2005 NCALM Plum Island-Woods Hole Marine Biological Laboratory

The survey area is an irregular polygon (148 square kilometers) at the Plum Island River in northeast Massachusetts. The eastern third of the polygon was flown on Monday April 18, 2005. The central third was flown early Tuesday morning April 19, 2005 and the last third (the Parker River area) was flown on the afternoon of the 19th.

Collected as part of the National Center for Airborne Laser Mapping research, combining land-use classification and change analysis to provide a means of analyzing an important geomorphological metric that has not been possible before.

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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/geoid18/2554/supplemental/ma2005_nsf_pi_woods_hole_m2554.kmz .

A report documenting project notes is available at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2554/supplemental/ma2005_nsf_pi_woods_hole_notes_m2554.pdf .

A processing report for this project is available at: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/2554/supplemental/ma2005_nsf_pi_woods_hole_processingreport_m2554.pdf

The lidar classification are stored in LAZ format: 1 - unclassified, 2 - ground

All deliverables meet specifications in contract. LAS Files meet ASPRS Classification Standards

Any conclusions drawn from the analysis of this information are not the responsibility of NCALM, NSF, OpenTopography, Marine Biological Laboratory, 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=2554

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

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be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions.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

Unknown; Quantitative Value: 1.0 meters, Test that produced the value: Horizontal accuracy is not explicitly stated, default value of 1 m

Unknown; Quantitative Value: 0.09 meters, Test that produced the value: The standard deviation of the differences between the ALTM nearest neighbor shot and the ground truth points was about 9 cm on all flights. After analysis, all trajectories showed height shifts of between 10 and 15 cm.

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In order to provide on-site calibration and ground truth, a section of the Plum Island Turnpike running east and west just north of the project polygon was surveyed using vehicle-mounted GPS, and then surveyed with the ALTM during the flight. Comparisons were made between the heights of the vehicle-collected GPS and the airborne laser scanner. This allowed for a check on the calibration of the airborne scanner as well as a measure of the accuracy of the scanner heights.