Impervious Surfaces in the Coastal Watershed of NH and Maine, High Resolution

Identification_Information:

Citation:

Citation_Information:

Originator: Earth Systems Research Center, University of New Hampshire
Publication_Date: 20220725
Title:

Impervious Surfaces in the Coastal Watershed of NH and Maine, High Resolution - 2021

Edition: One
Geospatial_Data_Presentation_Form: vector data
Publication_Information:

Publication_Place: Durham, New Hampshire
Publisher: Earth Systems Research Center, University of New Hampshire

Other_Citation_Details: None
Online_Linkage:

https://nhgeodata.unh.edu/nhgeodata/rest/services/EC/ImperviousSurfaces_Coastal_2021/MapServer/0

Online_Linkage:

https://ftp.granit.sr.unh.edu/GRANIT_Data/Vector_Data/Environment_and_Conservation/d-impervious/d-2021/imperv2021_coastal.zip

Larger_Work_Citation:

Citation_Information:

Originator: Earth Systems Research Center, University of New Hampshire
Publication_Date: 19860101
Title: NH GRANIT Database
Publication_Information:

Publication_Place: Durham, New Hampshire
Publisher: Earth Systems Research Center, University of New Hampshire

Online_Linkage: https://www.granit.unh.edu

Description:

Abstract:

This data set maps impervious surfaces as of 2021 within the 52 towns of the Piscataqua Region Estuaries Partnership (PREP). It also includes impervious features as of 2015, thereby facilitating change analysis. The data set identifies human-made surfaces that do not allow water to permeate through them. Naturally occurring impervious cover, such as exposed bedrock, is not included in the impervious class.

The data set was derived by updating previously delineated impervious features (developed using 2015 orthophotography) using 60-cm resolution, leaf-on, 4-band National Agriculture Imagery Program (NAIP) orthophotography acquired in 2021 as the basis for the update. Additional reference data sets, including older orthophoto imagery from 2015, were also used in the delineation of features.

Funding for this project was provided by a grant from the Piscataqua Regional Estuaries Partnership as authorized by the U.S. Environmental Protection Agency's National Estuary Program.

Purpose:

This data set is intended to map the location and distribution of human-made impervious cover in the 52 towns of the Piscataqua Region Estuaries Partnership (PREP). It can be used for water quality and management applications at large scales.

Supplemental_Information:

Data distribution tile: Towns in the Coastal Watershed of NH and Maine Data distribution format: shapefile

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2021

Currentness_Reference: source photography date

Status:

Progress: Complete
Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -71.377902
East_Bounding_Coordinate: -70.538180
North_Bounding_Coordinate: 43.688718
South_Bounding_Coordinate: 42.854136

Keywords:

Theme:

Theme_Keyword_Thesaurus: None
Theme_Keyword: Impervious
Theme_Keyword: Impervious cover
Theme_Keyword: Impervious surface
Theme_Keyword: Runoff
Theme_Keyword: Land use
Theme_Keyword: Landuse
Theme_Keyword: Land cover
Theme_Keyword: Landcover
Theme_Keyword: Photo interpretation

Place:

Place_Keyword_Thesaurus: None
Place_Keyword: United States
Place_Keyword: Northeast
Place_Keyword: New England
Place_Keyword: Maine
Place_Keyword: New Hampshire
Place_Keyword: York County
Place_Keyword: Rockingham County
Place_Keyword: Strafford County
Place_Keyword: Piscataqua River

Access_Constraints: None
Use_Constraints: Not for legal use.
Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: GRANIT Database Manager
Contact_Organization: Earth Systems Research Center

Contact_Position: GRANIT Database Manager
Contact_Address:

Address_Type: mailing and physical address
Address: Morse Hall, University of New Hampshire
City: Durham
State_or_Province: NH
Postal_Code: 03824
Country: US

Contact_Voice_Telephone: 603-862-1214
Contact_Facsimile_Telephone: 603-862-0188
Contact_Electronic_Mail_Address: granit@unh.edu
Hours_of_Service: 8:30AM-5PM, EST

Data_Set_Credit:

GRANIT database, Earth Systems Research Center, University of New Hampshire

Native_Data_Set_Environment: ESRI ArcGIS Pro 2.9

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Data were derived by manually interpreting impervious surface features from the source orthophotography, displayed at a scale of 1:2,000 or greater. This was followed by a review process, where results were checked at scales not less than 1:2,000.

Logical_Consistency_Report: This is a complete vector data set.
Completeness_Report:

The 52 Piscataqua Region Estuaries Partnership (PREP) towns were mapped and classified.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Data were generated primarily from photo interpretation of 2021 digital orthophotography 1:12,000-scale, true-color or color infrared, 60-centimeter, aerial photographs.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Quantum Spatial (f/k/a Photo Science)
Publication_Date: 2015
Title: 2015 Color Digital Orthophotography

Source_Scale_Denominator: 2,400
Type_of_Source_Media: online
Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20150506
Ending_Date: 20150514

Source_Currentness_Reference: source photography date

Source_Citation_Abbreviation: DO2015
Source_Contribution:

Provided reference photography during the update step of impervious cover generation.

