gov.noaa.nmfs.inport:49615 eng UTF8 dataset OCM Partners resourceProvider NOAA Office for Coastal Management (843) 740-1202 2234 South Hobson Ave Charleston SC 29405-2413 coastal.info@noaa.gov https://coast.noaa.gov WWW:LINK-1.0-http--link NOAA Office for Coastal Management Website NOAA Office for Coastal Management Home Page information pointOfContact 2026-04-30T00:00:00 ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for imagery and gridded data ISO 19115-2:2009(E) Connecticut Statewide LiDAR 2016 - Blocks 1-7 2016_CT_m8392_metadata 2017-10-20 publication NOAA/NMFS/EDM 49615 https://www.fisheries.noaa.gov/inport/item/49615 WWW:LINK-1.0-http--link Full Metadata Record View the complete metadata record on InPort for more information about this dataset. information https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8392/supplemental/Final_LiDAR_Report_CRCOG_2016.pdf WWW:LINK-1.0-http--link Lidar Report Link to the Lidar Report. download http://crcog.org WWW:LINK-1.0-http--link Citation URL Online Resource download https://coast.noaa.gov/dataviewer WWW:LINK-1.0-http--link Citation URL Online Resource download https://coast.noaa.gov WWW:LINK-1.0-http--link Citation URL Online Resource download This metadata record describes the Classified Point Cloud (LAS) for the 2016 Connecticut LiDAR project covering approximately 5240 square miles in seven blocks. The Leica ALS-70-HP and Riegl LMS-Q680i systems were used to collect data for the survey campaign. To acquire detailed surface elevation data for use in conservation planning, design, research, floodplain mapping, dam safety assessments, and hydrologic modeling. LAS data products are suitable for 1 foot contour generation. USGS LiDAR Base Specification 1.2, QL2. 19.6 cm NVA. completed NOAA Office for Coastal Management (843) 740-1202 2234 South Hobson Ave Charleston SC 29405-2413 coastal.info@noaa.gov https://coast.noaa.gov WWW:LINK-1.0-http--link NOAA Office for Coastal Management Website NOAA Office for Coastal Management Home Page information pointOfContact NOAA Office for Coastal Management (843) 740-1202 2234 South Hobson Ave Charleston SC 29405-2413 coastal.info@noaa.gov https://coast.noaa.gov WWW:LINK-1.0-http--link NOAA Office for Coastal Management Website NOAA Office for Coastal Management Home Page information custodian unknown ALS70 Bare Earth Contour Digital Elevation Model (DEM) Digital Terrain Model (DTM) First Return Grid IMG Intensity return LAS LMS-Q680i LiDAR Overlap points Unclassified points Water points ground points mapping point cloud Connecticut United States theme CT 2016 temporal Lidar - partner (no harvest) project InPort otherRestrictions Cite As: OCM Partners, [Date of Access]: Connecticut Statewide LiDAR 2016 - Blocks 1-7 [Data Date Range], https://www.fisheries.noaa.gov/inport/item/49615. NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose. otherRestrictions Access Constraints: This data may be used by the requesting party at their own risk and may be re-distributed. otherRestrictions Use Constraints: This data is for planning purposes only and should not be used for legal or cadastral purposes. Any conclusions drawn from analysis of this information are the responsibility of the user. Users should be aware that temporal changes may have occurred since this dataset was collected and some parts of this dataset may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of its limitations. otherRestrictions Distribution Liability: The Capitol Region Council of Governments digital data have been tested and their documentation carefully reviewed. However, the Capitol Region Council of Governments and its representatives make no warranty or representation, either expressed or implied, with respect to the digital data and their documentation, their quality, performance, merchantability, or fitness for a particular purpose. The digital data are distributed on "as is" basis, and the user assumes all risk to their quality, the results obtained from their use, and the performance of the data. In no event will the Capitol Region Council of Governments or its representatives be liable for any direct, indirect, special, incidental or consequential damages resulting from and defect in the State of Connecticut or in their documentation. This disclaimer of warranty is exclusive and in lieu of all others, oral or written, express or implied. No agent or employee is authorized to make any modification, extension, or addition to this warranty. Any conclusions drawn from the analysis of this information are not the responsibility of the Capitol Region Council of Governments, the Office for Coastal Management or its partners. unclassified Connecticut Statewide Lidar DEM 2016 NOAA/NMFS/EDM 49408 crossReference vector eng; US elevation oceans -73.745809 -71.782632 40.971166 