Marina Suitability Coverage - Water Quality

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator:

Comprehensive Coastal Inventory, Virginia Institute of Marine Science

Publication_Date: 2002

Title: Marina Suitability Coverage - Water Quality

Geospatial_Data_Presentation_Form: vector digital data

Publication_Information:

Publication_Place: Gloucester Point, Virginia

Publisher: Virginia Institute of Marine Science

Online_Linkage:

<URL:http://ccrm.vims.edu/marinasiting.html>

Description:

Abstract:

This coverage was generated in support of a project intended to assist local planners evaluate proposals for marina development in their communities. The project uses GIS data to model criteria adopted by the Virginia Marine Resources Commission for site suitability for marina construction. Various parameters were ranked and evaluated for suitability on the basis of three major criteria: habitat, water quality, and design. This coverage contains the parameters for the water quality criteria.

Purpose:

To provide planners with information regarding suitability of potential sites for marina.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2002

Currentness_Reference: publication dates of source materials

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None Planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -77.52764987

East_Bounding_Coordinate: -75.55692881

North_Bounding_Coordinate: 38.92175804

South_Bounding_Coordinate: 36.69360465

Keywords:

Theme:

Theme_Keyword_Thesaurus: none

Theme_Keyword: Marina Siting

Theme_Keyword: Marina Developemnt

Place:

Place_Keyword_Thesaurus: none

Place_Keyword: Virginia

Place_Keyword: Chesapeake Bay

Access_Constraints: none

Use_Constraints:

This is a tool to assist with decision making at the local level. The product does not take into account local zoning policies and is not intended to replace or over ride such policies. The data do not replace the need for local site visitation.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Marcia Berman

Contact_Organization: Virginia Institute of Marine Science (VIMS)

Contact_Position: Director Comprehensive Coastal Inventory Program

Contact_Address:

Address_Type: mailing address

Address: P.O. Box 1346

City: Gloucester Point

State_or_Province: Virginia

Postal_Code: 23062

Country: USA

Contact_Voice_Telephone: (804) 684-7188

Contact_Facsimile_Telephone: (804) 684-7179

Contact_Electronic_Mail_Address: marcia@vims.edu

Data_Set_Credit:

Development of GIS model is the work of Tamia Rudnicky (CCI). An advisory board including Toni Watkinson (VMRC), Chip Neikirk (VMRC), Mark Slauter (DCR), Lewis Lawrence (MPPDC), Harrison Bresee (VA Sea Grant), and Scott Kaufman (Regent Point Marina) participated in the protocol development.

Native_Data_Set_Environment:

SunOS, 5.7, sun4u UNIX ARC/INFO version 7.2.1

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Assumptions were made that all data used for producing this coverage were accurate. Every effort was made to keep variables and items consistent by using amls to do the processing. Draft maps produced from this coverage and associated coverages were used to double check results.

Logical_Consistency_Report:

Polygon and chain-node topology present. The coverage was checked for dangles, misplaced arcs, and improperly labeled polygons. Where mistakes were found, corrections were made. Although the coverage was checked throughly, this does not guarantee that it is mistake free.

Completeness_Report:

All tidal shoreline included in the adopted digital shoreline coverage were analyzed for every parameter modeled.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Virginia Institute of Marine Science

Publication_Date: 1974-1988

Title: Tidal Marsh Inventory

Geospatial_Data_Presentation_Form: vector digital data

Publication_Information:

Publication_Place: Gloucester Point, Virginia

Publisher: Virginia Institute of Marine Science

Type_of_Source_Media: vector digital data

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1974

Ending_Date: 1988

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: TMI

Source_Contribution: wetlands data

Source_Information:

Source_Citation:

Citation_Information:

Originator: U.S. Geological Survey (USGS)

Publication_Date: 19990527

Title: Virginia Land Cover Data Set

Geospatial_Data_Presentation_Form: raster digital data

Publication_Information:

Publication_Place: Sioux Falls, SD USA

Publisher: U.S. Geological Survey

Type_of_Source_Media: vector digital data

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1986

Ending_Date: 1993

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: LU

Source_Contribution: attribute information

Source_Information:

