Preliminary Integrated Geologic Map Databases for the United States: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, Rhode Island, Vermont
Preliminary Integrated Geologic Map Databases for the United States: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, Rhode Island, Vermont
Edition: version 1.0
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: U.S. Geological Survey Open-File Report
These metadata are specifically for the State of Maine, one state in the national compilation of state geologic map databases. The digital geologic state map data of Maine was prepared by the Maine Geological Survey in cooperation with the USGS between 1987-1994. Subsequent editing of the spatial data by the USGS was limited to fitting a standardized state boundary to the data, standardizing the arc coding, reprojecting the data, and minor edits of arc or polygon attributes to conform with the paper map.
This open-file report is one of several that present the preliminary results of the USGS Mineral Resources Program activity to compile a national-scale geologic map database to support national and regional level projects, including mineral resource and geoenvironmental assessments. The only comprehensive sources of regional- and national-scale geologic maps are state geologic maps with scales ranging from 1:100,000 to 1:1,000,000. Digital versions of these state maps form the core of what is presented here. Because no adequate geologic map exists for the state of Alaska, it is being compiled in regional blocks that also form part of this national database. It is expected that this series will completed by approximately the end of 2007. These maps and databases are being released in blocks of states or, in the case of Alaska, as compiled blocks of 1:250,000-scale quadrangles as chapters in this series. For Alaska, formal maps as well as databases are being published here, whereas for the conterminous U.S. only state databases and preview graphics are presented, because published maps for most states already exist. For Alaska these regional compilations will form the base for compiling a new geologic map of the state. As documented in CONUSdocumentationNENJ.pdf, standards for the conterminous U.S. are somewhat different than those for Alaska and Hawaii.
Purpose:
A primary goal of this work is to develop geologic map datasets with standardized structure and attribution. The database design and standards are documented in CONUSdocumentationNENJ.pdf of this series. The intent is that contiguous databases can be merged seamlessly and without any additional effort. In addition to a common database structure, the conterminous U.S. state databases (the contiguous 48 states) have been fitted to a set of standard state boundaries so that, when states are merged, they match without slivers or overlap. No attempt has been made to reconcile differences in mapping across state boundaries.
Supplemental_Information:
This database consists of up to five major Arc/Info GIS datasets for each state;
- one: geologic map with formations,
- two: faults (where present),
- three: dikes (where present),
- four: miscellaneous line features (where present),
- five: miscellaneous point features (where present).
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2006
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: none planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -71.084768
East_Bounding_Coordinate: -66.743337
North_Bounding_Coordinate: 47.895758
South_Bounding_Coordinate: 42.895758
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: geology
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: USA
Place_Keyword: Maine
Theme:
Theme_Keyword_Thesaurus: National Geologic Map Database Catalog themes, augmented
Theme_Keyword: 3100 - Vector
Theme_Keyword: 3110 - ESRI
Theme_Keyword: 3112 - export
Theme_Keyword: 1100 - Geology
Theme_Keyword: 1101 - General
Place:
Place_Keyword_Thesaurus: Augmented FIPS 10-4 and FIPS 6-4, version 1.0
Place_Keyword: US23 = Maine
Access_Constraints: none
Use_Constraints:
This database is not meant to be used or displayed at any scale other
than 1:500,000.
Any hardcopies utilizing these data sets shall clearly indicate
their source. If the licensee has modified the data in any way
they are obligated to describe the types of modifications they
have performed on the hardcopy map. Licensee specifically agrees
not to misrepresent these data sets, nor to imply that changes they
made were approved by the U.S. Geological Survey.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Suzanne W. Nicholson
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing and physical address
Address: 12201 Sunrise Valley Dr. MS954
City: Reston
State_or_Province: VA
Postal_Code: 20192
Country: USA
Contact_Voice_Telephone: 703-648-6344
Contact_Electronic_Mail_Address:swnich@usgs.gov
Data_Set_Credit:
State Geologic Map Compilation (SGMC) activity of the National Surveys and Analysis
projects of the US Geological Survey Mineral Resources Program.
