Stormwater Manholes of Lovettsville, VA

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:

Loudoun County, Virginia, Office of Mapping and Geographic Information (OMAGI)

Publication_Date: 20100629

Title: Stormwater Manholes of Lovettsville, VA

Geospatial_Data_Presentation_Form: vector digital data

Other_Citation_Details:

For futher information on storm manholes within the town of Lovettsville, contact the Town office at 540-822-5788.

Description:

Abstract:

This feature class identifies all of the town's stormwater management manholes in the town of Lovettsville. The feature class identifies the width and depth of each stormwater manhole.

Purpose:

Storm manholes were collected at the request of the town of Lovettsville for town mapping purposes. They can be used in town related planning projects to map the present infrastructure of the town.

Supplemental_Information:

Data are stored in the corporate ArcSDE Geodatabase as a point feature class. The coordinate system is Virginia State Plane (North), Zone 4501, datum NAD83 HARN (vertical datum, if applicable, NAVD88), US Survey foot units.

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -77.647233

East_Bounding_Coordinate: -77.632739

North_Bounding_Coordinate: 39.284552

South_Bounding_Coordinate: 39.261407

Keywords:

Theme:

Theme_Keyword_Thesaurus: none; Employee generated

Theme_Keyword: drainage

Theme_Keyword: manholes

Theme_Keyword: VDOT

Theme_Keyword: stormwater

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Categories

Theme_Keyword: utilitiesCommunication

Place:

Place_Keyword_Thesaurus: none; Employee generated

Place_Keyword: County

Place_Keyword: Loudoun

Place_Keyword: Virginia

Access_Constraints: None

Use_Constraints:

These data were generated for use by Loudoun County and are available to the public. These data are intended for use at 1:2400 scale or smaller. Acknowledgement of Loudoun County would be appreciated in products derived from this data.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County, VA, OMAGI

Contact_Position: Public Information Counter

Contact_Address:

Address_Type: mailing and physical

Address: MS 65

Address: 1 Harrison Street SE, 2nd Floor

City: Leesburg

State_or_Province: VA

Postal_Code: 20175

Country: US

Contact_Voice_Telephone: (703)771-5778

Contact_Facsimile_Telephone: (703)771-5075

Contact_Electronic_Mail_Address: mapping@loudoun.gov

Hours_of_Service: 8:00-4:30 EST, M-F

Native_Data_Set_Environment:

Microsoft Windows Server 2008 Version 6.0 (Build 6002) Service Pack 2; ESRI ArcGIS 10.0.5.4400

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Retention of attribute accuracy throughout the GPS data file to geodatabase feature class coversion process was ensured by a manual QA/QC programmatic check. To meet satisfactory QA/QC requirements the input data file and output feature class must have, on a record by record basis, identical attribution to all the user-defined attribution.

Logical_Consistency_Report: Topologically clean

Completeness_Report:

Features may have been eliminated or generalized due to scale and intended use. To assist Loudoun County, Virginia in the maintenance of the data, please provide any information concerning discovered errors, omissions, or other discrepancies found in the data.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Retention of coordinate accuracy throughout the GPS data file to geodatabase feature class conversion process ensured by following a specific differential correction process with GPS Pathfinder software. Base files for differential correction are downloaded from a Continuously Operating Reference Station (CORS) at Gaithersburg, MD. The GPS data files are differentially corrected using the Standard Automatic Code Correction Process. This process results in sub-meter accuracy for corrected data files; predominately at a 0.5-1 meter distance, with some files at 30-50 cm & 1-2 meters. The corrected files are then exported using the County's standary projection & copied into the Lovettsville PGDB & appropriate feature class. To meet satisfactory QA/QC requirements the input GPS file and output feature class must have the same record total, and on a record by record basis, same location as corrected GPS files. Features may be spatially adjusted using 2007 digital photography if higher sub-meter accuracy places them incorrectly.

Lineage:

Source_Information:

Type_of_Source_Media: None

Source_Contribution:

Request for assistance in data collection by Keith Markel, Lovettsville Town Manager in January 2008

Process_Step:

Process_Description:

GPS collection of all existing stormwater manholes in the town of Lovettsville with Trimble GPS unit. A GPS data dictionary was created and used to collect targeted attribute values for each feature type collected.

Process_Date: 20080310

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County, VA, OMAGI

Contact_Position: GIS Specialist

Process_Step:

Process_Description:

GPS data downloaded from unit & then differentially corrected in GPS Pathfinder using base files from CORS at Gaithersburg, MD. The Standard Automatic Code Correction process was used to correct the data, which resulted in a predominately sub-meter accuracy of .5 to 1 meters (1.5 to 3 feet). The differentially corrected data was then exported from Pathfinder as a sample shapefile & copied into the existing Lovettsville PGDB & corresponding feature class.

Process_Date: 20080317

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County, VA, OMAGI

Contact_Position: GIS Specialist

Process_Step:

Process_Description:

GPS update/collection of new manhole along the new N Church St near the town square. A data dictionary was used to collect the targeted attrbute values. GPS data downloaded from unit & then differentially corrected in GPS Pathfinder using base files from CORS at Hagerstown, MD. The Standard Automatic Code Correction process was used to correct the data, which resulted in a predominately sub-meter accuracy of .5 to 1 meters (1.5 to 3 feet).

