eelgrass05

Citation:

Citation Information:

Originator: Seth Barker, Maine Department of Marine Resources (MEDMR)
Title: eelgrass05
Edition: 2005
Geospatial Data Presentation Form: vector digital data
Series Information:

Series Name: Maine GIS Data Catalog

Publication Information:

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

Other Citation Details: Edition in this sense is the last year of photography. Field work was continued in 2006.
Online Linkage: http://megis.maine.gov/

Description:

Abstract:
Maine's eelgrass meadows form an important marine and estuarine coastal aquatic habitat for the state. Along with other plants, eelgrass forms the base of food production in the sea. Eelgrass provides shelter for juvenile fish, and invertebrates, is a site for primary settlement of the larvae of some bivalve mollusks, and in certain locations helps to stabilize unconsolidated sediments and shorelines.
As a continuing project, sections of the coast have been flown and photographed using Kodak 2448 and 2427 film at a scale of 1:12000. This photography was 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 and again in the 2001 to 2005 time period. 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.

In the period 1992-1997, eelgrass bed locations were 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. In the 2001 to 2005 time period polygons were screen digitized.

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 and in some cases were mapped, 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 mapped in order to better understand their importance as habitat, to record 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
Beginning Time: Unknown
Ending Date: 2005
Ending Time: Unknown

Currentness Reference: publication date

Status:

Progress: Complete
Maintenance and Update Frequency: Irregular

Spatial Domain:

Bounding Coordinates:

West Bounding Coordinate: -70.886725
East Bounding Coordinate: -66.97426
North Bounding Coordinate: 45.12764
South Bounding Coordinate: 43.055221

Keywords:

Theme:

Theme Keyword Thesaurus: Maine GIS Thesaurus-Theme
Theme Keyword: 24000
Theme Keyword: BIOLOGY
Theme Keyword: habitat
Theme Keyword: eelgrass
Theme Keyword: submerged aquatic vegetation (SAV)
Theme Keyword: coastal
Theme Keyword: Zostera marina

Place:

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

Stratum:

Stratum Keyword Thesaurus: Maine GIS Thesaurus-Stratum
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 most recent 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 the MEGIS technical support line at (207) 287-6144. To request data correction in, or provide updates to, Maine GIS data a feedback form is available at http://megis.maine.gov/ or you may contact MEGIS directly. MEGIS is not responsible for local edits to data or 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 Person: Seth Barker

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
Contact Electronic Mail Address: seth.barker@maine.gov
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: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.2.1350

Attribute Accuracy:

Attribute Accuracy Report:
Since 1993, thematic accuracy has been checked using GPS controlled navigation to representative areas of the coastline. Since 1996, vector polygon data was loaded into a field or handheld PC and displayed in ArcView or ArcPad software. A tracking software allowed the analyst to travel to specific points in the data with precision and to check the type and location of habitat in the field. Sample sites were selected based on their location and distribution along the coast. No empirical accuracy statistics were generated. Between 1992 and 1997, proof plots were checked against original manuscripts
Logical Consistency Report:
In 1992, hard copy maps were produced form Maine Dept. of Transportation in an area covering the perimeter of Penobscot Bat and Islesboro. These original maps, produced by Dr. Fred Short of Salmon Falls Consultants (and UNH), were digitized by Seth Barker of MeDMR between 1993 and 1994. Following digitization, an Arc/Info format polygon coverage was BUILT. An editing process was also conducted to ensure proper closure and labeling.
Between 1993 and 1997, following interpretation and digitization, an Arc/Info format polygon coverage was BUILT. An editing process was also conducted to ensure proper closure and labeling.

After 1997, polygons were first screen digitized as ESRI shape files and then coded. As sections of the coast were remapped earlier polygons have been replaced. All poygons were reviewed for proper 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.

Lineage:

Source Information:

Source Citation:

Citation Information:

Originator: Sewall Co., Old Town , Maine; Maine Department of Transportation (MEDOT); Dr. Fred Short Univeristy of New Hampshire (UNH) (ed.); Seth Barker Maine Department of Marine Resources (MEDMR) (comp.)
Title: KODAK 2445 Photography
Geospatial Data Presentation Form: remote-sensing image
Series Information:

Series Name: Eelgrass Mapping Project 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: Large format aerial photography
Source Time Period of Content:

Time Period Information:

Multiple Dates/Times:

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 Salmon Falls Consultants (and UNH).
Source Information:

Source Citation:

Citation Information:

Originator: Sewall Co., Old Town, Maine; Seth Barker Maine Department of Marine Resources (MEDMR)
Title: KODAK 2448 Photography
Geospatial Data Presentation Form: remote-sensing image
Series Information:

Series Name: Eelgrass Mapping Project Photography

Publication Information:

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

Source Scale Denominator: 12000
Type of Source Media: Large format aerial photography
Source Time Period of Content:

Time Period Information:

Range of Dates/Times:

Beginning Date: 1993
Beginning Time: Unknown
Ending Date: 2002
Ending Time: Unknown

Source Currentness Reference: ground condition

Source Citation Abbreviation: Kodak2448
Source Contribution: Between 1993 and 2002, 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: Sewall Co., Old Town, Maine; Seth Barker Maine Department of Marine Resources (MEDMR)
Title: Kodak 2427 Photography
Geospatial Data Presentation Form: remote-sensing image
Publication Information:

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

Source Scale Denominator: 12000
Type of Source Media: Large format aerial photography
Source Time Period of Content:

Time Period Information:

Range of Dates/Times:

Beginning Date: 2003
Beginning Time: Unknown
Ending Date: 2005
Ending Time: Unknown

Source Currentness Reference: publication date

Source Citation Abbreviation: Kodak 2427
Source Contribution: Between 2003 and 2005, sections of the coast have been flown and photographed using Kodak 2427 film at a scale of 1:12000.

