LandLandcov_IMPERVLCB2011

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: University of Vermont Spatial Analysis Laboratory (SAL)

Publication_Date: 20140205

Publication_Time: unknown

Title: LandLandcov_IMPERVLCB2011

Edition: 2011

Geospatial_Data_Presentation_Form: vector digital data

Series_Information:

Series_Name:

Impervious Surfaces for the the NY and VT Portions of the Lake Champlain Basin, 2011

Issue_Identification: 2011A

Publication_Information:

Publication_Place: Waterbury VT 05676

Publisher: Vermont Center for Geographic Information

Other_Citation_Details: Tile Structure - BASIN

Description:

Abstract:

High-resolution impervious surfaces dataset for the Lake Champlain Basin, Vermont and New York. Two impervious classes were mapped: (1) Roads\Railroads; and (2) Other Impervious. The latter category included parking lots, driveways, sidewalks, and buildings. Pertinent imagery could not be obtained for the Quebec portion of the Lake Champlain Basin, which was thus excluded from the final product. The primary source used to derive this impervious surfaces layer was 1-meter resolution National Agricultural Imagery Program (NAIP) data acquired in 2011. The NAIP datasets covering the study area were 4-band aerial imagery, meaning that they contained a Near Infrared band in addition to the visible bands (i.e., Red, Green, Blue). This band improved the utility of the imagery, permitting use of vegetation indices that rely on the Near Infrared and Red bands (e.g., Normalized Difference Vegetation Index). Ancillary data sources included various thematic vector GIS datasets, including the Lake Champlain Basin watershed boundary, lakes, stream centerlines, road centerlines, railroad centerlines, and building points. This impervious surfaces dataset is considered current as of 2011. Object-based image analysis techniques (OBIA) were used to extract impervious surfaces using the best available remotely-sensed and vector GIS datasets. OBIA systems work by grouping pixels into meaningful objects based on their spectral and spatial properties while taking into account boundaries imposed by existing vector datasets. Within the OBIA environment, a rule-based expert system was designed to effectively mimic the process of manual image analysis by incorporating the elements of image interpretation (color/tone, texture, pattern, location, size, and shape) into the classification process. A series of morphological procedures were used to ensure that the end product was both accurate and cartographically coherent. It is important to note that the mapping protocol described above was a "top-down" approach: impervious surfaces were mapped when they were visible in the available aerial imagery. In practical terms, impervious surfaces were not captured by the mapping process when they were obscured by tree canopy. Although this modeling limitation means that the total area of extant impervious surfaces would be underestimated in subsequent analyses, it also provides a better estimate of surfaces whose environmental effects are not mitigated by overhanging vegetation. Indeed, one of the well-known benefits of trees is that they absorb or slow rainwater before it hits the ground, so the top-down approach is a reasonable and effective method for mapping the impervious surfaces that most affect stormwater runoff volume. The draft impervious maps produced by automated feature extraction were extensively reviewed for accuracy, coherence, and aesthetic quality, and errors of omission and commission were fixed as necessary. Accuracy assessments were then conducted separately for the two sides of the Basin, indicating an overall accuracy of 99% for Vermont and 99% for New York. The overall accuracy for the combined area was also 99%. The user's accuracies for Roads/Railroads, Other Impervious, and Not Impervious were 98%, 98%, and 100% respectively.

Purpose:

This dataset provides a high-resolution estimate of the distribution and area of impervious surfaces in the Lake Champlain Basin, Vermont and New York. At the time of its creation, this dataset represented the most current, detailed, and accurate estimate of impervious surfaces in the Vermont and New York portions of the Lake Champlain Basin.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20110919

Time_of_Day: Unknown

Currentness_Reference: Ground Conditions

Status:

Progress: Complete

Maintenance_and_Update_Frequency: Unknown

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -74.454908

East_Bounding_Coordinate: -72.154701

North_Bounding_Coordinate: 45.037760

South_Bounding_Coordinate: 43.225864

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: imageryBaseMapsEarthCover

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: Impervious Surfaces

Theme_Keyword: Roads\Railroads

Theme_Keyword: Parking Lots

Theme_Keyword: Driveways

Theme_Keyword: Buildings

Access_Constraints:

VCGI and the State of VT make no representations of any kind, including but not limited to the warranties of merchantability or fitness for a particular use, nor are any such warranties to be implied with respect to the data.

Use_Constraints: None.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: VT Center for Geographic Information

Contact_Address:

Address_Type: Mailing and Physical Address

Address: 1 National Life Dr, Dewey Building, 2nd Floor

City: Montpelier

State_or_Province: VT

Postal_Code: 05620-2001

Country: USA

Contact_Voice_Telephone: (802) 585-0820

Contact_TDD/TTY_Telephone: None

Contact_Facsimile_Telephone:

Contact_Electronic_Mail_Address: vcgi@vermont.gov

Hours_of_Service: 9am - 5pm, M-F

Data_Set_Credit: University of Vermont Spatial Analysis Laboratory

Security_Information:

Security_Classification_System: N/A

Security_Classification: Unclassified

Security_Handling_Description: No Security Considerations

Native_Data_Set_Environment:

Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.1.1.3143

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Refer to Technical Report No. 76 "Mapping Impervious Surfaces in the Lake Champlain Basin" at <http://www.lcbp.org/wp-content/uploads/2013/11/76_MappingImperviousSurfaces.pdf> for details.

