Circum-North Pacific Map (CD-ROM): 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:

**Circumpolar Map projection parameters**
Parameter	Value
Type	Lambert Azimuthal Equal-Area projection
Units	metres
Spheroid	Clarke, 1866
Projection origin	175 00 00 W (central meridian) 70 00 00 N
False origin	(easting, northing)=(0, 0)
Radius	6370997 m

The \CIRCUM\SHPGEO\... *.SHP files contain geographic (longitude, latitude) co-ordinates.

Data sets

The following tables and notes describe the database fields which appear in the Arc/Info workspaces, *.E00 files and .DBF files which accompany the *.SHP files.

Unless otherwise noted, features in *.DXF files have values from the item 'DXF-LAYER' attached to the features within the file.

Geological data sets

ROX<scale>: geology (polygons and linework) where <scale> is

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	a symbol number
UNIT	unit code
NAME	unit name
TECTONIC_E	tectonic environment or overlap assemblage
LOCATION	geographic location
ERA	age at the era level
PERIOD	age at the period level
PERIOD_EPO	age at the epoch or period level
AGE	list of ages at era, period, and epoch levels

The following items are attached to each line:

**Database fields for ROX arcs**
Field	Description
SYMBOL	a symbol number
DXF-LAYER	description code (see table below)
DESC	comment field

For the ROX<scale>.DXF files the geological units are identified as points using the value of item 'UNIT'.

FLT<scale>: faults (geological linework, faults) where <scale> is

Geological linework, other than geological contacts, is defined as lines. The following items are attached to each line:

**Database fields for FLT arcs**
Field	Description
SYMBOL	a symbol number
DXF-LAYER	description code (see table below)
DESC	comment field
NAME	feature name

GEOLOFF: ocean geology (geological linework, faults, etc)

Ocean geological linework, including geological contacts, are defined as lines and points are used to define markers and unit identifiers. The following items are attached to each line and point:

**Database fields for GEOLOFF arcs**
Field	Description
SYMBOL	a symbol number
DXF-LAYER	description code (see table below)
DESC	comment field
NAME	feature name

Deposit data sets

PLACER: placer districts symbols (polygons and linework)

Placer district areas are defined as polygons and placer district outlines are defined as lines. The following items are attached to each polygon:

**Database fields for PLACER polygons**
Field	Description
DEPOSIT_NA	district name
MAP_ROW	quadrant row number of district
MAP_COL_	quadrant column number of district
NO_IN_SECT	district number
DEPOSIT_TY	district type
COMMODITIE	district commodity
QUADNUMBER	unique district identifier made up of combined values of MAP_ROW, MAP_COL_, and NO_IN_SECT

The following items are attached to each line:

**Database fields for PLACER arcs**
Field	Description
DEPOSIT_NA	district name
DEPOSIT_TY	district type
COMMODITIE	district commoditie
QUADNUMBER	unique district identifier
DXF-LAYER	description code (see table below)

For PLACER.DXF files, the placer district areas are identified as points using the value of item 'QUADNUMBER'.

LODEDEP: mineral deposit symbols (points)

Lode mineral deposits are defined as points. The following items are attached to each point:

**Database fields for LODEDEP points**
Field	Description
SYMBOL	symbol number
DEPOSIT_NA	deposit name
LATDD	latitude (in decimal degrees)
LONGDD	longitude (in decimal degrees)
MAP_ROW	quadrant row number of deposit
MAP_COL_	quadrant column number of deposit
NO_IN_SECT	deposit number
DEPOSIT_TY	deposit type
COMMODITIE	deposit commodity
BELT_METAL	name of metallogenic belt in which deposit is located
METALLOGEN	class of metallogenic belt in which deposit is located
ABBREVNAME	metallogenic belt code
BELT_NAME1	full name of metallogenic belt in which deposit is located
BELT_NAME2	rest of full name of metallogenic belt in which deposit is located
QUADNUMBER	unique deposit identifier made up of combined values of MAP_ROW, MAP_COL_, and NO_IN_SECT
DXF-LAYER	description code (see table below)

