UtilityTransmit_ELTRN

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: GIS Database Administrator

Publication_Date: 20030611

Publication_Time: unknown

Title: UtilityTransmit_ELTRN

Edition: 2003

Geospatial_Data_Presentation_Form: vector digital data

Series_Information:

Series_Name: Electric Transmission Line corridors

Issue_Identification: 2003

Publication_Information:

Publication_Place: Waterbury, VT 05676

Publisher: GIS Database Administrator

Other_Citation_Details: Tile Structure - STATE

Online_Linkage:

<http://vcgi.vermont.gov/warehouse/?layer=UtilityTransmit_ELTRN>

Online_Linkage:

<http://vcgi.vermont.gov/warehouse/?layer=UtilityTransmit_ELTRN&mapit=yes>

Online_Linkage:

<http://vcgi.vermont.gov/warehouse/?servicename=DATAWARE_VCGI&VERSION=1.1.1&request=getmap&BBOX=-73.45416,42.72279,-71.46528,45.018356&SRS=EPSG:4326&LAYERS=UTILITY_ELTRN_LINE&WIDTH=300&HEIGHT=400&FORMAT=image/gif>

Online_Linkage:

<http://vcgi.vermont.gov/warehouse/?servicename=DATAWARE_VCGI&VERSION=1.1.1&request=getmap&BBOX=-73.45416,42.72279,-71.46528,45.018356&SRS=EPSG:4326&LAYERS=UTILITY_ELTRN_POINT&WIDTH=300&HEIGHT=400&FORMAT=image/gif>

Description:

Abstract:

The ELTRN layer depicts electric transmission line corridors in Vermont. Various methods have been used to digitize features. The data layer should be used with caution. It has not been consistenly maintained since its initial release in 1992, and already had some data quality issues when it was released in 1992.
Please make note that the UtilityTransmit_VELCOTRANS layer has more accurate and up-to-date information for high voltage transmission lines in Vermont (those maintained by VELCO).

Purpose: Depict Electric Transmission Line Corridors in Vermont.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 19740000

Beginning_Time: Unknown

Ending_Date: 20030000

Ending_Time: Unknown

Currentness_Reference: Ground Condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: Unknown

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -73.454162

East_Bounding_Coordinate: -71.465281

North_Bounding_Coordinate: 45.018361

South_Bounding_Coordinate: 42.722789

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: utilitiesCommunication

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: Electric Transmission Line corridors

Theme_Keyword: Electric

Theme_Keyword: Power

Theme_Keyword: Utilities

Theme_Keyword: Transmission Lines

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Vermont

Temporal:

Temporal_Keyword_Thesaurus: None

Access_Constraints:

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.

Use_Constraints:

Caution should be used when using this layer. It is generally pretty good for creating statewide scale maps.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: GIS Database Administrator

Contact_Organization: VT Center for Geographic Information

Contact_Position: Manager

Contact_Address:

Address_Type: Mailing and Physical Address

Address: 58 South Main Street, Suite 2

City: Waterbury

State_or_Province: VT

Postal_Code: 05676

Country: USA

Contact_Voice_Telephone: 802/882-3000

Contact_TDD/TTY_Telephone: None

Contact_Facsimile_Telephone: 802/882-3001

Hours_of_Service: 9am - 5pm, M-F

Browse_Graphic:

Browse_Graphic_File_Name:

<http://vcgi.vermont.gov/warehouse/?servicename=DATAWARE_VCGI&VERSION=1.1.1&request=getmap&BBOX=-73.45416,42.72279,-71.46528,45.018356&SRS=EPSG:4326&LAYERS=UTILITY_ELTRN_LINE&WIDTH=300&HEIGHT=400&FORMAT=image/gif>

Browse_Graphic_File_Name:

<http://vcgi.vermont.gov/warehouse/?servicename=DATAWARE_VCGI&VERSION=1.1.1&request=getmap&BBOX=-73.45416,42.72279,-71.46528,45.018356&SRS=EPSG:4326&LAYERS=UTILITY_ELTRN_POINT&WIDTH=300&HEIGHT=400&FORMAT=image/gif>

