State of Connecticut, Department of Energy and Environmental Protection
Connecticut Terrain Dataset, version 1
1
vector digital data
Connecticut Terrain Dataset, version 1 is a digital terrain model of the state of Connecticut in ESRI terrain dataset format. The primary elevation point data source for the terrain is the Connecticut 2000 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 1" because as new LiDAR data becomes available, new statewide terrain datasets will be created.
Connecticut Terrain Dataset, version 1 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.
-73.742172
-71.781365
42.052612
40.988796
None
These data are not consistently accurate statewide. Users should review the following description of source data in order to determine appropriate uses of this information.
The primary point data source is 20-foot posting lidar data collected in 2000, which has a horizontal positional accuracy of approximately 3 feet on the ground. The lidar point data has known limitations including data gaps. The secondary point data source that contributes to the terrain dataset was compiled by Center for Land Use Education and Research (CLEAR) at the University of Connecticut, College of Agriculture and Natural Resources. It is a collection of points intended to fill in gaps in the lidar data with coarser data based on contour lines from USGS topographic maps. Before building the terrain dataset, this secondary point data source was further edited by DEP to remove unnecessary points that occurred in areas of dense lidar point data.
State of Connecticut, Department of Energy and Environmental Protection
Unknown
79 Elm Street
Hartford
CT
06106
US
860-424-3540
860-424-4058
dep.gisdata@ct.gov
Monday to Friday, 08:30 to 16:30 Eastern Standard Time
The primary data source for the terrain, the 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.
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcGIS 10.0.0.2414
http://www.cteco.uconn.edu/metadata/dep/browsegraphic/ctterraindatasetv1elevationfullview.gif
Full view of Connecticut Terrain Dataset Version 1 - Elevation
GIF
http://www.cteco.uconn.edu/metadata/dep/browsegraphic/ctterraindatasetv1contoursfullview.gif
Full view of Connecticut Terrain Dataset Version 1 - Contours
GIF
http://www.cteco.uconn.edu/metadata/dep/browsegraphic/ctterraindatasetv1slopefullview.gif
Full view of Connecticut Terrain Dataset Version 1 - Slope
GIF
http://www.cteco.uconn.edu/metadata/dep/browsegraphic/ctterraindatasetv1aspectfullview.gif
Full view of Connecticut Terrain Dataset Version 1 - Aspect
GIF
http://www.cteco.uconn.edu/metadata/dep/browsegraphic/ctterraindatasetv1elevationdetailview.gif
Detail view of Connecticut Terrain Dataset Version 1 - Elevation
GIF
http://www.cteco.uconn.edu/metadata/dep/browsegraphic/ctterraindatasetv1contoursdetailview.gif
Detail view of Connecticut Terrain Dataset Version 1 - Contours
GIF
http://www.cteco.uconn.edu/metadata/dep/browsegraphic/ctterraindatasetv1slopedetailview.gif
Detail view of Connecticut Terrain Dataset Version 1 - Slope
GIF
http://www.cteco.uconn.edu/metadata/dep/browsegraphic/ctterraindatasetv1aspectdetailview.gif
Detail view of Connecticut Terrain Dataset Version 1 - Aspect
GIF
http://www.cteco.uconn.edu/metadata/dep/browsegraphic/CT Terrain Dataset v1 Data Sources.jpg
Coverage of data sources in Connecticut Terrain Dataset Version 1
JPG
Connecticut 2000 LiDAR Masspoints
None
Connecticut 2000 LiDAR Masspoints
The Connecticut 2000 LiDAR Masspoints are the main 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.
USGS Topographic Map Masspoints
None
USGS Topographic Map Masspoints
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.
Connecticut Boundary
None
Connecticut Boundary
This boundary layer is used to clip the terrain dataset to the state boundary when the terrain is displayed at large scales (specifically, at a maximum scale of 1:25,000).
Connecticut 1:125,000-scale boundary
1:125,000
None
Connecticut 1:125,000-scale boundary
This boundary layer is used to clip the terrain dataset to the state boundary when the terrain is displayed at small scales (specifically, at a minimum scale of 1:25,001).
Vector
GT-polygon composed of chains
1
Entity point
62152
Composite object
49611
GT-polygon composed of chains
263
NAD 1983 StatePlane Connecticut FIPS 0600 Feet
41.2
41.86666666666667
-72.75
40.83333333333334
999999.999996
499999.999998
coordinate pair
0.0003280833333333334
0.0003280833333333334
Foot_US
D North American 1983
GRS 1980
6378137.0
298.257222101
20110523
State of Connecticut, Department of Energy and Environmental Protection
Courtney Larson
Unknown
79 Elm Street
Hartford
CT
06106-5127
USA
860-424-3540
860-424-4058
dep.gisdata@ct.gov
Monday to Friday, 08:30 to 16:30 Eastern Standard Time
FGDC Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998