Logical_Consistency_Report:

Refer to report noted above, as well as, the metadata for the source 2011 NAIP imagery at https://vcgi.vermont.gov/warehouse/?datasetname=NAIP_1M_CIR_2011.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

The NAIP imagery has a 1 meter ground sample distance (GSD) with a horizontal accuracy; inspected locations match photo-identifiable ground control points with an accuracy of within 6 meters at a 95% confidence level.

Vertical_Positional_Accuracy:

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: University of Vermont Spatial Analysis Lab.

Publication_Date: 20131022

Publication_Time: unknown

Title: Mapping Impervious Surfaces in the Lake Champlain Basin

Geospatial_Data_Presentation_Form: digital vector data

Publication_Information:

Publication_Place: Burlington, VT

Publisher: Lake Champlain Basin Program

Source_Scale_Denominator:

Refer to Technical Report No. 76 "Mapping Impervious Surfaces in the Lake Champlain Basin" at <http://www.lcbp.org/wp-content/uploads/2013/11/76_MappingImperviousSurfaces.pdf> for details.

Type_of_Source_Media: Digital ortho-rectified imagery

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20110919

Time_of_Day: Unknown

Source_Currentness_Reference: Publication Date

Source_Citation_Abbreviation:

Source_Contribution:

Process_Step:

Process_Description: Initial posting of the data received from UVM-SAL.

Process_Date: 20140205

Process_Time: Unknown

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Mike Brouillette

Contact_Organization: VCGI

Contact_Position: GIS Database Administrator

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: 378969

Raster_Object_Information:

Raster_Object_Type: Grid Cell

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: State Plane Coordinate System

State_Plane_Coordinate_System:

SPCS_Zone_Identifier: 4400

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.999964

Longitude_of_Central_Meridian: -72.500000

False_Easting: 500000.000000

False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.001

Ordinate_Resolution: 0.001

Planar_Distance_Units: Meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137

Denominator_of_Flattening_Ratio: 1 / 298.25722210

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: Land Cover

Entity_Type_Definition: UTC

Attribute:

Attribute_Label: OBJECTID

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: Class_name

Attribute_Definition: Project specific

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Roads\Railroads

Enumerated_Domain_Value_Definition: Roads and railroads

Enumerated_Domain_Value_Definition_Source: Internal

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Other Impervious

Enumerated_Domain_Value_Definition:

Other impervious features such as buildings, parking lots, and driveways

Enumerated_Domain_Value_Definition_Source: Internal

Attribute:

Attribute_Label: Shape_Length

Attribute_Definition: Length of feature in internal units.

Attribute_Definition_Source: Esri

Attribute_Domain_Values:

Unrepresentable_Domain: Positive real numbers that are automatically 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 automatically generated.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: VT Center for Geographic Information

Contact_Address:

Address_Type: Mailing and Physical Address

Address: 1 National Life Dr, Dewey Building, 2nd Floor

City: Montpelier

State_or_Province: VT

Postal_Code: 05620-2001

Country: USA

Contact_Voice_Telephone: (802) 585-0820

Contact_TDD/TTY_Telephone: None

Contact_Facsimile_Telephone:

Contact_Electronic_Mail_Address: vcgi@vermont.gov

Hours_of_Service: 9am - 5pm, M-F

Resource_Description: layername

Distribution_Liability:

VCGI and the State of Vermont make no representations of any kind, including but not limited to the warranties of merchantability or fitness for a particular use, nor are any such warranties to be implied with respect to the data.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: SHP

Format_Specification: ESRI Shapefile format (compressed into ZIP file format)

Format_Information_Content: geospatial data

File_Decompression_Technique: ZIP extraction tool

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

https://maps.vcgi.vermont.gov/gisdata/vcgi/packaged_zips/LandLandcov_IMPERVLCB2011.zip

Access_Instructions: Download from web site.

Offline_Option:

Offline_Media: USB drive

Fees:

No charge when downloading from the internet, and when no custom processing is required.

Ordering_Instructions: Send an email describing data request to vcgi@vermont.gov

Turnaround: About 5 days.

Custom_Order_Process: Send an email describing data request to vcgi@vermont.gov

Technical_Prerequisites: GIS Software

Available_Time_Period:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20140205

Time_of_Day: Unknown

Metadata_Reference_Information:

Metadata_Date: 20140205

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: VT Center for Geographic Information

Contact_Person: GIS Database Administrator

Contact_Address:

Address_Type: Mailing and Physical Address

Address: 1 National Life Dr, Dewey Building, 2nd Floor

City: Montpelier

State_or_Province: VT

Postal_Code: 05620-2001

Country: USA

Contact_Voice_Telephone: (802) 585-0820

Contact_TDD/TTY_Telephone: None

Contact_Facsimile_Telephone:

Metadata_Standard_Name: FGDC Content Standards for Digital Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: Local time

Metadata_Access_Constraints: None

Metadata_Use_Constraints: None

Metadata_Security_Information:

Metadata_Security_Classification_System: N/A

Metadata_Security_Classification: Unclassified

Metadata_Security_Handling_Description: No security considerations