Sheriff Patrol Sectors of Loudoun County, 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, Department of Fire & Rescue

Publication_Date: now

Title: Sheriff Patrol Sectors of Loudoun County, VA

Geospatial_Data_Presentation_Form: vector digital data

Online_Linkage: see distribution information

Description:

Abstract:

The police zone defines each Loudoun County Sheriff deputies' patrol sectors. The patrol sector is the area for which a given unit is responsible. These sectors are identified by a Sheriff Substation followed by area number sequentially by tens. There are 5 substations: Admin, Sterling, Brambleton, Dulles South, and Round Hill. For 911 dispatching purposes, the incorporated Towns of Leesburg, Purcellville and Middleburg have their own unique sector numbers.

Purpose:

Police zones are used to define the extent of each police unit's jurisdiction and to quickly identify which patrol sector is responsible for the corresponding area when a call for assistance is received.

Supplemental_Information:

Data are stored in the corporate ArcSDE Geodatabase as a polygon 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: -77.963423

East_Bounding_Coordinate: -77.323924

North_Bounding_Coordinate: 39.328596

South_Bounding_Coordinate: 38.844273

Keywords:

Theme:

Theme_Keyword_Thesaurus: none; employee generated

Theme_Keyword: Police

Theme_Keyword: Sheriff

Theme_Keyword: Patrol sector

Theme_Keyword: Station

Place:

Place_Keyword_Thesaurus: none; employee generated

Place_Keyword: County

Place_Keyword: Loudoun

Place_Keyword: Virginia

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Categories

Theme_Keyword: society

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, Department of Fire, Rescue, & Emergency Management

Contact_Address:

Address_Type: mailing and physical

Address: 803 Sycolin Rd

City: Leesburg

State_or_Province: VA

Postal_Code: 20175

Country: US

Contact_Voice_Telephone: (703)777-0333

Contact_Facsimile_Telephone: (703)771-5359

Hours_of_Service: 8:00-5:00 EST, M-F

Native_Data_Set_Environment:

Microsoft Windows Server 2008 Version 6.0 (Build 6002) Service Pack 2; ESRI ArcGIS 10.0.3.3600

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Retention of attribute accuracy throughout the coverage to geodatabase feature class coversion process was ensured by a QA/QC programmatic check. To meet satisfactory QA/QC requirements the input coverage and output feature class must have, on a record by record basis, identical attribution when comparing all concatenated fields 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 coverage to geodatabase feature class conversion process was ensured by a QA/QC programmatic check. To meet satisfactory QA/QC requirements the input coverage and output feature class must have the same record total, and on a record by record basis, area, perimeter, and length differential of less than +/- 0.5%.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Loudoun County Sheriff's Department

Geospatial_Data_Presentation_Form: vector digital data

Type_of_Source_Media: None

Source_Contribution:

Line work for the creation of the patrol areas was determined by a group from the Sheriff's office working with CAD and GIS personnel.

Process_Step:

Process_Description:

Line work for the creation of the patrol areas was determined by a group from the Sheriff's office working with CAD and GIS personnel.

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County Sheriff's Office

Contact_Position: GIS & CAD personnel

Process_Step:

Process_Description:

This data set was part of a batch process that converted legacy data from ArcInfo coverage in Librarian to a single-tiled ArcInfo coverage in preparation for a final coversion to ArcSDE Geodatabase Feature Classes. Data were extracted from Librarian using the EXTRACT TOPOLOGICAL command. Multi-tiled data sets were extracted into multiple coverages and then combined based on the feature type(s). Layers with both polygon and arc feature classes were processed with the Arc commands, MAPJOIN and DISSOLVE. Arc feature classes alone were processed with the Arc commands, APPEND and DISSOLVE. Layers with both arc and point feature classes and point feature classes alone were processed with the Arc command, APPEND. When used, the Arc command, DISSOLVE, was given with the <#all> option. All coverages were then reprojected to HARN 83 using the following .prj file specifications: INPUT PROJECTION STATEPLANE UNITS FEET ZONE 5551 DATUM NAD27 NADCON PARAMETERS OUTPUT PROJECTION STATEPLANE UNITS FEET FIPSZONE 4501 DATUM HPGN NADCON PARAMETERS END This dataset was then converted to a feature class in a geodatabase in ArcSDE.

Process_Date: 20040101

Process_Time: 000000

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

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

Contact_Position: GIS Systems Analyst

Process_Step:

Process_Description:

Sheriff Sectors is maintained on a regular basis as new roads are added or existing roads are re-aligned.