Browse_Graphic_File_Description: GIF

Browse_Graphic_File_Type: GIF

Data_Set_Credit: Greenhorne & O'Mara, Inc. - VCGI - Windham County RPC and CVPS

Security_Information:

Security_Classification_System: N/A

Security_Classification: Unclassified

Security_Handling_Description: No security considerations

Native_Data_Set_Environment: ARC/INFO

Cross_Reference:

Citation_Information:

Originator: GIS Database Administrator

Publication_Date: 19921212

Publication_Time: unknown

Title: Electric Transmission Line corridors

Edition: 1.0

Geospatial_Data_Presentation_Form: vector digital data

Publication_Information:

Publication_Place: Waterbury, VT 05676

Publisher: GIS Database Administrator

Other_Citation_Details: UtilityTransmit_ELTRN

Online_Linkage: <http://vcgi.vermont.gov/>

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

2003 UPDATE - Updates provided by Windham County RPC were not QA/QCed by VCGI. These includes arcs with a SRCORG = 21. However, it is assumed that these attributes are in good order.
1992 RELEASE - All lines were checked on translucent paper orthophoto check plots by VCGI technicians. In many cases line locations were very approximate, and an appropriate accuracy code was assigned (item LOCMETH). Attributes for line kilovolts (ELKV) and the visible corridor width (ELWIDTH) were verified on the check plots. The linework was brought together from ORTHO64 tiles into a statewide coverage and statewide checkplots were produced. The linework was visually checked against available source maps (see Completeness_Report), and it was noted that several short sections had not been digitized (these remain undigitized). All dangling nodes were resolved and line ownership (ELOWNER) verified to the greatest degree possible with the given source maps. Unnecessary pseudo nodes were then removed. A separate statewide checkplot was used to verify substation names.

Logical_Consistency_Report:

In most cases, each major transmission line is represented even where there are two transmission lines in the same corridor, but in some cases only one corridor centerline was digitized for sections occupied by multiple transmission lines.

Completeness_Report:

2003 UPDATE - Updates provided by Windham County RPC were not QA/QCed by VCGI. These includes arcs with a SRCORG = 21. However, the data was developed by WRC and CVPS using GPS in the field. As a result it is assumed that these arcs are complete.
1992 RELEASE - Paper and RC Kodak RF 5000 scale orthophotos were used to determine transmission line corridor center lines. Attributes were taken from a Public Service Board "Vermont Electrical Systems Planning" map (May 1974, revised 10-30-1986), including a separate inset map of the Burlington area, and a VELCO "1956-1990" map.
Line accuracy standards were set as being within the confines of the visible transmission line corridor. All digitized transmisson lines were checked for line and attribute accuracy by VCGI. Line work was checked with translucent paper proof plots anchored to the source photos with 1000 meter tics. The accuracy of much of the linework is very questionable. Many transmission lines were not visible on the photos where they crossed urban or open lands, or due to being constructed after the orthophotos were taken. For about one third of the digitized lines, transmission line locations were not clearly visible on the photos, thus the line accuracy is very approximate (as coded in the accuracy attribute LOCMETH). Where the corridors were clearly visible, the digitized lines generally fall close to the true corridor centerlines. About a dozen short sections of line were apparently not digitized, based on the PSB map; these have not yet been digitized. Transmission line arcs were digitized with the RF 5000 scale roads data (coverage RDSnn), and edgematched at the orthophoto boundaries with a complex algorithm, based on the distance between arc endpoints in adjoining coverages and on the arc attributes. Adjustments were made at photo edges (both automatically and manually) when needed, so minimal line error may have been introduced at the photo edges in some cases. Also, short arc sections (generally less than 1 cm equals 50 m on the ground) were added when needed at the corners of the photos without reference to the source maps. Major electric transmission lines include "transmission lines", which carry 115 KV, 230 KV, or 345 KV, and "sub transmission lines" which carry form 33KV to 69 KV. Primary distribution (typically 13.2 KV) and secondary distribution (220 V) lines are not included in this datalayer.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Line accuracy standards were set as being within the confines of the visible transmission line corridor. All digitized transmisson lines were checked for line and attribute accuracy by VCGI. Line work was checked with translucent paper proof plots anchored to the source photos with 1000 meter tics. The accuracy of much of the linework is very questionable. Many transmission lines were not visible on the photos where they crossed urban or open lands, or due to being constructed after the orthophotos were taken. For about one third of the digitized lines, transmission line locations were not clearly visible on the photos, thus the line accuracy is very approximate (as coded in the accuracy attribute LOCMETH). Where the corridors were clearly visible, the digitized lines generally fall close to the true corridor centerlines. About a dozen short sections of line were apparently not digitized, based on the PSB map; these have not yet been digitized.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: GIS Database Administrator

