2010 U.S. Geological Survey (USGS) Topographic LiDAR: Mobile Bay, AL

USGS Contract: G10PC00026

Task Order Number: G10PD00578

LiDAR was collected at a nominal pulse spacing of 2.0 meters for a 700 square mile area to

the east of Mobile Bay, either not previously surveyed using LiDAR sensors or where the collected

data was poor, while no snow was on the ground and rivers were at or below normal levels.

The goal of the NGOM LiDAR project in the post-Katrina environment is to provide scientific

knowledge and tools required to make optimal decisions about land resource use, management

practices, and future development in the northern Gulf of Mexico coastal zone. This regional

LiDAR elevation mapping data will be used for modeling, predicting landscape change, promoting

restoration of ecosystems, and mitigating risks associated with anthropomorphic and natural hazards.

Classified LAS files are used to show the manually reviewed bare earth surface. Any additional

classification is provided via automated macro functionality from proprietary Photo Science TerraScan macros.

These additional classifications include Class 4 - Medium Vegetation and Class 5 - High Vegeation. This

allows the user to create Intensity Images, Break Lines, Raster DEM, and Triangular Irregular Networks.

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The third-party QA report for this data set may be accessed at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1426/supplemental/usgs2010_MobileBay_AL_LidarReport.doc

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

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1426/supplemental/usgs2010_MobileBay_AL_footprint.kmz

LiDAR points in LAS 1.2 format

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Any conclusions drawn from the analysis of this information are not the responsibility

of Photo Science, USGS, 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=1426

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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and some parts of this data may no longer represent actual surface conditions.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.

MicroStation Version 8; TerraScan Version 10; Optech DASHMap 4.1801; TerraModeler Version 10;

GeoCue Version 6.1.21.4; ESRI ArcGIS 9.3; QT Modeler v 7.0.3; Windows XP Operating System

The project area requires LiDAR to be collected on average of 2.0 meter point spacing

or better and vertical accuracy of 15 centimeters RMSE or better to support 2' contour

generation when combined with breaklines.

Classified LAS files were tested by Photo Science for both vertical and horizontal

accuracy. All data is seamless from one tile to the next, no gaps or no data areas.

The vertical unit of the data file is in decimal feet with 2-decimal point precision.

; Quantitative Value: 0.0013 meters, Test that produced the value: RMSE in meters

Datasets contain complete coverage of tiles.

Classified LAS files were tested by Photo Science for both vertical and horizontal accuracy.

All data is seamless from one tile to the next, no gaps or no data areas.