Source_Citation:

Citation_Information:

Originator: Virginia Marine Resource Commision (VMRC)

Publication_Date: 2001

Title: Shellfish Condemnation Zones

Type_of_Source_Media: vector digital data

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2001

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: VMRC2

Source_Contribution: location of condemnation zones

Source_Information:

Source_Citation:

Citation_Information:

Originator: Chesapeake Bay Program Office, Data Center, GIS Team

Publication_Date: 1997

Title: Bathymetric one and two meter low water contours

Geospatial_Data_Presentation_Form: vector digital data

Publication_Information:

Publication_Place: Annapolis, MD

Publisher: US EPA Chesapeake Bay Program

Type_of_Source_Media: vector digital data

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1938

Ending_Date: 1938

Source_Currentness_Reference: ground conditions

Source_Citation_Abbreviation: BATH

Source_Contribution: location of 2m bathymetry line

Source_Information:

Source_Citation:

Citation_Information:

Originator: Virginia Institute of Marine Science

Publication_Date: 1991

Title: Mean High Water Shoreline Position, Virginia

Geospatial_Data_Presentation_Form: vector digital data

Publication_Information:

Publication_Place: Gloucester Point, Virginia

Publisher: Virginia Institute of Marine Science

Type_of_Source_Media: vector digital data

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1964

Ending_Date: 1987

Source_Currentness_Reference: date of USGS map

Source_Citation_Abbreviation: SHL

Source_Contribution: shoreline position

Source_Information:

Source_Citation:

Citation_Information:

Originator: Virginia Institute of Marine Science

Publication_Date: 2002

Title: Virginia Shoreline Exposure

Geospatial_Data_Presentation_Form: vector digital data

Publication_Information:

Publication_Place: Gloucester Point, Virginia

Publisher: Virginia Institute of Marine Science

Type_of_Source_Media: vector digital data

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1964

Ending_Date: 1987

Source_Currentness_Reference: date of USGS map

Source_Citation_Abbreviation: FETCH

Source_Contribution: distance to nearest shoreline

Process_Step:

Process_Description:

Virginia tidal shoreline (SHL) along tributaries to the western and eastern shores of the Chesapeake Bay were selected and buffered 30m inland and 200m seaward.

Process_Date: 2002

Process_Step:

Process_Description:

Shoreline segments 600 meters in length alongshore were produced. An existing coverage generated for computing shore exposure (FETCH) was the basis for this coverage. An aml was written to automate the process. Using ArcInfo on a UNIX workstation, the aml checks the direction of each arc, flipping arcs as needed. Arc segments are combined and unsplit to make new segments approximately 600m long. Arc nodes were converted to points. Using the NEAR command, arcs were drawn from these points to the nearest point on the landward 30m buffer arc. These short arcs were labeled 'dividers' in the .aat.

Process_Date: 2002

Process_Step:

Process_Description:

Stream centerlines were created in streams less than 400m wide. The THIESSEN command was used to generate many arcs. Any arc intersecting a 10m shoreline buffer was deleted. The remaining arcs were cleaned manually. The completed centerline coverage was combined with the 30_200m buffer coverage and the divider arcs. The divider arcs were extended to close the polygons. The polygons or 'windows' are the analytical blocks for the Marina Siting project.

Process_Date: 2002

Process_Step:

Process_Description:

Each polygon was examined for dangling arcs, missing divider arcs, and misplaced divider arcs. Polygons were coded for general location and for county.

Process_Date: 200205

Process_Step:

Process_Description:

Three coverages where created from the marina windows coverage representing the three major criteria categories in the marina siting suitability model; habitat, water quality, and design.

Process_Date: 2002

Process_Step:

Process_Description:

An AML was written to process the steps below. In most cases, the criteria coverage was identitied with the windows coverage. A frequency was run using the windows id and a key variable in the criteria coverage. Each windows polygon was analyzed to find the criteria and then coded appropriately.

