Connecticut Terrain Dataset, version 2 is a digital terrain model of the state of Connecticut in ESRI terrain dataset format. The primary elevation point data sources for the terrain are the Connecticut 2000 LiDAR Masspoints, the Connecticut Coastline 2006 LiDAR Masspoints (ground only), and the Connecticut River 2004 LiDAR Masspoints. The USGS Topographic Map Masspoints provide additional elevation data in areas of data gaps in the Connecticut 2000 LiDAR Masspoints. The terrain also makes use of two boundary feature classes to clip the terrain to the Connecticut state boundary at different scale thresholds. This dataset is labeled "version 2" because as new LiDAR data becomes available, new statewide terrain datasets will be created.
Connecticut Terrain Dataset, version 2 has a wide range of uses including visual display and querying of elevation, slope, aspect, and contours; generation of raster digital elevation models (DEMs) and contour lines; and use as an input for analysis tasks such as creating viewsheds, calculating surface area and volume, and interpolating z-values to other data layers.
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Connecticut 2000 LiDAR Masspoints was a part of the 2004 Statewide Aerial Survey of Connecticut, provided by Aero-Metric, Inc. of Sheboygan, Wisconsin on a contract with the State of Connecticut. TerraPoint LLC of Woodlands, Texas, was subcontracted to create a Connecticut Statewide LiDAR dataset. Connecticut River 2004 LiDAR Masspoints was acquired, processed, and delivered by Spectrum Mapping LLC of Denver, CO for the US Army Corps of Engineers. Connecticut Coastline 2006 LiDAR Masspoints (ground only) was collected and processed by TerraPoint, Inc, project managed by Dewberry, Inc of Fairfax, VA, and reviewed by Roald Haested, Inc for FEMA.
The Connecticut Coastline 2006 LiDAR Masspoints are an elevation data source for the terrain dataset. The data is 3-foot posting covering the Connecticut coastline (minus the mouth of the Connecticut River) and has a vertical accuracy of 0.33 feet at a 95% confidence interval.
The Connecticut 2000 LiDAR Masspoints are an elevation data source for the terrain dataset. The data is 20-foot posting covering the state of Connecticut, and has a horizontal positional accuracy of approximately 3 feet on the ground. However, the data has known limitations, including data gaps.
The Connecticut River 2004 LiDAR Masspoints are an elevation data source for the terrain dataset. The data is 3-foot posting covering the towns along the Connecticut River.
These point data were used to fill in some of the gaps that are a known limitation of the Connecticut 2000 LiDAR Masspoints. This data were derived from contour lines appearing on USGS 1:24,000-scale Digital Raster Graphics (DRGs) by the Center for Land Use Education and Research (CLEAR). The data were further edited by CT DEP to remove points that occurred in areas of dense LiDAR coverage.
This boundary layer is used to clip the terrain. It is a combination of the project areas of the Connecticut 2000 LiDAR Masspoints, the Connecticut River 2004 LiDAR Masspoints, and the Connecticut Coastline 2006 LiDAR Masspoints (ground only).
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