Native_Data_Set_Environment: ARC/INFO version 8.3 and 9.1
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The values of the attributes ROCKTYPE1 and ROCKTYPE2 were assigned based on the information in the legends of the source maps (most of which are paper). The definitions of these values are described in the draft document Geologic Map Classification version 6.1 (Johnson and others); available at the following website: <http://geology.usgs.gov/dm>
Logical_Consistency_Report:
All internal polygons were checked for closure with vendor software and on hard copy plots. Overshoots and undershoots have been deleted or corrected as appropriate.
Completeness_Report:
Bodies of water are classified as water, and the geologic units underlying them are not included in this coverage.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Accuracy of Maine state boundary and those arcs intersecting it: The accuracy of the state boundary arcs is based on the 1:100,000 scale original data used to produce this boundary. (Johnson, Bruce R. and Leveritch, Beth, 1998, 1:100,000 Scale State Boundaries of the Conterminous United States: U.S. Geological Survey, unpublished (see metadata file: st100kmeta.txt, CONUSdocumentationNENJ.pdf))
Those internal arcs intersecting the state boundary were extended or shortened as needed to complete polygons, possibly creating a small amount of error.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Maine Geological Survey (MGS)
Publication_Date: 19950101
Title: bedrock
Geospatial_Data_Presentation_Form: digital map
Publication_Information:
Publication_Place: Augusta, Maine
Publisher: Maine Office of Geographic Information Systems
Source of lithologic codes and specific rock names found in ROCKTYPE1 and ROCKTYPE2.
Process_Step:
Process_Description:
The purpose of this standardization is to allow all SGMC covers to be seamlessly joined without any additional effort to form regional or national level digital maps. Note that for Alaska, the state is being compiled as blocks of 1:250k quadrangles that will ultimately be used to compile a new state map. Douglas Stoeser (USGS) and Ric Wilson (USGS) are co-coordinators for the overall SGMC effort, with Stoeser coordinating work on the mainland states and Wilson coordinating work for Alaska and Hawaii.
Process_Date: 2003 - 2006
Process_Step:
Process_Description:
C.L. Dicken obtained the digital geologic map of Maine from the Maine GIS Data Catalog (<http://apollo.ogis.state.me.us/catalog/>).
First step was to convert from a shapefile to a coverage. This was done in Arc/Info by using the shapearc command. Then the labels had to be attached to the polygons so the GET function was used in Arc/Info.
The coverage was re-projected into the following:
projection: Lambert Conformal Conic
units: meters
datum: NAD27
standard parallel 1: 33 0 0.000
standard parallel 2: 45 0 0.000
central meridian: -100 0 0.000
reference latitude: 0 0 0.000
false easting: 0.00000
false northing: 0.00000
(Note: Attributes associated with the generation of the coverages were not deleted.
PAT - shape, area, perimeter, coverage#, and coverage-id
AAT - shape, fnode#, tnode#, lnode#, rnode#, length, coverage#, and coverage-id)
All attributes were deleted except unit.
The values from unit where then calculated into a new field called orig_label.
Process_Date: 2006
Process_Step:
Process_Description:
The relevant state outline (arcs) was removed from the coverage and replaced with the arcs from the 1:100,000 Scale State Boundaries of the Conterminous United States.
This allows for a seamless fit of each state to a standard state boundary base.
Process_Date: 2006
Process_Step:
Process_Description:
The following attributes were exported from Filemaker as a .dbf:
orig_label, map_symbol2, unit_link, reference_id, unit_age, rocktype1, and rocktype2.
orig_label reflects the original map symbol used on the source map
map_symbol2 reflects map-symbol1 with the addition of a province number
unit_link is an auto generated field based on map-symbol2 and the state abbreviation (e.g. ME001) that produces a unique identifier for each map unit
reference_id was populated with an alphanumeric code (e.g. US001) that designates the source used for the linework and other references used to describe the age or lithologies of the unit.
unit_age was populated with general age assignment
rocktype1 records dominant lithology (does not imply minimum percentage of abundance), using standardized data dictionary
rocktype2 records second most dominant lithology, using standardized data dictionary
The attributes were then converted using the following structure:
item name: orig_label
width: 12
output: 12
type: c
item name: sgmc_label
width: 16
output: 16
type: c
item name: unit_link
width: 18
output: 18
type: c
item name: source
width: 6
output: 8
type: c
item name: unit_age
width: 60
output: 60
type: c
item name: rocktype1
width: 40
output: 40
type: c
item name: rocktype2
width: 40
output: 40
type: c
Process_Date: 2005
Process_Step:
Process_Description:
Once the .dbf was in the correct format with standardized column widths and data structure, it was converted into a lookup table (.lut) in Arc/Info. Then a joinitem was performed to join the look-up table to the polygon attribute table. orig_label was used as the merge item.