42.063615 | Currentness: Ground Condition 2016-03-11 2016-04-16 Data were changed for ingest in the Digital Coast Data Access Viewer. Original Project Projection, Datums and Units: Projection - State Plane Connecticut; Horizontal datum - North American Datum of 1983 (NAD83 (2011)); Vertical datum - North American Vertical Datum of 1988 (NAVD88) using the latest geoid (Geoid12b) for converting ellipsoidal heights to orthometric heights; Units - US feet Data were changed to geographic coordinates (NAD83(2011)). The vertical datum was reverted to ellipsoid heights (using Geoid12b) in meters. Custom orders of this data may have changed these coordinate systems, which will be reflected in the spatial organization section. A data report is available at https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8392/supplemental/Final_LiDAR_Report_CRCOG_2016.pdf The following are the USGS lidar fields in JSON: { "ldrinfo" : { "ldrspec" : "USGS Base Specification 1.2, QL2 meeting 19.6cm VVA", "ldrsens" : "Leica ALS70", "ldrmaxnr" : "4", "ldrnps" : "0.67", "ldrdens" : "2.2", "ldranps" : "0.67", "ldradens" : "2.2", "ldrfltht" : "2180", "ldrfltsp" : "140", "ldrscana" : "40", "ldrscanr" : "51.3", "ldrpulsr" : "251", "ldrpulsd" : "10", "ldrpulsw" : "0.49", "ldrwavel" : "1064", "ldrmpia" : "1", "ldrbmdiv" : "0.3", "ldrswatw" : "1587", "ldrswato" : "30", "ldrcrs" : "NAD_1983_2011_StatePlane_Connecticut_FIPS_0600_Ft_US", "ldrgeoid" : "NGS Geoid12b" }, "ldraccur" : { "ldrchacc" : "0.196", "rawnva" : "0.138", "rawnvan" : "181", "clsnva" : "0.125", "clsnvan" : "181", "clsvva" : "0.170", "clsvvan" : "95" }, "lasinfo" : { "lasver" : "1.4", "lasprf" : "6", "laswheld" : "Withheld points were identified in these files with the withheld flag", "lasolap" : "Overlap points were identified in these files with the overlap flag", "lasintr" : "16", "lasclass" : { "clascode" : "1", "clasitem" : "Unclassified" }, "lasclass" : { "clascode" : "2", "clasitem" : "Bare earth" }, "lasclass" : { "clascode" : "7", "clasitem" : "Noise" }, "lasclass" : { "clascode" : "9", "clasitem" : "Water" }, "lasclass" : { "clascode" : "10", "clasitem" : "Ignored Ground (Breakline Proximity)" }, "lasclass" : { "clascode" : "17", "clasitem" : "Bridges" }, "lasclass" : { "clascode" : "18", "clasitem" : "High Noise" } }} false eng false USGA Base Specification 1.2, QL2 meeting 19.6 cm VVA Zip Zip LAS/LAZ - LASer Zip NOAA Office for Coastal Management (843) 740-1202 2234 South Hobson Ave Charleston SC 29405-2413 coastal.info@noaa.gov https://coast.noaa.gov WWW:LINK-1.0-http--link NOAA Office for Coastal Management Website NOAA Office for Coastal Management Home Page information distributor https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8392 WWW:LINK-1.0-http--link Customized Download Create custom data files by choosing data area, product type, map projection, file format, datum, etc. download https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8392/index.html WWW:LINK-1.0-http--link Bulk Download Simple download of data files. download dataset Accuracy State of Connecticut: The LiDAR surface was evaluated using a collection of 181 GPS surveyed checkpoints for the raw NVA report. The DEM was compared to these checkpoints yielding a better result than was required for the project. Raw NVA Control Accuracy Report (feet) --------- Report Disclaimer --------- This report does not guarantee accuracy. The report only reflects one statistical representation of the control points, LIDAR data and surface used. This report does not replace a thorough quality control process. --------- Report Summary --------- Average dz 0.004 Minimum dz -0.829 Maximum dz 0.622 Average magnitude 0.170 Root mean square 0.227 Std deviation 0.228 ---------------------------------------------------------------------------------------- Attribute accuracy is tested after the LiDAR processing stage. After classification of the LiDAR data, DEMs are created using the bare earth points. The NVA report is generated from the comparison of the DEM and the ground control collected within the project area. The DEM surface was evaluated using a collection of 181 GPS surveyed checkpoints for the NVA report. The DEM was compared to these checkpoints yielding much better result than was required for the project. NVA Control Accuracy Report (feet) --------- Report Disclaimer --------- This report does not guarantee accuracy. The report only reflects one statistical representation of the control points, LIDAR data and surface used. This report does not replace a thorough quality control process. --------- Report Summary --------- Average dz 0.004 Minimum dz -0.778 Maximum dz 0.576 Average magnitude 0.158 Root mean square 0.207 Std deviation 0.207 ---------------------------------------------------------------------------------------- Attribute