eelgrass97

Citation:

Citation Information:

Originator: Seth Barker, Maine Department of Marine Resources (MEDMR)
Publication Date: 20030701
Title: eelgrass97
Geospatial Data Presentation Form: vector digital data
Series Information:

Series Name: Maine GIS
Issue Identification: SDE server; Internet Data Catalog

Publication Information:

Publication Place: Augusta ME
Publisher: Maine Office of Geographic Information Systems (MEGIS)

Other Citation Details: 1:24000
Online Linkage: http://megis.maine.gov/catalog/

Description:

Abstract:
eelgrass97 is a POLYGON coverage that represents Maine's eelgrass meadows, which form an important aquatic habitat for the state, suitable for mapping at 1:24,000 scale. These meadows provide shelter for juvenile fish, and invertebrates. In certain locations they also help stabilize unconsolidated sediments and shorelines.

As a continuing project, sections of the coast have been flown and photographed using Kodak 2448 film at a scale of 1:12000. This photography has been supplemented in the Penobscot Bay region by 1992 flights using Kodak 2445 film. The Penobscot Bay flights were contracted by the Maine Department of Transportation and interpreted by Dr. Fred Short of University of New Hampshire. Areas in the present study were flown in the July to October period during 1993 to 1997. When possible, photography was at the time of extreme low tides, low wind velocity, good water clarity, and maximum biomass of eelgrass. These factors aid in the detection of the subtidal portion a bed.

Transparencies from the 1993-1997 flights were oriented beneath and eelgrass bed locations compiled on stable-base manuscripts containing the coastline and other basemap features from the 1:24000 scale USGS topographic maps. Polygons delineating stands of eelgrass were digitized and coded using a four category scale of percent cover.

Verification has been carried out by boat, on foot, and by plane. Though dense patches of eelgrass approximately 6 meters in diameter and less can be identified under good conditions, a conservative estimate of the minimum mapping unit is 150 square meters. This represents a stand of approximately 14 meters in diameter.

Purpose:
Eelgrass beds along the Maine coast are being mapped in order to better understand the present day distribution and to aid in the identification of sensitive coastal areas for protection in the case of an oil spill.
Time Period of Content:

Time Period Information:

Range of Dates/Times:

Beginning Date: 1992
Ending Date: 1997

Currentness Reference: publication date

Status:

Progress: Complete
Maintenance and Update Frequency: None planned

Spatial Domain:

Bounding Coordinates:

West Bounding Coordinate: -70.8225
East Bounding Coordinate: -66.97426
North Bounding Coordinate: 45.10967
South Bounding Coordinate: 43.05744

Keywords:

Theme:

Theme Keyword Thesaurus: ISO Keyword Thesaurus
Theme Keyword: oceans
Theme Keyword: biota
Theme Keyword: environment
Theme Keyword: economy

Theme:

Theme Keyword Thesaurus: Maine GIS Thesaurus-Theme
Theme Keyword: habitat
Theme Keyword: eelgrass
Theme Keyword: submerged aquatic vegetation (SAV)
Theme Keyword: fisheries

Place:

Place Keyword Thesaurus: Maine GIS Thesaurus-Place
Place Keyword: Maine
Place Keyword: United States
Place Keyword: Gulf of Maine

Stratum:

Stratum Keyword Thesaurus: GCMD Parameter Keyword
Stratum Keyword: biosphere
Stratum Keyword: oceans

Access Constraints:
Secondary distribution by permission only. Please see Maine Office of Geographic Information Systems (MEGIS) License Agreement at http://megis.maine.gov/ . Any secondary distribution must have this documentation appended.
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. The Maine Office of Geographic Information Systems (MEGIS) provides notice of updates and corrections directly to the Maine GIS Technical Group and Maine GIS Users, through the MEGISTECH and MEGISUSER list servers. To subscribe please contact MeGIS through the Maine Office of Information Technology (OIT) Customer Support Center (CSC) at (207) 624-7700. To request data correction in, or provide updates to Maine GIS data, please use the contact information contained in the metadata. 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 in consultation with the Maine GIS Executive Council.
Point of Contact:

Contact Information:

Contact Organization Primary:

Contact Organization: (MEDMR) Maine Department of Marine Resources

Contact Position: GIS Specialist
Contact Address:

Address Type: mailing address
Address: PO Box 8
City: West Boothbay Harbor
State or Province: ME
Postal Code: 04575
Country: USA

