20200211 16531700 1.0 FGDC CSDGM Metadata FALSE NOAA_OCM_Flood_Frequency 2265048.581497 3718416.049377 12398033.232853 14038529.830861 1 002 Projected GCS_North_American_1983 Linear Unit: Foot_US (0.304801) NAD_1983_StatePlane_Texas_South_Central_FIPS_4204_Feet <ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/10.7'><WKT>PROJCS[&quot;NAD_1983_StatePlane_Texas_South_Central_FIPS_4204_Feet&quot;,GEOGCS[&quot;GCS_North_American_1983&quot;,DATUM[&quot;D_North_American_1983&quot;,SPHEROID[&quot;GRS_1980&quot;,6378137.0,298.257222101]],PRIMEM[&quot;Greenwich&quot;,0.0],UNIT[&quot;Degree&quot;,0.0174532925199433]],PROJECTION[&quot;Lambert_Conformal_Conic&quot;],PARAMETER[&quot;False_Easting&quot;,1968500.0],PARAMETER[&quot;False_Northing&quot;,13123333.33333333],PARAMETER[&quot;Central_Meridian&quot;,-99.0],PARAMETER[&quot;Standard_Parallel_1&quot;,28.38333333333333],PARAMETER[&quot;Standard_Parallel_2&quot;,30.28333333333333],PARAMETER[&quot;Latitude_Of_Origin&quot;,27.83333333333333],UNIT[&quot;Foot_US&quot;,0.3048006096012192],AUTHORITY[&quot;EPSG&quot;,2278]]</WKT><XOrigin>-126725700</XOrigin><YOrigin>-77828800</YOrigin><XYScale>34994581.165044695</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>0.0032808333333333331</XYTolerance><ZTolerance>0.00020000000000000001</ZTolerance><MTolerance>0.00020000000000000001</MTolerance><HighPrecision>true</HighPrecision><WKID>102740</WKID><LatestWKID>2278</LatestWKID></ProjectedCoordinateSystem> 20200212 10495700 20200212 10495700 150000000 5000 FGDC SDE_VAT_74 Table 1 OBJECTID OBJECTID OID 4 10 0 Internal feature number. Esri Sequential unique whole numbers that are automatically generated. Value Value Integer 4 10 0 Count_ Count_ Double 8 38 8 NOAA Office for Coastal Management 843-740-1202 2234 South Hobson Avenue Charleston SC 29405-2413 coastal.info@noaa.gov 20160801 ArcGIS Metadata 1.0 NOAA Office for Coastal Management 843-740-1202 2234 South Hobson Ave. Charleston SC 29405-2413 coastal.info@noaa.gov This data may be downloaded at: http://www.csc.noaa.gov/slr https://www.coast.noaa.gov/slr https://www.coast.noaa.gov https://coast.noaa.gov/digitalcoast/tools/slr https://coast.noaa.gov/slrdata Raster Dataset NOAA_OCM_Flood_Frequency 2012-01-01 NOAA's Ocean Service, Office for Coastal Management (OCM) Charleston, SC Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS), Office for Coastal Management (OCM) <DIV STYLE="text-align:Left;"><DIV><P><SPAN>These data were created as part of the National Oceanic and Atmospheric Administration Office for Coastal Management's efforts to create an online mapping viewer depicting potential sea level rise and its associated impacts on the nation's coastal areas. The purpose of the mapping viewer is to provide coastal managers and scientists with a preliminary look at sea level rise (slr) and coastal flooding impacts. The viewer is a screening-level tool that uses nationally consistent data sets and analyses. Data and maps provided can be used at several scales to help gauge trends and prioritize actions for different scenarios. The Sea Level Rise and Coastal Flooding Impacts Viewer may be accessed at: https://www.coast.noaa.gov/slr These data depict the potential inundation extent of coastal areas resulting from National Weather Service issued Coastal Flood Advisories. The Coastal Flood Advisory areas are based on individual Weather Forecast Office (WFO) guidance thresholds at monitored tide stations and are referenced to the MLLW tidal datum. The process used to produce the data can be described as a modified bathtub approach that attempts to account for both local/regional tidal variability. The process uses either two or three source datasets depending on geographic location to derive the final inundation rasters: the Digital Elevation Model (DEM) of the area, a tidal surface model that represents spatial tidal variability, and an interpolated threshold surface if there is significant difference between flooding thresholds between varying geographic areas (Ex: Chesapeake Bay area). The tidal model is created using the NOAA National Geodetic Survey's VDATUM datum transformation software (http://vdatum.noaa.gov) in conjunction with spatial interpolation/extrapolation methods and represents the MLLW tidal datum in orthometric values (North American Vertical Datum of 1988).The interpolated threshold surface is created using the flooding threshold values found at select NOAA tide gages used by the NWS to define flooding events. The methods used to produce these data does not account for erosion, subsidence, or any future changes in an area's hydrodynamics. It is simply a method to derive data in order to visualize the potential scale and extent, not exact location, of inundation from NWS issued Coastal Flood Advisories.