accuracy is tested after the LiDAR processing stage. After classification of the LiDAR data, DEMs are created using the bare earth points. The VVA report is generated from the comparison of the DEM and the ground control collected within the project area. The DEM was evaluated using a collection of 95 GPS surveyed checkpoints. The DEM was compared to these checkpoints yielding much better result than was required for the project. VVA Control Accuracy Report (feet) --------- Report Disclaimer --------- This report does not guarantee accuracy. The report only reflects one statistical representation of the control points, LIDAR data and surface used. This report does not replace a thorough quality control process. --------- Report Summary --------- Average dz 0.147 Minimum dz -0.771 Maximum dz 0.625 Average magnitude 0.212 Root mean square 0.261 Std deviation 0.217 ---------------------------------------------------------------------------------------- | Quantitative Value: 0 | Quantitative Test Explanation: N/A Horizontal Positional Accuracy Horizontal positional accuracy for the Connecticut LiDAR is dependent upon the quality of the GPS/INS solution, sensor calibration and ground conditions at the time of data capture. The data set was produced to meet ASPRS Positional Accuracy Standards for Digital Geospatial Data (2014) for a 1.0 meter RMSEx/RMSEy.; Quantitative Value: 1.0 meters, Test that produced the value: For the Connecticut, this value is computed by comparing ground control to a DEM derived from the classified LiDAR data and represents the RMSE of residuals on controls within the project area. Vertical Positional Accuracy For the DEM data derived from the classified point cloud, the NVA and VVA were computed. The vertical accuracy was tested with independent survey check points located in various terrain types within Connecticut. These check points were not used in the calibration or post processing of the lidar point cloud data. The survey check points were distributed throughout the block area. Specifications for this project require that the VVA be 19.6 cm or better @ 95 percent confidence level. The raw NVA was tested using 181 independent survey check points located in flat terrain types within the state of Connecticut. The survey checkpoints were distributed throughout the block area. The 181 independent check points were surveyed using static GPS base stations collecting point location for 20 minute intervals. Elevations were measured for the x,y,z location of each check point. Elevations interpolated from the DEM surface were then compared to the elevation values of the surveyed control. This data set was tested to meet ASPRS Positional Accuracy Standards for Digital Geospatial Data (2014) for a 10cm RMSEz Vertical Accuracy Class. Actual NVA accuracy was found to be RMSEz = 7cm, equating to +/- 13.8cm at 95% confidence level. The NVA was tested using 181 independent survey check points located in bare earth terrain types within the state of Connecticut. The 181 independent check points contained all NVA points and were surveyed using static GPS base stations collecting point location for 20 minute intervals. Elevations were measured for the x,y,z location of each check point. Elevations interpolated from the DEM surface were then compared to the elevation values of the surveyed control. This data set was tested to meet ASPRS Positional Accuracy Standards for Digital Geospatial Data (2014) for a 10cm RMSEz Vertical Accuracy Class. Actual NVA accuracy was found to be RMSEz = 6.3cm, equating to +/- 12.5cm at 95% confidence level. The VVA was tested using 95 independent survey check points located in various vegetation terrain types within the state of Connecticut. The 95 independent check points were surveyed using static GPS base stations collecting point location for 20 minute intervals. Elevations were measured for the x,y,z location of each check point. Elevations interpolated from the DEM surface were then compared to the elevation values of the surveyed control. This data set was tested to meet ASPRS Positional Accuracy Standards for Digital Geospatial Data (2014) for a 10cm RMSEz Vertical Accuracy Class. Actual NVA accuracy was found to be RMSEz = 6.3cm, equating to +/- 12.5cm at 95% confidence level. Actual VVA accuracy was found to be +/- 17cm at the 95th percentile. Completeness Report LiDAR data is collected for the project area. Post processing of the simultaneously acquired GPS/INS is performed and applied to the laser returns to output a point cloud in the specified project coordinate system and datums. The point cloud data is then subjected to automated classification routines to assign all points in the point cloud to ground, water, overlap and unclassified point classes. Anomalous laser returns that