Quantum Spatial, Inc.
20181214
Missouri 2017 LiDAR - Delivery 4; Hydro-Flattened DEM
Raster digital data
Product: These are Digital Elevation Model (DEM) data for Southern Missouri
as part of the required deliverables for the Missouri 2017 LiDAR - Delivery 4 Lidar
project. Class 2 (ground) lidar points in conjunction with the hydro breaklines were
used to create a 1-meter hydro-flattened raster DEM. Geographic Extent: The AOI
includes 7 counties in Southern Missouri, covering approximately 3734 total square
miles. Dataset Description: The Missouri 2017 LiDAR - Delivery 4 project called for
the planning, acquisition, processing, and derivative products of lidar data to be
collected at a nominal pulse spacing (NPS) of 0.7 meters. Project specifications are
based on the U.S. Geological Survey National Geospatial Program Base LiDAR
Specification, Version 1.2. The data were developed based on a horizontal
projection/datum of NAD 1983 (2011), UTM Zone 15N, meters and vertical datum of NAVD
1988 (GEOID 12B), meters. LiDAR data were delivered as processed Classified LAS 1.4
files formatted to 4428 individual 1,500-meter x 1,500-meter tiles, as tiled
intensity imagery, and as tiled bare earth DEMs; all tiled to the same 1,500-meter x
1,500-meter schema. Continuous breaklines were produced in Esri file geodatabase
format. Ground Conditions: LiDAR was collected in winter of 2017/2018 and spring of
2018, while no snow was on the ground and rivers were at or below normal levels. In
order to post process the LiDAR data to meet task order specifications and meet
ASPRS vertical accuracy guidelines, Quantum Spatial, Inc. utilized a total of 231
ground control points that were used to calibrate the LiDAR to known ground
locations established throughout the project area. An additional 380 independent
accuracy checkpoints, 224 in Bare Earth and Urban landcovers (224 NVA points), 156
in Tall Weeds categories (156 VVA points), were used to assess the vertical accuracy
of the data. These checkpoints were not used to calibrate or post process the
data.
To acquire detailed surface elevation data for use in conservation planning,
design, research, floodplain mapping, dam safety assessments and elevation modeling,
etc. Classified LAS files are used to show the manually reviewed bare earth surface.
This allows the user to create intensity images, breaklines and raster DEMs. The
purpose of these LiDAR data was to produce high accuracy 3D hydro-flattened digital
elevation models (DEMs) with a 1-meter cell size. These raw LiDAR point cloud data
were used to create classified LiDAR LAS files, intensity images, 3D breaklines, and
hydro-flattened DEMs as necessary.
Raster File Type = IMG Bit Depth/Pixel Type = 32-bit float Raster Cell Size =
1.0 Meters Interpolation or Resampling Technique = Triangulated Irregular Network
(TIN), Linear Interpolation, Proprietary
20171201
20180424
ground condition
None planned
-93.63357296
-92.45580769
38.69397813
37.41394635
None
Model
Raster
DEM
Remote Sensing
Elevation Data
Lidar
None
State of Missouri
Camden County
Dallas County
Hickory County
Laclede County
Miller County
Morgan County
Polk County
No restrictions apply to these data.
All deliverable data and documentation shall be free from restrictions regarding
use and distribution. Data and documentation provided under this Task Order shall be
freely distributable by government agencies. However, users should be aware that
temporal changes may have occurred since this dataset was collected and that some parts
of these data may no longer represent actual surface conditions. Users should not use
these data for critical applications without a full awareness of their
limitations.
Data cover the entire area specified for this project.
Datasets contain complete coverage of tiles. No points have been removed or
excluded. A visual qualitative assessment was performed to ensure data completeness.
There are no void areas or missing data. The raw point cloud is of good quality and data
passes Non-Vegetated Vertical Accuracy specifications.
The project specifications require the accuracy (ACCz) of the derived DEM
be calculated and reported in two ways: 1. The required NVA is: 19.6 cm at a 95%
confidence level, derived according to NSSDA, i.e., based on RMSE of 10 cm in
the "bare earth" and "urban" land cover classes. This is a required accuracy.
The NVA was tested with 224 checkpoints located in bare earth and urban
(non-vegetated) areas. 2. Vegetated Vertical Accuracy (VVA): VVA shall be
reported for "tall weeds" land cover classes. The target VVA is: 29.4 cm at the
95th percentile, derived according to ASPRS Guidelines, Vertical Accuracy
Reporting for LiDAR Data, i.e., based on the 95th percentile error in all
vegetated land cover classes combined. This is a target accuracy. The VVA was
tested with 156 checkpoints located in forested and tall weeds (vegetated)
areas. The checkpoints were distributed throughout the project area and were
surveyed using GPS techniques. See survey report for additional survey
methodologies. AccuracyZ has been tested to meet 19.6 cm or better Non-Vegetated
Vertical Accuracy at 95% confidence level using RMSE(z) x 1.9600 as defined by
the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported
using National Digital Elevation Program (NDEP)/ASRPS Guidelines.
0.106
Tested 0.106 meters NVA at a 95% confidence level using RMSE(z) x
1.9600 as defined by the National Standards for Spatial Data Accuracy
(NSSDA). The NVA of the DEM was calculated using 224 independent checkpoints
located in the Bare Earth and Urban land cover categories.
0.142
Tested 0.142 meters VVA was calculated using 156 checkpoints located
in the Forested and Tall Weeds land cover categories at the 95th percentile,
derived according to ASPRS Guidelines, Vertical Accuracy Reporting for LiDAR
Data. Tested against the DEM.
Hydro-Flattened Raster DEM Processing: Class 2 (Ground) LiDAR points in
conjunction with the hydro-breaklines were used to create a 1-meter
hydro-flattened raster DEM. Using automated scripting routines within ArcMap, an
ERDAS Imagine .IMG file was created for each tile. Each surface was reviewed
using Global Mapper to check for any surface anomalies or incorrect elevations
found within the surface.
2018
Raster
Pixel
1500
1500
Universal Transverse Mercator
15
0.9996
-93
0
500000
0
coordinate pair
1.0
1.0
meters
NAD 1983 (2011)
Geodetic Reference System 80
6378137.0
298.257222101
NAVD 1988 (GEOID 12B)
0.01
meters
Explicit elevation coordinate included with horizontal coordinates
20181210
Quantum Spatial
mailing and physical
523 Wellington Way
Lexington
KY
40503
USA
859-277-8700
859-277-8901
Monday through Friday 8:00 AM to 5:00 PM (Eastern Time)
If unable to reach the contact by telephone, please send an email. You
should get a response within 24 hours.
FGDC Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998
None.
None.
None.
Unclassified
NONE