Contact Voice Telephone: (207) 633-9507
Contact Facsimile Telephone: (207) 633-9579
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:
(MEDMR)Arc/Info g:\eelgrass\megrass5; 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 http://megis.maine.gov/catalog/

Attribute Accuracy:

Attribute Accuracy Report:
Thematic accuracy was checked using GPS controlled navigation to representative areas of the coastline. The vector polygon data was loaded into a field PC and displayed in ArcView software. A tracking software allowed the analyst to travel to specific points in the data with precision and to check the type of habitat in the field. Sample sites were selected based on their location and distribution along the coast. No empirical accuracy statistics were generated. Proof plots were checked against original manuscripts
Logical Consistency Report: Following interpretation and digitization, an Arc/Info format polygon coverage was BUILT. An editing process was also conducted to ensure proper closure and labeling.
Completeness Report: All eelgrass beds interpretable from aerial photography were mapped.
Positional Accuracy:

Horizontal Positional Accuracy:

Horizontal Positional Accuracy Report: Approximate horizontal accuracy is 12 meters, assuming source data meets National Map Accuracy Standards.
Quantitative Horizontal Positional Accuracy Assessment:

Horizontal Positional Accuracy Value: 12
Horizontal Positional Accuracy Explanation: Compilation base data meets National Map Accuracy Standards for 1:24,000 scale.

Lineage:

Source Information:

Source Citation:

Citation Information:

Originator: Maine Department of Transportation (MEDOT), Dr. Fred Short Univeristy of New Hampshire (UNH) (ed.), Seth Barker Maine Department of Marine Resources (MEDMR) (comp.)
Title: (KODAK2445)MEGRASSPHOTOS
Geospatial Data Presentation Form: remote-sensing image
Series Information:

Series Name: Eelgrass Mapping Project
Issue Identification: Photography Penobscot Bay

Publication Information:

Publication Place: Augusta ME
Publisher: Maine Office of Geographic Information Systems (MEGIS)

Source Scale Denominator: 12000
Type of Source Media: filmstrip
Source Time Period of Content:

Time Period Information:

Single Date/Time:

Calendar Date: 1992
Time of Day: Unknown

Source Currentness Reference: ground condition

Source Citation Abbreviation: kodak2445
Source Contribution:
Eelgrass photography has been supplemented in the Penobscot Bay region by 1992 flights using Kodak 2445 film. The Penobscot Bay flights were contracted for by the MEDOT and interpreted by Dr. Fred Short of UNH.
Source Information:

Source Citation:

Citation Information:

Originator: Seth Barker Maine Department of Marine Resources (MEDMR)
Title: (KODAK2448)MEGRASSPHOTOS
Geospatial Data Presentation Form: remote-sensing image
Series Information:

Series Name: Eelgrass Mapping Project
Issue Identification: Photography

Publication Information:

Publication Place: Augusta ME
Publisher: Maine Office of Geographic Information Systems (MEGIS)

Source Scale Denominator: 12000
Type of Source Media: filmstrip
Source Time Period of Content:

Time Period Information:

Range of Dates/Times:

Beginning Date: 1993
Beginning Time: Unknown
Ending Date: 1997
Ending Time: Unknown

Source Currentness Reference: ground condition

Source Citation Abbreviation: kodak2448
Source Contribution: As a continuing eelgrass mapping project, sections of the coast have been flown and photographed using Kodak 2448 film at a scale of 1:12000.

Source Information:

Source Citation:

Citation Information:

Originator: U.S. Geological Survey (USGS)
Publication Date: multiple dates
Publication Time: Unknown
Title: (24k) USGS 1:24,000 scale quadrangles
Geospatial Data Presentation Form: map
Series Information:

Series Name: National Mapping Program Standard Series Topographic Maps
Issue Identification: USGS 7.5 Minute Map Series

Publication Information:

Publication Place: Reston VA
Publisher: U.S. Geological Survey

Other Citation Details: 24000 Publication date is unique to each quadrangle in the map series. Standard 7.5x7.5 minute quadrangles cover geographic areas of 49 to 71 square miles. 1 inch at map scale represents 2000 feet.
Online Linkage: http://mapping.usgs.gov/mac/maplists/howtoselectmaps.html

Source Scale Denominator: 24000
Type of Source Media: stable-base material (mylar)
Source Time Period of Content:

Time Period Information:

Range of Dates/Times:

Beginning Date: 1/1/1948
Beginning Time: Unknown
Ending Date: Present
Ending Time: Unknown

Source Currentness Reference: publication date

Source Citation Abbreviation: 24k
Source Contribution: Eelgrass bed locations were compiled on stable-base manuscripts containing the coastline and other basemap features from the 24k USGS topographic maps.

