View In:   ArcGIS Online Map Viewer

Name: FEMA Base Flood Elevation

Display Field: DFIRM_ID

Type: Feature Layer

Geometry Type: esriGeometryPolyline

Description: This layer represents FEMA-designated flood hazard zones from the National Flood Hazard Layer (NFHL), derived from Flood Insurance Rate Maps (FIRMs). These zones define areas with different levels of flood risk, such as the 100-year (1% annual chance) and 500-year (0.2% annual chance) floodplains. To support floodplain management, insurance rating, and risk assessment by depicting areas of varying flood risk, as designated in official FEMA flood maps. This is a subset derived from FEMA data published 7-23-2024. Data DetailsData Type: Polygon Feature ClassGeometry Type: esriGeometryPolygonFeature Count: Varies by map extentCoordinate System: Web Mercator Auxiliary Sphere (EPSG: 3857), consistent with FEMA’s hosted services. This extracted data is converted to Missouri State Plane West (2403) for the City of Independence Missouri and surrounding region. Fields and Descriptions:Field Name Alias DescriptionOBJECTID OBJECTID Unique system-generated feature IDFLD_ZONE Flood Zone FEMA-designated flood hazard zone (e.g., AE, X, VE, A, etc.)ZONE_SUBTY Zone Subtype Describes specific subtype or conditions of the flood zoneSFHA_TF Special Flood Hazard "T" if the area is in a Special Flood Hazard Area, otherwise "F"STATIC_BFE Static BFE Base Flood Elevation (if available) in feetV_DATUM Vertical Datum Datum for elevation values, typically NAVD88 or NGVD29DEPTH Flood Depth Depth of flooding above ground in feet (if known)LEN_UNIT Length Units Measurement unit (e.g., "Feet")VELOCITY Velocity Flow velocity in feet per second (if modeled)AR_REVERT AR Revert Zone For Zone AR areas: revert zone designation (if applicable)BFE_REVERT BFE Revert BFE for AR Revert Zone (if applicable)DEP_REVERT Depth Revert Depth for AR Revert ZoneSOURCE_CIT Source Citation Abbreviation for the study that produced this dataDFIRM_ID DFIRM ID Digital FIRM identifierVERSION_ID Version ID Version of the flood mapping dataSHAPE Geometry Polygon geometry representing the flood zoneGFID FEMA Global Feature ID Unique FEMA identifierGlobalID Esri Global ID System-generated unique ID used for data relationshipsSHAPE.STArea() Shape Area Calculated area of the polygon (in map units)SHAPE.STLength() Shape Perimeter Perimeter of the polygon (in map units)Data Source:FEMAhttps://hazards.fema.gov/arcgis/rest/services/FIRMette/NFHLREST_FIRMette/MapServer/8

Service Item Id: 3e67de20ac1a4b609ba7d39cd4438c7c

Copyright Text: Federal Emergency Management Agency (FEMA) – Map Service Center Website: https://msc.fema.gov Contact: FEMA Map Information eXchange (FMIX) Phone: 1-877-FEMA-MAP (1-877-336-2627) Email: FEMAMapSpecialist@riskmapcds.com

Default Visibility: false

MaxRecordCount: 2000

Supported Query Formats: JSON, geoJSON, PBF

Min Scale: 30000.0

Max Scale: 0.0

Supports Advanced Queries: true

Supports Statistics: true

Can Scale Symbols: false

Use Standardized Queries: true

Supports ValidateSQL: true

Supports Calculate: true

Supports Datum Transformation: true

Extent:

XMin: -1.0582185520493716E7
YMin: 4664770.605846824
XMax: -1.0405595132735739E7
YMax: 4792567.125958265
Spatial Reference: 102100  (3857)  LatestVCSWkid(0)

Drawing Info:

Renderer:
Simple Renderer:
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Advanced Query Capabilities:

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Supports TrueCurve: true
Supports Returning Query Extent: true
Supports Query With Distance: true
Supports Sql Expression: true
Supports Query With ResultType: true
Supports Returning Geometry Centroid: false
Supports Binning LOD: false
Supports Query With LOD Spatial Reference: false

HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field:

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID, editable: false, nullable: false, defaultValue: null, modelName: OBJECTID )
• DFIRM_ID ( type: esriFieldTypeString, alias: DFIRM_ID, editable: true, nullable: true, length: 6, defaultValue: null, modelName: DFIRM_ID )
• VERSION_ID ( type: esriFieldTypeString, alias: VERSION_ID, editable: true, nullable: true, length: 11, defaultValue: null, modelName: VERSION_ID )
• BFE_LN_ID ( type: esriFieldTypeString, alias: BFE_LN_ID, editable: true, nullable: true, length: 32, defaultValue: null, modelName: BFE_LN_ID )
• ELEV ( type: esriFieldTypeDouble, alias: ELEV, editable: true, nullable: true, defaultValue: null, modelName: ELEV )
• LEN_UNIT ( type: esriFieldTypeString, alias: LEN_UNIT, editable: true, nullable: true, length: 16, defaultValue: null, modelName: LEN_UNIT )
• V_DATUM ( type: esriFieldTypeString, alias: V_DATUM, editable: true, nullable: true, length: 17, defaultValue: null, modelName: V_DATUM )
• SOURCE_CIT ( type: esriFieldTypeString, alias: SOURCE_CIT, editable: true, nullable: true, length: 21, defaultValue: null, modelName: SOURCE_CIT )
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• GlobalID ( type: esriFieldTypeGlobalID, alias: GlobalID, editable: false, nullable: false, length: 38, defaultValue: null, modelName: GlobalID )

Templates:

• Name: FEMA Base Flood Elevation
  Description:
  Prototype:
  SOURCE_CIT: null
  DFIRM_ID: null
  VERSION_ID: null
  BFE_LN_ID: null
  ELEV: null
  LEN_UNIT: null
  V_DATUM: null
  
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Sync Can Return Changes: false

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Edit Fields Info:

• Creation Date Field: created_date
• Creator Field: created_user
• Edit Date Field: last_edited_date
• Editor Field: last_edited_user

Supports Query With Historic Moment: false

Supports Coordinates Quantization: true

Supported Operations:   Query   Query Analytic   Calculate   Validate SQL   Generate Renderer   Return Updates   Iteminfo   Thumbnail   Metadata