Process_Date: 20100611

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County, VA, OMAGI

Contact_Position: GIS Specialist

Process_Step:

Process_Description:

GPS update/collection of existing manholes throughout Lovettsville that were unable to be located in 2008. A data dictionary was used to collect the targeted attrbute values. GPS data downloaded from unit and then differentially corrected in GPS Pathfinder using base files from CORS at Hagerstown, MD. The Standard Automatic Code Correction process was used to correct the data, which resulted in a predominately sub-meter accuracy of .5 to 1 meters (1.5 to 3 feet)

Process_Date: 20101026

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County, VA, OMAGI

Contact_Position: GIS Specialist

Process_Step:

Process_Description:

GPS update/collection of new storm manholes in the newly developed area of the town along Eisentown Dr & north of Kimberly Kristin Wy on the western side of the town.

Process_Date: 20140623

Spatial_Data_Organization_Information:

Indirect_Spatial_Reference: Loudoun County

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Entity point

Point_and_Vector_Object_Count: 406

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: Lambert Conformal Conic

Lambert_Conformal_Conic:

Standard_Parallel: 38.03333333333333

Standard_Parallel: 39.2

Longitude_of_Central_Meridian: -78.5

Latitude_of_Projection_Origin: 37.66666666666666

False_Easting: 11482916.66666666

False_Northing: 6561666.666666666

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.00020833333333333297

Ordinate_Resolution: 0.00020833333333333297

Planar_Distance_Units:

Geodetic_Model:

Horizontal_Datum_Name: D North American 1983 HARN

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: GISDBB.GISBROW.LVILLE_STORM_MANHOLES_POINT

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: SM_DIAMETER

Attribute_Definition: Diameter of manhole lid

Attribute_Definition_Source: Loudoun County

Attribute_Domain_Values:

Unrepresentable_Domain: User generated text

Attribute:

Attribute_Label: SM_DEPTH

Attribute_Definition: Depth of manhole

Attribute_Definition_Source: Loudoun County

Attribute_Domain_Values:

Unrepresentable_Domain: User generated text

Attribute:

Attribute_Label: SM_UPD_SOURCE

Attribute_Definition: Source by which feature class was created or modified

Attribute_Definition_Source: Loudoun County

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 0

Enumerated_Domain_Value_Definition: Undetermined

Enumerated_Domain:

Enumerated_Domain_Value: 1

Enumerated_Domain_Value_Definition: Legacy

Enumerated_Domain:

Enumerated_Domain_Value: 2

Enumerated_Domain_Value_Definition: County

Enumerated_Domain:

Enumerated_Domain_Value: Contract

Attribute:

Attribute_Label: SM_UPD_DATE

Attribute_Definition: Feature creation or modification date

Attribute_Definition_Source: Loudoun County

Attribute_Domain_Values:

Unrepresentable_Domain: User generated text

Attribute:

Attribute_Label: SM_UPD_USER

Attribute_Definition:

Not for public distribution. Internal User ID of editor creating or modifying a feature

Attribute_Definition_Source: Loudoun County

Attribute:

Attribute_Label: SHAPE

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County, VA, OMAGI

Contact_Position: Public Information Counter

Contact_Address:

Address_Type: mailing and physical

Address: MS 65

Address: 1 Harrison Street SE, 2nd Floor

City: Leesburg

State_or_Province: VA

Postal_Code: 20175

Country: US

Contact_Voice_Telephone: (703)771-5778

Contact_Facsimile_Telephone: (703)771-5075

Contact_Electronic_Mail_Address: mapping@loudoun.gov

Hours_of_Service: 8:00-4:30 EST, M-F

Distribution_Liability: See access and use constraints information.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: DXF

Format_Specification: AutoCad Digital Exchange File

Digital_Transfer_Option:

Offline_Option:

Offline_Media: dvd

Fees:

Loudoun County distributes spatial data in ArcGIS database or shapefile & DXF format for the cost of reproduction. Countywide spatial datasets may be purchased for $22 per DVD for up to 4.5 GB of data. There is a $100 surcharge to purchase countywide topography, and a $3 charge if the item is to be mailed. If the customer wants the data in DXF format and/or would like OMAGI to custom select specific geographic areas of the County, there is an additional $7 per 15 minute increment labor charge. Select aerial imagery is also available.

Ordering_Instructions:

Size limit: 4.5 GB. Visit our website at: <http://www.loudoun.gov/omagi>, click on "Loudoun County Mapping Documents & Order Forms." The "Forms" directory will lead you to custom & standard (countywide) data order forms. Hardcopy maps may also be available; please contact the Mapping Office Public Information Counter for more information regarding all data requests.

Metadata_Reference_Information:

Metadata_Date: 20140828

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County, VA, OMAGI

Contact_Position: Metadata Specialist

Contact_Address:

Address_Type: mailing and physical

Address: MS 65

Address: 1 Harrison Street SE, 2nd Floor

City: Leesburg

State_or_Province: VA

Postal_Code: 20175

Country: US

Contact_Voice_Telephone: (703)771-5778

Contact_Facsimile_Telephone: (703)771-5075

Contact_Electronic_Mail_Address: mapping@loudoun.gov

Hours_of_Service: 8:00-4:30 EST, M-F

Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Use_Constraints:

This metadata reflects the source Geodatabase format and specific elements may not apply if your data is exported to SHP or DXF products. User must be aware that changes to data schema occur during data export that may not be reflected in this metadata, which represents Loudoun County's corporate geodatabase. Acknowledgement of Loudoun County would be appreciated in the use of this metadata.