Process Step:

Process Description:
Photo-Interpretation- Duplicated film diapositives were interpreted monoscopically on a large-format light table. Submerged aquatic vegetation (SAV) habitat was annotated on acetate overlays attached to the film. The habitat was assigned to one (1) of four (4) density classes based on percent ground coverage by actual eelgrass. The photography was interpreted by a skilled analyst very familiar with the local environment. GPS controlled field work was used to develop signatures suitable for mapping.
Process Date: 1997
Process Contact:

Contact Information:

Contact Organization Primary:

Contact Organization: (MEDMR) Maine Department of Marine Resources

Contact Position: GIS Specialist
Contact Address:

Address Type: mailing address
Address: PO Box 8
City: West Boothbay Harbor
State or Province: ME
Postal Code: 04575
Country: USA

Contact Voice Telephone: (207) 633-9507
Contact Facsimile Telephone: (207) 633-9579
Hours of Service: Monday through Friday 0800 - 1700 EST

Process Step:

Process Description:
Data Vectorization- At the conclusion of the interpretation process, the diapositives with overlays attached were placed on the light table below mylar USGS 7.5 minute quads. The photos were manually fitted to the USGS map and the habitat polygons were transferred to the quad mylars. The annotated mylar was scanned and an automated vectorization software was used to capture the linework as ESRI vectors. These vectors were manually edited and a polygon coverage was built using ArcInfo software. The polygon coverage was then attributed according to the four SAV density classes.
Process Date: 1997
Process Contact:

Contact Information:

Contact Organization Primary:

Contact Organization: (MEDMR) Maine Department of Marine Resources

Contact Position: GIS Specialist
Contact Address:

Address Type: mailing address
Address: PO Box 8
City: West Boothbay Harbor
State or Province: ME
Postal Code: 04575
Country: USA

Contact Voice Telephone: (207) 633-9507
Contact Facsimile Telephone: (207) 633-9579
Hours of Service: Monday through Friday 0800 - 1700 EST

Process Step:

Process Description:
Aerial Photography Acquisition- Conventional color (Kodak Aerochrome 2448) film was acquired over the Maine coast at a nominal scale of 1:12,000. The coast was flown in an incremental fashion in 1993, 1994, 1995, 1996, and 1997. The film was flown according to the environmental parameters recommended in the C-CAP protocol. The mission specifications included 60% endlap and 30% sidelap for adjacent lines. A 153mm color-corrected lens and Wild RC10 camera were used to collect the imagery.
Process Date: 1997
Process Contact:

Contact Information:

Contact Organization Primary:

Contact Organization: (MEDMR) Maine Department of Marine Resources

Contact Position: GIS Specialist
Contact Address:

Address Type: mailing address
Address: PO Box 8
City: West Boothbay Harbor
State or Province: ME
Postal Code: 04575
Country: USA

Contact Voice Telephone: (207) 633-9507
Contact Facsimile Telephone: (207) 633-9579
Hours of Service: Monday through Friday 0800 - 1700 EST

Cloud Cover: 0

Direct Spatial Reference Method: Vector
Point and Vector Object Information:

SDTS Terms Description:

SDTS Point and Vector Object Type: Area chain
Point and Vector Object Count: 7519

Horizontal Coordinate System Definition:

Planar:

Grid Coordinate System:

Grid Coordinate System Name: Universal Transverse Mercator 1983
Universal Transverse Mercator:

UTM Zone Number: 19
Transverse Mercator:

Scale Factor at Central Meridian: 0.9996
Longitude of Central Meridian: -69
Latitude of Projection Origin: 0
False Easting: 500000
False Northing: 0

Planar Coordinate Information:

Planar Coordinate Encoding Method: Coordinate Pair
Coordinate Representation:

Abscissa Resolution: 1
Ordinate Resolution: 1

Planar Distance Units: meters

Geodetic Model:

Horizontal Datum Name: North American Datum of 1983
Ellipsoid Name: Geodetic Reference System 80
Semi-major Axis: 6378137
Denominator of Flattening Ratio: 298.257

