Tidal Wetlands Maps

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: NYS Department of State
Publication_Date: 1975
Title: Tidal Wetlands Maps
Edition: 1.0
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Stony Brook, NY 11794
Publisher: NYS Department of State, DCR
Online_Linkage: http://www.nysgis.state.ny.us/inventories/state.htm
Description:
Abstract:
The data set contains digital map and attribute information for tidal wetlands of the South Shore Estuary Reserve (SSER) on Long Island, New York. The wetland maps and their classifications are defined by Tidal Wetlands Act, Article 25 of the ECL, and are as follows: HM - High Marsh or Salt Meadow - The normal uppermost tidal wetland zone usually dominated by salt meadow grass. Spartina patens; and spike grass, Distichlis spicata. This zone is periodically flooded by spring and storm tides and is often vegetated by low vigor. Spartina alterniflora and Seaside lavender, Limonium carolinianum. Upper limits of this zone often include black grass, Juncus gerardi; chairmaker's rush, Scipus sp; marsh elder, Iva frutescens; and groundsel bush, Baccharis halimifolia. SM - Coastal Shoals, Bars and Mudflats - The tidal wetland zone that at high tide is covered by water, at low tide is exposed or is covered by water to a maximum depth of approximately one foot, and is not vegetated by low marsh cordgrass, Spartina alterniflora. IM - Intertidal Marsh - The vegetated tidal wetland zone lying generaly between average high and low tidal elevation. The predominant vegetation in this zone is low marsh cordgrass, Spartina alterniflora. FM - Coastal Fresh Marsh - The tidal wetland zone found primarily in the upper tidal limits of riverine systems where significant fresh water inflow dominates the tidal zone. Species normally associated with this zone include narrow leaved cattail, Typha angustifolia; the tall brackish water cordgrasses, Spartina pectinata and/or S. cynosuroides; and the more typical emergent fresh water species such as arrow arum, Peltandra; pickerel weed, Pondederia; and cutgrass, leersia. FC - Formerly Connected Marsh. DS - Dredge Spoil. LZ - Littoral Zone - The tidal wetlands zones that includes all lands under tidal waters not included in any other category and up to a depth of 10 feet. These areas were not digitized and not included as features in this data set.
Purpose:
To create an accurate tidal wetlands coverage and to perform a tidal wetland trend analysis as the first step in identifying potential tidal wetland restoration projects.
Supplemental_Information:
The original materials are mylar hardcopies of non-rectified photography with overlying wetland delineations that were prepared by Earth Satellite Corporation-Mark Hurd Aerial Surveys, Inc. from color infrared photographs taken in 1974 to implement the Tidal Wetlands Act. Hard copies were made by enlarging the aerial photos from 1 inch = 1000 feet and best fitting its position and scale to New York State Department of Transportation 7.5 minute planimetric maps at a scale of 1 inch = 2000 feet. Each copy, 2,000m x 2,000m, is identified with a six digit New York Transverse Mercator coordinate, e.g. 600-526 (600 is 600,000 and 526 is 4,526,000). The stated scale is 1:2400, however sheets were not subject to aerial triangulation and scale variances are known to occur within original data. Paper copies of the mylar originals held by Department of State were used to digitize the wetland features. Scale:
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19740810
Ending_Date: 19741009
Currentness_Reference: 1974
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: 606,000
East_Bounding_Coordinate: 702,000
North_Bounding_Coordinate: 4,520,000
South_Bounding_Coordinate: 4,492,000
Keywords:
Theme:
Theme_Keyword_Thesaurus: NYS GIS Clearinghouse categories
Theme_Keyword: wetlands
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword:
Place:
Place_Keyword_Thesaurus: None
Place_Keyword:
South Shore Estuary, Long Island, Hempstead, Oyster Bay, Babylon, Islip Brookhaven, Southampton
Access_Constraints: None
Use_Constraints: None
Browse_Graphic:
Browse_Graphic_File_Name:
Browse_Graphic_File_Description:
Browse_Graphic_File_Type: selected
Native_Data_Set_Environment:
MapInfo tables created under a Windows NT operating system using MapInfo version 5.0. The file path is G:\GIS\Projects\SSER\Wetlands_Draft\Wetlands_Complete. File size is 7.79MB in MapInfo format. File size is 33.0MB in ArcInfo e00 format.

