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Mean and standard deviation of density at surface minus the density at 20 meters (or bottom, whichever is shallower), divided by the difference in depth between the two observations.", "geometryType": null, "copyrightText": "University of Massachusetts-Dartmouth School for Marine Science and Technology (SMAST), Woods Hole Oceanographic Institution (WHOI), RPS Applied Science Associates (RPS ASA)", "parentLayer": { "id": 21, "name": "Physical Habitat" }, "subLayers": [], "minScale": 0, "maxScale": 0, "defaultVisibility": false, "extent": { "xmin": -8425141.521908043, "ymin": 4202474.572722437, "xmax": -6328359.512545391, "ymax": 5803756.043704423, "spatialReference": { "wkid": 102100, "latestWkid": 3857 } }, "hasAttachments": false, "htmlPopupType": "esriServerHTMLPopupTypeNone", "displayField": "", "typeIdField": null, "fields": null, "indexes": [], "relationships": [], "canModifyLayer": false, "canScaleSymbols": false, "hasLabels": false, "capabilities": "Map,Query", "supportsStatistics": false, "supportsAdvancedQueries": false, "supportedQueryFormats": "JSON, AMF, geoJSON", "ownershipBasedAccessControlForFeatures": {"allowOthersToQuery": true}, "useStandardizedQueries": true, "advancedQueryCapabilities": { "useStandardizedQueries": true, "supportsStatistics": false, "supportsOrderBy": false, "supportsDistinct": false, "supportsPagination": false, "supportsTrueCurve": false, "supportsReturningQueryExtent": true, "supportsQueryWithDistance": true } }, { "currentVersion": 10.41, "id": 29, "name": "Biological Habitat", "type": "Group Layer", "description": "", "geometryType": null, "copyrightText": "", "parentLayer": null, "subLayers": [ { "id": 30, "name": "Eelgrass Meadows" }, { "id": 79, "name": "Historical Eelgrass Extent" }, { "id": 31, "name": "Shellfish Habitat" }, { "id": 32, "name": "Coastal Wetlands " }, { "id": 33, "name": "Primary Production" }, { "id": 34, "name": "Chlorophyll-a Winter (median)" }, { "id": 35, "name": "Chlorophyll-a Spring (median)" }, { "id": 36, "name": "Chlorophyll-a Summer (median)" }, { "id": 37, "name": "Chlorophyll-a Fall (median)" }, { "id": 38, "name": "Calanus finmarchicus, Spring" }, { "id": 39, "name": "Calanus finmarchicus, Fall" }, { "id": 40, "name": "Euphausiids, Fall" }, { "id": 41, "name": "Euphausiids, Spring" }, { "id": 42, "name": "Gammarid amphipods, Fall" }, { "id": 43, "name": "Gammarid amphipods, Spring" }, { "id": 44, "name": "Mysid shrimp, Fall" }, { "id": 45, "name": "Mysid shrimp, Spring" }, { "id": 46, "name": "Moon Snail Average Abundance" }, { "id": 47, "name": "Hermit Crab Average Abundance" }, { "id": 48, "name": "Seastar Average Abundance" }, { "id": 49, "name": "Bryozoans or Hydrozoans Average percent of samples" }, { "id": 50, "name": "Sand Dollars Average percent of samples" }, { "id": 51, "name": "Sponges Average percent of samples" } ], "minScale": 0, "maxScale": 0, "defaultVisibility": false, "extent": { "xmin": -8681664.669114687, "ymin": 3954607.8630406666, "xmax": -7030664.669114687, "ymax": 6065807.863040667, "spatialReference": { "wkid": 102100, "latestWkid": 3857 } }, "hasAttachments": false, "htmlPopupType": "esriServerHTMLPopupTypeNone", "displayField": "", "typeIdField": null, "fields": null, "indexes": [], "relationships": [], "canModifyLayer": false, "canScaleSymbols": false, "hasLabels": false, "capabilities": "Map,Query", "supportsStatistics": false, "supportsAdvancedQueries": false, "supportedQueryFormats": "JSON, AMF, geoJSON", "ownershipBasedAccessControlForFeatures": {"allowOthersToQuery": true}, "useStandardizedQueries": true, "advancedQueryCapabilities": { "useStandardizedQueries": true, "supportsStatistics": false, "supportsOrderBy": false, "supportsDistinct": false, "supportsPagination": false, "supportsTrueCurve": false, "supportsReturningQueryExtent": true, "supportsQueryWithDistance": true } }, { "currentVersion": 10.41, "id": 30, "name": "Eelgrass Meadows", "type": "Feature Layer", "description": "Eelgrass (Zostera marina) meadows are critical wetlands components of shallow coastal ecosystems throughout the region. Eelgrass meadows provide food and cover for a great variety of commercially and recreationally important fauna and their prey. Eelgrass and other seagrasses are often referred to as \"Submerged Aquatic Vegetation\" or SAV. This distinguishes them from algae, which are not classified as \"plants\" by biologists (rather they are often placed in the kingdom protista), and distinguishes them from the \"emergent\" saltwater plants found in salt marshes. In addition to the term SAV, some coastal managers use the term SRV or submerged rooted vegetation. The Eelgrass Meadows layer was created from several separate datasets for the states of Maine, New Hampshire, Massachusetts, Rhode Island, Connecticut, and New York. Where possible, polygon datasets depicting the most recent eelgrass surveys were used. Attributes with common themes for each