mecon500

Identification Information

Citation Information

Originator	U.S. Geologic Survey (USGS), Maine Office of Geographic Information Systems (MEGIS)(comp.)
Publication Date	19950101
Publication Time	Unknown
Title	mecon500
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	1:250000
Online Linkage	http://megis.maine.gov/catalog/
Calendar Date	1995

Abstract

MECON500 contains 500 foot contour intervals for Maine, generated from USGS 1:250,000 DEMs. Arcs are coded by elevation. Due to the nature of the source data, the positional accuracy of these contour lines varies from good to poor. Use of these data at scales of greater then 1:250,000 not recommended.

Purpose

MECON500 was created to provide a statewide vector coverage of elevation data for Maine suitable for statewide planning studies. Use of these data at scales of greater then 1:250,000 is strongly discouraged. Users must assume responsibility in determining the usability of this data for their purpose.

Time Period of Content

Calendar Date	1995
Time of Day	Unknown
Currentness Reference	publication date

Status

Progress	Complete
Maintenance and Update Frequency	None planned

Bounding Coordinates

West Bounding Coordinate	-71.00521
East Bounding Coordinate	-66.8582
North Bounding Coordinate	47.42546
South Bounding Coordinate	43.07604

Keywords

Theme	elevation (ISO Keyword Thesaurus)
Theme	contours, hypsography (Maine GIS Thesaurus-Theme)
Place	Maine, United States (Maine GIS Thesaurus-Place)
Stratum	land surface (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

(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

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, Maine GIS Internet Data Catalog http://megis.maine.gov/catalog/

Attribute Accuracy Report

Due to the nature of the source data, the attribute accuracy of these contour lines varies. Data was spot checked to known elevations. Please report errors.

Logical Consistency Report

Spatial topology meets "Data Standards for Maine Geographic Information Systems", June 2002.

Completeness Report

Data set is complete.

Horizontal Positional Accuracy Report

Due to the nature of the source data, the positional accuracy of these contour lines varies from good to poor. Due to the nature of the source data, the positional accuracy of these contour lines varies from good to poor. Use of these data at scales of greater then 1:250,000 not recommended.

Horizontal Positional Accuracy Value

127

Horizontal Positional Accuracy Explanation

Contour lines generated from USGS 1:250,000 DEMs

Vertical Positional Accuracy Report

National Map Accuracy Standard applies to USGS topographic maps. At all map scales, the maximum allowable vertical tolerance is one half the published contour interval.

Citation Information

Originator	U.S. Geological Survey (USGS)
Publication Date	1995
Publication Time	Unknown
Title	(250kdem) USGS 1:250,000 scale digital elevation models
Geospatial Data Presentation Form	raster digital data
Series Name	USGS Digital Elevation Models
Issue Identification	1:250000 DEM
Publication Place	Reston VA
Publisher	U.S. Geological Survey
Other Citation Details	3- x 3-arc second DEMS provides coverage in 1 x 1 degree blocks for all the contiguous United States, Hawaii and limited parts of Alaska. The basic elevation model is produced by or for the U.S. Department of Defense, Defense Mapping Agency (DMA), but is distributed by the USGS, EROS Data Center, in the DEM data record format. 1:250000 Digital Elevation Model data
Online Linkage	http://mapping.usgs.gov/mac/isb/pubs/factsheets/fs04000.html
Calendar Date	1995
Time of Day	Unknown
[smcisrcc]	publication date

Source Scale Denominator

250000

Type of Source Media

digital tape media

Calendar Date

1995

Time of Day

Unknown

Source Currentness Reference

publication date

Source Citation Abbreviation

250kdem

Source Contribution

500 foot contour lines

Process Description

MECON500 contains 500 foot contours for the entire state as generated from USGS 1:250,000 scale digital elevation models using Arc/Info software. Arcs are coded by elevation in feet and meters.

Source Used Citation Abbreviation

250kdem

Process Date

1995

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

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

Contact Position

GIS Senior Programmer Analyst

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

Cloud Cover

Direct Spatial Reference Method

Vector

SDTS Point and Vector Object Type

Complete chain

Point and Vector Object Count

7617

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

Altitude Datum Name

National Geodetic Vertical Datum of 1929

Entity Type Label

MECON500

Entity Type Definition

arc feature class

Entity Type Definition Source

Environmental Systems Research Institute, Inc. (ESRI)

Attribute Label

FEET

Attribute Definition

elevation of contour line in feet

Beginning Date of Attribute Values

Attribute Label

METERS

Attribute Definition

elevation of contour line in meters

Attribute Definition Source

default Arc/Info

Beginning Date of Attribute Values

Entity and Attribute Overview

Arcs are coded by elevation.

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

Arcs are coded by elevation.

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

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 data.If 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

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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.

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.

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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

20100119

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 Metadata

Metadata Standard Version

FGDC-STD-001-1998

Metadata Access Constraints

None

Metadata Use Constraints

None