial plane trace of major reclined or vertical fold

No No No No

105318 FOLD_AXIS Antiform_pair Axial plane traces of closely spaced major antiform pair

No No No No

105319 FOLD_AXIS Synform_pair Axial plane traces of closely spaced major synform pair

No No No No

105320 FOLD_AXIS Underground_Syncline Axial plane traces of closely spaced major synform pair

No No No No

105321 FOLD_AXIS Underground_Anticline Axial plane traces of closely spaced major synform pair

No No No No

105401 FOSSIL_HORIZON Marine_band Fossil horizon, marine band No No No No

105402 FOSSIL_HORIZON Coral_band Fossil horizon, coral band No No No No

105403 FOSSIL_HORIZON Mussel_band Fossil horizon, mussel band No No No No

105404 FOSSIL_HORIZON Lingula_band Fossil horizon, lingula band No No No No

105405 FOSSIL_HORIZON Euestheria_band Fossil horizon, eustheria band No No No No

105406 FOSSIL_HORIZON Planolites_band Fossil horizon, planolites band No No No No

105407 FOSSIL_HORIZON Brachiopod_band Fossil horizon, brachiopod band No No No No

105408 FOSSIL_HORIZON Algal_band Fossil horizon, algal band No No No No

105409 FOSSIL_HORIZON Incrop_of_Marine_band Underground fossil horizon at unconformity, marine band

No No No No

105410 FOSSIL_HORIZON Fish_beds Fossil horizon, fish bed No No No No

105501 MINERAL_VEIN Mineral_Vein_Obs Mineral vein, observed No No No No

105502 MINERAL_VEIN Mineral_Vein_Inf Mineral vein, inferred No No No No

105503 ROCK Dyke_linear_Obs Linear dyke, observed No No No No

105504 ROCK Dyke_linear_Inf Linear dyke, inferred No No No No

105505 MINERAL_VEIN Underground_Mineral_Vein_Obs Underground Mineral vein, observed No No No No

105506 MINERAL_VEIN Underground_Mineral_Vein_Inf Underground Mineral vein, inferred No No No No

105549 ROCK Limestone_fissures Limestone fissures No No No No

105550 ROCK Limit_of_Halite Limit of Halite No No No No

105551 ROCK Lithostrat_line_Obs Lithostrat line, observed No No No No

105552 ROCK Lithostrat_line_Inf Lithostrat line, inferred No No No No

105553 MULTI_AREA Base_of_lava_flow+BedRock Base of lava flow coincident with Bedrock Geology boundary

No No No No

105554 BEDROCK Base_of_lava_flow Base of lava flow No No No No

105555 BEDROCK Igneous_cutting_margin_Obs Margin of one igneous rock cutting another, observed, crossmarks on side of younger rock

