BASEMAP, CITY OF DERBY, NEW HAVEN COUNTY, CONNECTICUT - Levee PMR

Resource lineage description

source

source description  Source Contribution: Location of Coastal Barrier Resources System Areas.Source Type Paper

representative resolution scale:

Scale denominator: 24000

source citation

Title John H. Chafee Coastal Barrier Resources System maps

publication  Date   1990-01-01

presentationForm  mapDigital

other Citation Details  The Coastal Barrier Resources Act (P.L. 97-348) of 1982 established the John H. Chafee Coastal Barrier Resources System (CBRS) which is comprised of coastal barrier units along the Atlantic, Gulf of Mexico, and Great Lakes coasts. These areas are depicted on a series of maps entitled ?John H. Chafee Coastal Barrier Resources System? that are enacted by Congress. Most new Federal expenditures and financial assistance (including flood insurance) are prohibited within the CBRS. Since its inception in 1982, the CBRS has since been amended by several acts of Congress, including the Coastal Barrier Improvement Act of 1990 (P.L. 101-591). With minor exception, only Congress, through new legislation, can modify the boundaries of the CBRS. The U.S. Fish and Wildlife Service (FWS) is responsible for maintaining the official maps of the CBRS, and facilitating changes enacted by Congress. In cooperation with the Federal Emergency Management Agency, FWS digitized the CBRS boundaries from the official CBRS source maps for this area and adjusted them to ?fit? the digital Flood Insurance Rate Map (FIRM). The process of ?fitting? CBRS boundaries to the FIRM base map in some cases resulted in a slightly different configuration of the line as shown on the Congressionally-adopted source maps. The CBRS boundaries depicted on this FIRM are not the controlling CBRS boundaries adopted by Congress. The official CBRS maps used to determine whether or not an area is located within the CBRS are available for download at http://www.fws.gov. An official determination of whether or not an area is located within the CBRS can be obtained by contacting the FWS field office at the phone number shown on the body of the FIRM panel.

cited responsible party - publisher

organisation Name  U.S. Fish and Wildlife Service

Contact information

Address

, Washington, D.C.

cited responsible party - originator

organisation Name  U.S. Fish and Wildlife Service

source

source description  Source Contribution: Location of roads, railroads, bridges, streams, and other physical features.Source Type On-line

representative resolution scale:

Scale denominator: 12000

source citation

Title Connecticut 2004 Orthophoto

publication  Date   2007-05-14

presentationForm  REMOTE SENSING IMAGE

other Citation Details  Digital Orthophotography provided by the State of Connecticut, Department of Environmental Protection through the Map and Geographic Information Center (MAGIC) at the University of Connecticut. This information was provided as 0.8-foot resolution black and white orthophotography produced from photography flown in 2004.Minute U.S. Geological Survey topographic quadrangle maps and digitized at 1:24,000 scale (1 inch = 2,000 feet).

cited responsible party - publisher

organisation Name  State of Connecticut

Contact information

Address

, Hartford, CT

cited responsible party - originator

organisation Name  State of Connecticut Department of Environmental Protection

cited responsible party - originator

organisation Name  Department of Public Safety

cited responsible party - originator

organisation Name  Department of Transportation

source

source description  Source Contribution: Spatial and attribute information for town political boundaries based upon USGS 7.5 minute quadrangle maps.Source Type Website

representative resolution scale:

Scale denominator: 24000

source citation

Title Town_Connecticut_Line Shapefile

publication  Date   1994-01-01

presentationForm  mapDigital

other Citation Details  The USGS is the collector of the data (compiler). The State of Connecticut, Department of Environmental Protection is the creator and maintainer of the data layer (editor) and producer (publisher) of this information for use. The 2005 Edition essentially includes the same set of geographic features published in 1994. However, the 2005 Edition differs from information published in 1994 primarily as a result of minor corrections and improvements to feature geometry and feature attribute information. Some feature attribute information (data fields) have been slightly modified and made easier to use. This layer includes information that is relatively static and does not change over time. Data is not updated. Data compiled at 1:24,000 scale.

cited responsible party - publisher

organisation Name  State of Connecticut Environmental Protection Agency

Contact information

Address

, Hartford, CT

cited responsible party - originator

organisation Name  State of Connecticut, Department of Environmental Protection

source

source description  Source Contribution: Spatial and attribute information for all land owned and operated by Connecticut DEP to gain a better understanding of the open space in the state.Source Type Website

representative resolution scale:

Scale denominator: 24000

source citation

Title DEP_Property Shapefile

publication  Date   2004-11-01

presentationForm  mapDigital

other Citation Details  DEP Property is a polygon feature-based layer that includes all land owned in fee simple interest by the State of Connecticut Department of Environmental Protection. This layer is based on information that was collected and mapped at various scales and at different levels of accuracy. Generally, partial interests such as easements or development rights are not included in this layer. The exception is flood control areas, which may include permanent easements. Types of property in this layer include parks, forests, wildlife areas, flood control areas, scenic preserves, natural areas, historic reserves, DEP owned waterbodies, water access sites and other miscellaneous properties. This layer is current and is updated as parcels are acquired by DEP.

cited responsible party - publisher

organisation Name  Department of Environmental Protection

Contact information

Address

, Hartford, CT

cited responsible party - originator

organisation Name  State of Connecticut Department of Environmental Protection

source

source description  Source Contribution: Spatial and attribute information for the index of USGS 7.5-Minute Series Topographic Map boundaries.Source Type Online

representative resolution scale:

Scale denominator: 24000

source citation

Title USGS QUADRANGLE MAPS

publication  Date   1985-01-01

presentationForm  DIGITAL RASTER DATA

other Citation Details  USGS has mapped the county with 1:24000 scale topographic maps (also referred to as 7.5-minute quadrangles). The entire county was mapped by the late 1980s. From the raster topographic maps, a vector index of the USGS topographic maps with its corresponding tile identification number and name was created.

cited responsible party - publisher

organisation Name  U.S. Geological Survey

Contact information

Address

, Reston, VA

cited responsible party - originator

organisation Name  U.S. Geological Survey

source

source description  Source Contribution: National Geodetic Survey reference points (bench marks).Source Type On-line

representative resolution scale:

Scale denominator: 24000

source citation

Title Geodetic bench mark positions and descriptions

publication  Date   2010-01-01

presentationForm  mapDigital

other Citation Details  The National Geodetic Survey (NGS) serves as the Nation's depository for geodetic data in the National Spatial Reference System. These geodetic data include bench marks and other control points that provide the base of reference for latitude, longitude, height, scale, orientation, and gravity measurements used throughout the United States.

cited responsible party - publisher

organisation Name  Silver Spring, MD

Contact information

Address

, Silver Spring, MD

cited responsible party - originator

organisation Name  National Geodetic Survey

source

source description  Source Contribution: Spatial and attribute information for General Structures, Water Lines and Water Areas stations starts.Source Type Paper

representative resolution scale:

Scale denominator: 6000

source citation

Title Flood Insurance Study, Flood Insurance Rate Maps, Flood Boundary and Floodway Map, County work maps, New Haven County FIRMs and FBFMs prior to July 2007, and Letter of Map Revisions

publication  Date   1992-05-18

presentationForm  MAP AND DIGITAL RASTER AND VECTOR DATA

other Citation Details  Flood Insurance Study, Flood Insurance Rate Maps, Flood Boundary and Floodway Map, County work maps, New Haven County FIRMs and FBFMs prior to July 2007, City of Ansonia 19920518, Town of Beacon Falls 19790301, Town of Bethany 19801202, Town of Branford 19830418, Town of Cheshire 20020415, City of Derby 19910716, Town of East Haven 20030102, Town of Guilford 19860819, Town of Hamden 19790615, Town of Madison 19921104, City of Meriden 20001120, Town of Middlebury 19791016, City of Milford 19961106, Borough of Naugatuck 19790815, City of New Haven 19830502, Town of North Branford 19780703, Town of North Haven 19850501, Town of Orange 19800318, Town of Oxford 19791204, Town of Prospect 19950516, Town of Seymour 19910416, Town of Southbury 19811211, Town of Wallingford 19900604, City of Waterbury 19791101, City of West Haven 19830418, Town of Wolcott 19820705, Town of Woodbridge 19910318, New Haven County Work maps, and New Haven County FIRMs and FBFMs prior to July 2007, and

cited responsible party - publisher

organisation Name  Federal Emergency Management Agency

Contact information

Address

, Washington, DC

cited responsible party - originator

organisation Name  Federal Emergency Management Agency

AbsoluteExternalPositionalAccuracy

name Of Measure Horizontal Positional Accuracy Report

evaluation Method Description  The NSSDA is used to report the horizontal accuracy of the base map data used by FEMA to produce a FIRM. The NSSDA uses radial accuracy (Accuracy) to report the radius of a circle of uncertainty, such that the true or theoretical location of a point falls within that circle 95 percent of the time. (Guidelines and Specifications Vol 1, p. 70)

AbsoluteExternalPositionalAccuracy

name Of Measure Horizontal Positional Accuracy

measure Description  The minimum horizontal positional accuracy for new FIRM base map data is that of the default base map, the USGS DOQs, which have an NSSDA radial accuracy of 38 feet. Data that meet higher accuracy standards are also acceptable. Accuracy of 38 feet is the same as radial root mean square error (RMSEr) of 22 feet. (Guidelines and Specifications Vol 1, p. 70)

Quantitative Result

result value 5

value Units

Completeness Commission

evaluation Method Description  The Basemap datasets represents all the features utilized during the study mapping process to spatially position the DFIRM information and highlights the specific prioritization process laid out in the Guidelines and Specifications Vol 1, p. 69 in their selection for use. The final selection criteria, and rational for inclusion should be outlined here, along with rational for exclusion of use of specific base map datasets if applicable.

Completeness Omission

evaluation Method Description  The Basemap datasets represents all the features utilized during the study mapping process to spatially position the DFIRM information and highlights the specific prioritization process laid out in the Guidelines and Specifications Vol 1, p. 69 in their selection for use. The final selection criteria, and rational for inclusion should be outlined here, along with rational for exclusion of use of specific base map datasets if applicable.

ConceptualConsistency

measure Description  Polygons intersecting the neatline are closed along the border. Segments making up the outer and inner boundaries of a polygon tie end-to-end to completely enclose the area. Line segments are a set of sequentially numbered coordinate pairs. No duplicate features exist nor duplicate points in a data string. Intersecting lines are separated into individual line segments at the point of intersection. Point data are represented by two sets of coordinate pairs, each with the same coordinate values. Tests for logical consistency are performed by DFIRM tools topology verification software.