Process_Date: 2006
Process_Step:
Process_Description:
Next, in preparing the uniform .aat file, the following items were added to the table:
item name: arc-code
width: 3
output: 3
type: i
item name: arc-para1
width: 3
output: 3
type: i
item name: arc-para2
width: 3
output: 3
type: i
item name: source
width: 6
output: 8
type: c
Process_Date: 2006
Process_Step:
Process_Description:
Arc-code was populated using the paper map source to tag the lines using the AAT line type data dictionary (see CONUSdocumentationNENJ.pdf in this series).
Arc-para1 was populated when additional information was available such as identifying the upthrown side of a fault or direction of thrusting on a fault. (see CONUSdocumentationNENJ.pdf)
Arc-para2 is a scratch field that is used mostly in Alaska.
Source was populated with an alphanumeric code (e.g. US001) that designates the source used for the linework.
Process_Date: 2006
Process_Step:
Process_Description:
Once the .aat and the .pat were populated with the correct attributes, the coverage was exported as an .e00 file (MEgeol_lcc.e00).
Then it was unprojected into geographic coordinates and exported again (MEgeol_dd.e00).
Process_Date: 2006
Process_Step:
Process_Description:
Faults were extracted from the coverage and created a separate fault coverage (MEfaults_lcc) and then exported (MEfaults_lcc.e00).
Process_Date: 2006
Process_Step:
Process_Description:
Finally, the geology lines, geology polygons and faults were converted into shapefiles; in both geographic coordinates and in Lambert Conformal Conic projection.
Enumerated_Domain_Value_Definition: Silurian West Branch Volcanic Rocks
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Swl;0
Enumerated_Domain_Value_Definition: Silurian Waterville Formation limestone member
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: SZ9c;0
Enumerated_Domain_Value_Definition: Silurian - Precambrian Z ultramafic rocks
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: SZb;0
Enumerated_Domain_Value_Definition: Silurian - Precambrian Z Berwick Formation
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: SZe;0
Enumerated_Domain_Value_Definition: Silurian - Precambrian Z Eliot Formation
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: SZk;0
Enumerated_Domain_Value_Definition: Silurian - Precambrian Z Kittery Formation
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: water;0
Enumerated_Domain_Value_Definition: Water
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Zcb;0
Enumerated_Domain_Value_Definition: Precambrian Z Coombs Limestone
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Zi;0
Enumerated_Domain_Value_Definition: Precambrian Z rocks of Islesboro
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Zil;0
Enumerated_Domain_Value_Definition: Precambrian Z rocks of Islesboro limestone
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Znh;0
Enumerated_Domain_Value_Definition: Precambrian Z North Haven Formation
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Zop;0
Enumerated_Domain_Value_Definition: Precambrian Z Ogier Point Formation
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Zr;0
Enumerated_Domain_Value_Definition: Precambrian Z Rye Formation
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Zrk;0
Enumerated_Domain_Value_Definition: Precambrian Z Rockport Formation
Attribute:
Attribute_Label: unit_link
Attribute_Definition:
composite map label = ST + sgmc_label
This creates a unique identifier for every unit in the CONUS (continental United States) covers.
type: character
width: 18
output width: 18
Enumerated_Domain_Value_Definition: Silurian West Branch Volcanic Rocks
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: MESwl;0
Enumerated_Domain_Value_Definition: Silurian Waterville Formation limestone member
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: MESZ9c;0
Enumerated_Domain_Value_Definition: Silurian - Precambrian Z ultramafic rocks
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: MESZb;0
Enumerated_Domain_Value_Definition: Silurian - Precambrian Z Berwick Formation
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: MESZe;0
Enumerated_Domain_Value_Definition: Silurian - Precambrian Z Eliot Formation
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: MESZk;0
Enumerated_Domain_Value_Definition: Silurian - Precambrian Z Kittery Formation
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: MEwater;0
Enumerated_Domain_Value_Definition: Water
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: MEZcb;0
Enumerated_Domain_Value_Definition: Precambrian Z Coombs Limestone
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: MEZi;0
Enumerated_Domain_Value_Definition: Precambrian Z rocks of Islesboro
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: MEZil;0
Enumerated_Domain_Value_Definition: Precambrian Z rocks of Islesboro limestone
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: MEZnh;0
Enumerated_Domain_Value_Definition: Precambrian Z North Haven Formation
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: MEZop;0
Enumerated_Domain_Value_Definition: Precambrian Z Ogier Point Formation
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: MEZr;0
Enumerated_Domain_Value_Definition: Precambrian Z Rye Formation
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: MEZrk;0
Enumerated_Domain_Value_Definition: Precambrian Z Rockport Formation
Attribute:
Attribute_Label: source
Attribute_Definition:
An alphanumeric code (e.g. US001) that designates the source material used.
