NECCOG

Metadata Updated: November 29, 2025

Contours are lines of equal elevation. This is a contour feature layer for the state of Connecticut derived from the index contour in the 1' contour data set. All closed polygons less than 35' length have been deleted to improve loading performance. This data set is derived from the 2023 Lidar with15 to 20 points per meter squared.

Source:
1 foot contours were generated for each production block from the final bare earth DEMs using ArcGIS software. Contours are labeled as intermediate or index with index contours set to every 10th interval. Using ArcGIS software, the contours were validated for correct topology, including must not intersect, must not self intersect, and must not have dangles. Contours are then manually reviewed with the 3D breaklines to ensure complete coverage, correct coding, data integrity and that contours behave correctly around water bodies, water crossings, and elevated features such as overpasses. The contours are then clipped to individual tiles as creating one dataset for the entire project renders the feature class un-usable. Enclosed contours completely within building footprints were removed from the final contour dataset.

Coordinate System:

The data was developed based on a horizontal datum/projection of NAD83 (2011), State Plane Connecticut, U.S. Survey Feet and vertical datum of NAVD88 (GEOID18)

Contours were cut by Town then merged into COGs

Geographic Extent

Coverage: State of Connecticut

Classifications

Sensitivity: Public
Usage: Public Use
Quality: High Quality
Known Quality Issues: None known, but subject to standard limitations of third-party commercial data

Access & Use Information

Public: This dataset is intended for public access and use. Non-Federal: This dataset is covered by different Terms of Use than Data.gov. License: Creative Commons CCZero

Downloads & Resources

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Dates

Metadata Created Date	November 29, 2025
Metadata Updated Date	November 29, 2025

Metadata Source

Data.json Data.json Metadata
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Harvested from Connecticut Data.json

Additional Metadata

Resource Type	Dataset
Metadata Created Date	November 29, 2025
Metadata Updated Date	November 29, 2025
Publisher	State of Connecticut
Maintainer	ctgisoffice
Identifier	https://www.arcgis.com/home/item.html?id=336412e3a9a340139eeb1ecd374ce2f9&sublayer=7
Data First Published	2025-10-27
Data Last Modified	2025-11-18
Category	geospatial
Public Access Level	public
Metadata Context	https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID	https://data.ct.gov/data.json
Schema Version	https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby	https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id	5f315f81-e43d-45bb-b57e-8e976e5ab995
Harvest Source Id	36c82f29-4f54-495e-a878-2c07320bf10c
Harvest Source Title	Connecticut Data.json
Homepage URL	https://geodata.ct.gov/datasets/ctmaps::neccog-1
License	https://creativecommons.org/publicdomain/zero/1.0
Metadata Type	geospatial
Old Spatial	-72.2384,41.5084,-71.7817,42.0282
Source Datajson Identifier	True
Source Hash	3c5294f41da911049a7558a2c51599302a308b90e153b600464e752febdb3b4f
Source Schema Version	1.1
Spatial	{"type": "Polygon", "coordinates": -72.2384, 41.5084, -72.2384, 42.0282, -71.7817, 42.0282, -71.7817, 41.5084, -72.2384, 41.5084}

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