September 28, 2017

VCGI is excited to be providing this year's @HackVT datasets! Register your team today! HackVT is a 24 hour event taking place October 13/14. More info here:

Events coming up over the next few weeks related to HackVT:


Code for  BTV - Lasers in the Sky / GeoBeers!

Friday, September 29, 2017 6:00 PM to 8:30 PM at SEABA in Burlington

Code for BTV - Autumn Plan-a-thon

Saturday, September 30, 2017 9:30 AM to 4:30 PM at SEABA in Burlington

Vermont Coders Connection - Mapping the HackVT Datasets

Wednesday, October 4, 2017 6:00 PM at Main Street Landing Performing Arts Center 60 Lake Street, Burlington
John Need will be presenting some of the javascript maps he has been working on, you can see the code and run it here:


Burlington Data Scientists - Applications of Geospatial Data in Data Science

Wednesday, October 4, 2017 7:30 PM at Main Street Landing Performing Arts Center 60 Lake Street, Burlington (directly following the talk above)

September 21, 2017

Who: Code for BTV & Vermont Center for Geographic Information
What: Free Geographic Tech Talk for Burlington's General Public
When: Friday, September 29, 6pm (5 PM at ArtsRiot for Geobeers, followed by...Tech Talk at BHW)
Where: At Big Heavy World, inside the SEABA Center at 404 Pine Street, Burlington (Map: )

This event is an opportunity to get together with Geogeeks AND the public to share how cool geospatial technology really is. Meetup at ArtsRiot next door at 5 PM and then we will head over to the GeoTech Talk at Big Heavy World (how appropriate!). Bring your friends who don't understand what you do!

Drones, helicopters, and planes are shooting lasers at the earth. Why? Satellites are staring down at us from space all day, and all night. What do they see, and how is it being used? Friends and neighbors are working for the city using their phones and tablets with GPS devices to collect all sorts of details about the city around you. What does the city use it for? Does it affect your taxes or how long a fire truck takes to reach your house? Are your photo posts on Yelp, Facebook, Twitter, or Instagram helping your community, or just changing the ads you see in your web browsing? If we take the lasers, the satellites, and the phone GPS data, and mash it together onto a map, what things can we see and do?

Are you just plain curious about place-based information (i.e., geo-spatial data)?

Please join Code for BTV, and the Vermont Center for Geographic Information, at 6pm on September 29th, for this free public discussion on what geographic data systems are, how they are used around you every day, and why it might matter to you. The event is being held at Code for BTV’s home base, Big Heavy World inside the SEABA Center at 404 Pine Street in Burlington. RSVP for the event at The venue is handicapped accessible. 

This will be both a presentation, and a free form discussion on the topic of geographic data and the systems involved in collecting, managing, and using it. It’s all geared toward the general public that knows absolutely nothing about geographic data. The presentations will teach from a high level general perspective how these systems work, and then show you the myriad of ways that they are used to help you, record you, influence you, and provide you with world understanding that would be otherwise unattainable. The presentations will be fun, lightweight, and visually exciting.

About Code for BTV: Code for BTV is an official Code for America Brigade that facilitates sustainable collaborations on civic software and open data projects between coders, designers, and organizations (both governmental and non-governmental) in the greater Burlington, Vermont area. Code for BTV hosts events for civic hackers to come together and work on building and reusing civic apps and support open data initiatives. Code for BTV is supported in part by The Office of the Vice President for Research at UVM and administrated by Big Heavy World.

About VCGI: The Vermont Center for Geographic Information, a division of the Agency of Commerce and Community Development (VCGI), provides strategic governance and delivers high quality geospatial data, services, solutions, infrastructure and expertise that helps enable legislation.


