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  • FGDC

Windham County, Vermont roads, 2014

  • Identification Information
  • Data Quality Information
  • Spatial Data Organization Information
  • Spatial Reference Information
  • Entity and Attribute Information
  • Distribution Information
  • Metadata Reference Information
Identification Information
Citation
Originator
Enhanced 9-1-1 Board
Publication Date
20121101
Publication Time
unknown
Title
Windham County, Vermont roads, 2014
Edition
2012A
Geospatial Data Presentation Form
vector digital data
Series Information
Series Name
E911 Road centerline data
Issue Identification
2012A
Publication Information
Publication Place
90 Throckmorton Ave #26, Mill Valley, CA, 94941, US
Publisher
Boundary Solutions, Inc.
Other Citation Details
Tile Structure - STATE
Online Linkage
https://figgy.princeton.edu/downloads/b8442a65-29be-4121-ac05-753bdf04d747/file/b9ecad6c-81a5-49a0-9ffe-d1753f4a65fa
Abstract
Roads and highways in Windham County, Vermont, 2014.
Purpose
For displaying roads with GIS software.
Temporal Extent
Currentness Reference
Publication date.
Time Instant
20121101
Bounding Box
West
-73.009820
East
-72.433997
North
43.262934
South
42.726063
Theme Keyword
roads
highways
Theme Keyword Thesaurus
None
Theme Keyword
transportation
Theme Keyword Thesaurus
ISO 19115 Topic Categories
Place Keyword
Vermont
Windham County
Windham
Place Keyword Thesaurus
None
Temporal Keyword
2014
Temporal Keyword Thesaurus
None
Access Restrictions
None
Use Restrictions
Data are licensed to Princeton University-affiliated persons only. 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.
Status
Complete
Maintenance and Update Frequency
Monthly
Point of Contact
Contact Organization
Map and Geospatial Information Center, Lewis Library, Princeton University
Delivery Point
Map and Geospatial Information Center, Lewis Library, Princeton University
City
Princeton
State
NJ
Postal Code
08544
Country
US
Contact Telephone
609-258-1097
Point of Contact
Contact Organization
Enhanced 9-1-1 Board
Delivery Point
94 State Street - Drawer 20
City
Montpelier
State
VT
Postal Code
05620-6501
Country
US
Contact Telephone
800-342-4911
Contact Facsimile Telephone
800-342-4911
Contact Electronic Mail Address
info@vcgi.org
Hours of Service
9am - 5pm, M-F
Credit
National ParcelMap Data Portal/E911
Native Data Set Environment
Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.2.0.3348
Data Quality Information
Attribute Accuracy Report
Proof plots were generated by the original contractor and checked by the contractor. VCGI (then OGIS) staff verified the accuracy and attribute errors of all arcs. Corrections made by the contractor were spot checked by VCGI staff. Additional corrections were made directly by VCGI staff. All line work was checked by VCGI staff with translucent paper proof plots anchored to the source photos with 1000 meter tics. Attributes were checked against VTrans highway maps. Frequency files were generated from the final data to reveal unlikely and impossible attribute combinations (e.g., a gravel US highway). Subsequent to the original digitizing, VCGI has made many minor corrections to road numbers, classes and other attributes, discovered while implementing new attributes and working with the data. See the VGIS Standard on 'Updating the Road Centerline Data Layer' (see VGIS Handbook) for details on quality control measures used for regional data updates. CHANGES MADE BY E911 CONTRACTOR; E911 updates performed via the Enhanced 9-1-1 Addressing project (1996-1997) were verified for consistency per the VGIS Standard on 'Updating the Road Centerline Data Layer'. The consistency of geo-coding (addressing) was also checked. Updates performed after October 1997 have not been QA/QCed by VCGI.
