This image service is available through CTECO, a partnership between UConn CLEAR and CT DEEP. This layer is a hydro-flattened bare earth digital elevation model (DEM) derived from the classified Lidar point cloud covering the state of Connecticut.NOTE Service ChangesAlthough currently displaying 2023 elevation, this service (called Elevation) previously displayed 2016 elevation and will be updated when new elevation is available. Visit the CT ECO Map and Image Services page for a complete list of available elevation services. Connect to this service when you always want the latest and greatest service. Connect to CT 2023 Elevation (DEM) service for 2023 elevation that will not change. 2023 Statewide Extent: ConnecticutDates: 2023 (March 27 - April 13), between snow melt and leaf outData Info: statewide Digital Elevation Model (DEM), which is a bare earth elevation raster with no functions applied Pixel Resolution: 2 foot DEM raster derived from QL1+ Lidar point cloud with a minimum of 15 points per square meter inland and 20 points per square meter along the coast. The bare earth elevation from the points were averaged to get the elevation value for each pixel in the DEM. Projection: CT State Plane NAD 83 (2011) Feet (EPSG 6434)Service Projection: WGS 1984 Web Mercator Auxiliary Sphere (EPSG 3857)More Information- All About the 2023 Data Collection (Imagery and Lidar)- All about Connecticut Lidar Elevation- Lidar Elevation on CT ECO Explained- Metadata xml format- Download DEM and pointsTips- The elevation service contains processing templates like hillshade, slope, and aspect, that can be applied to change the appearance of the layer. - Symbology is another useful and easy way to display the elevation differently. Credit and Funding

This image service is available through CTECO, a partnership between UConn CLEAR and CT DEEP. The Apsect service is created by applying the aspect function to the bare earth Elevation service. NOTE Service ChangesAlthough currently displaying 2023 elevation, this service previously displayed 2016 elevation and will be updated when new elevation is available. Visit the CT ECO Map and Image Services page for a complete list of available elevation services. Dataset InformationExtent: ConnecticutDates: 2023 (March 27 - April 13), between snow melt and leaf outData Info: Aspect function applied to the Elevation service which is a statewide DEM (Digital Elevation Model) of bare earth elevation. Pixel Resolution: 2 foot DEM raster derived from Lidar point cloud Projection: CT State Plane NAD 83 (2011) Feet (EPSG 6434)Service Projection: WGS 1984 Web Mercator Auxiliary Sphere (EPSG 3857)

More Information- All About the 2023 Data Collection (Imagery and Lidar)- All about Connecticut Lidar Elevation- Lidar Elevation on CT ECO Explained- More about Aspect on CT ECO- Metadata xml format- Download DEM and pointsCredit and Funding

This image service is available through CTECO, a partnership between UConn CLEAR and CT DEEP. This layer is a hydro-flattened bare earth digital elevation model (DEM) derived from the classified Lidar point cloud covering the state of Connecticut.This service (called Statewide2016) will persist even as other elevation dates become available. Connect to the Elevation service to always have the latest and greatest service without changing the connection. Visit the CT ECO Map and Image Services page for a complete list of available elevation services. 2016 Statewide Extent: ConnecticutDates: 2016 (March 11 - April 16), between snow melt and leaf outData Info: statewide Digital Elevation Model (DEM), which is a bare earth elevation raster with no functions applied Pixel Resolution: 2 foot DEM raster derived from QL2 Lidar point cloud with a minimum of 2 points per square meter. The bare earth elevation from the points were averaged to get the elevation value for each pixel in the DEM. Projection: CT State Plane NAD 83 (2011) Feet (EPSG 6434)Service Projection: WGS 1984 Web Mercator Auxiliary Sphere (EPSG 3857)More Information- All About the 2016 Data Collection (Imagery and Lidar)- All about Connecticut Lidar Elevation- Lidar Elevation on CT ECO Explained - Metadata- Download DEM and Points Tips- The elevation service contains processing templates like hillshade, slope, and aspect, that can be applied to change the appearance of the layer. - Symbology is another useful and easy way to display the elevation differently. Credit and Funding

This image service is available through CTECO, a partnership between UConn CLEAR and CT DEEP. The Hillshade service is created by applying the hillshade function to the bare earth Elevation service.

