Aero-Metric, Inc.
20100120
LWP05
1.0
digitial point data
This delivery contains point cloud data in LAS 1.1 format, classified in the following manner. Class 2: Ground, Class 7: Low Point (Noise), Class 10: High Point (Noise), Class 11: First and Only Return (not classified as ground), Class 13: First of Many Returns, Class 14: Second of Many Returns, Class 15: Third of Many Returns, and Class 16: Last of Many Returns (not classified as ground).
The following are the collection parameters and equipment used to create these data sets.
Aircrafts: Cessna 320 (N3443Q) and Piper Navajo (N6GR)
Lidar System: Optech ALTM Gemini (03SEN145)
Approximate Collection Altitude (Above Mean Terrain): 1800 meters
Ground Speed: 180 kts
Pulse Rate Frequency: 70 kHz
Mirror Scan Frequency: 40 Hz
Scan Angle (+/-): 16 degrees
Beam Divergence: Narrow (0.25 mrad)
Accuracy statements are based on areas of moderate terrain, with points classified as ground. Diminished accuracies are to be expected in areas of extreme terrain and dense vegetation. The accuracy of each point is expected to meet the vertical accuracy standard, derived products may be less accurate in areas of extreme terrain and dense vegetation due to a lesser number of points defining the ground in these areas.
Classified data sets such as this one may have varying posting due to some pulses not reaching the ground.
The purpose of this data set is to provide bare-earth processed lidar data over the western lowlands of the Kenai Peninsula, at a minimum point density of 0.5 points per square meter. This project was completed under USGS Contract No. 07CRCN0002, Task Order No. 07002C0021.
20080521
20080522
20080523
20080605
20080606
20080922
ground condition
None Planned
000.00000000
000.00000000
00.00000000
00.00000000
000000.000000
000000.000000
000000.000000
000000.000000
None
Elevation
Topography
Remote Sensing
lidar
Laser
Terrain
Bare-Earth
None
USA
Alaska
Kenai Peninsula
None
Class 2: Ground
Class 7: Low Point (Noise)
Class 10: High Point (Noise)
Class 11: First and Only Return, Not Classified as Ground
Class 13: First of Many Returns
Class 14: Second of Many Returns, Not Classified as Ground
Class 15: Third of Many Returns, Not Classified as Ground
Class 16: Last of Many Returns, Not Classified as Ground
None
May
June
September
2008
Public
None
Aero-Metric, Inc.
Jacques Cloutier
Senior Geodetic Surveyor
mailing and physical address
2014 Merrill Field Drive
Anchorage
Alaska
99501-4116
USA
(907) 272-4495
(907) 274-3265
aerometric@aerometric-ak.com
8:00 am to 5:00 pm Alaska Standard Time
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; lidarTools 1.0.9
Data has been verified using surveyed check points, in the land cover categories required by Appendix A to FEMA's Guidelines and Specifications. All data was collected to meet the National Standard for Spatial Database Accuracy (NSSDA).
Complete
All these data products were acquired at 1800 meters above mean terrain (AMT) and have a horizontal accuracy of 0.7 meter, with a nominal point spacing of 1.4 meters as per manufacturer's specifications, not field verified.
These values were computed by verifying the ground classified lidar data against ground surveyed points in the land cover categories as described by FEMA. The points were collected throughout the project area, by DOWL/HKM. We recommend additional ground truth surveys of the data set to verify the vertical accuracy has not changed due to natural causes, such as techtonic motion or freeze/thaw cycles, and non-natural causes such as road construction. Without ground truth survey checks this data is not recommended for design grade mapping or engineering.
0.445 Feet
Consolidated vertical accuracy at the 95th percentile in open terrain, short grasses, brush, and forested vegetation classes
0.308 Feet
Fundamental vertical accuracy at the 95th percentile in open terrain
0.478 Feet
Supplemental vertical accuracy at the 95th percentile in areas of short grasses
0.876 Feet
Supplemental vertical accuracy at the 95th percentile in areas of low brush
0.849 Feet
Supplemental vertical accuracy at the 95th percentile in areas of forested vegetation
Aero-Metric, Inc.
20100120
LWP05
1.0
digitial point data
Anchorage, Alaska
Aero-Metric, Inc.
WKLA
E:\Working_Directory\6080519_Kenai\Area_A\Point_Cloud_LAS\LWP05.las
lidar
20080521
20080522
20080523
20080605
20080606
20080922
ground condition
System Calibration: Aero-Metric collected data over a previously surveyed area in Palmer, Alaska. Data was collected at the same settings as this project, using two intersecting perpendicular lines. Two GPS ground stations were operating on site in order to minimize GPS error. The data was classified in each line separately for ground and other common features between lines, such as building roofs. This data was processed in TerraMatch 8.001 (TerraSolid, Ltd.), to compute corrections for roll, pitch, heading, and mirror scale. These corrections were applied to the initial processing settings (.res file). The data was reprocessed to verify the corrections were applied properly. The corrected data was then compared to ground surveyed measurements in order to check for any consistent vertical bias. The final step in calibration verified there was minimal vertical noise due to changes in intensity. This was done by comparing elevations of points on the airport runway, one point on a runway stripe and another adjacent point on the pavement.
