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These data, covering the full coastal area of Massachusetts, 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 (SLR) and its associated impacts on the nation's coastal areas.
The purpose of the Sea Level Rise and Coastal Flooding Impacts Viewer is to provide coastal managers and scientists with a preliminary look at sea level rise and coastal flooding impacts.
These polygon data depict the potential sea level rise inundation of coastal areas resulting from a projected 1 to 10 feet rise in sea level above current Mean Higher High Water (MHHW) conditions. Although the water surface mapped represents a particular increase in sea level in feet above MHHW, the actual cell values in NOAA's original raster data represent depth in meters.
The layer name for the SLR inundation data is NOAA_SLR_MA_POLY.
The process NOAA used to produce the SLR inundation data can be described as a modified "bathtub approach" that attempts to account for both local/regional tidal variability as well as hydrological connectivity. The process uses two source datasets to derive the final inundation rasters and polygons and accompanying low-lying polygons for each iteration of sea level rise: the Digital Elevation Model (DEM) of the area and a tidal surface model that represents spatial tidal variability. The tidal model is created using the NOAA National Geodetic Survey's VDATUM datum transformation software in conjunction with spatial interpolation/extrapolation methods and represents the MHHW tidal datum in orthometric values (North American Vertical Datum of 1988).
The model 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, not exact location, of inundation from sea level rise.
See NOAA's detailed methodology for producing these data.
MassGIS downloaded all the data from https://coast.noaa.gov/slrdata/ and combined the separate inundation polygon feature classes into one feature class that contains no overlap. The processing included Dice (for faster drawing speed), Dissolve, Union, and field calculations. This combined layer was projected to the NAD 1983 Mass. State Plane Mainland Meters coordinate system.
These data, covering the full coastal area of Massachusetts, 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 (SLR) and its associated impacts on the nation's coastal areas.
The purpose of the Sea Level Rise and Coastal Flooding Impacts Viewer is to provide coastal managers and scientists with a preliminary look at sea level rise and coastal flooding impacts.
These polygon data depict the potential sea level rise inundation of coastal areas resulting from a projected 1 to 10 feet rise in sea level above current Mean Higher High Water (MHHW) conditions. Although the water surface mapped represents a particular increase in sea level in feet above MHHW, the actual cell values in NOAA's original raster data represent depth in meters.
The layer name for the SLR inundation data is NOAA_SLR_MA_POLY.
The process NOAA used to produce the SLR inundation data can be described as a modified "bathtub approach" that attempts to account for both local/regional tidal variability as well as hydrological connectivity. The process uses two source datasets to derive the final inundation rasters and polygons and accompanying low-lying polygons for each iteration of sea level rise: the Digital Elevation Model (DEM) of the area and a tidal surface model that represents spatial tidal variability. The tidal model is created using the NOAA National Geodetic Survey's VDATUM datum transformation software in conjunction with spatial interpolation/extrapolation methods and represents the MHHW tidal datum in orthometric values (North American Vertical Datum of 1988).
The model 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, not exact location, of inundation from sea level rise.
See NOAA's detailed methodology for producing these data.
MassGIS downloaded all the data from https://coast.noaa.gov/slrdata/ and combined the separate inundation polygon feature classes into one feature class that contains no overlap. The processing included Dice (for faster drawing speed), Dissolve, Union, and field calculations. This combined layer was projected to the NAD 1983 Mass. State Plane Mainland Meters coordinate system.
These data, covering the full coastal area of Massachusetts, 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 (SLR) and its associated impacts on the nation's coastal areas.
The purpose of the Sea Level Rise and Coastal Flooding Impacts Viewer is to provide coastal managers and scientists with a preliminary look at sea level rise and coastal flooding impacts.
These polygon data depict the potential sea level rise inundation of coastal areas resulting from a projected 1 to 10 feet rise in sea level above current Mean Higher High Water (MHHW) conditions. Although the water surface mapped represents a particular increase in sea level in feet above MHHW, the actual cell values in NOAA's original raster data represent depth in meters.
