Blog

May 7, 2014

A day-long GIS and mapping conference in Colchester, VT with something for everyone! Check out the schedule and descriptions here:

http://vcgi.vermont.gov/events/06_11_2014_forum

May 6, 2014

VCGI is happy to announce the release of the following LiDAR-based, “secondary” derivatives, i.e., ASPECT, HILSHD, nDSM and SLOPE data. These data were derived from the Addison, Bennington and Essex Counties and the Missisquoi Subbasin projects.

 

Definitions:

ASPECT                                 - Cardinal direction of slope from 0 to 360 degrees (East = 90, South = 180, West = 270 etc.)

HILSHD (Hillshade)                - Models illumination of a surface from a light source at an azimuth of 315º and an altitude of 45º

nDSM                                     - “Normalized Digital Surface Model.”  DEM subtracted from the DSM - each pixel represents the height above ground, not above sea level.

SLOPE                                   - Change in elevation over the distance between the cell and its eight neighbors expressed in percent slope or percent grade, i.e., rise/run * 100.

To put this release into the context of the overall VT LiDAR Initiative and its data related goals, a very brief overview of our approach to date follows. Although only 3 of the 8 steps are mostly complete,  Phase I involved a high level of effort in establishing protocols, guidelines and technical approaches that extend to the second phase. As a result, Phase II will require less effort than did Phase I.  

 

PHASE I: (Includes 2012 Addison, 2012 Bennington and 2005 Essex Counties and the 2008/2010 Missisquoi Subbasin projects). These cover ~ 30% of the state.

1)      COMPLETE:                 Make “primary derivative” LiDAR data available on the VGIS, i.e., DEM and DSM, for the largest projects;

2)      COMPLETE:                 Make “secondary derivative” LiDAR data available on the VGIS, i.e., ASPECT, HILSHD, Ndsm and SLOPE for the largest projects;

3)      IN PROCESS (75%):    Integrate vendor provided 2’ contours, generate 2’ contours where needed to update the existing “ElevationContour_CN2T” data layer and make data available on the VGIS.

4)      PLANNED:                   Process Contour, DEM and DSM data into feature and image services, respectively and data available on the VGIS.

 

PHASE II: (Includes 2007 Bennington, Chittenden, Rutland & Washington flood plains, 2009 Barre-Montpelier, 2010 Bennington flood plains and 2012 VTrans-TSIrene projects). These cover ~6.8% of the state but not exclusive of larger projects, e.g., 2012 Bennington County vs. 2007 & 2010 Bennington floodplains.

1)      PLANNED:                           Make “primary derivative” LiDAR data available on the VGIS, i.e., DEM and DSM, for the largest projects;

2)      PLANNED:                           Make “secondary derivative” LiDAR data available on the VGIS, i.e., ASPECT, HILSHD, Ndsm and SLOPE for the largest projects;

3)      PLANNED:                           Integrate vendor provided 2’ contours, generate 2’ contours where needed to update the existing “ElevationContour_CN2T” data layer and make data available on the                                                              VGIS.

4)      PLANNED:                           Process Contour, DEM and DSM data into feature and image services, respectively and data available on the VGIS.

 

Please refer to vcgi.vermont.gov/lidar for information about the VT LiDAR Initiative, LiDAR related data and resources.

April 29, 2014

The VT Center for Geographic Information (VCGI) is pleased to announce an “open beta release” of the new VT Interactive Map Viewer.

You can participate in a guided tour during the free webinar on April 30.

This BETA 2.0 release includes numerous enhancements:

  • The toolbar has been rearranged to make it more intuitive.
  • The look-and-feel of the VT GIS basemap has been significantly improved.
  • Several dozen new data layers (including parcel data) have been added to the viewer.
  • Users can change the symbology of any layer.
  • There is a complete set of VT imagery and imagery indexes.
  • Several new supplemental background basemaps have been added such as contoured hillshade and the latest USGS Topographic Maps.
  • All layers have links to full documentation and downloadable data files.

Now we need to hear from you!  Please take the new VT Interactive Map Viewer (BETA 2.0) for a test drive, then let us know what you think by completing the Feedback Survey.

VT Viewer (BETA 2.0): http://dev.maps.vermont.gov/vcgi/vtmapviewerbeta2/

User Survey:  http://dev.maps.vermont.gov/vcgi/vtmapviewer/survey.html

The BETA 2.0 release will be available as an “open beta” until May 31st, 2014.  After that VCGI will be reviewing all survey feedback and applying any needed adjustments/fixes to the site.  We plan to release the final version by July 1st, 2014.  It will replace the current VT Interactive Map Viewer.

You can participate in a guided tour during the free webinar on April 30.

April 18, 2014

We are writing to you as a potential user of VCGI’s website, web map services, or web mapping applications.

You might be aware of a widespread software vulnerability named Heartbleed, which has affected a large number of servers on the internet.

We want to let you know that VCGI’s website (vcgi.vermont.gov), web map services (maps.vcgi.org), and mapping sites (maps.vermont.gov/vcgi/vtmapviewer) are not vulnerable to the Heartbleed bug. We have come to this conclusion by reaching out to our vendors to determine if any of their software products are vulnerable to the Heartbleed bug.

For more general information on Heartbleed, visit http://www.heartbleed.com/

April 11, 2014

More will be posted as they become available...

Through a grant provided by the Northern Border Regional Commission, VCGI is able to support 14 towns in their effort to create or update digital parcel data and maps for their towns. A number of those towns will be seeking companies to perform the parcel mapping and updates for them. The Requests for Proposal Documents they are putting out will be posted here:

http://vcgi.vermont.gov/about_us/projects/nvpdp

 

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