2006 FEMA New Jersey Flood Mitigation Lidar: Highlands Area

Light Detection and Ranging (LiDAR) data is remotely sensed high-resolution elevation data collected by an airborne collection platform. LiDAR was flown for approximately 1675 square miles in Passaic, Sussex, Bergen, Morris, Warren, Hunterdon, and Somerset Counties in New Jersey and a small part of Orange County, New York with an Root Mean Square Error (RMSE) of 18.5 centimeters vertically and 95% confidence level.

This data will be used by the NJ Highlands Council and/or the United States Army corps of Engineers (USACE) to generate contours for use in watershed analysis and model development, and for assessing environmental impacts. The LiDAR was flown during leaf-off, no snow on the ground, and water levels in streams that were at normal or below base level.

Original contact information:

Contact Org: New Jersey Highlands Council

Phone: 908-879-6737

The purpose of this LiDAR dataset was to produce high accuracy 3-dimensional elevation based on geospatial products for the NJ Highlands Region. LiDAR was collected on average of two meter point spacing or better in order to create high resolution Digital Elevation Models (DEM).

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A footprint of this data set may be viewed in Google Earth at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/553/supplemental/2006_nj_highlands_m553.kmz

The lidar survey report for this data set may be viewed in Google Earth at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/553/supplemental/nj2006_nj_highlands_pointsurvey_m553.pdf

LAS points classified as 1,2,9

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Any conclusions drawn from the analysis of this information are not the responsibility of NJ DEP, NOAA, the Office for Coastal Management or its partners.

This data can be obtained on-line at the following URL:

https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=553

This data set is dynamically generated based on user-specified parameters.;

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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be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions.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.

Lidar data was collected and processed in accordance with FEMA guidance and specifications, as published in Appendix A: Guidance for Aerial

Mapping and Surveying, April 2003.

The lidar data fully comply with FEMA guidance as published in Appendix A: Guidance for Aerial Mapping and Surveying, April 2003.

The lidar data fully comply with FEMA guidance as published in Appendix A: Guidance for Aerial Mapping and Surveying, April 2003 and the National

Standard for Spatial Accuracy (NSSDA). When compared to GPS survey grade points in generally flat non-vegetated areas, at least 95% of the

positions have an error less than or equal to 36.3 cm (equivalent to a RMSEz of 18.5 if errors are normally distributed).

Ground condition was leaf-off, no snow on ground, and water level in streams that were at normal or below base level for flights and no cloud cover was allowed between the aircraft's sensor and the ground. There are no data voids in coverage.

Deliverables were tested by Photo Science for both vertical and horizontal accuracy as stated in FEMA's Guidelines and Specifications for Flood Hazard Mapping Partners [April 2003]. This includes obtaining at a minimum thirty-five QC ground control survey points randomly selected throughout the project area and agreed upon between Photo Science and the USACE. All data is seamless from one tile to the next, no gaps or no data void areas.