Process Step:

Process Description:
Photo-Interpretation- Film diapositives transparencies 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: 1993-1997
Process Contact:

Contact Information:

Contact Organization Primary:

Contact Organization: (MEDMR) Maine Department of Marine Resources
Contact Person: Seth Barker

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
Contact Electronic Mail Address: seth.barker@maine.gov
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: 1993-1997
Process Contact:

Contact Information:

Contact Organization Primary:

Contact Organization: (MEDMR) Maine Department of Marine Resources
Contact Person: Seth Barker

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
Contact Electronic Mail Address: seth.barker@maine.gov
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: 1993-1997
Process Contact:

Contact Information:

Contact Organization Primary:

Contact Organization: (MEDMR) Maine Department of Marine Resources
Contact Person: Seth Barker

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
Contact Electronic Mail Address: seth.barker@maine.gov
Hours of Service: Monday through Friday 0800 - 1700 EST

Process Step:

Process Description:
Photo-Interpretation- The original portion of Penobscot Bay which included the perimeter of the bay and Islesboro was compiled by Dr. Fred Short of Salmon Falls Consultants (and UNH) for MeDOT. Stable base, hard copy maps were provided to MeDOT in fulfillment of that contract. These manuscripts were digitized on a Calcomp digitizing table and built into polygons using ArcInfo (ESRI).
Process Date: 1992

Process Step:

Process Description:
Between 2001 and 2005, original film diapositive transparencies were scanned, georeferenced, and viewed in their original form and on screen to carry out photointerpretations. Between 2001 and 2002 individual photography were georeferenced using ArcView 3.x. Between 2003 and 2005 images were mosaiced as 7 1/2 minute quarter quads and referenced to a 1:24000 base.
Process Date: 2001-2005
Process Contact:

Contact Information:

Contact Organization Primary:

Contact Organization: Maine Department of Marine Resources

Contact Position: GIS Specialist
Contact Address:

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

Contact Voice Telephone: 207 667 5654
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: G-polygon
Point and Vector Object Count: 5790

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: 0.000143
Ordinate Resolution: 0.000143

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

Vertical Coordinate System Definition:

Altitude System Definition:

Altitude Resolution: 1.000000
Altitude Encoding Method: Explicit elevation coordinate included with horizontal coordinates

Detailed Description:

Entity Type:

Entity Type Label: eelgrass05
Entity Type Definition: polygon attribute table
Entity Type Definition Source: Environmental Systems Research Institute, Inc. (ESRI)

Attribute:

Attribute Label: ACRES
Attribute Definition: Area of polygon in acres
Attribute Definition Source: user calculated

Attribute:

Attribute Label: COVER
Attribute Definition: eelgrass percent cover
Attribute Definition Source: user defined
Attribute Domain Values:

Enumerated Domain:

Enumerated Domain Value: 1
Enumerated Domain Value Definition: gt 0% to 10% cover

Enumerated Domain:

Enumerated Domain Value: 2
Enumerated Domain Value Definition: 10% to 40% cover

Enumerated Domain:

Enumerated Domain Value: 3
Enumerated Domain Value Definition: 40% to 70% cover

Enumerated Domain:

Enumerated Domain Value: 4
Enumerated Domain Value Definition: 70% to 100% cover

Enumerated Domain:

Enumerated Domain Value: 5
Enumerated Domain Value Definition: eelgrass present but % cover not coded

Enumerated Domain:

Enumerated Domain Value: 0
Enumerated Domain Value Definition: no eelgrass

Attribute:

Attribute Label: HECTARES
Attribute Definition: Area of polygon in hectares
Attribute Definition Source: user calculated

Attribute:

Attribute Label: OBJECTID
Attribute Definition: Internal feature number.
Attribute Definition Source: ESRI
Attribute Domain Values:

Unrepresentable Domain: Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute Label: YEAR
Attribute Definition: Calendar Year
Attribute Definition Source: Date of photography
Attribute Domain Values:

Range Domain:

Range Domain Minimum: 0.03299
Range Domain Maximum: 2497039.87500

Beginning Date of Attribute Values: 1992
Ending Date of Attribute Values: 2005

Overview Description:

Entity and Attribute Overview: eelgrass05 POLYGONS are attributed with percent of eelgrass COVER.

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

Resource Description: Downloadable Data
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.
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Digital Transfer Option:

Online Option:

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 .
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Online Option:

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Fees: Data may be downloaded from Maine GIS Internet Data Catalog at no charge.
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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: 9/20/2007
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 Person: Seth Barker

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
Contact Electronic Mail Address: seth.barker@maine.gov
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 Time Convention: local time
Metadata Extensions:

Online Linkage: http://www.esri.com/metadata/esriprof80.html
Profile Name: ESRI Metadata Profile