Aerometric
200120627
MatSu Core Area Point Clouds
1.0
digital point data
This delivery contains point cloud data in LAS 1.2 format, classified in the following manner. Class 1: Unclassified Class 2: Ground, Class 3: Low Vegetation (less than 6 feet above ground surface), Class 4: Medium Vegetation (between 6 and 15 feet above ground surface), Class 5: High Vegetation (greater than 15 feet above ground surface), Class 6: Buildings, Class 7: Error Points, Class 8: Contour Keypoints, Class 9: Water, Class 10: Breakline proximity ground points, Class 11: Powerlines, Class 13: Noise (unclassifed data 1 foot or less above ground), Class 14: Bridge Deck.
The following are the collection parameters and equipment used to create these data sets. The Leica sensor was used for flights in the northern half of the Core Area. All other flights were flown with Optech sensors.
Aircraft: Cessna 310(N7516Q), Piper Navajos (N6GR,T73TM and 812TB), Beechcraft KingAir (N898WW)
Lidar Systems: Optech ALTM Gemini (03SEN145 and 07SEN201) and Leica ALS 70
Approximate Collection Altitude (Above Mean Terrain): Optech--1400 meters, Leica--2200 meters
Ground Speed: Optech--150 kts, Leica--160 kts
Pulse Rate Frequency: Optech--70 kHz, Leica--163.6 kHz
Mirror Scan Frequency: Optech--40 Hz, Leica--41 Hz
Scan Angle (+/-): Optech--17 degrees, Leica--16 Degrees
Beam Divergence: Narrow (0.3 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 lidar-derived topographic data for the Matanuska-Susitna Borough.
20110510
20110511
20110512
20110513
20110518
20110524
20110525
20110526
20110527
20110812
20110829
20110411
20120822
20120828
20120829
ground condition
None Planned
-149.823862
61.813469
-149.157383
61.362332
None
Elevation
Topography
Remote Sensing
Lidar
Laser
Terrain
Bare-Earth
None
USA
Alaska
Core
None
Class 1: Unclassified
Class 2: Ground
Class 3: Low Vegetation (Less than 6 feet above ground surface)
Class 4: Medium Vegetation (Between 6 and 15 feet above ground surface)
Class 5: High Vegetation (More than 15 feet above ground surface)
Class 6: Buildings
Class 8: Contour Keypoints
Class 7: Error Points (Noise)
Class 9: Water
Class 10: Breakline proximity ground points
Class 11: Powerlines
Class 13: Noise (unclassifed data 1 foot or less above ground)
Class 14: Bridge Deck
None
May
August
October
2011
2012
Public
None
Aerometric, Inc.
Lidar Manager
Lidar Manager
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 ground survey points collected by Lounsbury and Associates, Inc. and Aerometric, Inc.
Not Complete
No horizontal accuracy verifications have been completed
Tested 0.176 meters fundamental vertical accuracy at 95 percent confidence level in open terrain using RMSEz x 1.9600. Tested 0.307 meters supplemental vertical accuracy at 95th percentile in developed areas. Tested 0.400 meters supplemental vertical accuracy at 95th percentile in forested areas. Tested 0.331 meters supplemental vertical accuracy at 95th percentile in shrub areas. Tested 0.618 meters supplemental vertical accuracy at 95th percentile in wetlands areas. Tested 0.322 meters consolidated vertical accuracy at 95th percentile in: open terrain, developed, forest, shrub and wetlands areas.
Aerometric
200120627
MatSu Core Area Point Clouds
1.0
digital point data
MSCL
Aerometric
lidar
20110510
20110511
20110512
20110513
20110518
20110524
20110525
20110526
20110527
20110812
20110829
20110411
20120822
20120828
20120829
ground condition
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 Lounsbury, Inc., and were referenced to NAD83 (CORS96) with GEOID09 derived orthometric heights. The maximum baseline distance for this area was 15 km, the average base line length was 5 km. The mean GPS positional accuracy for this area was +/- 0.06 meters.
20110511-20111012
Integrate SBET and raw laser data to produce point cloud data in LAS 1.2 format for each flight line.
20110511-20111012
Data Calibration: An in-situ calibration was performed using the data collect for this project. 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 11.001 (TerraSolid, Ltd.), to compute corrections for roll, pitch, heading, and mirror scale. These corrections are applied in order to minimize discrepancies between flight lines.
20110611-20111012
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.
20110611-20111212
Manual classification of any data which appears to be properly classified using the automated methods.
20111212-20120415
Create point cloud data, by tile in LAS 1.2 format with absolute GPS timestamps
20121120
0
State Plane Coordinate System 1983
5004
0.999900
-150.0
54.0
1640416.7
0.0
coordinate pair
0.01
0.01
U.S. Survey Feet
North American Datum of 1983(CORS96) EPOCH 2003.0000
Geodetic Reference System 80
6378137.000000
298.257222
NAVD88, derived using GEOID09 (Alaska)
0.01
feet
Explicit elevation coordinate included with horizontal coordinates
LAS
'LAS 1.2' ASPRS binary data
American Society for Photogrammetry and Remote
Sensing
Aerometric, Inc.
Lidar Manager
Lidar Manager
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
Aerometric, Inc. assumes no liability for the data
being used for purposes other than stated in this document.
200120627
Aerometric, Inc.
Lidar Manager
Lidar Manager
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
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time