No No No No

105556 BEDROCK Igneous_cutting_margin_Inf Margin of one igneous rock cutting another, No No No No

15



Artificial_topology


inferred, crossmarks on side of younger rock

105601 BEDROCK BedRock_Geology_boundary_Obs BedRock Geology boundary, observed Yes No No No

105602 BEDROCK BedRock_Geology_boundary_Inf BedRock Geology boundary, inferred Yes No No No

105610 BEDROCK BedRock_Faulted_Obs Copy of faults that may be used for processing Yes No No No

105611 BEDROCK BedRock_Faulted_Inf Copy of faults that may be used for processing Yes No No No

105612 BEDROCK BedRock_polygon_closure BedRock line closing polygons where no line shown on map

Yes No No No

105620 BEDROCK BedRock_Geology_seed BedRock polygon centroid Yes No No No

105622 BEDROCK BedRock_Geology_polygon BedRock polygon derived from lines and centroids

No No No No

105650 BEDROCK BedRock_Sub-Triassic_boundary BedRock Sub-Triassic boundary No No No No

105651 BEDROCK Dyke_linear_Underground Underground position of dyke No No No No

105652 BEDROCK BedRock_Underground_boundary Underground position of geology boundary No No No No

105701 ROCK Coal_Obs Coal seam, observed No No No No

105702 ROCK Coal_Inf Coal seam, inferred No No No No

105703 ROCK Ironstone_Obs Ironstone bed, observed No No No No

105704 ROCK Ironstone_Inf Ironstone bed, inferred No No No No

105705 ROCK Tonstein Tonstein bed No No No No

105706 ROCK Incrop_of_Coal Underground coal seam, at unconformity No No No No

105707 ROCK Washout_in_seam Coal seam, washout No No No No

105708 ROCK Sub-Triassic_Coal Underground coal seam, at sub-Triassic unconformity

No No No No

105709 ROCK Cementstone Cementstone bed No No No No

105710 ROCK Oil_shale_Obs Oil-shale bed, observed No No No No

105711 ROCK Oil_shale_Inf Oil-shale bed, inferred No No No No

105712 ROCK Sandstone_band Sandstone bed No No No No

105713 ROCK Limestone_nodule_bed Limestone nodule bed No No No No

105714 ROCK Gypsum_bed Gypsum bed No No No No

105715 ROCK Coal_Obs_unpublished Coal seam, observed; published No No No No

105716 ROCK Coal_Inf_unpublished Coal seam, inferred; unpublished No No No No

105717 ROCK Sub-Permian_Coal Underground coal seam, at sub-Permian unconformity

No No No No

105801 SUPERFICIAL Superficial_Geology_boundary Superficial Geology boundary No Yes No No

105804 SUPERFICIAL Superficial_polygon_closure Superficial line closing polygons where no line shown on map

No Yes No No

105807 SUPERFICIAL Superficial_underground_cross_measures Superficial underground cross measures No Yes No No

105820 SUPERFICIAL Superficial_Geology_seed Superficial polygon centroid No Yes No No

105822 SUPERFICIAL Superficial_Geology_polygon Superficial polygon derived from lines and centroids

No No No No

105841 LANDFORM Margin_of_erratic_individual_Inf Inferred margin of individual glacial erratic or raft when partially concealed

No No No No

105842 LANDFORM Margin_of_erratic_individual Margin of individual glacial erratic or raft at surface

No No No No

105843 LANDFORM Margin_of_erratic_train Margin of glacial erratic (boulder) train No No No No

105844 LANDFORM Linear_positive_feature Linear positive feature, no genesis implied No No No No

105845 LANDFORM Linear_negative_feature Linear negative feature, no genesis implied No No No No

16



Artificial_topology


105846 LANDFORM Marked_convex_break_of_slope Marked convex break in slope, triangles denote downhill side

No No No No

105847 LANDFORM Cliffline_quarry Cliffline, quarry; crossmarks on worked side No No No No

105848 LANDFORM Cliffline_buried Cliffline, buried position; crossmarks on beach side

No No No No

105849 LANDFORM Ice_marg_Glacial_meltwater_channel_right_humped_profile Ice mariginal glacial meltwater channel, centre line branch

No No No No

105850 LANDFORM Ice_marg_Glacial_meltwater_channel_left_humped_profile Ice mariginal glacial meltwater channel, centre line branch