These data were created as part of the National Oceanic and Atmospheric Administration Office for Coastal Management's efforts to create an online mapping viewer called the Sea Level Rise and Coastal Flooding Impacts Viewer. It depicts potential sea level rise and its associated impacts on the nation's coastal areas. The purpose of the mapping viewer is to provide coastal managers and scientist...

Product: These lidar data are processed Classified LAS 1.4 files, formatted to 23,381 individual 2,500 ft x 2,500 ft tiles; used to create intensity images, 3D breaklines and hydro-flattened DEMs as necessary. Geographic Extent: CT Statewide covering approximately 5,241 square miles. Dataset Description: CT Statewide GIS Services Lidar project called for the Planning, Acquisition, proces...

This metadata record describes the hydro-flattened bare earth digital elevation model (DEM) derived from the classified LiDAR data for the 2016 Connecticut Lidar project covering approximately 5,240 square miles.

Original contact information: Contact Org: NOAA Office for Coastal Management Phone: 843-740-1202 Email: coastal.info@noaa.gov

The Download Tool is available through CT ECO, a partnership between UConn CLEAR and CT DEEP. The tool provides easy download access to aerial imagery and lidar elevation collected during multiple flights. The download tool is designed to help users locate tiles or files on the map and then provide clear links to download. The files are listed by geography and include town mosaics, tiles for recent flights, tiles for the 2012 flight (same grid but larger, combined areas), and contour blocks for the 2016 and 2023 flights. Tool InformationExtent: StatewideDate: The tools was published in January 2025 and provides access to data captured as early as 2012.Metadata: The Metadata button links to metadata files for all datasets available in the Download Tool. Files Types & Sizes: The File Types and Sizes button links to more information about the files accessible from the tool. More Information The datasets linked in the table of the tile grid, which are also available in the Download Tool, include2023 Acquisition - aerial imagery tiles and town mosaics, DEM elevation tiles, lidar point cloud by tile, contour blocks2019 Acquisition - aerial imagery tiles and town mosaics2016 Acquisition - aerial imagery tiles and town mosaics, DEM elevation tiles, lidar point cloud by tile, contour blocks2012 Acquisition - aerial imagery tiles and town mosaicsSee the CT Aerial Imagery page and CT Elevation pages on CT ECO for more information. The Tile Grid with download links service is also available on the CT Geodata Portal through CT ECO. Credit and FundingThe Download Tool was created as part of a project between the CT GIS Office and UConn CLEAR/CT ECO. Each data acquisition had different funders and partners. Please see the acquisition pages for that information.

This image service is available through CTECO, a partnership between UConn CLEAR and CT DEEP. This dataset covers 1772 square miles of eastern Connecticut. Raster functions can be applied using the link below.Dataset InformationExtent: Eastern Connecticut, 1772 sq milesDates: 2010 (November 3 - December 11), leaf offData Info: Digital Elevation Model (DEM), which is a bare earth elevation raster, with no functions applied. Functions can be applied to service include aspect, hillshade, shaded relief, and slope. Pixel Resolution: 1 meter DEM raster derived from Lidar point cloud Projection: UTM Zone 18N, NAD83 meters, NAVD88 metersService Projection: WGS 1984 Web Mercator Auxiliary Sphere (EPSG 3857)More Information- Raster Functions- More Information- MetadataCredit and FundingUSDA Natural Resource Conservation Service (NRCS). Dewberry and Earth Eye LLC collected the data.

