Data Collected : 06/18/21
Desired output for LAS/LAZ: WGS84 UTM 14 North Meters
: WGS84 UTM 14 North Meters
The World Geodetic System 1984 (WGS84) has been revised six times since its original realization in 1987.
The most recent version is WGS84 (G2139) implemented on 3 January 2021 and aligned to the International GNSS Service (IGS) realization of the International Terrestrial Reference Frame 2014 (ITRF2014), known as IGb14.
WGS84 (G2139) will replace (G1762), however, it is not currently available. Until it is, G1762 should be selected.
The WGS84 reference frame is realized globally through the coordinates of 17 DoD monitoring stations distributed across the world.
WGS84 is a dynamic reference frame.
At the beginning of each year, the National Geospatial-Intelligence Agency (NGA) update station coordinates of the 17 sites.
The coordinates are adjusted to an epoch at the half year mark to account for plate tectonic motion.
This means that WGS84 coordinates derived by users from GPS measurements will appear to move over time.
WGS84 =
(G1762) =
2021.46 = Date of acquisition =
UTM 14 North =
Meters = Units
LiDARMill does not require the user input of the epoch when RTX refined reference station coordinates are utilized, because it extracts the epoch from the RTX report.
Next, select the Horizontal coordinate system "WGS84/UTM zone 14N" (Datum and Map Projection) and "Ellipsoidal" as the vertical geodetic coordinate system (WGS84(G1762) will be automatically selected for vertical CRS)
LiDARMill may prompt the user to select the output coordinate system within the Spatial Fuser Pipeline. If it does not prompt the user, the Project CRS will be used.
In Inertial Explorer, select the datum "ITRF2014" during the tightly coupled trajectory processing step
: WGS84 (G1762)
WGS84 is a vertical datum and does not require the user to select a geoid model.
During , select "WGS84 (G1762)" as the project datum and select "Metre" for the project units.
The project CRS should match the . You can verify the GCP CRS by clicking on the "GCP" tab within LiDARMill, and then clicking the button to the right of the GCP artifact, then click "Edit artifact"
In of a Navlab Pipeline, select the ITRF2014 refined trajectory. Navlab will automatically specify the epoch (derived from the RTX report).
In of a Navlab Pipeline, select the output datum as ITRF 2014
PLP in SpatialExplorer, and click on the datum at the upper right to configure the datum as WGS84(G1762) and click "Pick date..." to select the date of the LiDAR acquisition.
When into Spatial Explorer, Select the Horizontal CRS as "WGS 84 / UTM zone 14N" with units set to "metre" and select the Vertical CRS as "WGS84(G1762)" with units set to "metre".
During trajectory processing in Inertial explorer, as "ITRF2014" and the epoch as the project datum epoch when the LiDAR data was collected - "2021.463" in this example.
In Inertial Explorer, select the datum "ITRF2014" during the step
When into SpatialExplorer, the trajectory epoch will be the same as the project epoch - "2021.463" in this example.
When, select the Horizontal CRS as "WGS84 / UTM zone 14N" with units set to "metre" and select the Vertical CRS as "WGS84(G1762)" with units set to "metre". Click "Pick date..." to specify the epoch as the date of LiDAR acquisition, and matching the project epoch.