Detailed Description:

Entity Type:

Entity Type Label: eelgrass97
Entity Type Definition: polygon feature class
Entity Type Definition Source: Environmental Systems Research Institute, Inc. (ESRI)

Attribute:

Attribute Label: ACRES
Attribute Definition: area of mapped eelgrass meadow in acres

Attribute:

Attribute Label: COVER
Attribute Definition: eelgrass percent cover
Attribute Definition Source: User Defined
Attribute Domain Values:

Range Domain:

Range Domain Minimum: 0
Range Domain Maximum: 5

Enumerated Domain:

Enumerated Domain Value: 0
Enumerated Domain Value Definition: no submerged aquatic vegetation (SAV)
Enumerated Domain Value: 1
Enumerated Domain Value Definition: 0-10% cover (very sparse)
Enumerated Domain Value: 2
Enumerated Domain Value Definition: 10-40% cover (sparse)
Enumerated Domain Value: 3
Enumerated Domain Value Definition: 40-70% cover (moderate)
Enumerated Domain Value: 4
Enumerated Domain Value Definition: 70-100% cover (dense)
Enumerated Domain Value: 5
Enumerated Domain Value Definition: uncoded

Attribute:

Attribute Label: HECTARES
Attribute Definition: area of mapped eelgrass meadow in hectares

Attribute:

Attribute Label: LOCATION
Attribute Definition: location in relation to low water
Attribute Definition Source: User Defined
Attribute Domain Values:

Enumerated Domain:

Enumerated Domain Value: i
Enumerated Domain Value Definition: intertidal
Enumerated Domain Value: s
Enumerated Domain Value Definition: subtidal
Enumerated Domain Value: u
Enumerated Domain Value Definition: undetermined

Overview Description:

Entity and Attribute Overview: eelgrass97 POLYGONS are attributed with percent of eelgrass COVER and LOCATION in relation to low water.
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.

Distributor:

Contact Information:

Contact Organization Primary:

Contact Organization: (MEGIS) Maine Office of Geographic Information Systems

Contact Position: GIS Coordinator
Contact Address:

Address Type: mailing address
Address: State House Station 145
City: Augusta
State or Province: ME
Postal Code: 04333-0145
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.
Standard Order Process:

Digital Form:

Digital Transfer Information:

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. A link to a trial copy WinZip software is available at http://megis.maine.gov/links/.
Digital Transfer Option:

Online Option:

Computer Contact Information:

Network Address:

Network Resource Name: http://megis.maine.gov/catalog/

Access Instructions:
These data are available to Internet browsers for download from the Maine GIS Internet Data 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. A link to a trial copy WinZip software is available at http://megis.maine.gov/links/. If you are not already a GIS user, free software for viewing these files is available from Environmental Systems Research Institute, Inc. (ESRI). See http://megis.maine.gov/links/ for a link to ArcExplorer 9.x .
Digital Transfer Option:

Online Option:

Access Instructions: Where file size and Internet access permit, data requests can be made available via File Transfer Protocol (FTP).

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.

Standard Order Process:

Distributor:

Contact Information:

Contact Organization Primary:

Contact Organization: (MEGIS) Maine Office of Geographic Information Systems

Contact Position: GIS Coordinator
Contact Address:

Address Type: mailing address
Address: State House Station 145
City: Augusta
State or Province: ME
Postal Code: 04333-0145
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.
Standard Order Process:

Digital Form:

Digital Transfer Information:

Format Name: ARCSDE
Format Version Number: ArcSDE 9.x
Format Information Content: Oracle 9i

Digital Transfer Option:

Online Option:

Access Instructions: 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 Date: 5/11/1999
Metadata Review Date: 10/12/2007
Metadata Future Review Date:
Metadata Contact:

Contact Information:

Contact Organization Primary:

Contact Organization: (MEDMR) Maine Department of Marine Resources

Contact Position: GIS Specialist
Contact Address:

Address Type: mailing address
Address: PO Box 8
City: West Boothbay Harbor
State or Province: ME
Postal Code: 04575
Country: USA

Contact Voice Telephone: (207) 633-9507
Contact Facsimile Telephone: (207) 633-9579
Hours of Service: Monday through Friday 0800 - 1700 EST

Metadata Standard Name: FGDC CSDGM
Metadata Standard Version: FGDC-STD-001-1998