Source_Information:

Source_Citation:

Citation_Information:

Originator: USDA-FSA-APFO
Publication_Date: 2021
Title: USDA-FSA-APFO Digital Ortho Mosaic

Source_Scale_Denominator: 12,000
Type_of_Source_Media: online
Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2021

Source_Currentness_Reference: source photography date

Source_Citation_Abbreviation: NAIP2021
Source_Contribution:

Provided the basic source photography for visual reference during the update step of impervious cover generation.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Earth Systems Research Center, University of New Hampshire
Publication_Date: 20170607
Title:

Impervious Surfaces in the Coastal Watershed of NH and Maine, High Resolution - 2015

Source_Scale_Denominator: 2,400
Type_of_Source_Media: digital map
Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20150506
Ending_Date: 20150711

Source_Currentness_Reference: publication date

Source_Citation_Abbreviation: IC2015
Source_Contribution:

Provided the initial mapping of impervious cover for the study area.

Process_Step:

Process_Description:

The IC coverage was derived by viewing the 2015 impervious cover data set (IC2015), visually interpreting changes visible from the NAIP2021 data, and manually digitizing new and changed IC features. Data were initially displayed at a minimum scale of 1:2,000 to identify features to be digitized. The scale was typically increased to 1:1,000 (or greater) when actively digitizing features.

In addition to mapping 2021 features, updates were made to the IC2015 to capture or delete IC as appropriate. Most of the updates addressed prior errors of omission (e.g. missing features). Typically, these errors occurred because features on the ground were at least partially obscured by tree canopy in the DO2015 imagery but became visible in the 2021 imagery. The errors were addressed by confirming their presence in the 2015 imagery, and then digitizing the features from the 2021 imagery. Errors of commission from the IC2015 data, e.g. false positives, were also updated as appropriate.

Source_Used_Citation_Abbreviation: DO2015
Source_Used_Citation_Abbreviation: NAIP2021
Source_Used_Citation_Abbreviation: IC2015
Process_Date: 202204

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: 145568

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: State Plane Coordinate System 1983
State_Plane_Coordinate_System:

SPCS_Zone_Identifier: 2800
Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.999967
Longitude_of_Central_Meridian: -71.666667
Latitude_of_Projection_Origin: 42.500000
False_Easting: 984250.000000
False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:

Abscissa_Resolution: 0.000512
Ordinate_Resolution: 0.000512

Planar_Distance_Units: survey feet

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: imperv2021_coastal
Entity_Type_Definition: vector dataset
Entity_Type_Definition_Source: Esri.

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: IC_2021
Attribute_Definition: Impervious cover indicator for 2021
Attribute_Definition_Source: NH GRANIT
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition:

Impervious cover, or surfaces through which water cannot permeate. This class includes paved surfaces, building rooftops, patios, compacted gravel, etc. This class does not include features such as railroads, swimming pools, or docks. In addition, it does not include natural features such as exposed bedrock.

Enumerated_Domain_Value_Definition_Source: GRANIT

Attribute:

Attribute_Label: IC_2015
Attribute_Definition: Impervious cover indicator for 2015
Attribute_Definition_Source: NH GRANIT
Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition:

Enumerated_Domain_Value_Definition_Source: GRANIT

Attribute:

Attribute_Label: Shape_Leng
Attribute_Definition: Length of feature in internal units.
Attribute_Definition_Source: Esri.
Attribute_Domain_Values:

Unrepresentable_Domain: Positive real numbers that are previously generated.

Attribute:

Attribute_Label: Shape_Area
Attribute_Definition: Area of feature in internal units squared.
Attribute_Definition_Source: Esri.
Attribute_Domain_Values:

Unrepresentable_Domain: Positive real numbers that are previously generated.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Earth Systems Research Center, University of New Hampshire
Contact_Person: GRANIT Database Manager

Contact_Position: GRANIT Database Manager
Contact_Address:

Address_Type: mailing and physical address
Address: Morse Hall, University of New Hampshire
City: Durham
State_or_Province: NH
Postal_Code: 03824
Country: US

Contact_Voice_Telephone: 603-862-1214
Contact_Facsimile_Telephone: 603-862-0188
Contact_Electronic_Mail_Address: granit@unh.edu
Hours_of_Service: 8:30AM-5PM. EST

Resource_Description: Downloadable Data
Distribution_Liability:

Digital data in NH GRANIT represent the efforts of the contributing agencies to record information from the cited source materials. Earth Systems Research Center, under contract to the NH Office of Planning and Development, and in consultation with cooperating agencies, maintains a continuing program to identify and correct errors in these data. OPD, ESRC, and the cooperating agencies make no claim as to the validity or reliability or to any implied uses of these data.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: ESRI shapefile
Transfer_Size: 76

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: https://www.granit.unh.edu

Fees:

No charge when downloaded from the Internet. Cost of reproduction for provision on other media.

Ordering_Instructions:

Email GRANIT (granit@unh.edu) or order from web site (www.granit.unh.edu).

Turnaround: Two weeks.

Metadata_Reference_Information:

Metadata_Date: 20220725
Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Earth Systems Research Center, University of New Hampshire
Contact_Person: GRANIT Database Manager

Contact_Position: GRANIT Database Manager
Contact_Address:

Address_Type: mailing and physical address
Address: Morse Hall, University of New Hampshire
City: Durham
State_or_Province: NH
Postal_Code: 03824

Contact_Voice_Telephone: 603-862-1214
Contact_Facsimile_Telephone: 603-862-0188
Contact_Electronic_Mail_Address: granit@unh.edu
Hours_of_Service: 8:30AM-5PM, EST

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Extensions:

Online_Linkage: http://www.esri.com/metadata/esriprof80.html
Profile_Name: ESRI Metadata Profile

Impervious Surfaces in the Coastal Watershed of NH and Maine, High Resolution - 2021

Metadata: