Connecticut LiDAR-based Digital Elevation Data (Beta 1.1)
These elevation data are a research product and not intended for use in management, regulation, litigation, or related activities. They are intended for research, education, and demonstration purposes.
These elevation data were derived through the spatial interpolation of airborne LiDAR data collected in 2000. The point files have been edited to remove anomalous observations, but given the volume of data, there are likely errors still present in the point data as well as in the interpolated surface. The authors of this dataset welcome comments and corrections.
The elevation data are in a gridded (TIFF) format with a horizontal resolution of 10 feet, and a vertical resolution of 1 foot. Though a 10-foot dataset, the LiDAR data from which the elevation surface was interpolated had a horizontal spacing of generally 20 feet. The gridded elevation data are projected into the State Plane Coordinate System Zone 0600, orthometric heights (NAVD 88) in US Survey feet.
More information on the data and the methods by which they were derived can be found in the following documents.
The raster data are available on a USGS 7-1/2 minute quadrangle and on a town basis. Each quadrangle has been extended by 500 feet to permit over-edging with neighboring quad sheets. Further, the Connecticut state boundary has been extended by 200 feet to ensure adequate coverage beyond the state and to enable neighborhood operations such as slope and aspect.