Process_Date: 200205

Process_Step:

Process_Description:

The tidal marsh inventory (TMI) coverage was used to satisfy the wetlands criteria for the Habitat and Water Quality categories in the marina siting suitability model. Wetland types were put into groups as designated by the Wetland Guidelines. Each group was given a marina suitability ranking where 0 would be unsuitable and 6 would be highly suitable. Tidal freshwater communities were ranked "0", Group1 = 1, Group2 = 2, Group3 = 3, Group4 = 4, Group5 = 4, and absent(no wetlands) = 6. More than one wetland group could occur within an analytical 'window'. In such cases the tmiranksum was found by determining the percent of each group within the 'window', multiplying the percent by the rank, and then summing the ranks. The TMI coverage and the windows coverage were "identitied", the above analysis performed, and the resulting score for each polygon analyzed was transfered into the habitat and water quality coverages.

Process_Date: 200205

Process_Step:

Process_Description:

The Riparian forest scores were used in the habitat and the water quality suitability models and therefore show up in both coverages. A 30m shoreline buffer was used to clip the large landuse coverage (LU) into a manageable size for this project. Forested landuse includes conifer, deciduous, and mixed forests, as well as woody wetlands. These groups were dissolved into one forest category. The riparian ranking was determined by the percent of forest within the buffer zone in each analysis window. The ranking is as follows: 100-80.1% forested = 0; 80-60.1% forested = 1; 60-40.1% forested = 2; 40-20.1% forested = 3; 20-1.0% forested = 4; <1% forested = 5.

Process_Date: 200205

Process_Step:

Process_Description:

Shellfish condemnation zones (VMRC2) were used as one of the criteria for water quality. If no condemnation zones were present within an analysis polygon then the score = 0. If a condemnation zone was present and it was seasonally condemned, the rank = 4, if it was permanently condemned, the rank = 5.

Process_Date: 200205

Process_Step:

Process_Description:

To rank the dredging distance (a water quality and design criteria) to the 2m bathymetric contour (BATH), the shoreline needed to be buffered with several different widths. The five buffers were unioned, identitied with the bathymetry coverage, and finally overlaid with the windows coverage. Ranks were calculated using the lowest buffer distance to the bathmetry line as follows: distance

200m = 0; 200-150.1m = 1; 150-100.1m = 2; 100-50.1m = 3; 50-10m = 4;

<10m = 5. The closer the 2m bathymetric contour is to the shoreline the less likely dredging will be required which is a design benefit, and minimizes impacts to water quality.

Process_Date: 200205

Process_Step:

Process_Description:

Scores within each suitability coverage (habitat, water quality, and design) were summed. The summed scores where divided into three equal ranges and given the suitability ranking of low, moderate, and high. The three suitability coverages were then combined into one coverage, mrnafinal. The rankings of each category where summed (finalsumrank), divided into 3 groups, and assigned final rankings (finalrank). Any polygons within the habitat or final coverages that were tagged with the code '-98', were automatically given a low suitability ranking.

Process_Date: 200207

Process_Step:

Process_Description:

Twenty eight 1:100,000 scale map plates covering the tidal waters of Virgina were developed. Four maps (habitat, design, water quality, and final) where created in ArcGis for each plate. All maps will be served on the web. Additionally, the final maps will be presented in a hard copy report.

Process_Date: 200207

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Point

Point_and_Vector_Object_Count: 20280

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: String

Point_and_Vector_Object_Count: 86059

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains

Point_and_Vector_Object_Count: 20280

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: Universal Transverse Mercator

Universal_Transverse_Mercator:

UTM_Zone_Number: 18

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: .9996

Longitude_of_Central_Meridian: -75W

Latitude_of_Projection_Origin: 0.0

False_Easting: 500000

False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.8596090078353

Ordinate_Resolution: 0.8596090078353

Planar_Distance_Units: Meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: GRS1980

Semi-major_Axis: 6378206.4

Denominator_of_Flattening_Ratio: 294.98

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview:

