bedrock

Identification Information

Citation Information

Originator	Maine Department of Conservation (MEDOC), Maine Geological Survey (MGS)
Publication Date	19950101
Publication Time	Unknown
Title	bedrock
Geospatial Data Presentation Form	vector digital data
Series Name	Maine GIS
Issue Identification	SDE server; Internet Data Catalog
Publication Place	Augusta ME
Publisher	Maine Office of Geographic Information Systems
Other Citation Details	1:500000 Bedrock UNIT codes assigned to this coverage are available in comma delimited text, and .dbf format, on the MEGIS Data Catalog
Online Linkage	http://megis.maine.gov/catalog/
[smcisrcs]	500000
[smcisrcm]	online
Beginning Date	19851231
Beginning Time	Unknown
Ending Date	19941231
Ending Time	Unknown
[smcisrcc]	source dates

Abstract

BEDROCK maps bedrock geology units and major faults for Maine at 1:500,000 scale. The dataset was developed by the Maine Geological Survey (MGS) from the "Bedrock Geologic Map of Maine, Osberg, Hussey, and Boone, 1985". The data for this dataset were scanned off 1:500,000 scale mylars by the United States Geological Survey (USGS) in 1987. The original bedrock unit codes were added by the J.W. Sewall Co. in 1990 for the Maine Low-Level Radioactive Waste Authority. In 1994, staff at MGS identified and added codes for major bedrock faults. Bedrock UNIT codes assigned to this dataset are available in comma delimited text, and .dbf format, on the Maine GIS Data Catalog

Purpose

Bedrock is the digital representation of the paper map "Bedrock Geologic Map of Maine, Osberg, Hussey and Boone, 1985" and could be used for various purposes related to statewide geological studies and planning.

Time Period of Content

Beginning Date	19851231
Ending Date	19941231
Currentness Reference	source dates

Status

Progress	Complete
Maintenance and Update Frequency	None planned

Bounding Coordinates

West Bounding Coordinate	-71.00653
East Bounding Coordinate	-66.80309
North Bounding Coordinate	47.43875
South Bounding Coordinate	43.05916

Keywords

Theme	geology, fault, bedrock (Maine GIS Thesaurus-Theme)
Theme	geoscientificInformation, imageryBaseMapsEarthCover (ISO Keyword Thesaurus)
Place	Maine, United States (Maine GIS Thesaurus-Place)
Stratum	solid earth (GCMD Parameter Keyword)

Access Constraints

none

Use Constraints

Users must assume responsibility in determining the usability of this data for their purposes. Digital maps retain the accuracy of their source materials. The best use of data mapped at scales of 1:500,000 and 1:250,000 is in statewide planning and studies; at 1:100,000 in regional planning and studies; at 1:62,500 and 1:24,000 in detailed studies and local planning; and at 1:12,000 and 1:5,000 or larger scales in parcel level studies and detailed local planning. In the use of Maine GIS data, please check sources, scale, accuracy, currentness and other available information. Please confirm that you are using the correct copy of both data and metadata from the Maine GIS Data Catalog. Updates, corrections, and feedback, incorporated in the Maine GIS database are made in accordance with "Data Standards for Maine Geographic Information Systems", 2002, and coordinated by MEGIS

Contact Organization

(MEDOCMGS) Maine Department of Conservation, Maine Geological Survey

Contact Person

Director, Earth Resource Information

Address Type

mailing address

Address

22 State House Station

City

Augusta

State or Province

Postal Code

04333-0022

Country

USA

Contact Voice Telephone

207 287 2801

Data Set Credit

Credit should always be given to the data source and/or originator when the data is transferred or printed.

Native Data Set Environment

Maine Office of Information Technology (OIT) Oracle 9i, Maine Office of Geographic Information Systems (MEGIS), Maine GIS SDE, SDEUSER, SDE.DEFAULT, Maine GIS Internet Data Catalog

Citation Information

Originator	Maine Geological Survey (MGS)
Publication Date	20021115
Title	BEDROCKUNITS
Edition	2
Geospatial Data Presentation Form	tabular digital data
Series Name	Maine GIS
Issue Identification	SDE server; Internet Data Catalog; Tables
Publication Place	Augusta ME
Publisher	Maine Office of Geographic Information Systems (MEGIS)
Online Linkage	http://megis.maine.gov/catalog/

Attribute Accuracy Report

Attribute accuracy is tested by manual comparison of the source with hard copy printouts and/or symbolized display of digital files. Please report errors to Maine Office of GIS.