No No No No

105851 LANDFORM Ice_marg_Glacial_meltwater_channel_branch Ice mariginal glacial meltwater channel, centre line branch

No No No No

105852 LANDFORM Ice_contact_slope Ice contact slope No No No No

105853 LANDFORM Areal_Landform Feature line showing areal landform No No No No

105854 LANDFORM Erratic Line around a large erratic No No No No

105855 LANDFORM Backfeature_Former_coast Backfeature marking former coastline, arrowheads denote uphill side

No No No No

105856 LANDFORM Backfeature_Lake_margin Backfeature marking former lake margin, arrowheads denote uphill side

No No No No

105857 LANDFORM Backfeature_River_terrace Backfeature of terrace margin, arrowheads denote uphill side

No No No No

105858 LANDFORM Buried_channel_Centre Buried channel or valley centre No No No No

105859 LANDFORM Buried_channel_Margin Buried channel or valley margin No No No No

105860 LANDFORM Drumlin_Crestline Crestline of drumlin No No No No

105861 LANDFORM Dune_Crestline Crestline of dune No No No No

105862 LANDFORM Elongate_mound_Crestline Crestline of elongate mound No No No No

105863 LANDFORM Esker_Crestline Crestline of esker No No No No

105864 LANDFORM Linear_feature_Crestline Crestline of linear feature No No No No

105865 LANDFORM Superficial_filled_hollow Hollow filled with Superficial Deposits No No No No

105866 LANDFORM Drumlin_Line_at_base Drumlin, form-line at base of mound No No No No

105867 LANDFORM Dune_Line_at_base Dune, form-line at base of mound No No No No

105868 LANDFORM Esker_Line_at_base Esker, form-line at base of mound No No No No

105869 LANDFORM Glacial_meltwater_channel_Centre_undiff Glacial meltwater channel, undifferenciated, centre line

No No No No

105870 LANDFORM Glacial_meltwater_channel_Margin Glacial meltwater channel margins No No No No

105871 LANDFORM Kettle_hole Kettle hole; closed hollow No No No No

105872 LANDFORM Marked_concave_break_of_slope Marked concave break of slope, arrowheads denote uphill side

No No No No

105873 LANDFORM Roche_moutonee Roche moutonee, form-line at base of mound No No No No

105874 LANDFORM Cliffline_natural Cliffline, former position; crossmarks on beach side

No No No No

105875 LANDFORM Thrust_in_Superficial Thrust fault in Superficial Deposts No No No No

105876 LANDFORM Glacial_meltwater_channel_Centre_branch Glacial meltwater channel, centre line branch No No No No

105877 LANDFORM Axis_of_large_scale_glacial_flute Axis of large-scale glacial flute No No No No

105878 LANDFORM Axis_of_large_scale_glacial_gouge Axis of large-scale glacial gouge No No No No

105879 LANDFORM Small_fluted_deposit_alignment Small fluted deposit, aligned in direction of ice-movement

No No No No

105880 LANDFORM Outer_edge_of_terrace Small fluted deposit, aligned in direction of ice-movement

No No No No

17



Artificial_topology


105881 LANDFORM Air-photo_lineament Air-photo lineament No No No No

105882 LANDFORM Form_line Form line No No No No

105883 LANDFORM Glacial_meltwater_channel_Centre_head Glacial meltwater channel, centre line head No No No No

105884 LANDFORM Ice_marg_Glacial_meltwater_channel_right Ice mariginal glacial meltwater channel, single side right

No No No No

105885 LANDFORM Ice_marg_Glacial_meltwater_channel_left Ice mariginal glacial meltwater channel, single side left

No No No No

105886 LANDFORM Glacial_overflow_channel_Centre Glacial overflow channel centre line No No No No

105887 LANDFORM Glacial_overflow_channel_Centre_head Glacial overflow channel centre line head No No No No

105888 LANDFORM Glacial_overflow_channel_Centre_branch Glacial overflow channel centre line branch No No No No

105889 LANDFORM Limit_Ice_Inf_Devensian Limit of ice inferred, Devensian No No No No

105890 LANDFORM Limit_Ice_Conj_Devensian Limit of ice conjectural, Devensian No No No No

105891 LANDFORM Limit_Ice_Inf_Mid_Pleistocene Limit of ice inferred, Mid Pleistocene No No No No

105892 LANDFORM Limit_Ice_Conj_Mid_Pleistocene Limit of ice conjectural, Mid Pleistocene No No No No

105893 LANDFORM Ice_marg_Glacial_meltwater_channel_right_head Ice mariginal glacial meltwater channel, single sided right, head only

No No No No

105894 LANDFORM Ice_marg_Glacial_meltwater_channel_left_head Ice mariginal glacial meltwater channel, single sided left, head only

No No No No

105895 LANDFORM Crag_and_tail Crag and tail No No No No

105896 LANDFORM Sea_bank Sea bank No No No No

105897 LANDFORM Sub-Glacial_meltwater_channel_Centre Sub-glacial meltwater channel, centre line No No No No

105898 LANDFORM Sub-Glacial_meltwater_channel_Centre_humped_profile Sub-glacial meltwater channel, centre, humped profile