Metallogenic belt data sets

BLT<type>: metallogenic belt symbols (polygons and linework) where <type> is

Metallogenic belt areas are defined as polygons and metallogenic belt outlines are defined as lines. The following items are attached to each polygon:

**Database fields for MBELTS polygons**
Field	Description
ABBREVNAME	metallogenic belt code
ISBELT	SurView coding

The following items are attached to each line:

**Database fields for MBELTS arcs**
Field	Description
ABBREVNAME	metallogenic belt code
DXF-LAYER	description code (see table below)

For BLT<type>.DXF files the linework is defined with item DXF-LAYER. Item ABBREVNAME which defines the identity of the metallogenic belts containes '/' characters and can not be converted. It is included as a text feature.

Because the metallogenic belt covers have one to many relationships (ie: belts overlap each other, therefore polygons may belong to more than one belt) attributes are in a separate INFO file called bltnam.dat. A 'relate' called bltnam in relate file bltnam.rel can be used to connect the metallogenic belt covers with this database. The link item is ABBREVNAME.

The following items are in the database:

**Database fields for MBELTS INFO database**
Field	Description
ABBREVNAME	metallogenic belt code
BELT_METAL	name of metallogenic belt
ERA	age at the era level
PERIOD	age at the period level
PERIOD_EPO	age at the epoch or period level
BELT_NAME1	full name of metallogenic belt
BELT_NAME2	rest of full name of metallogenic belt

Topographic data sets

HYDRO: line cover of all shoreline, lakes, and rivers

The topographical data are defined as lines. The following items are attached to each line:

**Database fields for HYDRO arcs**
Field	Description
SYMBOL	a symbol number
DXF-LAYER	description code (see table below)
DESC	comment field

W_MASK: polygons of all ocean and lakes

The topographical areas are defined as polygons. The following items are attached to each polygon:

**Database fields for W_MASK polygons**
Field	Description
SYMBOL	a symbol number
DXF-LAYER	description code (see table below)
DESC	comment field

POLIT: line cover of all political boundaries

The topographical data are defined as lines. The following items are attached to each line:

**Database fields for POLIT arcs**
Field	Description
SYMBOL	a symbol number
DXF-LAYER	description code (see table below)
DESC	comment field

BORDER: line cover of map border

The border data are defined as lines. The following items are attached to each line:

**Database fields for BORDER arcs**
Field	Description
SYMBOL	a symbol number
DXF-LAYER	description code (see table below)
DESC	comment field

LATLON: line cover of latitude/longitude grid

The topographical data are defined as lines. The following items are attached to each line:

**Database fields for LATLON arcs**
Field	Description
SYMBOL	a symbol number
DXF-LAYER	description code (see table below)
DESC	comment field

TEXT: topographical text

The topographical text on this map is defined as annotation. The annotation is stored as a subclass called 'TEXT'.