occur infrequently are removed entirely from the data set. Once clean bare earth points are established, DEMs are created using bare earth points and hydro features. The DEM surface is then compared to the survey checkpoints. These accuracies must pass the NVA and VVA accuracy specifications. Conceptual Consistency LiDAR data is collected within the project area and processed. After the DEMs were created, the dataset was verified against control. Well-distributed control was collected for the entire state of Connecticut. Accuracy is reported for the state as a whole. Lidar data collected over the state of Connecticut and processed to a classified point cloud. Ingested into the Digital Coast Data Access Viewer system. At selected locations throughout the site, accurate GPS coordinates and elevations are surveyed and the points are marked with targets. | Source Produced: Ground control 2016-01-01T00:00:00 New LiDAR data is captured for the project area using a Leica ALS70 LiDAR instrument an integrated IPAS20 GPS/INS system mounted within a Aero Commander twin engine airplane. 2016-01-01T00:00:00 The airborne GPS data is post-processed in Inertial Explorer software and LEICA CloudPro software to determine the LiDAR sensor's angle and orientation in the terrain (project) coordinate system and datums during the survey. 2016-01-01T00:00:00 The post processed GPS/INS solution is applied to the raw lidar data to orient and project the data points into the project area reference system as an unclassified point cloud. | Source Produced: Classified lidar 2016-01-01T00:00:00 The georeferenced lidar data is then classified and edited in Terrasolid Terrascan software. Data is classified to produce: Class 1: unclassified, Class 2: ground, Class 7: low point, Class 9: water, Class 10: ignored ground, Class 17: bridge deck, Class 18: high noise. | Source Produced: Classified lidar 2016-01-01T00:00:00 The classified lidar data is exported as 2500 X 2500 foot tiles in the LAS format with any or all classes required to produce derivative products. | Source Produced: Classified lidar 2016-01-01T00:00:00 The NOAA Office for Coastal Management (OCM) received the files in las 1.4 format. The files contained Lidar elevation and intensity measurements. The data were in Connecticut State Plane (NAD83 2011 Epoch 2010.0; FIPS 0600), US Feet coordinates and NAVD88 (Geoid12b) vertical feet. OCM performed the following processing to the data to make it available within the Digital Coast: 1. The data were converted from Connecticut State Plane coordinates to geographic coordinates. 2. The vertical units of the data were converted from feet to meters. 3. The data were converted from NAVD88 (orthometric) heights to NAD83(2011) ellipsoid heights using Geoid12b grids. 4. Data were compressed with laszip as native LAS 1.4. 2017-10-01T00:00:00 NOAA Office for Coastal Management (843) 740-1202 coastal.info@noaa.gov processor Source Contribution: The classified lidar point cloud is used to derive various data products such as, but not limited to, bare earth gridded DEM, triangulated irregular networks (TIN), contours, digital surface models (DSM). The output format is fully compliant LAS v1.4, Point Record Format 6 | Source Geospatial Form: Point digital data | Type of Source Media: disk 1200 Classified lidar 2016 Source Contribution: Targeted ground control is used to create a digital control file and control report as well as QC check of LiDAR accuracy. Predefined points (NGS when available) within the project area are targeted. | Source Geospatial Form: tabular digital data | Type of Source Media: disc Ground control 2010-01-01 publication 2016 Source Contribution: Aerial LiDAR and GPS/IMU data are recorded for the defined project area at an altitude, flight speed, scanner swath width and scanner pulse frequency to achieve the design goals of the project. | Source Geospatial Form: Remote sensing image | Type of Source Media: disc LiDAR Data 2016 Source Contribution: Post processed GPS/INS is applied to the lidar point data to georeference each point in the project coordinate system | Source Geospatial Form: Tabular digital data | Type of Source Media: disk 1200 Post processed GPS/INS 2016 Source Contribution: The post processed lidar data has been projected and oriented in the specified coordinate system as an un-classified point cloud. | Source Geospatial Form: Point digital data | Type of Source Media: Disk 1200 Post processed lidar 2016 Source Contribution: The tile definition defines discreet non-overlapping rectangular areas used as cut lines to break up the large classified lidar dataset into smaller, more manageable data tiles. Each tile is 2500ft by 2500ft in dimension. | Source Geospatial Form: raster digital data | Type of Source Media: disk 1200 Tile Definition 2016