Noise contours at Seymour Johnson Air Force Base are used to map the impact of aircraft operations on the surrounding environment. These contours represent areas affected by varying levels of noise, measured in decibels (dB). The contours help identify zones where noise levels exceed thresholds that may affect residential areas, schools, or other sensitive locations.<\/p>
For example, areas closer to the base or under frequent flight paths may experience higher noise levels, often exceeding 65 dB DNL, which is considered a significant threshold for noise impact. These maps are crucial for urban planning, zoning, and mitigating the effects of aircraft noise on local communities. They also guide decisions about land use compatibility and noise abatement strategies.<\/p>", "mapName": "Planning Department Map Image Services", "description": "Noise contours at Seymour Johnson Air Force Base are used to map the impact of aircraft operations on the surrounding environment. These contours represent areas affected by varying levels of noise, measured in decibels (dB). The contours help identify zones where noise levels exceed thresholds that may affect residential areas, schools, or other sensitive locations.For example, areas closer to the base or under frequent flight paths may experience higher noise levels, often exceeding 65 dB DNL, which is considered a significant threshold for noise impact. These maps are crucial for urban planning, zoning, and mitigating the effects of aircraft noise on local communities. They also guide decisions about land use compatibility and noise abatement strategies.", "copyrightText": "", "supportsDynamicLayers": true, "layers": [ { "id": 4, "name": "Noise Contours", "parentLayerId": -1, "defaultVisibility": true, "subLayerIds": null, "minScale": 0, "maxScale": 0, "type": "Feature Layer", "geometryType": "esriGeometryPolyline", "supportsDynamicLegends": true } ], "tables": [], "spatialReference": { "wkid": 102719, "latestWkid": 2264, "xyTolerance": 0.003280833333333333, "zTolerance": 8.0E-5, "mTolerance": 8.0E-5, "falseX": -121841900, "falseY": -93659000, "xyUnits": 3048.0060960121928, "falseZ": -100000, "zUnits": 10000, "falseM": -100000, "mUnits": 10000 }, "singleFusedMapCache": false, "initialExtent": { "xmin": 2278345.6649903175, "ymin": 542352.2480924471, "xmax": 2340158.0587378186, "ymax": 606964.3150913893, "spatialReference": { "wkid": 102719, "latestWkid": 2264, "xyTolerance": 0.003280833333333333, "zTolerance": 8.0E-5, "mTolerance": 8.0E-5, "falseX": -121841900, "falseY": -93659000, "xyUnits": 3048.0060960121928, "falseZ": -100000, "zUnits": 10000, "falseM": -100000, "mUnits": 10000 } }, "fullExtent": { "xmin": 2283707.838182807, "ymin": 560606.8300944716, "xmax": 2341715.1647532135, "ymax": 590172.5947817266, "spatialReference": { "wkid": 102719, "latestWkid": 2264, "xyTolerance": 0.003280833333333333, "zTolerance": 8.0E-5, "mTolerance": 8.0E-5, "falseX": -121841900, "falseY": -93659000, "xyUnits": 3048.0060960121928, "falseZ": -100000, "zUnits": 10000, "falseM": -100000, "mUnits": 10000 } }, "datesInUnknownTimezone": false, "minScale": 0, "maxScale": 0, "units": "esriFeet", "supportedImageFormatTypes": "PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP", "documentInfo": { "Title": "Noise Contours", "Author": "", "Comments": "", "Subject": "", "Category": "", "Version": "3.3.0", "AntialiasingMode": "Fast", "TextAntialiasingMode": "Force", "Keywords": "Noise,Contours,SJAFB,Air,Force,Base,Sound,Levels" }, "capabilities": "Map,Query,Data", "supportedQueryFormats": "JSON, geoJSON, PBF", "exportTilesAllowed": false, "referenceScale": 0.0, "datumTransformations": [ { "geoTransforms": [ { "wkid": 108190, "latestWkid": 108190, "transformForward": true, "name": "WGS_1984_(ITRF00)_To_NAD_1983" } ] }, { "geoTransforms": [ { "wkid": 108190, "latestWkid": 108190, "transformForward": false, "name": "WGS_1984_(ITRF00)_To_NAD_1983" } ] } ], "supportsDatumTransformation": true, "floorAwareMapProperties": { "defaultFloorFilterSettings": {"isEnabled": false} }, "archivingInfo": {"supportsHistoricMoment": false}, "supportsClipping": true, "supportsSpatialFilter": true, "supportsTimeRelation": true, "supportsQueryDataElements": true, "mapUnits": {"uwkid": 9003}, "maxRecordCount": 2000, "maxImageHeight": 4096, "maxImageWidth": 4096, "supportedExtensions": "", "serviceItemId": "1a919a14f6ab4ea8894e882956ffdd5e" }