July 6, 2017
How Did The 2017 Spring Collection Go?
The 2017 spring orthophoto acquisition season was challenging. The specifications for Vermont’s orthos require: 1) no snow, 2) no leaves, and 3) no clouds. As you can imagine, this is very difficult to achieve in Vermont. This year was especially difficult. The acquisition area received widespread heavy snow in late March, resulting in persistent snowpack until the middle of April. Flightlines in the Champlain Valley were opened on April 13th, with additional lines opened on the 17th. Unfortunately weather conditions precluded acquisition. All remaining lines were opened on April 20th. The first successful flights were on April 23rd, which captured approximately 50% of the acquisition area at 30cm. The acquisition contractor made a final push on April 27th and 28th to capture additional lines (both 15cm and 30cm) with limited success. All flight lines were closed by VCGI on May 1st due to leaf-out conditions, which was one of the earliest closures in recent memory. The acquisition contractor is processing the imagery and will have preliminary data ready for review by June.
So What Was Collected In 2017?
The blue areas were collected at 30cm GSD. The green areas were collected at 15cm GSD. A large portion of Addison County and the eastern third of the 2017 acquisition area was not acquired in 2017 (shown in yellow). Most 15cm buy-up areas were not collected in 2017. Click here for a PDF map of 2017 orthophoto acquisition.
When Will These Areas Be Collected?
VCGI is currently working with our contractor to draft a plan for future acquisition of the areas not collected in 2017. We will let everyone know what the plan is when it is completed.
June 23, 2017
VCGI is pleased to announce the rollout of more lidar image services covering all or parts of Addison, Bennington, Chittenden, Franklin, Grand Isle, Lamoille, Orleans, Rutland, Washington, Rutland and parts of Caledonia and Orange Counties. The remaining area should have services by the end of 2017. The links below will take you directly to the Rest Endpoint Page for each service. If you are not sure what to do with a Rest Endpoint Page, check out our help video on the topic:
- VCGI is aware that both slope services descriptions erroneously refer to the service units as “degree slope”, when in fact they are “percent slope”. Technical issues are blocking our efforts to correct the description. Thank you for your patience in the meantime.
- Both the ASPECT and SLOPE image services were intentionally published with the default gray scale color ramp to support flexibility for the user. For details on how you can generate derivatives on the fly using this service, please watch the March 2017 webinar on how to use the new lidar imagery services, The Powerpoint used is posted here
- The ASPECTSYM and SLOPESYM image services were published with pre-determined color ramps (that cannot be changed) to provide users with a “cartographic ready” option.
- ASPECT and SLOPE data used in these services are not yet completely available for download (soon!)
April 14, 2017
2016 4-band Ortho Imagery Now Available for Rutland and Windsor Counties!
The new vintage of digital ortho imagery has a base resolution of .3 meters (previously we collected .5 meter) with higher-resolution .15 meter imagery collected in most downtown and village areas. Check this online map for details on higher resolution areas and also which part of the state will be collected each year. The imagery collected in 2016 for the Rutland/Windsor area is now available for download in .jp2 format as well as via image service. Links to download and rest end point are found at the VT Open Geodata Portal. You can also choose to purchase the All Imagery data product (on external drive) if you would like the uncompressed .tif images.
New Lidar Data for Windham, Chittenden, Washington, Lamoille, and Orleans Counties Available!
Not only is newly collected lidar data for a big portion of the state available for download at the Open Geodata Portal (DEM, DSM, and contours), VCGI’s new lidar DEM and hillshade image services are available for the whole state (minus the eastern central portion of the state along the CT River which was collected in the fall of 2016 and should be available late in 2017). All new available lidar (including point clouds, which are not available for download) and their derivatives, as they become available, can be purchased on a single All Lidar external drive as well.
Updated E911 Data Has Been Posted!
E911 data, including esites, driveways, emergency service zones, and other related layers have been updated and posted for download at the VT Open Geodata Portal. More information about what has been posted can be found at the VCGI web site.
January 4, 2017
The VT Center for Geographic Information (VCGI) is pleased to announce the release of a new Vermont Open Geodata Portal (geodata.vermont.gov). VCGI, in close collaboration with Vermont’s Enterprise Geospatial Consortium (EGC), has built a website (Portal) that helps constituents find, explore, and access a wealth of geospatial resources. The Portal provides access to geodata, web services, and applications originating from many sources (publishers) including numerous State agencies (e.g. VT Agency of Natural Resources, VT Agency of Transportation, VT Agency of Human Services, VT E911).
- Download formats – Vector datasets are available in multiple download formats (shapefile, excel, and csv).
- Smart search – All entries are fully indexed with tags and keywords making it easier to find what you’re looking for.