Quantitative Attribute Accuracy Assessment
Logical Consistency Report
OVERVIEW; The EmergencyE911_RDS coverage was derived from Vermont's "master" Road Centerline Data Layer (RDSnn). E911's primary contractor updated RDSnn, modified its attribute structure (added and dropped attributes), removed unwanted pseudo nodes, and created the resulting EmergencyE911_RDS coverage. The EmergencyE911_RDS coverage is designed for use within E911's emergency response system. It is maintained independently from the RDSnn data layer. ORIGINAL DATA; The original RDSnn data layer included all roads appearing on the official VT Agency of Transportation (VTrans) highway maps, with most road locations determined from RF 5000 orthophotos (or better). When road locations were not clear from the orthophotos, an accuracy code (RDSACC) was used to record uncertainty in the location. In cases where roads were built after the orthophotos were flown, locations were generally approximated based on VTrans maps. The accuracy of some road locations were improved in the EmergencyE911_RDS through the use of GPS technology (Enhanced 9-1-1 Addressing Project; microDATA 1996-1998). The original digitizing of the road centerline data was done by Greenhorne O'Mara Inc., Deluth GA, 1991-92 using Arc/Info (VAX). Many subsequent updates have been made by Regional Planning Commissions, their contractors and VCGI using various digitizing techniques. MAINTENANCE; The original RDSnn data was historically maintained by VCGI (about 30 MB and 65,000 arcs statewide), with updates being performed by Regional Planning Commissions, their contractors, and VCGI. The intention is that the RDSnn data be maintained in a 'master', comprehensive layer from which other roads layers may be derived. VTrans will take on management responsibility for the layer in 1999. The EmergencyE911_RDS data layer has been "split off" from RDSnn and has become and independent coverage maintained by Vermont's Enhanced 911 Board. VTrans attributes in the EmergencyE911_RDS coverage (such as RTNO and CLASS) may not reflect "official" VTrans information. Users requiring the latest RTNO, CLASS, and other VTrans attributes should utilize RDSnn. Users who want road name and address range information should use EmergencyE911_RDS. Again, these two data layers are being maintained independently and therefore may not align spatially, even though they generally will in many cases (since they are based on the same original data set). The EmergencyE911_RDS data should not be clipped to a town boundary, since some attributes near the boundary will likely be improperly clipped. Instead, the MCODE or FIPS6 (added by VCGI) town code attribute can be used to extract arcs by town. Refer to E911\TBPOLY for a lookup table matching FIPS6 to MCODE and TOWNAME. E911 CONTRACTOR UPDATES; Updates to the data via the Enhanced 9-1-1 project have affected "private" roads. According to E-911 standards, a road coded as "private" in the RDS data will be considered a "private road" if it leads to 3 or more buildings (emergency sites - EmergencyE911_ESITE). However, if a road coded as "private" leads to two buildings or less, its considered a "driveway" and therefore has been moved to the EmergencyE911_DW (driveways) coverage. Driveways were not added to the EmergencyE911_RDS coverage because it would have split existing ARCs in too many places.
Completeness Report
Line accuracy standards for the original data conversion were set as being within the confines of the visible road surface. All roads were checked for both line and attribute accuracy by VCGI. The line work was checked with translucent proof plots anchored to the source photos with 1000 meter tics. Most road centerlines are expected to fall within about 6 meters of their true ground locations (except in cases where the wrong road was digitized/attributed, where orthophotos do not meet national map accuracy standards, where road locations were not clearly visible on the photos, or roads that have been built since the orthophotos were taken). As noted by Chittenden County "It is estimated that centerlines fall within the tax right-of-way 99% of the time." Road arcs were edgematched at the orthophoto boundaries with a complex algorithm, based on the distance between arc endpoints in adjoining photos, 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 road sections (generally less than 1 cm equals 50 meters on the ground) were added when needed at the corners of the photos without reference to the source maps, but only in cases where the road location was obvious. CHANGES MADE BY E911 CONTRACTOR; The Enhanced 911 program's primary contractor collected new road locations and corrected inaccuracies in the old centerlines using GPS receivers in the field. These centerlines are generally expected to be within 5 meters of its true location, but variations in GPS data collection quality can create variable results. Last Update Was: 9/15/08
Horizontal Positional Accuracy Report
Line accuracy standards for the original data conversion were set as being within the confines of the visible road surface. All roads were checked for both line and attribute accuracy by VCGI. The line work was checked with translucent proof plots anchored to the source photos with 1000 meter tics. Most road centerlines are expected to fall within about 6 meters of their true ground locations (except in cases where the wrong road was digitized/attributed, where orthophotos do not meet national map accuracy standards, where road locations were not clearly visible on the photos, or roads that have been built since the orthophotos were taken). As noted by Chittenden County "It is estimated that centerlines fall within the tax right-of-way 99% of the time." Road arcs were edgematched at the orthophoto boundaries with a complex algorithm, based on the distance between arc endpoints in adjoining photos, 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 road sections (generally less than 1 cm equals 50 meters on the ground) were added when needed at the corners of the photos without reference to the source maps, but only in cases where the road location was obvious. CHANGES MADE BY E911 CONTRACTOR; The Enhanced 911 program's primary contractor collected new road locations and corrected inaccuracies in the old centerlines using GPS receivers in the field. These centerlines are generally expected to be within 5 meters of its true location, but variations in GPS data collection quality can create variable results.