Data_Quality_Information:
Logical_Consistency_Report:
Data set was checked for errors with MapInfo Object Check version 3.0 and all errors were corrected. A copy of the data set was converted to ArcInfo using the ArcLink conversion application from MapInfo. All errors reported during conversion were corrected in the original MapInfo tables and then re-exported until no errors were reported.
Completeness_Report:
The data set excludes Littoral Zone features. Lines corresponding to littoral zones were not digitized as these corresponded to shoreline, elevations and open water areas. More accurate shorelines and elevations are available as parts of other data sets and was not deemed worth the effort to collect. Similarly, open water lines reflect a regulatory extent related to the Tidal Wetlands Act related to water depth which is also available from more accurate data sources. There were cases in the Tidal Wetland sheets where the line work representing a particular feature was absent. In most cases, the omission occurred in areas between adjacent sheets. The digitizer technician would connect appropriate features, using a 1994 orthophotographic dataset as reference. In a few cases, classification of features did not match features from adjacent sheets. Proper classification was determined by professional staff at DOS Division of Coastal Resources. Lastly, there were instances where large areas of Shoal and Mudflat (SM) were absent from one Tidal Wetland sheets, but included on the adjacent sheet. Rather than create an arbitrary line to continue the feature, the feature was ended at the boundary line between the respective sheets.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: Better than plus or minus 10 feet for well-defined features
Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value: 10 feet
Horizontal_Positional_Accuracy_Explanation:
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Quantitative_Vertical_Positional_Accuracy_Assessment:
Vertical_Positional_Accuracy_Value:
Vertical_Positional_Accuracy_Explanation:
Lineage:
Process_Step:
Process_Description:
Paper copies of tidal wetland sheets were digitized using the coordinate marks on each sheet for registration points. As these sheets are not true maps having consistent scale due to the unrectified photography on which the wetland features were delineated, the registration points were accurately marked and used regardless of the reported MSE. This allowed for accurate capture of the geometry of wetland features which were then rubber-sheeted against an accurate orthophotography reference base. Only unchanged features between the 1974 and 1994 time periods of the two data sets were used to correctly locate the linework in the tidal wetlands data. After each wetland sheet was digitized, the line work from adjacent sheets were connected and all line work was converted to polygons. Each original wetlands sheet was then appended to a "wetlands_complete" table. All adjacent polygons initially falling across sheet boundaries were combined and the browser was updated to include acreage of each feature.
Process_Date: 19990514

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method:

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Local:
Local_Description: other system
Local_Georeference_Information:
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.98

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NYS Department of State, Division of Coastal Resources
Contact_Position: Jeffrey L. Herter
Contact_Address:
Address_Type: mailing and physical address
Address: 41 State Street
City: Albany
State_or_Province: NY
Postal_Code: 12231-0001
Country: USA
Contact_Voice_Telephone: 518-486-7942
Contact_Facsimile_Telephone: 518-473-2464
Contact_Electronic_Mail_Address: jherter@dos.state.ny.us
Resource_Description:
Distribution_Liability:
Under no circumstances shall the creators, custodians, or distributors of this information be liable for any damages arising out of its use (or inability to use it).
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name:
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
Fees:

Metadata_Reference_Information:
Metadata_Date: 20001030
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Rod McNeil
Contact_Address:
Address_Type: mailing and physical address
Address: 41 State Street
City: Albany
State_or_Province: NY
Postal_Code: 12231
Country: USA
Contact_Voice_Telephone: 518-486-7942
Contact_Facsimile_Telephone: 518-473-2464
Contact_Electronic_Mail_Address: rmcneil@dos.state.ny.us
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

Generated by mp version 2.2.3 on Mon Nov 26 16:57:26 2001