No No No No

105899 LANDFORM Palaeochannel Palaeochannel, centre line (within terrace or fan)

No No No No

105901 ARTIFICIAL Artificial_Geology_boundary Artificial Geology boundary No No Yes No

105903 ARTIFICIAL Artificial_polygon_closure Artificial line closing polygons where no line shown on map

No No Yes No

105904 ARTIFICIAL Small_quarry_or_pit Small quarry or pit No No No No

105920 ARTIFICIAL Artificial_Geology_seed Artificial polygon centroid No No Yes No

105922 ARTIFICIAL Artificial_Geology_polygon Artificial polygon derived from lines and centroids

No No No No

105951 MASS_MOVEMENT Mass_Move_Geology_boundary Mass movement Geology boundary No No No Yes

105953 MASS_MOVEMENT Mass_Move_polygon_closure Mass movement line closing polygons where no line shown on map

No No No Yes

105970 MASS_MOVEMENT Mass_Move_Geology_seed Mass movement polygon centroid No No No Yes

105972 MASS_MOVEMENT Mass_Move_Geology_polygon Mass movement polygon derived from lines and centroids

No No No No

106002 WATER_POLITICAL 10k_Limit_geology_survey 10k Limit of terestrial geology, contemporary with the geological survey

Yes Yes Yes Yes

106018 WATER_POLITICAL 10k_Estuary_closure 10k Estuary closure used where begins to narrow

Yes Yes Yes Yes

106019 MULTI_AREA Universal_Map_boundary Universal map boundary used to contain blocks of data

Yes Yes Yes Yes

106051 GVS Hidden_Colour Polygon boundary but no line in GVS No No No No

106052 GVS 0.10mm_Non_polygon Thin line in GVS No No No No

106053 GVS 0.10mm_Non_polygon_Peck Thin pecked line in GVS No No No No

106054 GVS 0.10mm_polygon Polygon boundary and thin line in GVS No No No No

18



Artificial_topology


106055 GVS 0.10mm_polygon_Peck Polygon boundary and thin pecked line in GVS No No No No

106060 GVS 0.20mm_Non_polygon Medium line in GVS No No No No

106061 GVS 0.20mm_Non_polygon_Pec Medium pecked line in GVS No No No No

106062 GVS 0.20mm_polygon Polygon boundary and medium line in GVS No No No No

106063 GVS 0.20mm_polygon_Peck Polygon boundary and medium pecked line in GVS

No No No No

106072 GVS 0.35mm_Non_polygon Thick line in GVS No No No No

106073 GVS 0.35mm_Non_polygon_Peck Thick pecked line in GVS No No No No

106074 GVS 0.35mm_polygon Polygon boundary and thick line in GVS No No No No

106075 GVS 0.35mm_polygon_Peck Polygon boundary and pecked line in GVS No No No No

106201 MULTI_LINEAR Marine+BedRock Fossil horizon, marine band coicident with BedRock Geology boundary

Yes No No No

106202 MULTI_LINEAR Coal_Inf+BedRock Coal seam, inferred coicident with BedRock Geology boundary

Yes No No No

106203 MULTI_AREA Superficial+Artif Superficial Geology boundary coincident with Artificial Geology boundary

No Yes Yes No

106204 MULTI_AREA Superficial+Mass Superficial Geology boundary coincident with Mass movement Geology boundary

No Yes No Yes

106205 MULTI_LINEAR Coal_Inf+Artif Coal seam, inferred coicident with Artificial Geology boundary

No No Yes No

106206 MULTI_LINEAR Coal_Obs+Artif Coal seam, observed coicident with Artificial Geology boundary

No No Yes No

106207 MULTI_AREA BedRock_Obs+Superficial BedRock Geology boundary Obs coincident with Superficial Geology boundary

Yes Yes No No

106208 MULTI_AREA BedRock_Inf+Superficial BedRock Geology boundary Inf coincident with Superficial Geology boundary

Yes Yes No No

106209 MULTI_LINEAR Coal_Obs+BedRock Coal seam, observed coicident with BedRock Geology boundary

Yes No No No

106210 MULTI_AREA Coal_Washout+BedRock Coal_Washout coincident with BedRock Geology boundary

Yes No No No

106211 MULTI_AREA BedRock_Inf+Artif BedRock Geology boundary Inf coincident with Artificial Geology boundary

Yes No Yes No

106212 MULTI_AREA BedRock_Inf+Mass BedRock Geology boundary Inf coincident with Mass movement Geology boundary

Yes No No Yes

106213 MULTI_AREA Artif+Mass Artificial Geology boundary coincident with Mass movement Geology boundary

No No Yes Yes

106214 MULTI_LINEAR Mineral_vein_Obs+BedRock Mineral vein, inferred coincident with Bedrock Geology boundary

Yes No No No

106215 MULTI_LINEAR Mineral_vein_Inf+BedRock Mineral vein, inferred coincident with Bedrock Geology boundary

Yes No No No

106301 MULTI_LINEAR Coal_Obs+Superficial+Artif Coal seam, observed coicident with both Superficial Geology boundary and Artificial Geology boundary

