Enterprise GIS Consortium

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.

Attribute Definitions and Codes

26 January 1991
GIS attributes contain information associated with geographic features on a map. GIS users, present and future, will most likely need to develop attribute tables for new layers of map information. Existing attribute tables will need to be expanded as well. The Vermont Center for Geographic Information, Inc. (VCGI) encourages Vermont users of geographic information to use the same base attributes and codes so that data can be more easily exchanged and understood by all users.

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Vermont Center for Geographic Information
133 State Street
Montpelier, VT 05602
Email VCGI

Tim Terway, Helpful GIS Professional
(802) 585-0820

John E. Adams, Director
(802) 522-0172


VCGI is your source for the State of Vermont's geospatial data, information, and activities.