49768 ma2004_ensr_hampden_m2577_metadata Data Set Published / External 49401 Lidar - partner (no harvest) Project Completed 2013-10 Spectrum Mapping was tasked by ENSR International (now a subsidiary of AECOM Technology Corporation) to collect LIDAR data and digital ortho imagery to generate breaklines and a bare earth DEM to support 2-foot contour intervals in accordance with FEMA Appendix A. The project area for Connecticut River floodplain was approximately 143 square miles in Hampden County, Massachusetts. The Spectrum aircraft was equipped with the RAMS system, including a 26 Khz Laser, an inertial measurement unit (IMU), and a dual frequency GPS receiver and antenna. The RAMS sensor system also includes a RAMS 4K X 4K color digital camera mounted to the LIDAR unit. The purpose of this project was to collect LIDAR data and digital ortho imagery to generate breaklines and a bare earth DEM to support 2-foot contour intervals in ccordance with FEMA Appendix A. 10412 A footprint of this data set may be viewed in Google Earth at: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2577/supplemental/ma2004_ensr_hampden_footprint.kmz A Lidar Report from the vendor for this data set may be viewed here: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2577/supplemental/ma2004_ensr_hampden_projectreport.pdf Theme ISO 19115 Topic Category elevation Theme ASCII Theme Bare Earth Theme LAZ Office for Coastal Management Charleston SC Data Set As Needed las LiDAR points in LAZ format (ASPRS Class 2) none Any conclusions drawn from the analysis of this information are not the responsibility of ENSR International (AECOM Technology Corporation), Spectrum Mapping, NOAA, the Office for Coastal Management or its partners. Please credit ENSR International and Spectrum Mapping LLC for all products derived from this data. Data Steward 2013-10 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Distributor 2013-10 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Metadata Contact 2013-10 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Point of Contact 2013-10 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Ground Condition -72.868349 -72.253597 42.28869 42.01977 Range 2004-05-13 2004-06-03 Yes Unclassified This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=2577 ; None Users should be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations. These data depict the heights at the time of the survey and are only accurate for that time. https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=2577 Customized Download Create custom data files by choosing data area, product type, map projection, file format, datum, etc. https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2577/index.html Bulk Download Simple download of data files. https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2577/supplemental/ma2004_ensr_hampden_footprint.kmz Browse Graphic Browse Graphic kmz This graphic shows the lidar coverage for Hampden County, Massachusetts. https://coast.noaa.gov Online Resource https://coast.noaa.gov/dataviewer Online Resource 2016-05-23 Date that the source FGDC record was last modified. 2017-11-14 Converted from FGDC Content Standards for Digital Geospatial Metadata (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details. 2018-02-08 Partial upload of Positional Accuracy fields only. 2018-03-13 Partial upload to move data access links to Distribution Info. Elevations are recorded in floating-point meters and the vertical datum is ellipsoidal (GEOID99). Project specifications required a horizontal accuracy of 1.0 meter or greater in order to meet FEMA guidelines for Lidar-based DEMs. Green International Affiliates, Inc collected the 48 control points used below for the RMSE of the project areas. The RMSE below is combined for the Massachusetts and Connecticut project areas. The final RMSEz is 14.7 centimeters (.483 feet). This exceeds the FEMA Guidelines and Specifications for Flood Hazard Mapping. ; Quantitative Value: 0.147 meters, Test that produced the value: Root mean square Z error in bare areas. Units in meters. Elevation data has been collected for all areas inside project boundaries. The data set was flown with a 30% sidelap between flightlines. As part of the field QC process, data voids caused by operational errors are re-collected if required. Spectrum Mapping found no data voids in this project. Spectrum Mapping performs rigorous quality assurance program insures that the final data products meet all requirements prior to delivery to the customer. Quality Assurance / Quality Control is embedded into the overall data acquisition and processing steps. Quality assurance is inherent in developing the project plan, acquisition, verifying data and processing, and assuring that the final products meet all FEMA requirements in accordance with the contract. Spectrum Mapping's quality assurance procedures follow the "FEMA Guidelines and Specifications for Flood Hazard Mapping Partners, Appendix A: Guidance for Aerial Mapping and Surveying" for use of LIDAR mapping technology. 1 Detailed information about Spectum Mapping's data processing procedures can be found in the Project Report located above in the Supplemental_Information section. 2004-01-01T00:00:00 2 The NOAA Office for Coastal Management (OCM) received topographic files in ASCII .CSV format. The files contained bare earth lidar elevation measurements in X,Y,Z format. The data were received in Massachusetts State Plane Mainland Zone 2001, NAD83 coordinates and were vertically referenced to NAVD88 using the Geoid99 model. The vertical units of the data were feet. OCM performed the following processing for data storage and Digital Coast provisioning purposes: 1. The topographic las files were converted from ASCII to LAS format. 2. The classification of all bare earth points was changed from Class 0 to Class 2. 3. The topographic las files were converted from orthometric (NAVD88) heights to ellipsoidal heights using Geoid99. 4. The topographic las files were converted from a Projected Coordinate System (MA SP Mainland) to a Geographic Coordinate System (NAD83). 5. The topographic las files' vertical units were converted from feet to meters. 6. The topographic las files' horizontal units were converted from feet to decimal degrees. 2013-10-01T00:00:00 gov.noaa.nmfs.inport:49768 Anne Ball 2017-11-15T15:22:10 SysAdmin InPortAdmin 2022-08-09T17:11:36 2022-03-16 OCM Partners OCMP 1002 Public No No 2022-03-16 1 Year 2023-03-16