This image service is available through CTECO, a partnership between UConn CLEAR and CT DEEP. The Shaded Relief service is created by applying the shaded relief function to the bare earth Elevation service. NOTE Service ChangesAlthough currently displaying 2023 elevation, this service previously displayed 2016 elevation and will be updated when new elevation is available. Visit the CT ECO Map and Image Services page for a complete list of available elevation services. Dataset InformationExtent: ConnecticutDates: 2023 (March 27 - April 13), between snow melt and leaf outData Format: Shaded Relief function applied to Elevation service which is a statewide DEM (Digital Elevation Model). Pixel Resolution: 2 foot DEM raster derived from Lidar point cloud Projection: CT State Plane NAD 83 (2011) Feet (EPSG 6434)Service Projection: WGS 1984 Web Mercator Auxiliary Sphere (EPSG 3857)

More Information- All About the 2023 Data Collection (Imagery and Lidar)- All about Connecticut Lidar Elevation- Lidar Elevation on CT ECO Explained- More about Shaded Relief on CT ECO- Metadata xml format- Download DEM and pointsCredit and Funding

This image service is available through CTECO, a partnership between UConn CLEAR and CT DEEP. This layer is a hydro-flattened bare earth digital elevation model (DEM) derived from the classified Lidar point cloud covering the state of Connecticut.

This image service is available through CTECO, a partnership between UConn CLEAR and CT DEEP. The Hillshade service is created by applying the hillshade function to the bare earth Elevation service. Dataset InformationExtent: ConnecticutDates: 2023 (March 27 - April 13), between snow melt and leaf outData Info: Hillshade function applied to the Elevation service which is a statewide DEM (Digital Elevation Model) with an azimuth of 135 degrees, or southeast.Pixel Resolution: 2 foot DEM raster derived from Lidar point cloud Projection: CT State Plane NAD 83 (2011) Feet (EPSG 6434)Service Projection: WGS 1984 Web Mercator Auxiliary Sphere (EPSG 3857)More Information- All About the 2023 Data Collection (Imagery and Lidar)- All about Connecticut Lidar Elevation- Lidar Elevation on CT ECO Explained- More about Hillshade on CT ECO- Metadata xml format- Download DEM and pointsCredit and Funding

This image service is available through CTECO, a partnership between UConn CLEAR and CT DEEP. This dataset covers 141 square miles of southeastern Connecticut. Raster functions can be applied using the link below.Dataset InformationExtent: Extreme southeastern Connecticut, 141 square milesDates: 2011Data Info: Digital Elevation Model (DEM), which is a bare earth elevation raster, with no functions applied. Functions can be applied to service include aspect, hillshade, shaded relief, and slope. Pixel Resolution: 2 meter DEM raster derived from Lidar point cloud Projection: UTM Zone 19, NAD83 meters, NAVD88 metersService Projection: WGS 1984 Web Mercator Auxiliary Sphere (EPSG 3857)More Information- Raster Functions- More Information- MetadataCredit and FundingThis dataset was collected as part of the New England Lidar program with credit to the United States Geological Survey (USGS) and State of Maine's GIS Office. Photo Science Inc. collected the data.

Product: These are Digital Elevation Model (DEM) data for CT Statewide GIS Services as part of the required deliverables for the CT Statewide GIS Services Lidar project. Class 2 (ground) lidar points in conjunction with the hydro breaklines were used to create a 2 foot hydro-flattened Raster DEM. Geographic Extent: CT Statewide covering approximately 5,241 square miles. Dataset Description:...

Link to the ScienceBase Item Summary page for the item described by this metadata record. Service Protocol: Link to the ScienceBase Item Summary page for the item described by this metadata record. Application Profile: Web Browser. Link Function: information

LIDAR data is remotely sensed high-resolution elevation data collected by an airborne collection platform. Using a combination of laser rangefinding, GPS positioning and inertial measurement technologies; LIDAR instruments are able to make highly detailed Digital Elevation Models (DEMs) of the earth's terrain, man-made structures and vegetation. This data was collected at submeter resolution to...

