The Boston Harbor Association / City of Boston Projected Flooding Extent

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: The Boston Harbor Association
Publication_Date: 20130101
Title:
The Boston Harbor Association / City of Boston Projected Flooding Extent
Geospatial_Data_Presentation_Form: data - polygon feature class
Publication_Information:
Publication_Place: MA
Publisher: The Boston Harbor Association
Other_Citation_Details:
This work is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License. To view a copy of this license, visit <http://creativecommons.org/licenses/by-sa/3.0/> or send a letter to Creative Commons, 444 Castro Street, Suite 900, Mountain View, California, 94041, USA.
Online_Linkage: <http://tbha.org/climate-change-adaptation>
Online_Linkage: <http://tbha.org/preparing-rising-tide-report>
Online_Linkage: <http://creativecommons.org/licenses/by-sa/3.0/deed.en_US>
Larger_Work_Citation:
Citation_Information:
Originator: The Boston Harbor Association
Publication_Date: 20130101
Title: Preparing for the Rising Tide
Publication_Information:
Publication_Place: MA
Publisher: The Boston Harbor Association
Online_Linkage: <http://tbha.org>
Description:
Abstract:
The dataset includes the horizontal spatial extent of five-foot and seven-and-one-half-foot coastal floods above mean higher high water in the City of Boston. The project report does not predict any specific levels over time, but describes a suite of coastal flood scenarios that could result from a combination of factors (sea level rise, storm surge, astronomical high tides, etc.).
Purpose:
To illustrate and evaluate the impact of the higher 100-year coastal floods in the future, we produced two datasets representing stillwater flood elevations over land for flood heights of five-feet and seven-and-one-half-feet above mean higher high water (MHHW, the average of the higher high water elevation of each tidal day).
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20100101
Ending_Date: 21000101
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -71.181026
East_Bounding_Coordinate: -70.871986
North_Bounding_Coordinate: 42.399225
South_Bounding_Coordinate: 42.265300
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Storm Surge
Theme_Keyword: Sea Level Rise
Theme_Keyword: Coastal Elevation
Theme_Keyword: Terrain Elevation
Theme_Keyword: Inundation
Theme_Keyword: Coastal Flooding
Theme_Keyword: Tidal Height
Theme_Keyword: Digital Elevation Model
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Categories
Theme_Keyword: elevation
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: United States
Place_Keyword: Northeast
Place_Keyword: New England
Place_Keyword: Massachusetts
Place_Keyword: Charles River
Place_Keyword: Mystic River
Place_Keyword: Neponset River
Place_Keyword: Boston
Place_Keyword: Brookline
Place_Keyword: Cambridge
Place_Keyword: Chelsea
Place_Keyword: Everett
Place_Keyword: Milton
Place_Keyword: Newton
Place_Keyword: Quincy
Place_Keyword: Revere
Place_Keyword: Somerville
Place_Keyword: Watertown
Place_Keyword: Winthrop
Access_Constraints: No access constraints are associated with this data.
Use_Constraints:
The vertical elevations and depths represented by these datasets are no more accurate than the source dataset, the 2009 Boston LiDAR Raster DEM. Please refer to the metadata for the source dataset for additional information relating to vertical and horizontal error. Users should be aware that temporal changes may have occurred since the 2009 Coastal LiDAR dataset was collected and that some parts of these derivative datasets may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations. The Barr Foundation is hereby acknowledged for funding the Preparing for the Rising Tide project. The Boston Redevelopment Authority is hereby acknowledged for acquisition and provision of the 2009 Boston LiDAR Raster DEM. Harvard University is hereby acknowledged for funding the development of these metadata. These datasets are provided for discussion and research purposes only. It is not appropriate to use these datasets for detailed analysis (i.e., at the community or parcel level). Please contact The Boston Harbor Association at <http://tbha.org> for additional information on methodology and limitations.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: The Boston Harbor Association
Contact_Person: Julie Wormser
Contact_Address:
Address_Type: mailing and physical
Address: 374 Congress Street, Suite 307
City: Boston
State_or_Province: MA
Postal_Code: 02210
Country: US
Contact_Voice_Telephone: (617) 482-1722 x102
Contact_Electronic_Mail_Address: jwormser@tbha.org
Native_Data_Set_Environment:
Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.2.0.3348
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The accuracy of this dataset is dependent upon the accuracy of the source DEM. Additionally, because the 2009 Boston LiDAR data was not tidally constrained, elevation values in areas at or near coastal shorelines should be presumed to not necessarily accurately represent land elevations.
