Geological Map of Canada (1860A) |
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Geological Map of Canada - Map 1860A GIS database structure
GIS database structure
Cartographic projection
All of the spatial data in the Arc/Info coverages, and in the *.E00 and
*.SHP files is stored in the same projection described by the following
set of projection parameters:
Geological Map of Canada projection parameters
Parameter |
Value |
Type |
Lambert Conformal Conic projection |
Datum |
North American Datum 1927 (NAD27) |
Units |
metres |
Spheroid |
Clarke, 1866 |
Lambert standard parallels |
49 00 00 N
77 00 00 N |
Projection origin |
95 00 00 W (central meridian)
49 00 00 N
|
False origin |
(easting, northing)=(0, 0) |
The \CANADA\SHPGEO\... *.SHP files contain geographic (longitude, latitude)
co-ordinates.
Data sets
The following tables describe the database fields which appear in the
Arc/Info workspaces, *.E00 files and .DBF files which accompany the *.SHP
files.
The codes used for directory and file names correspond to either
the compilation block (ARC, SUP, etc.)
and/or data type (ROX, RIV, BND, etc.).
Geological data sets
ROX<area>: geology (polygons and linework)
Geological unit areas are defined as polygons and geological contacts are
defined as lines. The following items are attached to each polygon:
Database fields for ROX polygons
Field |
Description |
SYMBOL |
symbol number |
COMP |
compiler's name |
English |
UNIT |
unit code |
DOMAIN |
onshore/offshore/ice |
COUNTRY |
country |
ERA |
age at the era level |
PERIOD |
age at the period level |
EPOCH |
age at the epoch or period level |
REWORKAG |
age of reworking/intense metamorphism |
RXTP |
general rock category |
SUBRXTP |
specific rock category if applicable |
AGERXTP |
age/rock type combination for viewers |
METGRADE |
metamorphic grade |
GEOLPROV |
geological province |
NAME |
unit name |
French |
UNITE |
French equivalent of 'UNIT' field |
DOMAINE |
French equivalent of 'DOMAIN' field |
PAYS |
French equivalent of 'COUNTRY' field |
ERE |
French equivalent of 'ERA' field |
PERIODE |
French equivalent of 'PERIOD' field |
EPOQUE |
French equivalent of 'EPOCH' field |
AGETRANS |
French equivalent of 'REWORKAG' field |
TPRCH |
French equivalent of 'RXTP' field |
SUBTPRCH |
French equivalent of 'SUBRXTP' field |
AGETPRCH |
French equivalent of 'AGERXTP' field |
NIVMET |
French equivalent of 'METGRADE' field |
PROVGEOL |
French equivalent of 'GEOLPROV' field |
NOM |
French equivalent of 'NAME' field |
The following items are attached to each line:
Database fields for ROX arcs
Field |
Description |
SYMBOL |
a symbol number |
COMP |
compiler's name |
DXF-LAYER |
description code (see table below) |
English |
COUNTRY |
country |
ENGDESC |
detailed English description of line |
French |
PAYS |
French equivalent of 'COUNTRY' field |
FREDESC |
French equivalent of 'ENGDESC' field |
FLT<area>: faults (geological linework, e.g. faults, fracture zone, etc.)
Geological linework, other than geological contacts, are defined as lines,
and points are used to define markers or symbology on the lines. The
following items are attached to each line and point:
Database fields for FLT arcs
Field |
Description |
SYMBOL |
a symbol number |
COMP |
compiler's name |
DXF-LAYER |
description code (see table below) |
English |
COUNTRY |
country |
ENGDESC |
detailed English description of line |
NAME
| feature name (to be added by user) |
French |
PAYS |
French equivalent of 'COUNTRY' field |
FREDESC |
French equivalent of 'ENGDESC' field |
NOM |
French equivalent of 'NAME' field |
SYM<area>: geological symbols (e.g. impact structure, volcanic centre, etc.)
