Services Directory - NJ_FEMA_1Pct_Annual_Change_Flood_Hazard_Plus

NJ_FEMA_1Pct_Annual_Change_Flood_Hazard_Plus_3ft (Map Service)

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Current Version: 10.81

Service Description: To aid in planning purposes, a GIS layer mapping the recommended 3' above the existing 1% Annual Chance/100 year FEMA Floodplain was generated. The layer was generated using geospatial analysis on ArcMap. The A and AE zones were extracted from the FEMA FIRM layers (best available downloaded in 2020 and 2021). The existing elevation was extracted from the USGS NED 3m DEM (digital elevation model NAVD 88) along the FEMA mapped boundary. This elevation was incremented by 3 feet and extrapolated spatially outward using the ARCMAP Spatial Analyst EXPAND function. This adjusted elevation map was compared with the DEM to identify where it equated the terrain elevation. The area between this new boundary and the existing floodplain boundary was classified as the + 3ft zone, i.e., the area that would be inundated by 3' of additional flood height. The resulting map layer was then filtered using a 5x5 majority smoothing function to remove “salt and pepper” and smooth boundaries.

Map Name: Layers

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Layers:

NJ FEMA 1% Annual Change Flood Hazard + 3ft(0)

Tables:

Description: To aid in planning purposes, a GIS layer mapping the recommended 3' above the existing 1% Annual Chance/100 year FEMA Floodplain was generated. The layer was generated using geospatial analysis on ArcMap. The A and AE zones were extracted from the FEMA FIRM layers (best available downloaded in 2020 and 2021). The existing elevation was extracted from the USGS NED 3m DEM (digital elevation model NAVD 88) along the FEMA mapped boundary. This elevation was incremented by 3 feet and extrapolated spatially outward using the ARCMAP Spatial Analyst EXPAND function. This adjusted elevation map was compared with the DEM to identify where it equated the terrain elevation. The area between this new boundary and the existing floodplain boundary was classified as the + 3ft zone, i.e., the area that would be inundated by 3' of additional flood height. The resulting map layer was then filtered using a 5x5 majority smoothing function to remove “salt and pepper” and smooth boundaries.

Copyright Text: Rutgers Center for Remote Sensing and Spatial Analysis

Spatial Reference:
102100

Single Fused Map Cache: true

Capabilities: Map,TilesOnly,Tilemap

Tile Info:

Height: 256
Width: 256
DPI: 96
Levels of Detail: (# Levels: 24)

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Level ID: 23 [Start Tile, End Tile]

Format: Mixed
Compression Quality: 75
Origin:
Spatial Reference:
102100

Initial Extent:

Full Extent:

Min Scale: 2311162.0
Max Scale: 4660.0

Min LOD: 8
Max LOD: 16

Units: esriMeters

Supported Image Format Types: Mixed

Export Tiles Allowed: false
Max Export Tiles Count: 100000

Document Info:

Title: NJ FEMA 1Pct Annual Change Flood Hazard Plus 3ft
Author: ljmarxen_rutgers
Comments:
Subject: To aid in planning purposes for climate change, a GIS layer mapping the state recommended 3' above the existing 1% Annual Chance/100 year FEMA Floodplain was generated. The layer was generated using geospatial analysis on ArcMap.
Category:
Keywords: NJ, New Jersey, Flood Hazard, FEMA, Map