Coastal Maine Submerged Aquatic Vegetation Data 1993-1997Entry ID: Coastal_Change_Analysis_Program_Maine_SAV_data_set
Abstract: Maine's eelgrass (SAV) meadows form an important aquatic habitat for
the state. These meadows provide shelter for juvenile fish, and invertebrates.
In certain locations they also help stabilize unconsolidated sediments and
shorelines. Maine's Department of Marine Resources has mapped the SAV habitat
for the entire coast using the Coastal Change Analysis Protocol. This mapping
was accomplished from ... aerial photograhpy acquired between 1993 and 1997. The
unified coastal SAV data set is a composite of these multiple year data. The
benthic data is classified according to the System for Classification of
Habitats in Estuarine and Marine Environments (SCHEME). This system is fully
described in "Development of a System for Classification of Habitats in
Estuarine and Marine Environments (SCHEME) for Florida, Report to U.S. EPA -
Gulf of Mexico Program, Florida Fish and Wildlife Conservation Commission,
Florida Marine Research Institute. Review Draft 12/04/02."
Purpose: The state of Maine is mapping and monitoring SAV beds to assist in
locating sensitive areas for protection in the event of an oil spill. The SAV
maps also will form a baseline to determine trends in this system.
SPATIAL DATA ORGANIZATION INFORMATION
Direct Spatial Reference: Vector
SDTS Point and Vector Object Type: GT-polygon composed of chains
Point and Vector Object Count: 6715
SPATIAL ... REFERENCE INFORMATION - PLANAR
Grid Coordinate System Name: Universal Transverse Mercator
UTM Zone Number: 19
Scale Factor at Central Meridian: 0.999600
Longitude of Central Meridian: -69.000000
Latitude of Projection Origin: 0.000000
False Easting: 500000.000000
False Northing: 0.000000
Planar Coordinate Encoding Method: Coordinate pair
Planar Distance Units: Meters
SPATIAL REFERENCE INFORMATION - GEODETIC MODEL
Horizontal Datum Name: North American Datum of 1983
Ellipsoid Name: GRS 80
Semi-major Axis: 6378137.0000000
Denominator of Flattening Ratio: 298.26
NATIVE: Arc/Info n:\ccap2\mfinkbei\maine\habitat_data\megrassu
(Click for Interactive Map)
Data Set Citation
Dataset Originator/Creator: Maine Department of Marine Resources.
Dataset Title: Coastal Maine Submerged Aquatic Vegetation Data 1993-1997
Dataset Release Date: 1999-09-30
Dataset Release Place: West Boothbay Harbor, ME
Dataset Publisher: Maine Department of Marine Resources
Data Presentation Form: MapOnline Resource: http://www.csc.noaa.gov/data/#benthic
Start Date: 1993-01-01Stop Date: 1997-12-31
Quality 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.
LOGICAL CONSISTENCY REPORT: Following interpretation and digitization, a Arc
format polygon coverage was produced using the BUILD commands. An editing
process was also conducted to ensure proper polygon labelling and closure.
COMPLETENESS REPORT: All SAV habitat interpretable from aerial imagery was
mapped. No gaps exist in the geographic distribution of the data.
HORIZONTAL POSITIONAL ACCURACY REPORT: Horizontal accuracy meets national map
accuracy standards. This was one of the most important factors in the initial
VERTICAL POSITIONAL ACCURACY REPORT: Vertical accuracy was not tested.
PROCESS DESCRIPTION: Aerial photograhpy 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 DESCRIPTION: Photo-Interpretation The duplicated film diapositives were
interpreted monoscopically on a large-format light table. SAV habitat was
annotated on acetate overlays attached to the film. The habitat was assigned to
1 of four density classes based on percent ground coverage by actual eelgrass.
The photography was interpreted by a skilled analyst who is very familiar with
the local environment. GPS controlled field work was used to develop signatures
suitable form mapping. PROCESS DATE: 1993-1997
PROCESS DESCRIPTION: Data Vectorization At the conclusion of the interpretation
process, the diapositives were 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. Then 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 benthic data is
classified according to the System for Classification of Habitats in Estuarine
and Marine Environments (SCHEME). This system is fully described in
"Development of a System for Classification of Habitats in Estuarine and Marine
Environments (SCHEME) for Florida, Report to U.S. EPA - Gulf of Mexico Program,
Florida Fish and Wildlife Conservation Commission, Florida Marine Research
Institute. Review Draft 12/04/02."
SOURCE INFORMATION - CITATION: James Sewall Inc.. Conventional color metric
aerial photography. 1993. 1. GEOSPATIAL DATA PRESENTATION FORM: map. OTHER
CITATION DETAILS: Aerial photography acquired according to C-CAP protocol.
Coastal Change Analysis Program (C-CAP): Guidance for Regional Implementation.
NMFS Technical Report 123.
SOURCE SCALE DENOMINATOR: 12000.
TYPE OF SOURCE MEDIA: color film diapositives.
BEGINNING TIME: 1993.
ENDING TIME: 1997.
SOURCE CURRENTNESS REFERENCE: Ground Condition.
SOURCE CONTRIBUTION: The aerial photography was used to identify and delineate
SAV habitat. In addition, the photos form the backdrop for certain field
Access Constraints DISTRIBUTION LIABILITY: None
Use Constraints Not for Navigation
Data Set Progress
Distribution Media: ONLINE
Distribution Format: ESRI Arc Export format
Role: TECHNICAL CONTACT
Phone: (843) 740-1200
2234 South Hobson Avenue
Province or State: South Carolina
Postal Code: 29405
Role: DIF AUTHOR
Email: csc at csc.noaa.gov
NOAA Coastal Services Center 2234 South Hobson Avenue
Province or State: SC
Postal Code: 29405-2413
Creation and Review Dates
DIF Creation Date: 2000-04-03
Last DIF Revision Date: 2012-02-23