Below is a listing of attributes found in this coverage. The first four items are ArcInfo generated. ID is a unique number used to identify polygons and join data. BUFFER contains a 'yes' if the polygon is part of the 200m offshore and 30m inland buffer. LOCATION holds a general description of where the polygon is located. COUNTY gives the County name. FORESTRANK2 contains the rank associated with the percent of forest within the analysis window: 100-80.1% forested = 0, 80-60.1% = 1, 60-40.1% = 2, 40-20.1% = 3, 20-1.0% = 4, and <1% = 5. and TMIRANKSUM2 holds the rank sum of the wetlands score for each polygon; a value between 0 - 6. CONRANK holds the ranking values for shellfish condemnation zones. If the zone is seasonally condemned the rank is 4, if the zone is permanently condemned the rank is 5, otherwise the rank is 0. DREDGRANK contains the score for dredging (or distance to the 2m bathymetric contour). If the distance is >200m the score is 0, 200-150.1m = 1, 150-100.1m - 2, 100-50.1 = 3, 50-10m = 4, and <10m = 5. WQSUMRANK is the sum of the values from FORESTRANK2, TMISUMRANK2, CONDRANK, and DREDGRANK. WQRANK contains suitability categories for water quality: low, moderate, and high.

MRNAWAT.PAT:

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
    1  AREA                   4    12     F      3
    5  PERIMETER              4    12     F      3
    9  MRNAWAT#               4     5     B      -
   13  MRNAWAT-ID             4     5     B      -
   17  ID                     4     5     B      -
   21  BUFFER                 4     4     C      -
   25  LOCATION              20    20     C      -
   45  COUNTY                20    20     C      -
   65  FORESTRANK2            8     8     F      2
   73  TMIRANKSUM2            8    18     F      6
   81  CONDRANK               8     8     F      2
   89  DREDGRANK              8     8     F      2
   97  WQSUMRANK              8     8     F      2
  105  WQRANK                 8     8     C      -


MRNAWAT.AAT:

COLUMN   ITEM NAME        WIDTH OUTPUT  TYPE N.DEC  ALTERNATE NAME
    1  FNODE#                 4     5     B      -
    5  TNODE#                 4     5     B      -
    9  LPOLY#                 4     5     B      -
   13  RPOLY#                 4     5     B      -
   17  LENGTH                 4    12     F      3
   21  MRNAWAT#               4     5     B      -
   25  MRNAWAT-ID             4     5     B      -
   29  WATER200BUF#           4     5     B      -
   33  WATER200BUF-ID         4     5     B      -
   37  SHLBUF10#              4     5     B      -
   41  AREA                   4    12     F      3
   45  PERIMETER              4    12     F      3
   49  SHLBUF10-ID            4     5     B      -
   53  INSIDE                 4     5     B      -
   57  LINETYPE              12    12     C      -

Entity_and_Attribute_Detail_Citation: none

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Virginia Institute of Marine Science (VIMS)

Contact_Position: Director Comprehensive Coastal Inventory Program

Contact_Address:

Address_Type: mailing address

Address: P.O. Box 1346

City: Gloucester Point

State_or_Province: Virginia

Postal_Code: 23062

Country: USA

Contact_Voice_Telephone: (804) 684-7188

Contact_Instructions: Contact via email

Contact_Electronic_Mail_Address: marcia@vims.edu

Distribution_Liability:

The Comprehensive Coastal Inventory Program (CCI) at VIMS performs a service by distributing data generated by either CCI or public agencies which offer data without restriction or charge. CCI assumes no responsibility for data accuracy or precision, metadata completeness or correctness for digital information. CCI assumes no liability for misuse of any data which may arise as a result of any alteration, conversion, or combination with other data sources. As well, the timeliness and scale of these products must be considered when evaluating appropriate use.

Metadata_Reference_Information:

Metadata_Date: 20021003

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Virginia Institute of Marine Science (VIMS)

Contact_Person: Tamia Rudnicky

Contact_Position: GIS Programmer/Analyst

Contact_Address:

Address_Type: mailing address

Address: P.O. Box 1346

City: Gloucester Point

State_or_Province: Virginia

Postal_Code: 23062

Country: USA

Contact_Voice_Telephone: (804) 684-7181

Contact_Facsimile_Telephone: (804) 684-7179

Contact_Electronic_Mail_Address: tamia@vims.edu

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