Completeness Report

Data set is complete.

Horizontal Positional Accuracy Report

Approximate horizontal accuracy is 254 meters, assuming source data meets National Map Accuracy Standards.

Horizontal Positional Accuracy Value

254

Horizontal Positional Accuracy Explanation

Compilation base data meets National Map Accuracy Standards for 1:500,000 scale. Horizontal positional accuracy for the digital data is tested by visual comparison to the source with hard copy plots.

Citation Information

Originator	U.S. Geological Survey (USGS)
Publication Date	19730101
Publication Time	Unknown
Title	(500kbase) USGS 1:500000 State of Maine
Edition	Base
Geospatial Data Presentation Form	map
Series Name	Small Scale Maine and Vicinity Maps
Issue Identification	Maine
Publication Place	Reston VA
Publisher	U.S. Geological Survey
Other Citation Details	State Map Series
[smcilnkh]	false
[smcisrcs]	500000
[smcisrcm]	paper
Time of Day	Unknown

Source Scale Denominator

500000

Type of Source Media

paper

Time of Day

Unknown

Source Citation Abbreviation

500kbase

Citation Information

Originator	P.H. Osberg, A.M. Hussey ll, G.M. Boone, ed.
Publication Date	19851231
Publication Time	Unknown
Title	(OSBHUSSBOONE) Bedrock Geologic Map of Maine
Geospatial Data Presentation Form	atlas
Publication Place	Augusta ME
Publisher	Maine Geological Survey
[smcisrcs]	500000
[smcisrcm]	paper
Calendar Date	19851231
Time of Day	Unknown
[smcisrcc]	publication date

Source Scale Denominator

500000

Type of Source Media

paper

Calendar Date

19851231

Time of Day

Unknown

Source Currentness Reference

publication date

Source Citation Abbreviation

osbhussboone

Process Description

The data for the coverage wasscanned off 1:500,000 scale mylars by Maine Geological Survey (MGS) in 1987. The original bedrock unit codes were added by the J.W. Sewall Co. in 1990 for the Maine Low-Level Radioactive Waste Authority. In 1994, staff at MGS identified and added codes for major bedrock faults.

Source Used Citation Abbreviation

500kbase

Source Used Citation Abbreviation

osbhussboone

Process Date

19940101

Contact Organization

(USGS) U.S. Geological Survey

Contact Position

District Chief

Address Type

mailing and physical address

Address

26 Ganneston Drive

City

Augusta

State or Province

Postal Code

04330

Country

USA

Contact Voice Telephone

(207) 622-8201

Process Description

The Maine Office of GIS completed the conversion of all final data layers from NAD27 to NAD83 in July 1999. All the data layers were converted using the ArcInfo (version 7.2.1) NADCON conversion and the "project" command. All data was copied to double precision, projected to NAD83, and then copied back to single precision. It was decided to keep the NAD27 quad structure instead of generating new quad boundaries from NAD83 coordinates - all indexes (quads) were projected to NAD83 by using the same process previously described. All MEGIS data libraries in ArcInfo Librarian were repopulated using the NAD83 indexes and data.

Process Date

19990701

Contact Organization

(MEGIS) Maine Office of Geographic Information Systems

Contact Person

David Kirouac

Address Type

mailing and physical address

Address

MEGIS174 SHS

City

Augusta

State or Province

Postal Code

04330

Country

USA

Contact Voice Telephone

(207) 215-6936

Contact Electronic Mail Address

david.kirouac@maine.gov

Hours of Service

8:00 AM - 4:00 PM

Cloud Cover

Direct Spatial Reference Method

Vector

SDTS Point and Vector Object Type

Area chain

Point and Vector Object Count

2412

[smcaptur]

true

Grid Coordinate System Name

UTM Zone Number

Scale Factor at Central Meridian

0.9996

Longitude of Central Meridian

-69

Latitude of Projection Origin

False Easting

500000

False Northing

Planar Coordinate Encoding Method

Abscissa Resolution

Ordinate Resolution

Horizontal Datum Name

North American Datum of 1983

Ellipsoid Name

Geodetic Reference System 80

Semi-major Axis

6378137

Denominator of Flattening Ratio

298.257

Entity Type Label

BEDROCKPoly

Entity Type Definition

polygon feature class

Entity Type Definition Source

Environmental Systems Research Institute, Inc. (ESRI)

Attribute Label

UNIT

Attribute Definition

bedrock unit name as shown on "Bedrock Geologic Map of Maine, Osberg, Hussey, and Boone, 1985"

Attribute Definition Source

a comma delimited text and .dbf format table are available for download at the Maine Office of GIS website on the Data Catalog page located at http://megis.maine.gov/catalog/ .

