LISTSERV 16.0 - NEARC-L Archives

Good News Everyone!

I am happy to announce that the CT GIS Office has selected Dewberry Engineers, Inc. as the vendor that will be acquiring aerial imagery and LiDAR for the entire state as well as producing some requested derived data products.

Here is a summary of the deliverables agreed to by both OPM and Dewberry:

Aerial 4-band digital orthoimagery.

3-inch resolution.
Leaf-off capture in the spring of 2023 and 2026 respectively.
True orthoimagery (nadir) over urban centers and tall bridges/overpasses.

Elevation data captured using LiDAR (QL1)

15 points per square meter (ppsm) for the inland portions of the state and 20 ppsm in the coastal region as identified by OPM in consultation with the selection committee and GIS Advisory Council Imagery Acquisition Working Group.

Point cloud will be classified to include the following classifications:

Table 7: LIDAR CLASSIFICATION SCHEMA
CLASS NUMBER (#)	DESCRIPTION
Class 1	Processed, but unclassified
Class 2	Bare-Earth Ground
Class 3	Low Vegetation
Class 4	Medium Vegetation
Class 5	High Vegetation
Class 6	Buildings
Class 7	Low Noise
Class 9	Water (points located within collected hydro breaklines)
Class 17	Bridge Deck
Class 18	High Noise
Class 20	Ignored Ground (typically breakline proximity)
Class 21	Snow (if present and identifiable)
Class 22	Temporal exclusion (typically non-favored data in intertidal zones)

Bare Earth Digital Elevation Model at 0.5-meter resolution or better (hydro-flattened).

LiDAR-Derived 1-Foot Contours.
LiDAR-Derived Building Footprints for all structures larger than 100 ft²
3D Terrain Model with 3D Buildings (Level of Detail 2).

If you or your organization are interested in acquiring any buy-ups from Dewberry, please reach out to their point of contact for this project: Srinu Ratnala ([log in to unmask]) to discuss. If you or your organization elect to purchase something, please keep the CT GIS Office in the loop in case we can be of assistance in any way.

The Dewberry team is currently ready to mobilize and is only waiting for the weather to clear up so the planes can get in the air. Additionally, I plan to provide periodic updates on this project as it progresses and significant milestones are achieved.

I look forward to the many wonderful things the CT GIS community will create from this high-quality dataset, and as always, please feel free to reach out to me if you have any questions or comments.

Thanks,

Alfredo Herrera

Geographic Information Officer

Office of Policy and Management

State of Connecticut

450 Capitol Avenue

Hartford, CT 06106

Email: [log in to unmask]

Phone: 860-944-9713