VCGI Web Services Expanded – Documentation Posted

February 27, 2013

VCGI, in collaboration with VT’s Enterprise GIS Consortium (EGC), has developed a portfolio of “web services” which allow users to bring map layers and imagery into their GIS projects or map mashups without actually downloading any data. By connecting to the service of choice via the internet (a live internet connection is required in order for the images to appear in your GIS project) users can access a variety of resources.

VCGI provides Web Map Services (including a basemap and contours), Imagery Services (black and white, color, infrared, various ages and resolution levels), and Geocoding Services. Services are often available in two forms: 1) cache and 2) non-cache. Cached services (*_CACHE) are designed to be used in browser or mobile web applications which utilize imagery at specific scales and need the fastest rendering performance. Non-cache services (*_NOCACHE) render the imagery to the client application dynamically; this allows clients such as ArcGIS Desktop to ask for the data in different ways (eg: different stretch or band combinations). Many of the services are also available in VT State Plane or Web Mercator projection/coordinate systems.

Services available and information on how to connect is available at the VCGI website:

Webinars Coming Up: Open Source, Emergency Mapping, VCGI’s New Website, QGIS, Census…

February 15, 2013

Plenty more webinars are scheduled for the next 6 weeks or so! See if any of the topics interest you and register today!


Click on the link below each webinar date for more details and link to registration.


The promise and the reality of free and open-source desktop GIS software

Tue, Feb 19, 2013 1:00 PM – 2:00 PM


QGIS: Creating Map Layouts – Printing and Exporting

Tue, Feb 26, 2013 1:00 PM – 2:00 PM


The New VCGI Website

Tue, Mar 5, 2013 1:00 PM – 2:00 PM


Mapping for Emergency Management (repeat)

Tue, Mar 12, 2013 2:00 PM – 3:00 PM


Mapping With Census Data: Linking Tabular Data From Factfinder2 With VCGI’s Shapefiles

Tue, Mar 19, 2013 1:00 PM – 2:00 PM



Feel free to contact me if you have questions about how a webinar works!

2012 VT Orthos Available for Download

February 15, 2013

2012 VT Orthophotos (compressed, .jp2 files) available in black and white or color infrared have been posted for download at the VCGI Data Warehouse:!

This is the second flight of the third vintage of digital VT orthos, and the area covered includes Addison County, Orange County, and part of Washington County. Check this Index map for the exact boundaries:

Specifications for this imagery include:

  • 50 cm pixels (same as previous state ortho imagery)
  • Black and White, Color, and Near Infrared will be available (previously only Black and White)
  • Collected after the snow melts and before the trees leaf out (same as previous imagery)
  • The horizontal accuracy of the orthorectified imagery shall meet or exceed a verified ASPRS Class I horizontal accuracy of +/- 1 meter RMSE (for both X and Y) for 50cm ground sample distance imagery and 2.44 meters at 95% confidence level according to the NSSDA standard methodology.

If you are interested in obtaining the uncompressed version of this imagery (geotiff) , it will be available for purchase as a stand-alone product until August 15, 2013. After that it will only be included in the Uncompressed VT 1:5k orthos (all vintages) product and the All Available Imagery product. Visit the products page for more info and to order.

Enhancing Vermont’s Software and Information Technology Economy

February 15, 2013

The VT Technology Alliance  passed along the link to the above-named report created by the VT Legislature, excerpted below. Link to full report is below the excerpt.

“III. Key Areas for Enhancing the Software and IT Economy; Findings and Recommendations
Based on the testimony and materials received, on individual members’ and small group research, and
on extensive Committee discussion, the Committee identified four key areas in which Vermont state
government can take important steps to enhance the software and IT economy. These areas are:

1. Education;
2. Marketing;
3. Finance; and
4. Collaboration and Networking.

Throughout its discussions, the Committee was cognizant of the state’s budget challenges, and
recognized that there is limited capacity for new or expanded appropriations or indirect tax expenditures
to support the Committee’s objectives. In recognition of this, the Committee endeavored to offer many
recommendations (e.g., policy changes) that would not require direct appropriations. In fact, only a few
of our recommendations require specific appropriations or tax expenditures, and we have clearly
highlighted those that do.

The Committee concluded that it would be unreasonable to expect the State of Vermont to compete with
larger states for incentives to relocate large-scale technology businesses to the state. Instead, the
Committee concluded that the State of Vermont should focus it efforts on the retention of existing
in-state technology businesses, with a new emphasis on strategies and policies to encourage and support
the growth and development of new and emerging technology businesses over the long term.”

Click here for the full report:

Draft Parcel Data Guideline Posted for Public Comment

February 13, 2013

Feedback Due by March 15, 2013

Last year, VCGI posted the VT Parcel Data Standard v. 1. This year, we are posting the draft Parcel Data Guideline which will provide information and templates to help municipalities and mapping contractors create robust municipal parcel data as part of the tax-mapping process. The draft will be posted for 30 days, during which time you can submit your feedback via the email link below. That feedback will be passed along to the VCGI Technical Advisory Committee, which will perform a final review of the Guideline and then vote to either accept the Guideline or not. If it is accepted, it will be posted here by April 1:

Please review the Guideline: Draft Parcel Data Guideline

And please click here to provide your feedback by March 15, 2013:

Thank you!

VCGI’s New Website and New Services Available Beginning Tonight (Feb. 1)

February 1, 2013

You will notice the following changes over the weekend (exact time will vary as changes propagate over the internet)…

Benefits to You

New Website (redirect should be automatic):

  • Improved appearance
  • Easier navigation
  • Streamlined data access
    • Direct access to pre-packaged data
    • Note: custom data/imagery download and tiled data download are no longer available – see technical explanation below

New/Updated Web Services:

  • Dynamic image services enable enhanced access to more VT imagery
  • Latest imagery is available via cache (including 2012 VT Orthos)
  • New geocoding services
  • Must have ArcGIS 10.x or higher to use new ArcGIS 10.1 web map services

Action You May Need to Take

  • If you currently use VCGI’s Basemap, Cached Imagery, or Geocoding Services, the domain remains but you will need to redirect ArcGIS as indicated in the tables at the new VCGI Website!:

More Great Things To Come

  • Webinars to help you navigate the changes (Tour of the new website, How to connect to map and imagery services…)
  • Data warehouse redesign.  We will spend time in 2013 thinking about and re-designing how we store the data we archive as well as how it is made discoverable by and available to you.
  • More cached imagery
  • New USGS topo maps
  • Enhancements to the new Interactive Map Viewer that may impact functionality and data available in the application.

Major Changes at VCGI: The Technical Explanation

New/Updated Web Services

  • ArcIMS has been replaced – This is why custom download and tiled-data download options are no longer available.
  • ArcGIS Server has been upgrade from 9.3.1 to 10.1  – this is why you need ArcGIS 10.1 or higher to use updated web services
  • Dynamic image services enable enhanced access to more VT imagery – more information about this new service will be available soon; keep an eye on the webinar schedule!
  • Latest imagery of all kinds is available via cache (including 2012)
  • Basemap and Imagery are also available as OGC web map services and web cache services

Server Upgrades

  • Complete server upgrade replaces current servers with virtual servers at the VT Dept. of Innovation and Information.
  • Redesigned website
    • same old data warehouse for now minus custom download and tile-download-tool (which may be re-added in the future)
    • prepackaged and pre-staged zip downloads