Quantitative_Attribute_Accuracy_Assessment:
Attribute_Accuracy_Value: No formal attribute accuracy tests were conducted
Attribute_Accuracy_Explanation: No formal attribute accuracy tests were conducted
Logical_Consistency_Report:
Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
Completeness_Report: See process steps for discussion of completeness of dataset.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: No formal positional accuracy tests were conducted
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
The vertical unit of the source bare-earth DEM is decimal meters. The listed RMSE values shown below were obtained from the following source: Sanborn Map Company, Inc. (2010) NREL / Boston Redevelopment Authority, LiDAR for the City of Boston Project (Pilot) Review, January 12, 2010
Quantitative_Vertical_Positional_Accuracy_Assessment:
Vertical_Positional_Accuracy_Value: 0.15
Vertical_Positional_Accuracy_Explanation: RMSE in meters, bare areas
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: The Sanborn Map Company
Publication_Date: 20090101
Title:
2009 LiDAR for the City of Boston LiDAR NREL / Boston Redevelopment Authority
Geospatial_Data_Presentation_Form: Raster DEM
Publication_Information:
Publication_Place: MA
Publisher: MassGIS
Online_Linkage:
<http://www.mass.gov/anf/research-and-tech/it-serv-and-support/application-serv/office-of-geographic-information-massgis/datalayers/ftplidar-2009cityofboston.html>
Type_of_Source_Media: hardDisk
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20091109
Ending_Date: 20091110
Source_Currentness_Reference: Ground Condition
Source_Citation_Abbreviation: 2009 Boston LiDAR Raster DEM
Source_Contribution: 2009 Boston LiDAR Raster DEM
Process_Step:
Process_Description:
1 - Individual LiDAR tiles were selected within the study area. These tiles were then mosaiced into a new raster dataset (bos09mosaic).
Process_Date: 20121128
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: UMass Boston
Contact_Person: Chris Watson
Contact_Position: Research Assistant / GIS Specialist
Contact_Address:
Address_Type: mailing and physical
Address: 100 Morrissey Boulevard
City: Boston
State_or_Province: MA
Postal_Code: 02125
Country: US
Contact_Voice_Telephone: (617) 287-7440
Contact_Electronic_Mail_Address: chris.watson@umb.edu
Process_Step:
Process_Description:
2 - Elevation slices were performed on the bos09mosaic by setting all raster values greater than the target elevation to Null, generating a new raster dataset (bos09fld_MMM_raw, where MMM = flood elevation in centimeters NAVD). Flood elevations were calculated using the elevation of Mean Higher High Water (MHHW) in Boston Harbor plus 5 feet (ft) and 7.5 ft. The elevation of MHHW in Boston Harbor in 2012 was 420.5 centimeters (cm) NAVD (1983-2001 Tidal Epoch; <http://tidesandcurrents.noaa.gov/data_menu.shtml?unit=0&format=Apply+Change&stn=8443970+Boston%2C+MA&type=Datums>). Therefore, elevation slices were performed for the following values of MMM: MHHW + 5.0 ft = 298 cm NAVD MHHW + 7.5 ft = 374 cm NAVD
Process_Date: 20121128
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: UMass Boston
Contact_Person: Chris Watson
Contact_Position: Research Assistant / GIS Specialist
Contact_Address:
Address_Type: mailing and physical
Address: 100 Morrissey Boulevard
City: Boston
State_or_Province: MA
Postal_Code: 02125
Country: US
Contact_Voice_Telephone: (617) 287-7440
Contact_Electronic_Mail_Address: chris.watson@umb.edu
Process_Step:
Process_Description:
3 - The raw flood raster dataset (bos09fld_MMM_raw) was converted a polygon feature class (bos09fld_MMM_fc).