dataset were integrated in order to better represent eelgrass density and year sampled. The data user is encouraged to read this and the metadata of each individual state\u2019s data carefully, as geometry, attribute details, and timeliness are not necessarily consistent among datasets used to develop this layer. Details of each state\u2019s data source are described in the data processing section of the metadata. Note that the eelgrass distribution data is presence-only. Because surveys of eelgrass do not encompass all coastal waters, absence of eelgrass in a particular place on the map does not necessarily mean that eelgrass does not live at that location.", "geometryType": "esriGeometryPolygon", "copyrightText": "This data was compiled by the Northeast Ocean Data Portal using datasets from the Maine Departments of Marine Resources and Environmental Protection, University of New Hampshire, New Hampshire Department of Environmental Services, Piscataqua Region Estuary Partnership, NH GRANIT (New Hampshire Geographically Referenced Analysis and Information Transfer System), Massachusetts Department of Environmental Protection, Massachusetts Division of Marine Fisheries, MassGIS, Rhode Island Eelgrass Task Force, RIGIS, Connecticut Department of Energy and Environmental Protection, Peconic Estuary Partnership, and New York Natural Heritage Program, New York State Department of Environmental Conservation", "parentLayer": { "id": 29, "name": "Biological Habitat" }, "subLayers": [], "minScale": 0, "maxScale": 0, "drawingInfo": { "renderer": { "type": "simple", "symbol": { "type": "esriSFS", "style": "esriSFSSolid", "color": [ 0, 168, 132, 255 ], "outline": { "type": "esriSLS", "style": "esriSLSSolid", "color": [ 0, 168, 132, 255 ], "width": 0.4 } }, "label": "", "description": "" }, "transparency": 0, "labelingInfo": null }, "defaultVisibility": false, "extent": { "xmin": -8180878.375689247, "ymin": 4954660.727300003, "xmax": -7455761.240089242, "ymax": 5636837.796599998, "spatialReference": { "wkid": 102100, "latestWkid": 3857 } }, "hasAttachments": false, "htmlPopupType": "esriServerHTMLPopupTypeAsHTMLText", "displayField": "state", "typeIdField": null, "fields": [ { "name": "OBJECTID", "type": "esriFieldTypeOID", "alias": "OBJECTID", "domain": null }, { "name": "Shape", "type": "esriFieldTypeGeometry", "alias": "Shape", "domain": null }, { "name": "state", "type": "esriFieldTypeString", "alias": "State", "length": 5, "domain": null }, { "name": "Shape_Length", "type": "esriFieldTypeDouble", "alias": "Shape_Length", "domain": null }, { "name": "Shape_Area", "type": "esriFieldTypeDouble", "alias": "Shape_Area", "domain": null }, { "name": "year", "type": "esriFieldTypeString", "alias": "year", "length": 4, "domain": null }, { "name": "sav", "type": "esriFieldTypeString", "alias": "sav", "length": 50, "domain": null }, { "name": "acres", "type": "esriFieldTypeDouble", "alias": "acres", "domain": null } ], "indexes": [ { "name": "FDO_OBJECTID", "fields": "OBJECTID", "isAscending": true, "isUnique": true, "description": "" }, { "name": "FDO_Shape", "fields": "Shape", "isAscending": true, "isUnique": false, "description": "" } ], "relationships": [], "canModifyLayer": false, "canScaleSymbols": false, "hasLabels": false, "capabilities": "Map,Query,Data", "maxRecordCount": 1000, "supportsStatistics": true, "supportsAdvancedQueries": true, "supportedQueryFormats": "JSON, AMF, geoJSON", "ownershipBasedAccessControlForFeatures": {"allowOthersToQuery": true}, "useStandardizedQueries": true, "advancedQueryCapabilities": { "useStandardizedQueries": true, "supportsStatistics": true, "supportsOrderBy": true, "supportsDistinct": true, "supportsPagination": true, "supportsTrueCurve": true, "supportsReturningQueryExtent": true, "supportsQueryWithDistance": true } }, { "currentVersion": 10.41, "id": 79, "name": "Historical Eelgrass Extent", "type": "Feature Layer", "description": "The purpose of mapping historical eelgrass extent is to create a reference layer depicting areas where eelgrass was present in the past and/or could be present again in the future throughout coastal New England waters. The historical eelgrass extent layer was created from several separate datasets for the states of Maine, New Hampshire, Massachusetts, Rhode Island, Connecticut, and New York. Datasets that were included in the historical layer were derived from quantitative surveys such as aerial photography and/or field verification. The range of historical data available varied greatly by state. The data user is encouraged to read this and the metadata of each individual state\u2019s data carefully, as geometry, attribute details, and timeliness are not necessarily consistent among datasets used to develop this layer. All of the datasets used to develop the historical eelgrass extent layer are available separately for download at https://www.northeastoceandata.org/eelgrass/<\/a>.\n
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