2015 USGS-MDEQ Lidar: Coastal Mississippi QL2

This task is issued under USGS Contract No. G10PC00057, Task Order No. G15PD00091. This task order requires lidar data to be acquired over approximately 5981 square miles. The lidar was collected and processed to meet a maximum Nominal Post Spacing (NPS) of 0.7 meter. The NPS assessment is made against single swath, first return data located within the geometrically usable center portion (typically ~90%) of each swath.

The data was collected using a Leica ALS70 500 kHz Multiple Pulses in Air (MPiA) lidar sensor and a Chiroptera II sensor.

The ALS70 sensor collects up to four returns per pulse, as well as intensity data, for the first three returns. If a fourth return was captured, the system does not record an associated intensity value.

The Chiroptera II sensor provides 35 kHz bathymetric data and up to 500 kHz topographic data. The system acquires bathymetric lidar, topographic lidar and 4-band 80 MP digital camera imagery simultaneously. For this project, the flight parameters were used to provide 100% coverage. Two multiple pulse in air zones were used.

The Coastal delivery was processed and projected in Mississippi State Plane East Zone, NAD83(2011). The vertical datum used for the task order was referenced to NAVD88, GEOID12A/12B in units of US Survey Feet. These data were converted to geographic coordinates with elevation in meters above the ellipsoid for ingest into the NOAA Digital Coast. Further projection and datum processing may have occurred (see process descriptions).

Provide current elevation data in Coastal Mississippi.

10472

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

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/5168/supplemental/

Lidar report for this data set is available here:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/5168/supplemental/Mississippi_Coastal_QL2_Lidar_with_3DEP_Extension_Lidar_Report.pdf

Lidar points in LAZ format (Classes 1,2,7,9,10,17,18)

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Any conclusions drawn from the analysis of this information are not the responsibility of USGS, MDEQ, Woolpert, NOAA, or their partners.

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

https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=5168;

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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.

None reported; Quantitative Value: 1 meters, Test that produced the value: Explicit horizontal accuracy is not reported in the accuracy report provided. Assumptions of 1 meter.

The vertical accuracy statistics were calculated by comparison of the lidar bare earth points to the ground surveyed QA/QC points. Mississippi Coastal QL2 Lidar was processed and delivered in NAD1983(2011) Mississippi State Plane East, NAVD88 Geoid12A meters.; Quantitative Value: 0.166 meters, Test that produced the value: LAS Swath Fundamental Vertical Accuracy (FVA) Tested 0.166 meters fundamental vertical accuracy at a 95 percent confidence level, derived according to NSSDA, in open terrain using (RMSEz) x 1.96000 Tested against the TIN using independent check points.

The LiDAR data is visually inspected for completeness to ensure that are no gaps between flight lines.

All formatted data are validated using commercial GIS software to ensure proper formatting and loading prior to delivery.