Publication_Date: 19921212

Publication_Time: unknown

Title: Original Electric Transmission Line corridors data

Edition: 1992

Geospatial_Data_Presentation_Form: vector digital data

Series_Information:

Series_Name: Original Electric Transmission Line corridors data

Issue_Identification: 1992

Publication_Information:

Publication_Place: Waterbury, VT 05676

Publisher: GIS Database Administrator

Other_Citation_Details: UtilityTransmit_ELTRN

Source_Scale_Denominator: 5000

Type_of_Source_Media: Paper prints and RC Kodak (orthophotos)

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1974-90. See Associated Files.1974-90.

Time_of_Day: Unknown

Source_Currentness_Reference: Publication Date

Source_Citation_Abbreviation: UtilityTransmit_ELTRN

Source_Contribution: VCGI, Greenhorne & O'Mara, Inc.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Windham County RPC and CVPS

Publication_Date: 20030000

Publication_Time: unknown

Title: Updates to CVPS lines

Edition: 2003

Geospatial_Data_Presentation_Form: vector digital data

Series_Information:

Series_Name: Updates to CVPS lines

Issue_Identification: 2003

Source_Scale_Denominator: NA

Type_of_Source_Media: GPS

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2002-2003

Time_of_Day: Unknown

Source_Contribution: Windham RPC and CVPS

Process_Step:

Process_Description:

Original data available for distribution. Operator - Steve Bower, VCGI

Process_Date: 19921212

Process_Step:

Process_Description:

Substation names were made unique by adding numbers to previously non-unique names (e.g. 'HYDRO PLANT 1', 'HYDRO PLANT 2', etc.) Operator - Steve Bower, VCGI

Process_Date: 19930211

Process_Step:

Process_Description:

Generated new printed documentation because ELACC attribute and previous update notes misssing. Operator - Steve Sharp, VCGI

Process_Date: 19980121

Process_Step:

Process_Description:

Updates provided by Jeff Nugent (Windham Regional Commission) were integreated into the master UtilityTransmit_ELTRN layer. New lines added in Whitingham and Winhall-Jamaica. Operator - Steve Sharp, VCGI

Process_Date: 19980121

Process_Step:

Process_Description:

Updates provided by Jeff Nugent (Windham Regional Commission) were integreated into the master UtilityTransmit_ELTRN layer. Updates to CVPS lines (SRCORG = 21). VCGI also renamed ELACC to LOCMETH and added a SRCORG attribute. Operator - Steve Sharp, VCGI

Process_Date: 20030611

Spatial_Data_Organization_Information:

Indirect_Spatial_Reference: LINK

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Elliptical arc

Point_and_Vector_Object_Count: 775

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: 4400 (USGS), 5526 (ESRI)

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.99996

Longitude_of_Central_Meridian: -072.500000

Latitude_of_Projection_Origin: +42.500000

False_Easting: 500000

False_Northing: 0.000

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:

Overview_Description:

Entity_and_Attribute_Overview:

ATTRIBUTE TABLES: ELTRN contains an Arc Attribute Table (AAT) and a Point Attribute Table (PAT) for substation points.

Detailed_Description:

Entity_Type:

Entity_Type_Label: ELTRN.AAT

Entity_Type_Definition: Arc/line Attribute table

Entity_Type_Definition_Source: VCGI

Attribute:

Attribute_Label: ELOWNER

Attribute_Definition: Electric Transmission Line Owner.

