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In MACRIS the points are symbolized to indicate the most common historic designation types: 1) National Register of Historic Places, 2) local historic district, 3) both National Register and local historic district, 4) Preservation Restriction, and 5) inventoried but not designated with one of the previous designations. Less common designations are not symbolized in MACRIS, but are included in the Designations attribute field. MassGIS stores a copy of the point feature class as MHCINV_PT. MassGIS projected the data to the NAD1983 Mass. State Plane Meters Mainland coordinate system.
Provided to MassGIS on January 23, 2023.
Information from the MACRIS database and related records on file at the MHC, including the Inventory of Historic Assets of the Commonwealth, National Register of Historic Places nomination forms, local historic district study reports, local landmark reports, and other materials.
In MACRIS the points are symbolized to indicate the most common historic designation types: 1) National Register of Historic Places, 2) local historic district, 3) both National Register and local historic district, 4) Preservation Restriction, and 5) inventoried but not designated with one of the previous designations. Less common designations are not symbolized in MACRIS, but are included in the Designations attribute field. MassGIS stores a copy of the point feature class as MHCINV_PT. MassGIS projected the data to the NAD1983 Mass. State Plane Meters Mainland coordinate system.
Provided to MassGIS on January 23, 2023.
Information from the MACRIS database and related records on file at the MHC, including the Inventory of Historic Assets of the Commonwealth, National Register of Historic Places nomination forms, local historic district study reports, local landmark reports, and other materials.
In MACRIS the points are symbolized to indicate the most common historic designation types: 1) National Register of Historic Places, 2) local historic district, 3) both National Register and local historic district, 4) Preservation Restriction, and 5) inventoried but not designated with one of the previous designations. Less common designations are not symbolized in MACRIS, but are included in the Designations attribute field. MassGIS stores a copy of the point feature class as MHCINV_PT. MassGIS projected the data to the NAD1983 Mass. State Plane Meters Mainland coordinate system.
Provided to MassGIS on January 23, 2023.
Information from the MACRIS database and related records on file at the MHC, including the Inventory of Historic Assets of the Commonwealth, National Register of Historic Places nomination forms, local historic district study reports, local landmark reports, and other materials.
In MACRIS the points are symbolized to indicate the most common historic designation types: 1) National Register of Historic Places, 2) local historic district, 3) both National Register and local historic district, 4) Preservation Restriction, and 5) inventoried but not designated with one of the previous designations. Less common designations are not symbolized in MACRIS, but are included in the Designations attribute field. MassGIS stores a copy of the point feature class as MHCINV_PT. MassGIS projected the data to the NAD1983 Mass. State Plane Meters Mainland coordinate system.
Provided to MassGIS on January 23, 2023.
Information from the MACRIS database and related records on file at the MHC, including the Inventory of Historic Assets of the Commonwealth, National Register of Historic Places nomination forms, local historic district study reports, local landmark reports, and other materials.
In MACRIS the points are symbolized to indicate the most common historic designation types: 1) National Register of Historic Places, 2) local historic district, 3) both National Register and local historic district, 4) Preservation Restriction, and 5) inventoried but not designated with one of the previous designations. Less common designations are not symbolized in MACRIS, but are included in the Designations attribute field. MassGIS stores a copy of the point feature class as MHCINV_PT. MassGIS projected the data to the NAD1983 Mass. State Plane Meters Mainland coordinate system.
Provided to MassGIS on January 23, 2023.
Information from the MACRIS database and related records on file at the MHC, including the Inventory of Historic Assets of the Commonwealth, National Register of Historic Places nomination forms, local historic district study reports, local landmark reports, and other materials.
The political boundary datalayer is a polygon representation of town boundaries created from arcs developed from survey coordinates extracted from the 68-volume Harbor and Lands Commission Town Boundary Atlas for the 351 communities (cities and towns) in Massachusetts. The Atlas was published in the early 1900's and is maintained by the Survey Section of Massachusetts Highway Department. For communities with a coastal boundary, MassGIS has collaborated with Massachusetts Water Resources Authority and the Department of Environmental Protection to complete a 1:12000 scale coastline. The boundary for the coastline was defined as being the upland side of tidal flats and rocky inter-tidal zones. Note that the 351 communities are the official municipal names, not including "villages" or other sections of towns.
This layer represents worst-case Hurricane Surge Inundation areas for Category 1 through 4 hurricanes striking the coast of Massachusetts. Hurricane surge values were developed by the National Hurricane Center using the PV2 basin SLOSH (Sea Lake and Overland Surge from Hurricanes) Model data. This Surge Inundation layer was created by the U.S. Army Corps of Engineers, New England District. Using ArcInfo's Grid extension, LiDAR bare earth elevation data were subtracted from the worst-case hurricane surge values to determine which areas could be expected to be inundated. The layer is named HURR_INUN_ZONES_POLY.
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.