</SPAN></P></DIV></DIV> The purpose of these data is to show the potential inundation extent caused by NWS issued Coastal Flood Advisories. Acknowledgment of the NOAA Office for Coastal Management as a data source would be appreciated in products developed from these data, and such acknowledgment as is standard for citation and legal practices for data source is expected. NOAA Office for Coastal Management 843-740-1202 2234 South Hobson Ave. Charleston SC 29405-2413 coastal.info@noaa.gov United States ISO 19115 Topic Category climatologyMeteorologyAtmosphere environment Bathymetry/Topography elevation sea level rise oceans flooding Shoreline inundation environment Bathymetry/Topography elevation climatologyMeteorologyAtmosphere sea level rise oceans flooding Shoreline inundation United States Any conclusions drawn from the analysis of this information are not the responsibility of the Office for Coastal Management or its partners. <DIV STYLE="text-align:Left;"><DIV><P><SPAN>These data illustrate the scale of potential flooding, not the exact location, and do not account for erosion, subsidence, or future construction. Inundation is shown as it may appear during Coastal Flood Advisory conditions. These data should be used only as a screening-level tool for management decisions. As with all remotely sensed data, all features should be verified with a site visit. The dataset is provided "as is," without warranty to its performance, merchantable state, or fitness for any particular purpose. The entire risk associated with the results and performance of this dataset is assumed by the user. This dataset should be used strictly as a planning reference and not for navigation, permitting, or other legal purposes.</SPAN></P></DIV></DIV> The dataset is derived from the most recent elevation, coastal flood thresholds provided by WFO's, and VDATUM data available at date of processing. 2012-01-01 2016-01-01 -160.74 -65.097 17.75 49.276 A detailed methodology for producing these data can be found via the following url: https://coast.noaa.gov/data/digitalcoast/pdf/slr-flood-frequency-methods.pdf Version 6.2 (Build 9200) ; Esri ArcGIS 10.7.1.11595 1 -98.099944 -93.456690 30.346950 25.730737 Standard methods for determining inundation were used. The vertical accuracy of these data is dependent on the source elevation data and the error associated with vertical datum conversions within NOAA's VDatum software. The Flood Frequency inundation extent areas currently shown in the NOAA CSC Sea Level Rise and Coastal Flooding Impacts Viewer. The current status of areas of coverage for the tool can be accessed at: http://www.csc.noaa.gov/slr The digital elevation model (DEM) of an area serves as one of two source datasets used to derive inundation outputs. NOAA OCM Digital Elevation Models CSC DEMs 2016-01-01 NOAA Office for Coastal Management https://www.coast.noaa.gov/slr The dataset is derived from the most recent elevation available at date of processing. 2012-20-16 The tidal conversion surface of an area serves as one of two source datasets used to create the inundation outputs and is derived from NOAA National Geodetic Survey's VDATUM software. NOAA OCM VDATUM Tidal Surface Models OCM VDATUM Tidal Surfaces 2016-01-01 NOAA Office for Coastal Management http://vdatum.noaa.gov The dataset is derived from the most recent VDATUM data available at date of processing. 2012-20-16 The process to derive the inundation rasters is as follows: 1. A tidal surface is generated using NOAA VDATUM tool and various spatial interpolation/extrapolation routines, dependent upon the area being mapped. The surface generated represents the spatial variability of offsets between MLLW, a tidal datum and NAVD88, an orthometric datum. 2. Using the DEM and the tidal surface, raster calculations are made using ArcGIS Spatial Analyst Raster Calculation tool to generate one 8-bit single value raster representing the extent of inundation. 3. If necessary, an additional flood threshold surface is created using spatial interpolation techniques to capture the variability between flooding thresholds within large geographic locations. This interpolated threshold surface is then added to the MLLW VDatum tidal surface to create a total water surface layer referenced to the MLL tidal datum. 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