Process_Date: 20121128
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: UMass Boston
Contact_Person: Chris Watson
Contact_Position: Research Assistant / GIS Specialist
Contact_Address:
Address_Type: mailing and physical
Address: 100 Morrissey Boulevard
City: Boston
State_or_Province: MA
Postal_Code: 02125
Country: US
Contact_Voice_Telephone: (617) 287-7440
Contact_Electronic_Mail_Address: chris.watson@umb.edu
Process_Step:
Process_Description:
4 - The polygon feature class (bos09fld_MMM_fc) was edited to remove low elevation areas that were likely hydraulically isolated from the ocean. In the City of Boston, additional processing (discussed in process step 5) is required to remove areas upstream of the Charles River Dam for flood elevations that do not exceed the elevation of the top of the dam. Generally, the largest individual polygon was selected as representing the ocean. Next, individual polygons adjacent to the ocean polygon were reviewed to determine if they were likely to be hydraulically connected to the ocean (i.e., isolated during the elevation slice due to the presence of a road culvert). These individual polygons were selected based on professional judgement with the assistance of concurrent GIS review of USGS topographic maps, aerial photographs and roads, as well as limited local knowledge of specific waterbodies.
Process_Date: 20121128
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: UMass Boston
Contact_Person: Chris Watson
Contact_Position: Research Assistant / GIS Specialist
Contact_Address:
Address_Type: mailing and physical
Address: 100 Morrissey Boulevard
City: Boston
State_or_Province: MA
Postal_Code: 02125
Country: US
Contact_Voice_Telephone: (617) 287-7440
Contact_Electronic_Mail_Address: chris.watson@umb.edu
Process_Step:
Process_Description:
5 - The flood elevation of MHHW + 7.5 feet (374 cm NAVD) exceeds the top of the Charles River Dam (353 cm NAVD; Reference: "Charles River Dam, Design Memorandum No. 2", The Department of the Army New England Division Corps of Engineers, 1972). Therefore, the polygon feature class representing MHHW + 7.5 feet (bos09fld_374) was considered final after process step 4 was completed. The flood elevation of MHHW + 5 feet (298 cm NAVD) does not exceed the top of the Charles River Dam (353 cm NAVD). Therefore, the polygon feature class representing MHHW + 5 feet (bos09fld_298) required additional processing to remove areas upstream of the Charles River Dam not hydraulically connected to the ocean during a flooding event. The polygon feature class bos09fld_298 was edited based on professional judgement with the assistance of concurrent GIS review of USGS topographic maps, aerial photographs and roads, as well as limited local knowledge of the configuration of the lock system at the Charles River Dam. The resulting new polygon feature class is provided as bos09fld_298_CRD.
Process_Date: 20121128
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: UMass Boston
Contact_Person: Chris Watson
Contact_Position: Research Assistant / GIS Specialist
Contact_Address:
Address_Type: mailing and physical
Address: 100 Morrissey Boulevard
City: Boston
State_or_Province: MA
Postal_Code: 02125
Country: US
Contact_Voice_Telephone: (617) 287-7440
Contact_Electronic_Mail_Address: chris.watson@umb.edu
Process_Step:
Process_Description: 6 - Added inundation level in feet attribute.
Process_Date: 20131125
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Massachusetts Office of Coastal Zone Management
Contact_Position: CZM Data Manager
Contact_Address:
Address_Type: mailing and physical
Address: 251 Causeway Street, Suite 800
City: Boston
State_or_Province: MA
Postal_Code: 02114-2138
Country: USA
Contact_Voice_Telephone: 617-626-1200
Contact_Facsimile_Telephone: 617-626-1240
Contact_Electronic_Mail_Address: czm@state.ma.us
Hours_of_Service: 0900 hrs to 1600 hrs EST
Contact_Instructions: email only
Process_Step:
Process_Description:
7 - Reprojected data to the Massachusetts State Plane Coordinate System, Mainland Zone, meters.