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
CONTACT	contact (depositional or intrusive contact that is not a terrane boundary. Includes marginal contacts of overlap sedimentary and volcanic assemblages, basinal deposits, and plutons)
CONTACT_UNC	uncertain contact (depositional or intrusive contact that is not a terrane boundary. Includes marginal contacts of overlap sedimentary and volcanic assemblages, basinal deposits, and plutons)
FLT_POST	postaccretion fault (major fault that formed after accretion; sense of displacement unknown)
FLT_POST_THRUST	postaccretion thrust fault (sawteeth point toward upper plate)
FLT_POST_SS_D	postaccretion strike-slip fault (arrows denote relative strike- slip displacement, dextral)
FLT_POST_SS_S	postaccretion strike-slip fault (arrows denote relative strike- slip displacement, sinistral)
FLT_POST_NORM	postaccretion normal or extension fault (barb indicates downdropped block; locally superposed on older thrust fault)
FLT_BND	fault bounding terrane or oceanic plate (sense and age of net displacement unknown)
FLT_BND_CON	fault bounding terrane or oceanic plate (concealed beneath overlap assemblages or basinal deposits. Sense and age of net displacement unknown)
FLT_BND_THR	thrust or reverse fault bounding terrane or oceanic plate (sawteeth point toward upper plate)
FLT_BND_THR_APP	thrust or reverse fault bounding terrane or oceanic plate (approximate, sawteeth point toward upper plate)
FLT_BND_THR_CON	thrust or reverse fault bounding terrane or oceanic plate (concealed beneath overlap assemblages or basinal deposits. Sawteeth point toward upper plate)
FLT_BND_SS_D	strike-slip fault bounding terrane or oceanic plate (arrows denote relative displacement, dextral)
FLT_BND_SS_S	strike-slip fault bounding terrane or oceanic plate (arrows denote relative displacement, sinistral)
FLT_BND_SS_APP	strike-slip fault bounding terrane or oceanic plate (approximate, arrows denote relative displacement)
FLT_BND_SS_CON	strike-slip fault bounding terrane or oceanic plate (concealed beneath overlap assemblages or basinal deposits. Arrows denote relative displacement)
FLT_BND_NORM	normal or extension fault bounding terrane or oceanic plate (barb indicates downdropped block; locally superposed on older thrust fault)
FLT_BND_NORM_APP	normal or extension fault bounding terrane or oceanic plate (approximate, barb indicates downdropped block; locally superposed on older thrust fault)
SPREAD_CTR	active or extinct oceanic spreading ridge
SPREAD_CTR_CON	active or extinct oceanic spreading ridge (approximately located or concealed beneath younger deposits)
MAGNETIC_LIN	selected ocean floor magnetic lineation
BASIN	minor offshore Mesozoic or Cenozoic basin (thickness greater than about 2 or 3 km)
SEAMOUNT	large seamount or oceanic plateau
FRACTUR_ZONE	oceanic fracture zone
FRACTUR_ZONE_CON	oceanic fracture zone (approximately located)
PLACER	placer district boundary
BELT_PREACC_1	pre-accretionary metallogenic belt: podiform Cr, gabbroic Ni-Cu, zoned mafic-ultramafic PGE deposits, hornblende peridotite Cu-Ni, anorthosite-hosted apatite Ti-Fe, serpentinite-hosted asbestos, and associated deposits
BELT_PREACC_2	pre-accretionary metallogenic belt: stratiform and stratibound sulfide, volcanogenic Mn and Fe bedded barite, Fe formation, carbonatite-related Na, Ta, and REE, and associated deposits
BELT_PREACC_3	pre-accretionary metallogenic belt: felsic-magmatism-related deposits
BELT_ACCRET	accretionary metallogenic belt: Au quartz vein, Cu-Ag quartz vein, and basaltic Cu deposits, and anatectic granitic- magmatism-related deposits
BELT_POSTACC	post-accretionary metallogenic belt: igneous arc-related deposits
OTHERS	miscellaneous lines

Symbols

**Values for the DXF-LAYER field in DEPOS cover**
DXF-LAYER value	Description
DEPO_MARINE	deposit related to marine felsic to mafic extrusive rocks
DEPO_EXTRUS	deposit related to subarial extrusive rocks
DEPO_STRAT_FIN	stratabound deposit in fine-grained clastic and siliceous sedimentary rocks
DEPO_STRATA	stratabound deposit in course clastic sedimentary rocks and subarial basalt
DEPO_CARBONATE	deposit in carbonate and chemical-sedimentary rocks
DEPO_VEIN	vein and replacement deposit
DEPO_ALK_VEIN	vein and replacement deposit related to calc-alkaline and alkaline intrusions
DEPO_ALK_SKARN	skarn and greisen deposit related to calc-alkaline and alkaline intrusions
DEPO_ALK_PORPH	porphyry and granitic pluton-hosted deposit related to calc- alkaline and alkaline intrusions
DEPO_MAFIC	deposit related to mafic and ultramafic rocks
DEPO_METAMORPH	deposit related to regionally metamorphosed rocks

Base

**Values for the DXF-LAYER field in base covers**
DXF-LAYER Value	Description
NEATLINE	neatline
BORDER	border
DIST_BDRY	district boundary
INT_BDRY	international boundary
SHORELINE	shoreline
LAKE	lake
ISLAND	island in lake
RIVER	river
RIVER_DBL	double line river
LAT_LONG	latitude/longitude grid
LAND	land
WATER	water

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