20080610-20081018
Create a smoothed-best estimated trajectory (SBET) of the sensor at a rate of 200 Hz, by integrating the airborne GPS and IMU data The basis of the GPS coordinates were provided to Aero-Metric by DOWL/HKM, and were referenced to NAD83 (CORS96) with GEOID06 derived orthometric heights. The maximum baseline distance for this area was 16 km, the average base line length was 12 km. The mean GPS positional accuracy for this project was +/- 0.05 meters.
20080728-20080923
Integrate SBET and raw laser data to produce point cloud data in LAS 1.1 format for each flight line.
20080728-20080923
Compute the roll, pitch, heading, and mirror scale correction factors for each flight line, then apply corrections to the corresponding flight line.
20080728-20080925
Automated classification of the bare-earth data from the lidar point cloud using a series of algorithms customized for the types of terrain encountered in the project.
20080821-20100105
Manual classification of any data which appears to be bare-earth but was not properly classified using the automated methods.
20080822-20100118
Create point clouds in LAS 1.1 format for all returns.
20100120
Metadata updated for Bounding coordinates, Spatial Reference info using FGDC template
E:\Working_Directory\6080519_Kenai\Area_A\Point_Cloud_LAS\Western_Kenai_All_LAS_Area_A_Template.xml
20100120
E:\Working_Directory\6080519_Kenai\Area_A\Point_Cloud_LAS\fgdcMetadata\LWP05.xml
0
State Plane Coordinate System 1983
5004
0.999900
-150.0
54.0
1640416.7
0.0
coordinate pair
0.01
0.01
survey feet
North American Datum of 1983(CORS96) EPOCH 2003.0000
Geodetic Reference System 80
6378137.000000
298.257222
GEOID06 (Alaska) Orthometric Heights
0.01
feet
Explicit elevation coordinate included with horizontal coordinates
LAS
'LAS' ASPRS binary data
E:\Working_Directory\6080519_Kenai\Area_A\Point_Cloud_LAS\LWP05.las
C2=169,153
Ground
C11=1,900
First of many returns, not classified as ground.
C13=2,524
First of many returns.
C14=367
Second of many returns.
C15=32
Third of many returns.
C16=4
Last of many returns, not classified as ground.
Aero-Metric, Inc.
Jacques Cloutier
Senior Geodetic Surveyor
mailing and physical address
2014 Merrill Field Drive
Anchorage
Alaska
99501-4116
USA
907-272-4495
907-274-3265
aerometric-ak@aerometric-ak.com
8:00 am to 5:00 pm Alaska Time
Aero-Metric, Inc. assumes no liability for the data
being used for purposes other than stated in this document.
The data are being provided on an 'as is' basis. The USGS specifically
disclaims any warranty, expressed or implied, including, but not limited
to, the implied warranties or merchantability and fitness for a particular
use. The entire risk as to quality and performance is with the user.
In no event will the USGS or its staff be liable for any direct, indirect,
incidental, special, consequential, or other damages, including loss of profit,
arising out of the use of these data even if the USGS has been advised of the
possibility of such damages. All data are intended for resource management use.
Translation of files to formats other than those described here is the sole responsibility
of individuals downloading the data. Although these data have been processed successfully
on a computer system at the USGS, no warranty expressed or implied is made by the USGS
regarding the use of the data on any other system, nor does the act of distribution
constitute any such warranty. Data may have been compiled from various outside sources.
Spatial information may not meet National Map Accuracy Standards. This information may
be updated without notification. The USGS shall not be liable for any activity involving
these data, installation, fitness of the data for a particular purpose, its use, or
analyses results.
None
Varies
ASCII or LAS
None. Downloadable data only.
None
U.S. Geological Survey
EROS Customer Services
Mailing and physical address
Customer Services
U.S. Geological Survey
EROS Data Center
47914 252nd Street
Sioux Falls
SD
57198-0001
US
1-800-252-4547
1-605-594-6933
1-605-594-6589
custserv@usgs.gov
Monday through Friday 8:00 AM to 4:00 PM (Central Time)
The above is the contact information for EROS Data Center in
Sioux Falls, SD. this is the digital data storage and distribution
center for the USGS. For best service, identify your question
as related to "CLICK Lidar Data".
20100120
Aero-Metric, Inc.
Jacques Cloutier
Senior Geodetic Surveyor
mailing and physical address
2014 Merrill Field Drive
Anchorage
Alaska
99501-4116
USA
907-272-4495
907-274-3265
aerometric-ak@aerometric-ak.com
8:00 am to 5:00 pm Alaska Time
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
U.S. Geological Survey
Mailing and physical address
Customer Services
U.S. Geological Survey
EROS Data Center
47914 252nd Street
Sioux Falls
SD
57198-0001
US
1-800-252-4547
1-605-594-6933
1-605-594-6589
custserv@usgs.gov
Monday through Friday 8:00 AM to 4:00 PM (Central Time)
The above is the contact information for EROS Data Center in
Sioux Falls, SD. this is the digital data storage and distribution
center for the USGS. To improve service, identify your question
as related to "CLICK Lidar Data".
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
20050616
en
Point
Point
173980