Raster Dataset
Tags
LiDAR, Manitoba, Canada
Data set represents ground features. Bare earth DEM files were created from calibrated and classified las data. This 1 meter grid raster product was extracted from a TIN that was created from the ground class (2) of the las data.
The project area is 396 tiles (1500 x 1500 meters) covering approximately 800 square kilometers in the area designated as Catfish Creek, located northeast of Winnipeg in Manitoba, Canada. The project design of the lidar data acquisition was developed to support a nominal post spacing of 1.0 meter. ATLIS Geomatics Inc. acquired 79 flight lines in 5 lifts from May 9, 2012 through May 12, 2012. Lidar data collection was performed with a Cessna C206 aircraft, utilizing a Optech Gemini sensor, collecting multiple return x, y, and z data as well as intensity data. Lidar data is remotely sensed high-resolution elevation data collected by an airborne collection platform. Sensor collection parameters are as follows. Fligh Altitude: 1550 m AGL Air Speed: 130kts Average NPS: 1.14 m Scan Half Angle: 24 deg Scan Frequency: 29 Hz Swath Width: 1380 m Overlap: 30% PRF: 70 kHz.
ATLIS Geomatics Inc. 1333 Dugald Road Winnipeg, MB, Canada 913.981.9600
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Extent
West | -96.542402 | East | -96.036695 |
North | 50.656029 | South | 50.294371 |
Maximum (zoomed in) | 1:5,000 |
Minimum (zoomed out) | 1:150,000,000 |
ATLIS Geomatics Inc. 1333 Dugald Road Winnipeg, MB, Canada 913.981.9600
ground condition
Compliance with the accuracy standard was ensured by the collection of GPS ground control during the acquisition of aerial lidar and the establishment of a GPS base station operation airport. The following checks were performed. 1. The ground control and airborne GPS data stream were validated through a fully analytical boresight adjustment. 2. The Lidar elevation data were checked against the project control. 3. Lidar elevation data was validated through an inspection of edge matching and visual inspection for quality (artifact removal).
The following methods are used to assure lidar accuracy. 1. Use of IMU and ground control network utilizing GPS techniques. 2. Use of airborne GPS in conjunction with the acquisition of lidar.
The minimum expected horizontal accuracy was tested during the boresight process to meet or exceed the National Standard for Spatial Data Accuracy (NSSDA). Horizontal accuracy is 75 centimeter RMSE or better.
Vertical Accuracy RMSE(z) 0.061 meter
Once all lifts are completed with Boresight adjustment individually, technician shall check and correct the vertical mis-alignment of all flight lines and also the matching between data and ground truth. This process includes calculating the zbias value for each flight line so that all flight lines are aligned vertically and the entire data set match to the ground control points within the project specified accuracy range. The technician will run a final vertical accuracy check against the control after the z correction. The result will be analyzed against the project specified accuracy to make sure it meets the requirement. 9028 control points were measured with a resulting 0.061 meter RMSE(z).
1. Lidar, GPS, and IMU data was processed together using Applanix POSPac processing software. 2. Lidar data was transformed to the specified project coordinate system when imported into GeoCue software. 3. The lidar data set for each flight was checked for project area coverage and lidar post spacing was checked to ensure it meets project specifications. 4. The lidar collected at the project area was processed using Terrasolid products to correct the rotational, atmospheric, and vertical elevation differences that are inherent to lidar data. 5. Each lift was compared with all neighbors that contained overlapping areas to ensure calibration consistent across the AOI. 6. By utilizing the ground survey data collected at the project area, the lidar data was vertically biased to the ground. 7. Comparisons between the biased lidar data and ground survey data within the project area were evaluated and a final RMSE value was generated to ensure the data meets project specifications.
Ground control was acquired by Atlis Geomatics.
ground condition
Optech Gemini sensor 1-meter post spacing LAS 1.2 format
see process steps