Process_Date: 20131125
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Massachusetts Office of Coastal Zone Management
Contact_Position: CZM Data Manager
Contact_Address:
Address_Type: mailing and physical
Address: 251 Causeway Street, Suite 800
City: Boston
State_or_Province: MA
Postal_Code: 02114-2138
Country: USA
Contact_Voice_Telephone: 617-626-1200
Contact_Facsimile_Telephone: 617-626-1240
Contact_Electronic_Mail_Address: czm@state.ma.us
Hours_of_Service: 0900 hrs to 1600 hrs EST
Contact_Instructions: email only
Process_Step:
Process_Description:
8 - The features were subdivided into 1x1-km polygon cells and converted from multipart to singlepart features to improve drawing performance in CZM's online mapping tool MORIS.
Process_Date: 20131204
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Massachusetts Office of Coastal Zone Management
Contact_Position: CZM Data Manager
Contact_Address:
Address_Type: mailing and physical
Address: 251 Causeway Street, Suite 800
City: Boston
State_or_Province: MA
Postal_Code: 02114-2138
Country: USA
Contact_Voice_Telephone: 617-626-1200
Contact_Facsimile_Telephone: 617-626-1240
Contact_Electronic_Mail_Address: czm@state.ma.us
Hours_of_Service: 0900 hrs to 1600 hrs EST
Contact_Instructions: email only
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 788
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: NAD 1983 StatePlane Massachusetts Mainland FIPS 2001
Lambert_Conformal_Conic:
Standard_Parallel: 41.71666666666667
Standard_Parallel: 42.68333333333333
Longitude_of_Central_Meridian: -71.5
Latitude_of_Projection_Origin: 41.0
False_Easting: 200000.0
False_Northing: 750000.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.000000008155898179040834
Ordinate_Resolution: 0.000000008155898179040834
Planar_Distance_Units: meter
Geodetic_Model:
Horizontal_Datum_Name: D North American 1983
Ellipsoid_Name: GRS 1980
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257222101
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: TBHA_SLR
Entity_Type_Definition:
Flood elevation in feet relative to the North American Vertical Datum of 1988
Entity_Type_Definition_Source: Producer defined
Attribute:
Attribute_Label: FID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: FLOOD_FT
Attribute_Definition: Inundation level above Mean Higher High Water.
Attribute_Definition_Source: The Boston Harbor Association
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 5
Enumerated_Domain_Value_Definition: 5 foot inundation level
Enumerated_Domain_Value_Definition_Source: The Boston Harbor Association
Enumerated_Domain:
Enumerated_Domain_Value: 7.5
Enumerated_Domain_Value_Definition: 7.5 foot inundation level
Enumerated_Domain_Value_Definition_Source: The Boston Harbor Association
Overview_Description:
Entity_and_Attribute_Overview: See process step 2 for attribute values
Entity_and_Attribute_Detail_Citation: See process step 2 for attribute citations
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: The Boston Harbor Association
Contact_Person: Julie Wormser
Contact_Address:
Address_Type: mailing and physical
Address: 374 Congress Street, Suite 307
City: Boston
State_or_Province: US
Postal_Code: MA
Country: 02210
Contact_Voice_Telephone: (617) 482-1722 x102
Contact_Electronic_Mail_Address: jwormser@tbha.org
Distribution_Liability:
The Boston Harbor Association makes no claims as to the validity or reliability or to any implied uses of these data.
Metadata_Reference_Information:
Metadata_Date: 20131204
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: UMass Boston
Contact_Person: Chris Watson
Contact_Position: Research Assistant / GIS Specialist
Contact_Address:
Address_Type: mailing and physical
Address: 100 Morrissey Boulevard
City: Boston
State_or_Province: MA
Postal_Code: 02125
Country: US
Contact_Voice_Telephone: (617) 287-7440
Contact_Electronic_Mail_Address: chris.watson@umb.edu
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Generated by mp version 2.9.12 on Wed Dec 04 11:54:51 2013