This image service is available through CTECO, a partnership between UConn CLEAR and CT DEEP. This dataset covers 658 square miles of northwestern Connecticut. Raster functions can be applied using the link below.Dataset InformationExtent: Northwestern Connecticut, 658 sq milesDates: 2011 (December 13-19), leaf offData Info: Digital Elevation Model (DEM), which is a bare earth elevation raster, with no functions applied. Functions can be applied to service include aspect, hillshade, shaded relief, and slope. Pixel Resolution: 1 meter DEM raster derived from Lidar point cloud Projection: UTM Zone 18N, NAD83 meters, NAVD88 metersService Projection: WGS 1984 Web Mercator Auxiliary Sphere (EPSG 3857)More Information- Raster Functions- More Information- MetadataCredit and FundingUSDA Natural Resource Conservation Service (NRCS). Dewberry and Earth Eye LLC collected the data.

This data release contains coastal wetland synthesis products for the state of Connecticut. Metrics for resiliency, including the unvegetated to vegetated ratio (UVVR), marsh elevation, tidal range, wave power, and exposure potential to environmental health stressors are calculated for smaller units delineated from a digital elevation model, providing the spatial variability of physical factors that influence wetland health. The U.S. Geological Survey has been expanding national assessment of coastal change hazards and forecast products to coastal wetlands with the intent of providing federal, state, and local managers with tools to estimate the vulnerability and ecosystem service potential of these wetlands. For this purpose, the response and resilience of coastal wetlands to physical factors need to be assessed in terms of the ensuing change to their vulnerability and ecosystem services. This project has been funded in part by the United States Environmental Protection Agency under assistance agreement DW-014-92531201-1 to N. Ganju.

Bathymetry for Long Island Sound was derived from fifty-five surveys containing 562,596 soundings. Twenty-four older, less accurate, overlapping surveys were entirely omitted, and the overlap from eight older, less accurate surveys was omitted before tinning the data. The average separation between soundings was 77 meters. The fifty-five surveys used dated from 1931 to 1990. Approximately 40 percent of the surveys were from 1931 to 1939. The total range of sounding data was 2.1 meters to - 113.4 meters at mean low water. Mean high water values between 0.6 and 2.3 meters were assigned to the shoreline. Eighty-eight points were found that were not consistent with the surrounding data. These were removed prior to tinning. DEM grid values outside the shoreline (on land) were assigned null values (-32676). Long Island Sound has fifty-one 7.5 minute DEMs and five one degree DEMs. The 1 degree DEMs were generated from the higher resolution 7.5 minute DEMs which covered the estuary. A Digital Elevation Model (DEM) contains a series of elevations ordered from south to north with the order of the columns from west to east. The DEM is formatted as one ASCII header record (A- record), followed by a series of profile records (B- records) each of which include a short B-record header followed by a series of ASCII integer elevations (typically in units of 1 centimeter) per each profile. The last physical record of the DEM is an accuracy record (C-record). The 7.5-minute DEM (30- by 30-m data spacing) is cast on the Universal Transverse Mercator (UTM) projection. It provides coverage in 7.5- by 7.5-minute blocks. Each product provides the same coverage as a standard USGS 7.5-minute quadrangle but the DEM contains over edge data. Coverage is available for many estuaries of the contiguous United States but is not complete.

This data set represents smoothed, 2-foot bare earth contours (isolines) for the Fall River-Connecticut River (0108020105) HUC 10 unit. It was derived from a data set which was compiled from LIDAR collections in NH available as of spring, 2019. The raster was filtered using the ArcGIS FOCAL STATISTICS tool with a 3x3 circular neighborhood. The contours were generated using the ArcGIS CONTOUR tool while applying a Z factor of 3.2808 to convert the elevation values from meters to feet. The filtered contours were then smoothed using the ArcGIS SMOOTH LINE tool. The data include an INDEX field with values of 10 and 100 to flag 10 and 100-foot contours. Note on HUC 01060000310: Due to limitations in the source LIDAR data, some anomalies exist in the generated contours in coastal areas of the state. These were left in the data so that users can determine what further processing best meets their application needs.