Attribute_Definition_Source: Public Service Board & VELCO maps

Attribute_Domain_Values:

Codeset_Domain:

Codeset_Name: Line ownership

Codeset_Source: Public Service Board & VELCO

Attribute_Value_Accuracy_Information:

Attribute_Value_Accuracy: See Explanation; below

Attribute_Value_Accuracy_Explanation:

Transmission line owners were determined from a Public Service Board "Vermont Electrical Systems Planning" map (May 1974, revised 30 OCT 1986), including a separate inset map of the Burlington area, and a VELCO "1956-1990" map. Line ownership was difficult to interpret in urban areas and in areas where lines of different ownership come together.

Attribute:

Attribute_Label: ELKV

Attribute_Definition: Electric transmission line voltage (in kilovolts).

Attribute_Definition_Source: Public Service Board & VELCO maps

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Kilovolts

Enumerated_Domain_Value_Definition: a measurement of electricity

Enumerated_Domain_Value_Definition_Source: some scientist

Attribute_Value_Accuracy_Information:

Attribute_Value_Accuracy: See Explanation;

Attribute_Value_Accuracy_Explanation:

See ELOWNER for source map details. 999 is unknown (about 60 out of 2650 km).

Attribute:

Attribute_Label: ELWIDTH

Attribute_Definition: Electric transmission line width (in meters).

Attribute_Definition_Source: RF 5000 scale orthophotos

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Meters

Enumerated_Domain_Value_Definition: a measurement of distance

Enumerated_Domain_Value_Definition_Source: some scientist

Attribute_Value_Accuracy_Information:

Attribute_Value_Accuracy: See explanation; below

Attribute_Value_Accuracy_Explanation:

The approximate transmission line corridor width, estimated from the RF 5000 scale orthophotos. Corridor widths were best determined in wooded areas. 999 is Unknown width, primarily in open and urban areas (about 680 out of 2650 km).

Attribute:

Attribute_Label: LOCMETH

Attribute_Definition: Location method - method used to digitize line

Attribute_Definition_Source: VCGI

Attribute_Value_Accuracy_Information:

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 1

Enumerated_Domain_Value_Definition:

RF 5K orthophoto. Electric transmission line corridor clearly visible on the orthophoto.

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 2

Enumerated_Domain_Value_Definition:

Approximated. Corridor not clearly visible on the orthophoto and therefore corridor location has been approximated based on the best available information at the time of digitizing.

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 3

Enumerated_Domain_Value_Definition: Collected in the field using GPS

Attribute:

Attribute_Label: SRCORG

Attribute_Definition:

Organization/project which created/updated the structure location (point). This attribute identifies the organization or project which digitized the feature. When a feature is digitized or moved, the SRCORG code should be updated. The SRCORG codes will serve as a record of "who did it". 1 VCGI 10 Addison County RPC 11 Bennington County RC 12 Central VT RPC 13 Chittenden County RPC 14 Northwest RPC 15 Lamoille County PC 16 Northeast VT Development Assoc. 17 Rutland RPC 18 Southern Windsor RPC 19 Two Rivers-Ottauquechee RPDC 20 Upper Valley-Lake Sunapee RPC 21 Windham PC

Attribute_Definition_Source: Assigned when digitized or moved.

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1

Range_Domain_Maximum: 21

Detailed_Description:

Entity_Type:

Entity_Type_Label: ELTRN.PAT

Entity_Type_Definition: Point Attribute table

Entity_Type_Definition_Source: VCGI

Attribute:

Attribute_Label: SUBST

Attribute_Definition:

Electric transmission line substation number. It comes from a Public Service Board "Vermont Electrical Systems Planning" map (May 1974, revised 30 OCT 1986), including a separate inset map of the Burlington area.

Attribute_Definition_Source: Public Service Board Map

Attribute_Domain_Values:

Codeset_Domain:

Codeset_Name: Substation name

Codeset_Source: Public Service Board

Attribute:

Attribute_Label: SUBNAME

Attribute_Definition:

Electric transmission line substation name. It comes from a Public Service Board "Vermont Electrical Systems Planning" map (May 1974, revised 30 OCT 1986), including a separate inset map of the Burlington area.