No Yes Yes No

106302 MULTI_LINEAR Coal_Inf+Superficial+Artif Coal seam, inferred coicident with both Superficial Geology boundary and Artificial Geology boundary

No Yes Yes No

106303 MULTI_AREA BedRock_Inf+Superficial+Artif BedRock Geology boundary Inf coincident with both Superficial Geology boundary and Artificial Geology boundary

Yes Yes Yes No

106304 MULTI_AREA BedRock_Inf+Superficial+Mass BedRock Geology boundary Inf coincident with both Superficial Geology boundary and Mass movement Geology boundary

Yes Yes No Yes

106305 MULTI_LINEAR Coal_Obs+BedRock+Artif Coal seam, observed coicident with both BedRock Geology boundary and Artificial Geology boundary

Yes No Yes No

19



Artificial_topology


106306 MULTI_LINEAR Coal_Inf+BedRock+Artif Coal seam, inferred coicident with both BedRock Geology boundary and Artificial Geology boundary

Yes No No No

106401 MULTI_LINEAR Coal_Obs+BedRock+Superficial+Artif Coal seam, observed coicident with BedRock Geology boundary and Superficial Geology boundary and Artificial Geology boundary

Yes Yes Yes No

106402 MULTI_LINEAR Coal_Inf+BedRock+Superficial+Artif Coal seam, inferred coicident with BedRock Geology boundary and Superficial Geology boundary and Artificial Geology boundary

Yes Yes Yes No

106403 MULTI_LINEAR Coal_Inf+BedRock+Superficial Coal seam, inferred coicident with both BedRock Geology boundary and Superficial Geology boundary

Yes Yes No No

106404 MULTI_AREA BedRock_Obs+Artif BedRock Geology boundary Obs coincident with Artificial Geology boundary

Yes No Yes No

106405 MULTI_AREA BedRock_Inf+Artif+Mass BedRock Geology boundary Inf coincident with both Artificial Geology boundary and Mass movement Geology boundary

Yes No Yes Yes

106406 MULTI_AREA Superficial+Artif+Mass Superficial Geology boundary coincident with both Artificial Geology boundary and Mass movement Geology boundary

No Yes Yes Yes

106407 MULTI_AREA Superficial+Backfeature_Former_coast Superficial Geology boundary coincident with Backfeature_Former_coast

No Yes No No

106408 MULTI_AREA Superficial+Backfeature_River_terrace Superficial Geology boundary coincident with Backfeature_River_terrace

No Yes No No

106501 ALTERATION_AREA

Limit_Metamorphic_Aureole Metamorphic aureole, + towards intrusion No No No No


Limit_Migmatisation Limit of migmatisation; symbol towards migmatites

No No No No


Limit_Hydrothermal_Alteration Hydrothermal No No No No


Limit_Area_of_Reddening Limit of area of reddening No No No No


Limit_Dolomitisation Limit of dolomitisation No No No No


Limit_Pegmatite Limit of transgressive pegmatite veins; symbol within area of veining

No No No No


Limit_Granite_vein Limit of granite vein complex; symbol within area of veining

No No No No


Limit_Gran_Peg_vein Limit of granite / pegmatite vein complex; symbol within area of veining

No No No No


Limit_Diorite_Granodiorite Limit of diorite / grandiorite vein complex; symbol within area of veining

No No No No


Limit_Metamorphic_zone_CD Limit of metamorphic zone, cordiertite No No No No


Limit_Metamorphic_zone_AL Limit of metamorphic zone, andalusite No No No No


Limit_Metamorphic_zone_CL Limit of metamorphic zone, chlorite No No No No


Limit_Metamorphic_zone_SI Limit of metamorphic zone, sillimanite No No No No


Limit_Metamorphic_zone_AS_and_K Limit of metamorphic zone, aluminium silicate and potash feldspar

No No No No

digitisation of large scale geological map data … · 2008-10-23 · all geological lines are...

Documents