type: character
width: 6
output width: 8
Attribute_Definition_Source: Doug Stoeser (USGS)
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: ME001
Enumerated_Domain_Value_Definition:
Maine Geological Survey (MGS), 1995, bedrock, Augusta, Maine, Maine Office of Geographic Information Systems, scale 1:500,000.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: US001
Enumerated_Domain_Value_Definition:
Johnson, Bruce R. and Leveritch, Beth, 1998, 1:100,000 Scale State Boundaries of the Conterminous United States: U.S. Geological Survey, unpublished (see metadata file: st100kmeta.txt, CONUSdocumentationNENJ.pdf)
Attribute:
Attribute_Label: unit_age
Attribute_Definition:
The geologic age from the source map used.
type: character
width: 60
output width: 60
An alphanumeric code (e.g. US001) that designates the source material used.
type: character
width: 6
output width: 8
Attribute_Definition_Source: Doug Stoeser (USGS)
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: ME001
Enumerated_Domain_Value_Definition:
Digital bedrock data downloaded from Maine Office of GIS in September 2005 from <http://apollo.ogis.state.me.us/catalog/catalog.asp?state=2&extent=cover#bedrock>
Bedrock units table (publication date 11/15/2002) downloaded from same site.
Permission to redistribute these data granted by Dr. Robert Marvinney, State Geologist of Maine, in September 2006.
Enumerated_Domain_Value_Definition: C.L. Dicken flipped arcs and corrected mistagged arcs.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: US001
Enumerated_Domain_Value_Definition:
Johnson, Bruce R. and Leveritch, Beth, 1998, 1:100,000 Scale State Boundaries of the Conterminous United States: U.S. Geological Survey, unpublished (see metadata file: st100kmeta.txt, CONUSdocumentationNENJ.pdf)
Overview_Description:
Entity_and_Attribute_Overview:
Coding for polygon attributes:
NAME: FEATURE:
orig_label unmodified map unit symbols from source cover
sgmc_label orig_label modified for standard geologic age symbols and an
integer code added for province
unit_link sgmc_label and a state code identifier
source reference to source of data
unit_age geologic age
rocktype1 predominant lithology
rocktype2 second most predominant lithology
Coding for arc attributes:
NAME: FEATURE:
arc-code unique integer identifier
arc-para1 used where additional information is needed
arc-para2 scratch field
source reference to source of data
Coding for point attributes:
NAME: FEATURE:
point_feature name of feature on map
source reference to source of data
Coding for dikes (special arcs) attributes:
NAME: FEATURE:
orig_label unmodified map unit symbols from source cover
sgmc_label orig_label modified for standard geologic age symbols and an
integer code added for province
arc-code unique integer identifier
dike_lith general lithology
dike_age geologic age
source reference to source of data
Entity_and_Attribute_Detail_Citation: ESRI
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
U.S. Geological Survey Information Services
Reston-ESIC
Any use of trade, product, or firm names is for
descriptive purposes only and does not imply endorsement by the USGS.
Although these data have been used by the USGS and have been successfully
imported into data base programs, no warranty, expressed or implied, is made
by the USGS as to how successfully or accurately the data can be imported into
any specific application software running on any specific hardware platform.
The fact of distribution shall not constitute any such warranty, and no
responsibility is assumed by the USGS in connection therewith.
This data base GIS is not meant to be used or displayed at any scale other than 1:500,000.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARC/INFO export
Format_Version_Number: 9.0
Format_Information_Content: Geologic units and structural features