Beginning Date of Attribute Values

Attribute Measurement Frequency

Unknown

Entity Type Label

BEDROCKArc

Entity Type Definition

arc feature class

Entity Type Definition Source

Environmental Systems Research Institute, Inc. (ESRI)

Attribute Label

MAJOR1

Attribute Definition

codes for various types of bedrock faults

Enumerated Domain Value

591

Enumerated Domain Value Definition

geologic unit boundary, coded by USGS

Enumerated Domain Value

590

Enumerated Domain Value Definition

geologic unit boundary, coded by MGS

Enumerated Domain Value

Enumerated Domain Value Definition

arbitrary seaward boundary

Enumerated Domain Value

-9999

Enumerated Domain Value Definition

state boundary

Beginning Date of Attribute Values

Attribute Label

MINOR1

Attribute Definition

codes for various types of bedrock faults

Enumerated Domain Value

Enumerated Domain Value Definition

listric fault, downdropped on right side

Enumerated Domain Value Definition Source

when used with MAJOR1 codes 590 and 591

Enumerated Domain Value

Enumerated Domain Value Definition

listric fault, downdropped on left side

Enumerated Domain Value Definition Source

when used with MAJOR1 codes 590 and 591

Enumerated Domain Value

Enumerated Domain Value Definition

thrust fault, upper plate on right

Enumerated Domain Value Definition Source

when used with MAJOR1 codes 590 and 591

Enumerated Domain Value

Enumerated Domain Value Definition

thrust fault, upper plate on left

Enumerated Domain Value Definition Source

when used with MAJOR1 codes 590 and 591

Enumerated Domain Value

Enumerated Domain Value Definition

inferred fault

Enumerated Domain Value Definition Source

when used with MAJOR1 codes 590 and 591

Enumerated Domain Value

Enumerated Domain Value Definition

fault (high-angle, normal or reverse)

Enumerated Domain Value Definition Source

when used with MAJOR1 codes 590 and 591

Enumerated Domain Value

Enumerated Domain Value Definition

stratigraphic contact

Enumerated Domain Value Definition Source

when used with MAJOR1 codes 590 and 591

Beginning Date of Attribute Values

Entity and Attribute Overview

BEDROCK contains statewide bedrock geology map units and major faults. The original bedrock unit codes were added in 1990. In 1994, codes were added for major bedrock faults. Bedrock UNIT codes assigned to this coverage are available in comma delimited text, and .dbf format, on the Maine Office of GIS Data Catalog at http://megis.maine.gov/catalog/

Entity and Attribute Detail Citation

The ArcView shapefile and ArcGIS geodatabase formats, commonly used for Maine GIS data, carry default identifiers and attributes that are software generated and/or important for internal recordkeeping. These are listed here to avoid repetition for every layer, and may not be repeated in the attribute descriptions and definitions of each layer. Common software generated identifiers and attributes in Maine GIS data include: FID (feature identifier), Shape (feature geometry), OBJECTID and SHAPE_lengt. In addition, most GIS formats will carry fields for PERIMETER, AREA and/or LENGTH according to feature geometry. These fields are typically available by default, with the units based on coordinate system or projection units of GIS data. Most GIS software packages also provide a means to calculate these values. It is important to test any columns containing PERIMETER, AREA or LENGTH values before using them for analysis purposes. These important values can be carried from format to format and become out-dated. Verify that the values are correct. Also, in your GIS software, please view the properties of data layers for the map units used to calculate these fields, and for the units set for display purposes.

