VT GIS Guidelines

EGC Geospatial Data Exchange Protocol

12 February 2020
The EGC Geospatial Data Exchange Protocol is a framework of data-exchange specifications that yield efficient and effective sharing and exchange of geospatial data resources between EGC-member organizations. The protocol brings clarity, consistency, and reliability to data exchange processes. It is based on adopted standards and best data-management practices.

ArcSDE Configuration and Management Guidelines

22 December 2006
This guideline is designed to help agencies in the State of Vermont who plan to configure and manage an ArcSDE1 installation. It includes a set of guidelines that will help ensure greater compatibility between Agencies in the State of Vermont. The hope is that this will lead to improved data sharing and exchange, and create the foundation for an Enterprise VGIS System.

Vermont GPS Guidelines

26 September 2005
This section can be used as a stand-alone reference to aid users of Global Positioning Technology (GPS) in gaining a better understanding of the technology and to improve the quality and accuracy of the data they acquire. It also provides the foundation for Section B - Data Accuracy Standards and Section C - Content Specifications that are geared to support project where GPS data is acquired through contractual agreements.

Horizontal Datum Conversions

26 February 1998
This paper outlines the steps required to convert ARC/INFO coverages from the North American Datum of 1927 (NAD27) to the more accurate North American Datum of 1983 (NAD83).

Managing Data Layer Updates

26 August 1993
Data maintenance is often an expensive yet neglected aspect of managing GIS data. Each data layer is unique and will have its own system for making and tracking updates. By consequence, tools for data maintenance are generally not built into GIS software. This guideline contains a collection of techniques and procedures for managing GIS data layer updates. Appropriate techniques can be adopted (with modification as need be) for a given data layer. Some data layers change very little over time, and may only require simple procedures for reporting errors and making rare revisions. Other layers change often and require procedures for recording updates in a manner that supports quality control and tracking of changes over time. A full range of techniques is discussed here, including methods which enable an audit trail of modifications over time for a given feature. The text is primarily intended for those familiar with the Arc/Info GIS software.

Contracting with GIS Consultants

26 June 2004
This guideline provides local communities with guidance in developing a project and project goals, preparing a request for proposals (RFP), and executing a contract for GIS mapping or analytical services. Included are technical and administrative specifications that are important to ensure the creation of a quality community product useful for many years to come.

GIS Data Directories and File Names

26 January 1991
This document is primarily for ARC/Info system managers and technicians. The directory and file naming conventions recommended here are used by VCGI. Communications with VGIS sites and user support will be simplified if these conventions are followed. Also, any applications, software or SMLs/AMLs developed by VCGI will use these conventions. Most importantly, if these conventions are followed, this document can serve as part of your system documentation for future users at your site.

Guidelines for the Use of the Vermont Coordinate System

26 November 1992
The objective is to provide a source document for any organization or political body wishing to regulate the use of the Vermont Coordinate System, and as such, the impact of these standards is dependent on the actions of those outside institutions. The reasons for utilizing the Vermont (state plane) Coordinate System are: 1. To describe on a common datum, the position of points on, above, or under the surface of the earth. 2. To perpetuate said positions in a convenient format. 3. To standardize the location of objects, points, and other entities, as recorded in geographic/ land information systems, (G/LIS) and other spatially related databases, for use in analytic and mapping applications. 4. To facilitate future survey retracement of land boundaries.

Vermont GIS Parcel Mapping Guideline

13 April 2017
This guideline will identify aspects of the parcel mapping process, issues to consider, and provide template documents that will assist listers, assessors, and other town officials with their duties as they relate to the development of parcel maps and data. An overview of the process is provided before the template documents. Please refer to the current VT GIS Parcel Data Standard at the VCGI web site (vcgi.vermont.gov) for technical specifications relevant to the creation or update of the parcel data used to create maps.
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Vermont Center for Geographic Information
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John E. Adams, Director
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VCGI is your source for the State of Vermont's geospatial data, information, and activities.