Lineage
Source
Originator
E911 Board
Publication Date
20121101
Publication Time
unknown
Title
EmergencyE911_RDS
Geospatial Data Presentation Form
vector digital data
Publication Information
Publication Place
Montpelier, VT
Publisher
E911 Board
Source Scale Denominator
0
Type of Source Media
hardcopyPhoto
Source Temporal Extent
Time Period Information
Single Date/Time
Calendar Date
20121101
Time of Day
unknown
Source Currentness Reference
Publication Date
Contribution
E911 Board
Spatial Data Organization Information
Direct Spatial Reference Method
Vector
Point and Vector Object Information
SDTS Terms Description
SDTS Point and Vector Object Type
String
Point and Vector Object Count
6427
Spatial Reference Information
Horizontal Coordinate System Definition
Planar
Map Projection
Map Projection Name
NAD 1983 StatePlane Vermont FIPS 4400
Transverse Mercator
Scale Factor at Central Meridian
0.9999642857142858
Longitude of Central Meridian
-72.5
Latitude of Projection Origin
42.5
False Easting
500000.0
False Northing
0.0
Planar Coordinate Information
Planar Coordinate Encoding Method
coordinate pair
Coordinate Representation
Abscissa Resolution
0.0000000022208457295391785
Ordinate Resolution
0.0000000022208457295391785
Planar Distance Units
meter
Geodetic Model
Horizontal Datum Name
D North American 1983
Ellipsoid Name
GRS 1980
Semi-major Axis
6378137.0
Denominator of Flattening Ratio
298.257222101
Entity and Attribute Information
Entity Type
Entity Type Label
roads_50025_2014
Entity Type Definition
Polylines representing roads.
Entity Type Definition Source
VCGI
Attributes
FID
Internal feature number. (Sequential unique whole numbers that are automatically generated.)
Definition Source
ESRI
Shape
Feature geometry. (Coordinates defining the features.)
Definition Source
ESRI
SEGMENTID
Alternate feature ID.
Definition Source
VCGI
PD
Directional prefix.
Definition Source
VCGI
SN
Street name.
Definition Source
VCGI
ST
Type suffix.
Definition Source
VCGI
SD
Directional suffix.
Definition Source
VCGI
GEONAMEID
Geographic name ID.
Definition Source
VCGI
PRIMARYNAM
Primary street name.
Definition Source
VCGI
ALINAME
Street alias.
Definition Source
VCGI
ALIAS1
Street alias.
Definition Source
VCGI
ALIAS2
Street alias.
Definition Source
VCGI
ALIAS5
Street alias.
Definition Source
VCGI
COMMENTS
Comments.
Definition Source
VCGI
SURFACETYP
Surface type.
Definition Source
VCGI
ONEWAY
Indicates whether feature is a one-way road.
Definition Source
VCGI
LTWN
Town on left side of road.
Definition Source
VCGI
RTWN
Town on right side of road.
Definition Source
VCGI
LLO_A
Definition Source
VCGI
RLO_A
Definition Source
VCGI
LHI_A
Definition Source
VCGI
RHI_A
Definition Source
VCGI
LZIP
ZIP code on left side of road.
Definition Source
VCGI
RZIP
ZIP code on right side of road.
Definition Source
VCGI
LLO_T
Definition Source
VCGI
RLO_T
Definition Source
VCGI
LHI_T
Definition Source
VCGI
RHI_T
Definition Source
VCGI
RTNUMBER
Route number.
Definition Source
VCGI
AOTCLASS
Agency of Transportation class.
Definition Source
VCGI
UPDATEDATE
Date of update.
Definition Source
VCGI
Shape_len
Length of feature.
Definition Source
VCGI
Distribution Information
Format Name
SHP
Distributor
VT Center for Geographic Information
Name
Metadata Reference Information
Metadata Date
20160810
Metadata Contact
Contact Information
Contact Organization Primary
Contact Organization
Map and Geospatial Information Center, Lewis Library, Princeton University
Contact Address
Address
Map and Geospatial Information Center, Lewis Library, Princeton University
City
Princeton
State or Province
NJ
Postal Code
08544
Country
US
Contact Voice Telephone
609-258-1097
Metadata Standard Name
FGDC Content Standard for Digital Geospatial Metadata
Metadata Standard Version
FGDC-STD-001-1998
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