- Data visualization – Vector datasets can be visualized using the built-in map viewer. Users can even filter the data before they download it!
- Big Data download tools – The Portal includes special tools for “big” datasets such as imagery and lidar. These include the Tiled Data Download Tool and Clip & Zip Tool.
- Modern web platform – The Portal leverages modern web technology supported by Esri (Environmental System Research Institute, Inc.), providing the State with an upgrade path for the future.
VCGI would like to thank our State Agency partners for their ongoing dedication to improving access to Vermont’s geospatial resources!
December 19, 2016
Parcel Data Posted: 39 towns (6 newcomers!) – details here: http://vcgi.vermont.gov/parcels/update_2016A
New Open Geodata Portal Beta Posted: Different CMS, totally different look, still time to provide your feedback via the survey!
Link to BETA 3.0: http://geodata1.vcgi.opendata.arcgis.com/
What do you think? Check out the site then please filling out this short survey https://www.surveymonkey.com/r/TW92TC6 . The BETA 3.0 site will be available until 5PM 12/21/2016 (Wednesday) so don’t delay!
2017 Intro GIS Training Dates Set: Check the VCGI Trainings Web Page for more details about the trainings that will be offered in partnership with VT Technical College:
November 3, 2016
The VT Center for Geographic Information (VCGI) is pleased to release a BETA version of Vermont’s new Open Geodata Portal!
VCGI and its partners have built a website that connects publishers and consumers and helps them find, explore, contribute, and use geospatial information and resources. The VT Open Geodata Portal (Beta) “federates” geodata, web services, and geospatial applications from many sources (publishers) including several State agencies (e.g. VT Agency of Natural Resources, VT Agency of Transportation, and VT Agency of Human Services). VCGI would like to thank our partners for their dedication to improving access to Vermont’s geospatial assets.
What do you think? Please take a few minutes to explore the BETA site (http://geodata.vermont.gov), kick the tires, and let us know what you think (http://geodata.vermont.gov/beta_survey). Your input will help us improve the website. We plan to release a final version by the end of the year. Thanks!
P.S. Known “bugs/limitations” have been documented here (http://geodata.vermont.gov/beta1_bugs).
July 18, 2016
New LiDAR Data Available:
1. 2013 Rutland/Grand Isle data “collection” which includes the Mad River Valley (see map here): 0.7m resolution, Quality Level 2 (QL2). – DEM has been posted, Hillshade and Contours are coming soon.
2. A pre-release portion of the 0.7m Quality Level 2 (QL2) 2014 “Eastern VT” data “collection” which includes a portion of Georgia and stretches south along the lake into Charlotte in Chittenden County (see map here). – DEM and Hillshade have been posted, Contours are coming soon.
Visit VCGI’s Open Data page and search via keyword “lidar” to see the list of new and updated data: http://vcgi.vermont.gov/opendata
Changes to Existing Data:
NOTE: some of the data identified below did NOT make it through the posting process. We are working through some technical issues and hope to resolve them in the next couple of weeks.
1. Updated naming convention to all LiDAR related data. E.g., “Elevation_DEM1m1020_2005.img” is now “Elevation_DEM1M2005_1020.img”.
a. Digital Elevation Model (DEM) data now reflects its “hydro treatment”, e.g., DEM = “pure” DEM; DEMHF = “Hydro-flattened” DEM; DEMHE = “Hydro-enforced” DEM; see USGS’s “Hydro Treatments of LiDAR Derived DEMs” powerpoint for details.
2. All downloadable data layers are in their original, vendor-delivered tiling structure, re-projected to VT State Plane Coordinate System NAD83 meters, Zunits meters and the Erdas Imagine format. This primarily affected the following collections:
a. 2008 “Lower” Missisquoi – Reimported to original 1.6m, “hydro-flattened” DEM format;
b. 2010 “Upper” Missisquoi (a.k.a. “Rock River”) – Reimported to original 1.6m, “hydro-flattened” DEM format;
c. 2012 Bennington County – Reimported to original 2m, “pure” DEM format;
3. Only DEMs and contours (DEM/DEMHE/DEMHF) are provided in tiled format. Other derivatives are in single mosaic file format only.
a. When contour data was part of the original vendor delivery they are in the same tile index structure as the DEMs.
b. When contour data was not part of the original vendor delivery and created by VCGI in 2013/2014 they are in the “Ortho9” tile index.
4. All primary (DEMs) and secondary derivatives (ASPECT, DSM, HILSHD, nDSM & SLOPE) are available in a single, mosaic file format covering the full “collection” extent.
Changes to Metadata:
- All LiDAR metadata files have been updated to latest EGC format (May 2016).
- For original vendor metadata see “All VT LiDAR on an External drive” main page for all project level metadata in a central location (these are original vendor metadata for LAS data).