The layer name for the SLR inundation data is NOAA_SLR_MA_POLY.
The process NOAA used to produce the SLR inundation data can be described as a modified "bathtub approach" that attempts to account for both local/regional tidal variability as well as hydrological connectivity. The process uses two source datasets to derive the final inundation rasters and polygons and accompanying low-lying polygons for each iteration of sea level rise: the Digital Elevation Model (DEM) of the area and a tidal surface model that represents spatial tidal variability. The tidal model is created using the NOAA National Geodetic Survey's VDATUM datum transformation software in conjunction with spatial interpolation/extrapolation methods and represents the MHHW tidal datum in orthometric values (North American Vertical Datum of 1988).
The model 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, not exact location, of inundation from sea level rise.
See NOAA's detailed methodology for producing these data.
MassGIS downloaded all the data from https://coast.noaa.gov/slrdata/ and combined the separate inundation polygon feature classes into one feature class that contains no overlap. The processing included Dice (for faster drawing speed), Dissolve, Union, and field calculations. This combined layer was projected to the NAD 1983 Mass. State Plane Mainland Meters coordinate system.
These data, covering the full coastal area of Massachusetts, 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 (SLR) and its associated impacts on the nation's coastal areas.
The purpose of the Sea Level Rise and Coastal Flooding Impacts Viewer is to provide coastal managers and scientists with a preliminary look at sea level rise and coastal flooding impacts.
These polygon data depict the potential sea level rise inundation of coastal areas resulting from a projected 1 to 10 feet rise in sea level above current Mean Higher High Water (MHHW) conditions. Although the water surface mapped represents a particular increase in sea level in feet above MHHW, the actual cell values in NOAA's original raster data represent depth in meters.
The layer name for the SLR inundation data is NOAA_SLR_MA_POLY.
The process NOAA used to produce the SLR inundation data can be described as a modified "bathtub approach" that attempts to account for both local/regional tidal variability as well as hydrological connectivity. The process uses two source datasets to derive the final inundation rasters and polygons and accompanying low-lying polygons for each iteration of sea level rise: the Digital Elevation Model (DEM) of the area and a tidal surface model that represents spatial tidal variability. The tidal model is created using the NOAA National Geodetic Survey's VDATUM datum transformation software in conjunction with spatial interpolation/extrapolation methods and represents the MHHW tidal datum in orthometric values (North American Vertical Datum of 1988).
The model 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, not exact location, of inundation from sea level rise.
See NOAA's detailed methodology for producing these data.
MassGIS downloaded all the data from https://coast.noaa.gov/slrdata/ and combined the separate inundation polygon feature classes into one feature class that contains no overlap. The processing included Dice (for faster drawing speed), Dissolve, Union, and field calculations. This combined layer was projected to the NAD 1983 Mass. State Plane Mainland Meters coordinate system.
In Massachusetts, cities and towns are recognized and recorded as “county subdivisions” by the Census Bureau. County subdivisions are the primary divisions of counties and their equivalent entities for the reporting of decennial census data. A 5-character FIPS code (recorded in COUSUBFP) is used to uniquely identify each county subdivision. Census towns have linework that is often identical to the linework found in MassGIS' munipality boundaries, but also contains many minor discrepancies, particularly along hydrologic and coastal features. The annual Boundary and Annexation Survey (BAS) program attempts to reconcile significant differences in linework (typically discrepancies of 30 feet or more) between Census county subdivisions and the authoritative record, especially where populations are involved. Census towns have been processed and made available to provide a city and town reference for mapping that should align better than the MassGIS municipality boundaries with other Census-derived geographies, including voting districts. Some of the attributes from the MassGIS municipality boundaries have been transcribed into the Census towns attributes.
Town population counts from 1970 to 2010 were obtained from the “City and Town Sortable Rankings” tables provided by the UMass Amherst Donahue Instituteon this Secretary of the Commonwealth’s website. 1960 town population counts were obtained and transcribed from this reportpublished on this state library archives webpageby the Massachusetts Department of Commerce and Development, Bureau of Research and Statistics.