Attribute_Definition_Source: Public Service Board Map

Attribute_Domain_Values:

Codeset_Domain:

Codeset_Name: Substation name

Codeset_Source: Public Service Board

Attribute:

Attribute_Label: LOCMETH

Attribute_Definition: Location method - method used to digitize line

Attribute_Definition_Source: VCGI

Attribute_Value_Accuracy_Information:

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 1

Enumerated_Domain_Value_Definition:

RF 5K orthophoto. Electric transmission line corridor clearly visible on the orthophoto.

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 2

Enumerated_Domain_Value_Definition:

Approximated. Corridor not clearly visible on the orthophoto and therefore corridor location has been approximated based on the best available information at the time of digitizing.

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 3

Enumerated_Domain_Value_Definition: Collected in the field using GPS

Attribute:

Attribute_Label: SRCORG

Attribute_Definition:

Organization/project which created/updated the structure location (point). This attribute identifies the organization or project which digitized the feature. When a feature is digitized or moved, the SRCORG code should be updated. The SRCORG codes will serve as a record of "who did it". 1 VCGI 10 Addison County RPC 11 Bennington County RC 12 Central VT RPC 13 Chittenden County RPC 14 Northwest RPC 15 Lamoille County PC 16 Northeast VT Development Assoc. 17 Rutland RPC 18 Southern Windsor RPC 19 Two Rivers-Ottauquechee RPDC 20 Upper Valley-Lake Sunapee RPC 21 Windham PC

Attribute_Definition_Source: Assigned when digitized or moved.

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 1

Range_Domain_Maximum: 21

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: VT Center for Geographic Information

Contact_Address:

Address_Type: Mailing and Physical Address

Address: 58 South Main Street, Suite 2

City: Waterbury

State_or_Province: VT

Postal_Code: 05676

Country: USA

Contact_Voice_Telephone: 802/882-3000

Contact_TDD/TTY_Telephone: None

Contact_Facsimile_Telephone: 802/882-3001

Contact_Electronic_Mail_Address: info@vcgi.uvm.edu

Hours_of_Service: 9am - 5pm, M-F

Resource_Description: UtilityTransmit_ELTRN

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 to ZIP format)

Format_Information_Content: geospatial data

File_Decompression_Technique: ZIP decompression software

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

<http://vcgi.vermont.gov/warehouse/?layer=UtilityTransmit_ELTRN>

Access_Instructions: Download from web site.

Offline_Option:

Offline_Media: CD-ROM

Offline_Option:

Offline_Media: 3-1/2 inch floppy disk

Offline_Option:

Offline_Media: 4 mm cartridge tape

Offline_Option:

Offline_Media: 8 mm cartridge tape

Fees:

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

Ordering_Instructions:

Download from web site or mail-fax a copy of the VCGI 'Data Request Form' which is available from the VGIS web site <http://vcgi.vermont.gov/warehouse/order_forms>

Turnaround: About 5 days.

Custom_Order_Process:

Mail or Fax a copy of the VCGI 'Data Request Form' which is available from <http://vcgi.vermont.gov/warehouse/order_forms>

Technical_Prerequisites: ESRI Arc/Info, ArcView, or ArcExplorer software.

Available_Time_Period:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20001023

Time_of_Day: Unknown

Metadata_Reference_Information:

Metadata_Date: 20030611

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: VT Center for Geographic Information

Contact_Address:

Address_Type: Mailing and Physical Address

Address: 58 South Main Street, Suite 2

City: Waterbury

State_or_Province: VT

Postal_Code: 05676

Country: USA

Contact_Voice_Telephone: (802)882-3000

Contact_TDD/TTY_Telephone: None

Contact_Facsimile_Telephone: (802)882-3001

Hours_of_Service: 9am - 5pm, M-F

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: None

Metadata_Security_Classification: Unclassified

Metadata_Security_Handling_Description: No security considerations