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Evocative landscapes are places possessing a feeling that expresses the aesthetic or historic sense of a particular period of time. This feeling results from the presence of physical features that, taken together, convey a landscape's historic character. For example, landscapes that generally relate the feeling of the early 19th centurly landscape in the Chesapeake Bay Region - or that are \"evocative\" of that landscape - would be those that are generally free from intrusion by the sights, sounds, and smells of modern development. <\/SPAN><\/P>

The evocative landscape layer was created based on the viewshed analysis conducted and available land cover data. Using the raster calculator in spatial analyst, the two layers were added together to determine areas of forest or wetlands visible from the Star-Spangled Banner routes. Assumptions: -Tree cover was accounted for by adding an additional 50' to the elevation data -Observation point elevation: water surface elevation + 6' -Line of sight: 3.29 miles (distance to horizon based on 6' observation point-calculated on the National Geospatial Agency website) GIS layers and data sources used to create the model: -National Elevation Dataset (USGS 1-Arc Second NED) -Tree Cover Virginia: 2005 Virginia Forest Cover (VA Department of Forestry) -Tree Cover Maryland: Maryland Department of Planning 2002 Land Use/Land cover -Wetlands (NWI May 2009 Statewide Shapefiles) - Star-Spangled Banner Routes (NPS) <\/SPAN><\/P><\/DIV><\/DIV><\/DIV>", "geometryType": "esriGeometryPolygon", "sourceSpatialReference": { "wkid": 102685, "latestWkid": 2248, "xyTolerance": 0.003280833333333333, "zTolerance": 0.001, "mTolerance": 0.001, "falseX": -120561100, "falseY": -95444400, "xyUnits": 3048.0060960121928, "falseZ": -100000, "zUnits": 10000, "falseM": 0, "mUnits": 1 }, "copyrightText": "Star-Spangled Banner National Historic Trail National Park Service Chesapeake Bay Office\n410 Severn Avenue, Suite 314\nAnnapolis, MD 21403", "parentLayer": null, "subLayers": [], "minScale": 0, "maxScale": 0, "referenceScale": 0.0, "drawingInfo": { "renderer": { "type": "simple", "symbol": { "type": "esriSFS", "style": "esriSFSBackwardDiagonal", "color": [ 255, 170, 0, 255 ], "outline": { "type": "esriSLS", "style": "esriSLSSolid", "color": [ 255, 170, 0, 255 ], "width": 0.4 } } }, "scaleSymbols": true, "transparency": 0, "labelingInfo": null }, "defaultVisibility": true, "extent": { "xmin": 1397535.7909019738, "ymin": 238054.74330356717, "xmax": 1489916.110406056, "ymax": 397267.0833428055, "spatialReference": { "wkid": 102685, "latestWkid": 2248, "xyTolerance": 0.003280833333333333, "zTolerance": 2, "mTolerance": 0.001, "falseX": -1.2666547118760788E8, "falseY": -1.0023670427655995E8, "xyUnits": 3.605024385878621E7, "falseZ": 0, "zUnits": 1, "falseM": -100000, "mUnits": 10000 } }, "hasAttachments": false, "htmlPopupType": "esriServerHTMLPopupTypeAsHTMLText", "displayField": "ID", "typeIdField": null, "subtypeFieldName": null, "subtypeField": null, "defaultSubtypeCode": null, "fields": [ { "name": "OBJECTID", "type": "esriFieldTypeOID", "alias": "OBJECTID", "domain": null }, { "name": "ID", "type": "esriFieldTypeDouble", "alias": "ID", "domain": null }, { "name": "GRIDCODE", "type": "esriFieldTypeDouble", "alias": "GRIDCODE", "domain": null }, { "name": "Shape", "type": "esriFieldTypeGeometry", "alias": "Shape", "domain": null }, { "name": "Shape_Length", "type": "esriFieldTypeDouble", "alias": "Shape_Length", "domain": null }, { "name": "Shape_Area", "type": "esriFieldTypeDouble", "alias": "Shape_Area", "domain": null } ], "geometryField": { "name": "Shape", "type": "esriFieldTypeGeometry", "alias": "Shape" }, "indexes": [ { "name": "FDO_OBJECTID", "fields": "OBJECTID", "isAscending": true, "isUnique": true, "description": "" }, { "name": "FDO_Shape", "fields": "Shape", "isAscending": true, "isUnique": false, "description": "" } ], "subtypes": [], "relationships": [], "canModifyLayer": true, "canScaleSymbols": false, "hasLabels": false, "capabilities": "Map,Query,Data", "maxRecordCount": 2000, "supportsStatistics": true, "supportsExceedsLimitStatistics": true, "supportsAdvancedQueries": true, "supportedQueryFormats": "JSON, geoJSON, PBF", "isDataVersioned": false, "ownershipBasedAccessControlForFeatures": {"allowOthersToQuery": true}, "useStandardizedQueries": true, "supportedSpatialRelationships": [ "esriSpatialRelIntersects", "esriSpatialRelContains", "esriSpatialRelCrosses", "esriSpatialRelEnvelopeIntersects", "esriSpatialRelIndexIntersects", "esriSpatialRelOverlaps", "esriSpatialRelTouches", "esriSpatialRelWithin", "esriSpatialRelRelation" ], "advancedQueryCapabilities": { "useStandardizedQueries": true, "supportsStatistics": true, "supportsPercentileStatistics": true, "supportsHavingClause": true, "supportsOrderBy": true, "supportsDistinct": true, "supportsCountDistinct": true, "supportsPagination": true, "supportsLod": false, "supportsQueryWithLodSR": false, "supportsTrueCurve": true, "supportsQueryWithDatumTransformation": true, "supportsReturningQueryExtent": true, "supportsQueryWithDistance": true, "supportsSqlExpression": true, "supportsTimeRelation": true, "supportsSqlFormat": false, "supportsQueryAnalytic": false }, "supportsDatumTransformation": true, "dateFieldsTimeReference": null, "preferredTimeReference": null, "datesInUnknownTimezone": false, "hasGeometryProperties": true, "geometryProperties": { "shapeAreaFieldName": "Shape_Area", "shapeLengthFieldName": "Shape_Length", "units": "esriFeet", "mapUnits": {"uwkid": 9003} }, "hasMetadata": true, "isDataArchived": false, "archivingInfo": { "supportsQueryWithHistoricMoment": false, "startArchivingMoment": -1 }, "supportsCoordinatesQuantization": true, "supportsDynamicLegends": true, "serviceItemId": "458a5d18a4fc4d1b80a361c9df17800c" } ], "tables": [] }