Entity and Attribute Overview

Entity and Attribute Detail Citation

Contact Organization

(MEGIS) Maine Office of Geographic Information Systems

Contact Person

GIS Coordinator

Contact Position

GIS Coordinator

Address Type

mailing address

Address

State House Station 174

City

Augusta

State or Province

Postal Code

04333-0174

Country

USA

Contact Voice Telephone

207 624-7700

Contact Facsimile Telephone

207 287-3842

Hours of Service

Monday through Friday 0800 - 1700 EST

Resource Description

http://megis.maine.gov/catalog/

Distribution Liability

Users must assume responsibility to determine the usability of this data for their purposes. Although these data have been processed successfully on a computer system at the Maine Office of Geographic Information Systems, no warranty expressed or implied is made by MEGIS regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. Neither the Maine Office of Geographic Information Systems, nor any of its contributors, is liable for misuse of the data, for damage, for transmission of viruses, or for computer contamination through the distribution of these data sets.

Format Name

ESRI Shapefile

Format Version Number

ARC Version 9.x

Format Specification

ArcView Shapefile Format

Format Information Content

MEGIS has made all vector layers, in the Maine GIS Internet Data Catalog, available in ESRI's ArcView shapefile format. A shapefile is a simple non-topological format that stores the geometry and attribute information for a set of geographic features as a set of vector (point, line, polygon) coordinates. Shapefiles draw quickly and directly in ArcView, ArcGIS, ArcExplorer. Shapefiles are a compatible data type for many other types of GIS software. Three files are fundamental to each shapefile: .shp stores the feature geometry (shape and location information); .shx stores the index of the feature geometry; .dbf a dBASE (TM) file stores the attribute information for the features. Other index files may be created to help speed analysis and query: these file formats are .sbn .sbx .ain .aix .fbn and .fbx. In addition you may find projection .prj, and metadata .xml, files associated with shapefiles.

File Decompression Technique

Data available from this website is in .zip compressed format. WinZip is a Windows based, PKZip-compatible compression utility. You will need a program like this to extract the data

Network Resource Name

http://megis.maine.gov/catalog/

[smhyperl]

-1

[accinstr]

These data are available to Internet browsers for download from the Maine GIS Internet Data Catalog - http://megis.maine.gov/catalog/Data available from this website is in .zip compressed format. WinZip is a Windows based, PKZip-compatible compression utility. You will need a program like this to extract the dataIf you are not already a GIS user, free software for viewing these files is available from Environmental Systems Research Institute, Inc. (ESRI) - www.esri.com

Fees

Data may be downloaded from Maine GIS Internet Data Catalog at no charge.

Turnaround

Data is available for immediate download from the Maine GIS Internet Data Catalog.

Technical Prerequisites

If you are not already a GIS user, free software for viewing these files is available from Environmental Systems Research Institute, Inc. (ESRI) http://www.esri.com/

Beginning Date

19950101

Beginning Time

Unknown

Ending Date

Present

Ending Time

Unknown

Contact Organization

Maine Office of Geographic Information Systems

Contact Position

GIS Coordinator

Address Type

mailing address

Address

State House Station 174

City

Augusta

State or Province

Postal Code

04333-0174

Country

USA

Contact Voice Telephone

(207) 624-7700

Contact Facsimile Telephone

(207) 287-3842

Hours of Service

Monday through Friday 0800 - 1700 EST

Distribution Liability

Users must assume responsibility to determine the usability of this data for their purposes.

Format Name

ARCSDE

Format Version Number

ArcSDE 9.x

Format Information Content

Oracle 9i

[accinstr]

Please contact the Maine Office of GIS (MEGIS) for access instructions.

Fees

Access is available through Maine's wide area network; WAN users may contact the Maine Office of Information Technology, Maine Office of Geographic Information Systems (MEGIS) for a login.

Metadata Reference Information

Metadata Date

20000701

Metadata Review Date

20070925

Metadata Future Review Date

Metadata Contact

Contact Organization	(MEGIS) Maine Office of Geographic Information Systems
Contact Person	GIS Coordinator
Contact Position	GIS Coordinator
Address Type	mailing address
Address	State House Station 174
City	Augusta
State or Province	ME
Postal Code	04333-0174
Country	USA
Contact Voice Telephone	207 624-7700
Contact Facsimile Telephone	207 287-3842
Hours of Service	Monday through Friday 0800 - 1700 EST

Metadata Standard Name

FGDC Content Standards for Digital Geospatial MetadataMetadata

Metadata Standard Version

FGDC-STD-001-1998

Metadata Access Constraints

none

Metadata Use Constraints

none