The geological symbols on this map are defined as lines and points. The
following items are attached to each line and point:
Database fields for SYM symbols
Field |
Description |
SYMBOL |
a symbol number |
COMP |
compiler's name |
DXF-LAYER |
description code (see table below) |
English |
COUNTRY |
country |
ENGDESC |
detailed English description of symbol |
NAME |
feature name (to be added by user) |
French |
PAYS |
French equivalent of 'COUNTRY' field |
FREDESC |
French equivalent of 'ENGDESC' field |
NOM |
French equivalent of 'NAME' field |
Topographic data sets
RIV<area>: line cover of all lakes and rivers that appear in each area
The topographical data are defined as lines. The following items are
attached to each line and point:
Database fields for RIV arcs
Field |
Description |
SYMBOL |
a symbol number |
DXF-LAYER |
description code (see table below) |
English |
ENGDESC |
detailed English description of line |
French |
FREDESC |
French equivalent of 'ENGDESC' field |
LAK<area>: polygons of all lakes that appear in each area
The topographical areas are defined as polygons. The following items are
attached to each polygon:
Database fields for LAK polygons
Field |
Description |
SYMBOL |
a symbol number |
DXF-LAYER |
description code (see table below) |
English |
ENGDESC |
detailed English description |
French |
FREDESC |
French equivalent of 'ENGDESC' field |
BND<area>: line cover of all political boundaries that appear in each area
The topographical data are defined as lines. The following items are
attached to each line:
Database fields for BND arcs
Field |
Description |
SYMBOL |
a symbol number |
DXF-LAYER |
description code (see table below) |
English |
ENGDESC |
detailed English description of line |
French |
FREDESC |
French equivalent of 'ENGDESC' field |
In addition, the following Canada-wide coverages of topographic data are
supplied:
BAS1860A: topographical linework and point symbols of all Canada
The topographical data are defined as lines and points. The following items
are attached to each line and point:
Database fields for BAS1860A arcs and points
Field |
Description |
SYMBOL |
a symbol number |
DXF-LAYER |
description code (see table below) |
English |
ENGDESC |
detailed English description |
NAME |
city name (in point file only) |
French |
FREDESC |
French equivalent of 'ENGDESC' field |
NOM |
French equivalent of 'NAME' field |
WAT1860A: polygons (lakes, oceans, etc.) of all Canada
The topographical areas are defined as polygons for unit areas and lines
for shoreline. The following items are attached to each line and polygon:
Database fields for WAT1860A polygons
Field |
Description |
SYMBOL |
a symbol number |
DXF-LAYER |
description code (see table below) |
English |
ENGDESC |
detailed English description |
French |
FREDESC |
French equivalent of 'ENGDESC' field |
BUF1860A: buffer polygons around islands and shoreline of all Canada
This special polygon cover is included to create a white band around all
shorelines and islands. This helps to separate the onshore geology from the
offshore. The polygons use the attribute item 'INSIDE'.
TXT1860A: topographical text of all Canada
The topographical text on this map is defined as annotation. The annotation
is stored as a subclass called 'TEXT' which uses the attribute item
'TXT-CLASS'
- NOTE:
- Covers may be exported in DXF format. Different line and symbol types will
be exported as separate AUTOCAD layers by using the 'DXF-LAYER' item.
List of DXF-LAYER codes and descriptions
The following is a list of all DXF-LAYER attributes that appear in the data
with a brief description.
Linework
Values for the DXF-LAYER field
DXF-LAYER value |
Description |
UNCLASS_FLT |
unclassified fault |
UNCLASS_FLT_OFF |
unclassified fault offshore |
THRUST_FLT |
thrust fault (teeth on upper plate) |
THRUST_FLT_OFF |
thrust fault offshore (teeth on upper plate) |
NORMAL_FLT |
normal fault (hachures on downthrown side) |
NORMAL_FLT_OFF |
normal fault offshore |
STRIKE_SLIP_FLT |
strike slip fault |
STRIKE_SLIP_OFF |
strike slip fault offshore |
SPREAD_CTR |
offshore spreading centre |
DEFORM_FRONT |
offshore deformation front |
SEAFLOOR_ISO |
seafloor isochron |
PSEUDO_FLT |
offshore pseudo fault |
FRACTURE_ZONE |
offshore fracture zone |
FLEXURE_FLT |
offshore flexure fault |
TRANSFORM_FLT |
offshore transform fault |
EXTINCT_CENTRE |
extinct spreading centre |
SED_ISOPACH |
oceanic sediment isograds (defined) |
SED-ISOPACH2 |
oceanic sediment isograds (assumed) |
CONT_OCEAN_BDRY |
continent ocean boundary (defined) |
CONT_OCEAN_BDRY2 |
continent ocean boundary (assumed) |
FACIES_BDRY |
facies boundary |
CONTACT |
geological contact |
OFF_CONTACT |
offshore geological contact (inferred) |
OTHERS |
miscellaneous lines |
EVAP_DIAPIR |
evaporite diapir |
BURIED_CONTACT |
buried contact |
BURIED_FLT |
buried fault |
IMPACT |
impact structure |
FAULT_BDRY |
fault boundary |
ICE_BDRY |
ice boundary |
Symbols
Values for the DXF-LAYER field in SYM coverages
DXF-LAYER value |
Description |
VOLCANIC_CENTER |
volcanic centre |
DIATREME |
diatreme |
KIMBERLITE |
kimberlite |
CARBONATITE |
carbonatite |
TrJ_ULTRAMAFIC |
Alaskan-type ultramafic bodies (Triassic Jurassic) |
mK_ULTRAMAFIC |
Alaskan-type ultramafic bodies (mid-Cretaceous) |
EVAP_DIAPIR |
evaporite diapir |
ACC_TERRANE |
leading edge of accreted terrane |
Base
DXF-LAYER Value |
Description |
NEATLINE |
neatline |
URBAN_BDRY |
urban boundary |
UNSURVEY_BDRY |
unsurveyed boundary |
DIST_BDRY |
district boundary |
PROV_BDRY |
provincial boundary |
INT_BDRY |
international boundary |
CITY_NAME |
city name |
SHORELINE |
shoreline |
LAKE |
lake |
RIVER |
river |
ARC_CIRCLE |
arctic circle |
BATHYMETRY |
submarine contour |
ISLAND |
island |
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