Nearshore Habitats, Narragansett & Mt. Hope Bay (polygons)

Citation:

Citation Information:

Originator:
State of Rhode Island, Dept of Environmental Management Narragansett Bay Estuary Program

Publication Date: 1998
Publication Time: Unknown
Title: Nearshore Habitats, Narragansett & Mt. Hope Bay (polygons)

Description:

Abstract:
ArcInfo polygon coverage describing areal features:
Submerged aquatic vegetation (sav) primarily eelgrass, coastal wetlands, shoreline, and selected coastal features of Narragansett and Mt Hope Bay, delineated from true color aerial photography at 1 to 12,000 and 1 to 40,000 scale (taken 7/6/96 & 8/11/96) aclassified and coded according to U.S. Fish and Wildlife Service's "Classification of Wetlands and Deepwater Habitats of the United States. (Cowardin, 1979; reprinted 1992).

Changes in the size, density, dominance, or composition of the coastal vegetation may have occurred since date of photography.

Photo-interpretation of submerged aquatic vegetation was limited by water clarity, light penetration, and water depth.

The target minimum polygonal mapping units .5 acre for eelgrass beds; .25 acre for isolated (discrete) coastal wetlands and features, and 3 to 5 acres for internal polygons

The shoreline is a representation of the inland edge of coastal features as photo-interpreted from the 1:40,000 scale aerial photography.

All maps created with this data are for planning purposes only.

Aerial photography by J.W Sewell Company. Interpreted by the UMASS Natural Resources Assessment Group.

Purpose: Planning study for critical habitat protection; inventory of eelgrass beds.
Supplemental Information: Funding for this project was provided by: U.S. EPA, RIDEM Aqua Fund and Narragansett Bay Estuary Programs, and Save The Bay, Inc. The City of Warwick, RI was also involved as a cooperative partner.

Time Period of Content:

Time Period Information:

Single Date/Time:

Calendar Date: 8/6/1997

Currentness Reference: publication date

Status:

Progress: In Work
Maintenance and Update Frequency: Unknown

Spatial Domain:

Bounding Coordinates:

West Bounding Coordinate: -71.501
East Bounding Coordinate: -70.98679
North Bounding Coordinate: 41.87617
South Bounding Coordinate: 41.3564

Keywords:

Theme:

Theme Keyword Thesaurus: None
Theme Keyword: eelgrass
Theme Keyword: Zostera marina
Theme Keyword: wetlands
Theme Keyword: habitats
Theme Keyword: marine
Theme Keyword: estuarine
Theme Keyword: coastal wetlands
Theme Keyword: critical habitats

Place:

Place Keyword Thesaurus: None
Place Keyword: US
Place Keyword: New England
Place Keyword: Rhode Island
Place Keyword: Narragansett Bay

Access Constraints: none
Use Constraints:
This data is intended for planning purposes only. Users must credit Narragansett Bay Estuary Program in any reports or maps derived from the dataset.

Point of Contact:

Contact Information:

Contact Person Primary:

Contact Person: Helen Cottrell
Contact Organization: RI Dept of Environmental Management, Narragansett Bay Estuary Program

Contact Position: Principal Environmental Scientist
Contact Address:

Address Type: mailing and physical address
Address: 235 Promenade Street
City: Providence
State or Province: RI
Postal Code: 02908
Country: USA

Contact Voice Telephone: (401) 222-3961 extension7273
Contact Electronic Mail Address: hcottrel@dem.state.ri.us
Hours of Service: 8:30 am to 4:00 PM
Contact Instructions: e-mail preferred

Data Set Credit: Irene Huber, Todd Nuerminger, David Foulis, Lynn Carlson, Helen Cottrell, Chris Deacutis, Nicole Cromwell, Andy Lipsky, Paul Jordan
Native Data Set Environment: ArcInfo 8.0.2 coverage format. Windows NT 4.0 sp6

Attribute Accuracy:

Attribute Accuracy Report: polygons color coded on proof plots then visually compared with source material by UMASS and DEM GIS Program staff

Logical Consistency Report: polygon topology with a minimum resolution of .5 acres for eelgrass beds and .25 acres for all other features
Completeness Report: interpretation of submerged vegetation features was limited by water depth, clarity and light penetration
Positional Accuracy:

Horizontal Positional Accuracy:

Horizontal Positional Accuracy Report: +/- 40 feet

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: 2621

Horizontal Coordinate System Definition:

Planar:

Grid Coordinate System:

Grid Coordinate System Name: State Plane Coordinate System 1983
State Plane Coordinate System:

SPCS Zone Identifier: 3800
Transverse Mercator:

Scale Factor at Central Meridian: 0.9999375
Longitude of Central Meridian: -71.5
Latitude of Projection Origin: 41.0833333333
False Easting: 100000
False Northing: 0

Planar Coordinate Information:

Planar Coordinate Encoding Method: Coordinate Pair
Coordinate Representation:

Abscissa Resolution: 1
Ordinate Resolution: 1

Planar Distance Units: svy_ft

Geodetic Model:

Horizontal Datum Name: North American Datum of 1983
Ellipsoid Name: Geodetic Reference System 80
Semi-major Axis: 6378206
Denominator of Flattening Ratio: 294.9786982

Detailed Description:

Entity Type:

Entity Type Label: eelgrass.pat
Entity Type Definition: Polygon attribute table
Entity Type Definition Source: RIDEM GIS Program

Overview Description:

Entity and Attribute Overview:
Items in the Polygon Attribute Table
CODE
An alpha numeric classification that corresponds to the type of wetland/eelgrass bed.
U.S. Fish and Wildlife Service's Classification of Wetlands and Deepwater Habitats of the United States (Cowardin,et. al., 1979)
Example: E2EM1Pd6 is Estuarine Intertidal Emergent Persistent Ditched Brackish
The first character is the System:
E=Estuarine, M=Marine
The second number is the Sub System:
1=Subtidal, 2=Intertidal
The third and fourth characters comprise the Class:
AB = Aquatic Bed
UB = Unconsolidated Bottom
EM = Emergent
RF = Reef
RS = Rocky Shore
SS = Scrub-shrub
US = Unconsolidated Shore
SB = Streambed
The fifth number is the Sub-Class:
AB1 = Aquatic Bed, Algal
AB3 = Aquatic Bed, Rooted Vascular
AB4 = Aquatic Bed, Floating Vascular
UB = Has no subclasses
EM1 = Emergent, Persistent
EM5 = Emergent, Phragmites australis
RF2 = Reef, Mollusc
RS1 = Rocky Shore, Bedrock
RS2 = Rocky Shore, Rubble
SS1 = Scrub Shrub, Broad Leaved Deciduous
US1 = Unconsolidated Shore, Cobble-Gravel
US2 = Unconsolidated Shore, Sand
US3 = Unconsolidated Shore, Mud
The 6th character is the Water Regime:
L = Subtidal
N = Tidal, Regularly Flooded
P = Tidal, Irregularly Flooded
M = Tidal, Irregularly Exposed
If the CODE is E1AB3L or M1AB3L, then the 7th character is a Special Modifier for percent cover:
e = % Cover cannot be determined; eelgrass signature is present, but there is no density
d = 70% to 100% cover
c = 40% to 69% cover
b = 10% to 39% cover
a = < 10% cover
If the CODE is NOT E1AB3L or M1AB3L, then the 7th character is a Special Modifier for human impact:
d = ditched
h = diked / impounded
r = artificial substrate
x = excavated
The 8th character is the Water Chemistry:
6 = Brackish

grp_2
Consolidation of CODE values into 20 groups for cartographic production
UPL = Uplands
DUNE = Dunes
EAB = Estuarine Aquatic Beds (Eelgrass)
EOW = Estuarine Open Water
ESM = Estuarine Salt Marsh
EBM = Estuarine Brackish Marsh
EPM = Estuarine Phragmites Marsh
EPBM = Estuarine Phragmites Brackish Marsh
OR = Oyster Reefs
RS = Rocky Shores
ESSW = Estuarine Scrub Shrub Wetland
EB = Estuarine Beaches and Tidal Flats
ETFPP = Estuarine Pannes, Pools and Irregulary Exposed Flats
MAB = Marine Aquatic Bed, Eelgrass
MOW = Marine Open Water
MRS = Marine Rocky Shore
MB = Marine Beaches
SB = Streambeds

grp_2_desc
Descriptive text for grp_2 as shown above

grp_3
Further consolidation of grp_2 values for cartographic production
removes the distinction between estuarine and marine features

Density
Describes the density of vegetative cover for aquatic beds (eelgrass)
as a percentage of the total area covered by the bed

Calc_acres
Calculation of feature area in acres
acres = ArcInfo calculated area / 43560

Entity and Attribute Detail Citation: Paul Jordan, State of RI, Dept of Environmental Mangement GIS Program

Metadata Date: 7/2/2000
Metadata Review Date: 7/5/2000
Metadata Future Review Date: 7/5/2001
Metadata Contact:

Contact Information:

Contact Organization Primary:

Contact Organization: State of Rhode Island, Department of Environmental Management
Contact Person: Paul Jordan

Contact Position: GIS Manager
Contact Address:

Address Type: mailing and physical address
Address:
RIDEM / GIS Program 235 Promenade Street

City: Providence
State or Province: RI
Postal Code: 02980
Country: USA

Contact Voice Telephone: 401-222-2776 x4315
Contact Facsimile Telephone: 401-222-2069
Contact Electronic Mail Address: pjordan@dem.state.ri.us
Hours of Service: 8:30am to 4:30pm (Eastern)
Contact Instructions: e-mail is prefered method of contact

Metadata Standard Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata Standard Version: FGDC-STD-002-1999
Metadata Time Convention: local time