Nick Floersch (pr. Floor-sh), Code for BTV Co-Captain

802 778 0910,



August 30, 2017
The VT Center for Geographic Information (VCGI) has identified a problem with the compressed versions of Vermont’s 2016 orthoimagery.  This posting describes the problem as well as procedures for fixing the problem depending on how the user acquired the imagery.
Description of Problem
The 2016 orthoimagery was delivered in two raster formats; 1) TIFF and 2) JPEG2000 (*.jp2).  These files were accompanied by associated “auxiliary files”, which are files with an *.aux and *.aux.xml extension.  These files are often generated by Esri software and contain “configuration” information which can affect how Esri and other software interact with raster files.
VCGI has determined that the aux files accompanying the JPEG2000 files included invalid configuration information which causes raster cell values equal to zero (0) to be interpreted as “nodata” by Esri software (as well as some other GIS packages such as QGIS).  Visually this manifests itself as “speckle” in the imagery, however, it can also make its way into derivative raster data since geoprocessing routines will interpret zeros as nodata.
The problem can be easily resolved by removing the *.aux and *.aux.xml files accompanying the JPEG2000 files.  VCGI has already removed these files from the systems we manage (e.g. VT Open Geodata Portal).  Please refer to the procedures outlined below to remove any offending 2016 orthoimagery “aux” files from your system.
  • VT Open Geodata Portal (Portal):  Use this procedure if you downloaded the imagery via the Portal.  NOTE: By default, the Portal’s “Tiled Data Download Tool” will only give users the *.jp2 file, meaning you won’t have any *.aux or *.aux.xml files to worry about.  However, if you bypassed this interactive selection tool and “bulk downloaded” directly from the web folder then you’ll need to follow these procedures (assumes Windows OS).
  1. Browse to the folder where you downloaded the files.
  2. Sort on the “type” column.
  3. Carefully Select and Delete all *.aux and *.jp2.aux.xml
  4. Repeat for all 2016 orthoimagery datasets (e.g. 30cm, 15cm, black & white, color).
  • Offline Data Product:  If you ordered an offline product containing the 2016 imagery
  1. Browse to .\VIL\IMAGERY\VTORTHO\0_3M\CLRIR\2016\COMP
  2. Sort on the “type” column.
  3. Carefully Select and Delete all *.aux and *.jp2.aux.xml
  4. Repeat for these folders
Question? Contact Steve Sharp, VT Ortho Program Manager at


July 26, 2017
Information About the Summer 2017 Parcel Data Update

The following towns are new additions to the VT Open Geodata Portal:

Danville 2016 (NVDA)
Glover 2016 (NVDA)
New Haven 2015 (ACRPC)
Sheldon 2014 (NRPC)
Stannard 2015 (NVDA)
Starksboro 2013 (ACRPC)

The following towns were updated:

Bolton 2016 (CCRPC)
Brattleboro 2016 (WRC)
Bristol 1993 (ACRPC)
Calais 2014 (CVRPC)
Charlotte 2016 (CCRPC)
Chester 2016 (SWCRC)
Colchester 2016 (CCRPC)
East Montpelier 2017 (CVRPC)
Eden 2016 (LCPC)
Enosburgh 2014 (NRPC)
Essex 2016 (CCRPC)
Ferrisburgh 2016 (ACRPC)
Guilford 2016 (WRC)
Hartland 2017 (TRORC)
Huntington 2015 (CCRPC)
Jericho 2016 (CCRPC)
Leicester 2009 (ACRPC)
Lincoln 2014 (ACRPC)
Ludlow 2016 (SWCRC)
Middlebury 2013 (ACRPC)
Milton 2016 (CCRPC)
Monkton 2014 (ACRPC)
Orwell 2013 (ACRPC)
Panton 2015 (ACRPC)
Reading 2016 (SWCRC)
Ripton 2012 (ACRPC)
Salisbury 2010 (ACRPC)
Shelburne 2016 (CCRPC)
South Burlington 2016 (CCRPC)
Stowe 2016 (LCPC)
Tunbridge 2016 (TRORC)
Underhill 2014 (CCRPC)
Waltham 2012 (ACRPC)
Weathersfield 2016 (SWCRC)
West Windsor 2016 (SWCRC)
Weybridge 2006 (ACRPC)
Whitingham 2015 (WRC)
Windsor 2016 (SWCRC)

July 24, 2017

VCGI periodically assesses its suite of Web Map Services to determine if modifications are needed.  We analyze usage statistics to identify "low-use" and "high-use" services, and then target adjustments accordingly.  These adjustments include a range of things such as configuration changes to improve service performance OR adjustments to low-use services to reduce their standing load on the server.  In some cases we may choose to retire services.

So what is changing? Based on our most recent assessment (7/21/2017) VCGI will be making the following changes to our suite of Web Map Services.  The services designated for "retirement" will be supported for the next 90 days (retired on 10/31/2017).  Services designated for "replacement" will also be supported for the next 90 days, but user should begin migrating their applications over to the replacement services as-soon-as-possible.  All services noted in this notice are available via this REST endpoint (

Some Low-Use Services to be Retired on 10/31/2017
  • EGC_services/GCS_E911_RDSNAME_SP
  • EGC_services/GCS_E911_RDSRANGE_SP
  • EGC_services/MAP_VCGI_ALLIMAGERY_SP_NOCACHE_v3 (are being replaced by new services noted below)
  • EGC_services/MAP_VCGI_ALLIMAGERY_WM_NOCACHE_v3 (are being replaced by new services noted below)
Some High-Use Services to be Replaced on 10/31/2017 (replacement services are already available for porting)
  • EGC_services/MAP_VCGI_ALLIMAGERY_SP_NOCACHE_v3 will be retired and replaced by the following (note: the original service layer IDs have been kept the same)
  • EGC_services/MAP_VCGI_ALLIMAGERY_WM_NOCACHE_v3 will be retired and replaced by the following (note: the original service layer IDs have been kept the same)
Life Cycle Policy

All of this and more can be found in VCGI's ArcGIS Server Life Cycle Policy.


Contact Steve Sharp