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Loudoun County Sheriff's Office

Contact_Position: GIS & CAD personnel

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: GT-polygon composed of chains

Point_and_Vector_Object_Count: 34

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: NAD 1983 HARN StatePlane Virginia North FIPS 4501 Feet

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: Foot_US

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.PSPOLICE_POLY

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: PS_PDISTRICT

Attribute_Definition: Unique code to identify police district

Attribute_Definition_Source: Department of Fire, Rescue, and Emergency Management

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: SO

Enumerated_Domain_Value_Definition: Sheriff's office

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: LB

Enumerated_Domain_Value_Definition: Leesburg Police

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: MB

Enumerated_Domain_Value_Definition: Middleburg Police

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: PV

Enumerated_Domain_Value_Definition: Purcellville Police

Attribute:

Attribute_Label: PDISTRICT_NAME

Attribute_Definition: Full name of police district

Attribute_Definition_Source: Department of Fire, Rescue, and Emergency Management

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Sheriff

Enumerated_Domain_Value_Definition: Sheriff's Office

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Leesburg

Enumerated_Domain_Value_Definition: Leesburg Police

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Middleburg

Enumerated_Domain_Value_Definition: Middleburg Police

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Purcellville

Enumerated_Domain_Value_Definition: Purcellville Police

Attribute:

Attribute_Label: PDISTRICT_ABBREV

Attribute_Definition: Abbreviation for police sector name

Attribute_Definition_Source: Department of Fire, Rescue, and Emergency Management

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: LB

Enumerated_Domain_Value_Definition: Leesburg Police

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: MB

Enumerated_Domain_Value_Definition: Middleburg Police

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: PV

Enumerated_Domain_Value_Definition: Purcellville Police

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: SO

Enumerated_Domain_Value_Definition: Sheriff's Office

Attribute:

Attribute_Label: PS_PD_AREA

Attribute_Definition: Unique Sheriff sector ID number

Attribute_Definition_Source: Department of Fire, Rescue, and Emergency Management

Attribute_Domain_Values:

Unrepresentable_Domain:

This consists of Sheriff Substation followed by area number sequentially by tens.

Attribute:

Attribute_Label: PS_PD_ZONE

Attribute_Definition: This is a required field for CAD (Computer Aided Dispatch).

Attribute_Definition_Source: Department of Fire, Rescue, and Emergency Management

Attribute_Domain_Values:

Unrepresentable_Domain: User defined text

Attribute:

Attribute_Label: PS_PD_SSTATIONS

Attribute_Definition:

This is a required field for CAD. It is used to identify the station relationship to the sector in CAD.

Attribute_Definition_Source: Department of Fire, Rescue, and Emergency Management

Attribute_Domain_Values:

Unrepresentable_Domain:

The number in this field corresponds to the first number of the Sheriff sector.

Attribute:

Attribute_Label: PD_SSTATIONS_NAM

Attribute_Definition: Descriptive name of responsible station

Attribute_Definition_Source: Department of Fire, Rescue, and Emergency Management

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: CLARKE COUNTY

Enumerated_Domain_Value_Definition: Clarke County, VA

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: DULLES_SOUTH

Enumerated_Domain_Value_Definition: Dulles Aiport & surrounding area station

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: EASTERN_LOUDOUN

Enumerated_Domain_Value_Definition: Eastern Loudoun County

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: JEFFERSON WV

Enumerated_Domain_Value_Definition: Jefferson County, WV station

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: UNIVERSITY

Enumerated_Domain_Value_Definition: Major University area station

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: WESTERN_LOUDOUN

Enumerated_Domain_Value_Definition: Western Loudoun Couny station

Attribute:

Attribute_Label: PS_PDID

Attribute_Definition: This is a required field for CAD

Attribute_Definition_Source: Department of Fire, Rescue, and Emergency Management

Attribute_Domain_Values:

Unrepresentable_Domain: User defined text

Attribute:

Attribute_Label: PS_SECTNUM

Attribute_Definition: Number of patrol sector

Attribute_Definition_Source: Loudoun County

Attribute_Domain_Values:

Unrepresentable_Domain: Computer generated numbers

Attribute:

Attribute_Label: SHAPE

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: DB2GSE.ST_Area(SHAPE)

Attribute_Definition: Area of patrol sector in internal units

Attribute_Definition_Source: Loudoun County

Attribute_Domain_Values:

Unrepresentable_Domain: Positive whole numbers automatically generated

Attribute:

Attribute_Label: DB2GSE.SdeLength(SHAPE)

Attribute_Definition: Perimeter of patrol sector in internal units

Attribute_Definition_Source: Loudoun County

Attribute_Domain_Values:

Unrepresentable_Domain: Positive whole numbers automatically generated

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: 1 Harrison Street S.E., 2nd floor

Address: MS 65

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: GDB

Format_Specification: ESRI Personal Geodatabase Feature Class

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: 20120619

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.